Clarke Focus Ii Large Walk Behind Floor Scrubber Service Manual

2018-06-21

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Cla rke Foc us I I La rge

Se r vic e M a nua l
Cla rke M ode ls: 5 6 3 8 1 7 9 6 (Foc us I I D-C AU S), 5 6 3 8 1 8 2 5 (Foc us I I D), 5 6 3 8 1 8 2 8
(Foc us I I D-C)

6/12 revised 11/13 FORM NO. 56043162

Table of Contents

Ta ble of Cont e nt s
Introducion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Nameplate
5
Other Manuals Available For Your Machine
5
Convenions
5
Transporing the Machine
5
Cauions and Warnings
6
Symbols
General Safety Instrucions

Technical Speciicaions
Maintenance Schedule

Bateries and Chargers
Lubricaing the Machine

6
7

8
10
10
10

PM Checklist
11
Know Your Machine
12
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Funcional Descripion
16
Descripion of Indicators
17
Scrub Mode Indicators
Batery Indicator

Main Controller
Main Control Board Programming

Displaying the Control Board Revision Level
Recall of Stored Error Codes
Turning Fault Detecion On or Of:
Low-voltage Cutout Threshold
Scrub Deck Down Time Period Adjustment
Scrub Deck Pressure, Soluion Flow Rate, and Chemical Flow Rate Adjustments
Restoring the Scrub Pressures to Factory Default Seings
Regular Scrub Seing Adjustment
Heavy Scrub Seing Adjustment:
Extreme Scrub Seing Adjustment

Troubleshooing Guide

Main Controller Error Codes
Main Controller I/O Table
Service Test Mode
Test Mode Input Indicators
Batery Voltage
Speed Controller Status
Forward/Reverse Status
Reverse Status
Test Mode Output Controls
Descripion of Output Controls

18
18

19
19
20
20
20
21
22
23
23
23
24
24

25
25
27
28
28
28
28
28
28
29
29

Soluion System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Funcional Overview
32
Circuit Overview
33
Electrical Diagram

Maintenance
Troubleshooing Guide
Electrical Troubleshooing
ii - 56043162 - Focus II Large

34
34
34

Table of Contents
Removal and Installaion

Solenoid Valve Removal
Solenoid Valve Disassembly and Cleaning
Soluion Filter and Ball Valve Removal

35
35
35
36

Scrub System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Funcional Overview
37
M2/M3 - Scrub Brush Motor Run Funcion
M5 - Scrub Brush Actuator Lit Motor Funcion
Scrub System Low-voltage Cut-out Funcion
Electrical Diagram

Removal and Installaion

37
37
37
38

Motor Gimbal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Scrub Brush Deck
40
Scrub Brush lit Actuator
41
Scrub Brush Motor/Gearbox
42

Recovery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Funcional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Vacuum Motor Control Circuit Overview (Auto Mode)

Maintenance

Service Maintenance Checklist
Troubleshooing Guide
Maintenance of the Recovery Tank Float Switch
Maintenance of Vacuum Motor Inlet Screen

Removal and Installaion

Vacuum Motor Removal
Recovery Tank Removal

45
45
45
46
47

48
48
49

Squeegee System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Maintenance
50

Squeegee Lit Linkage Adjustment
50
Servicing the Squeegee
51
Adjusing the Squeegee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Removal and Installaion

Squeegee Mount Assembly Removal
Caster Wheel Removal

52
52
53

Wheel Drive System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Funcional Overview
54
Drive Motor System Funcion
Electrical Diagram
A2 Speed Controller Pin Key Detail

Wheel Drive Troubleshooing guide
Removal and Installaion

Drive Motor Transaxle Removal
Drive Motor Transaxle Removal (coninued)
Drive Wheel Removal
Tesing the Palm Drive Butons
Palm Drive Buton Replacement
Tesing the Reverse Buton
Reverse Buton Replacement
Tesing the Speed Limit Control Poteniometer
Speed Limit Control Poteniometer Replacement

iii - 56043162 - Focus II Large

54
55
56

57
58
58
59
60
61
62
63
64
65
65

Table of Contents
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Wiring (Ladder) Diagram
67
Wiring Harness Diagram 56315926 Rev. C
68
Bateries
69
Descripion of the Low Voltage Cut-Out Feature
Descripion Of The Batery Condiion Indicators
Speciic Wet Cell Batery Informaion

Batery Maintenance

Charging Bateries
Extending Batery Life
Removal and Installaion
Batery Tesing

Maintenance and Adjustment

Lit Actuator Limit Adjustment

Curis Controller Diagnosics

Funcion of the Speed Controller Status Light and Display
Diagnosics Using the Curis Handheld Programmer
Fault History
Drive Status LED Fault Codes

Speed Control Programming Opions

Installaion Checkout for the Curis Speed Controller
Programming Vehicle Speed Changes
Maintenance

iv - 56043162 - Focus II Large

69
69

70
70
70
71
71

72
72

74
74
74
74
75

76
76
76
76

Introduction

Introduction
This manual will help you get the most from your Clarke Focus II Large Autoscrubber. Read it thoroughly
before servicing the machine
Note: Bold numbers and letters in parentheses indicate illustrated items
Note: All references to right, left, front, or rear in this manual are as seen from the operator’s standpoint

Nameplate
The Model Number and Serial Number of your machine are shown on the Nameplate on the machine This
information is needed when ordering repair parts for the machine Use the space below to note the Model Number
and Serial Number of your machine for future reference
MODEL NUMBER ________________________________________
SERIAL NUMBER ________________________________________

Other Manuals Available For Your Machine
The following manuals are available at Clarke Literature Service Department:
• Instructions for Use (English/Español/Francais) – Form Number 56091028
• Parts List – Form Number 56042584

Conventions
Forward, backward, front, rear, left or right are intended with reference to the operator’s position, that is to say in
operating position with the hands on the handlebar

Transporting the Machine
Caution! Before transporting the machine on an open truck or trailer, make sure that
• The machine is tied down securely.
• All access doors and covers are secured (tape and strap as needed).
Caution! If the machine must be towed or pushed, make sure the Master On/Off Key Switch
(A) is in the OFF position and do not move the machine faster than a normal walking
pace (2-3 mph, 3-5kph) and for short distances only. Note: Disconnecting the wheel
drive motor wiring connector will make a disabled machine easier to push.

5 - FORM NO. 56043162 - Focus II Large

Introduction

Cautions and Warnings
Symbols
It is important for you to read and understand this manual The information it contains relates to protecting your
safety and preventing problems The symbols below are used to help you recognize this information
Danger!

Indicates a potentially hazardous situation which, if not avoided, will result in
death or serious injury.

Warning! Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
Caution! Indicates a potentially hazardous situation which, if not avoided, could result in
minor or moderate injury.
Caution! When used without the Safety Alert Symbol, indicates a potential situation which,
if not avoided, could result in property or machine damage.

6 - FORM NO. 56043162 - Focus II Large

Introduction

General Safety Instructions
Warning!
◦ This machine should be used only by properly trained and authorized persons
◦ Never work under a machine without safety blocks or stands to support the machine
◦ Keep sparks, lame and smoking materials away from batteries. Explosive gases are vented
during normal operation
◦ Charging the batteries produces highly explosive hydrogen gas. Charge batteries only in wellventilated areas away from open lame. Do not smoke while charging the batteries.
◦ Remove all jewelry when working near electrical components
◦ Do not dispense lammable cleaning agents, operate the machine on or near these agents, or
operate in areas where lammable liquids exist.
Caution!:
◦ When operating this machine, ensure that third parties, particularly children, are not
endangered
◦ Turn the key switch off (O) and disconnect the batteries before servicing electrical components
◦ Turn the key switch off (O) and remove the key, before changing the brushes, and before
opening any access panels
◦ This machine is not suitable for picking up hazardous dust
◦ Do not use on surfaces having a gradient exceeding that marked on the machine.
◦ While on ramps or inclines, avoid sudden stops when loaded Avoid abrupt sharp turns Use low
speed down hills Clean only while ascending (driving up) the ramp
◦ Before performing any service function, carefully read all instructions pertaining to that
function
◦ Do not leave the machine unattended without irst turning the key switch off (O), removing the
key and securing the machine
◦ Take precautions to prevent hair, jewelry, or loose clothing from becoming caught in moving
parts
◦ Only use the brushes provided with the appliance or those speciied in the instruction manual.
The use of other brushes may impair safety
◦ Refer to the battery charger OEM product manual for additional speciic battery charger
warnings
Caution!:
◦ This machine is not approved for use on public paths or roads
◦ Use care when using abrasive brushes, scariier discs, or grinding stones. Advance will not be
held responsible for any damage to loor surfaces.
◦ Turn the key switch off (O) and remove the key, before changing the brushes, and before
opening any access panels
◦ Use caution when moving this machine in below freezing temperature conditions Any water
in the solution, recovery or detergent tanks or in the hose lines could freeze, causing damage to
valves and ittings. Flush with windshield washer luid.
◦ The batteries must be removed from the machine before the machine is scrapped The disposal
of the batteries should be safely done in accordance with your local environmental regulations
◦ Do not clean this machine with a pressure washer
◦ All doors and covers are to be positioned as indicated in the instruction manual before using the
machine

7 - FORM NO. 56043162 - Focus II Large

Introduction

Technical Specifications
Voltage

36-Volt

Power Source

(6) 6-volt Batteries (wet acid and gel cell available)

Battery Capacity

305 amp-hrs.

Protection Grade

IPX3

Onboard Battery Charger

36-volt, 25-amp Wet/Gel Compatible

Solution Control

Pulse-control gravity feed

Solution Tank

30 gal. (114 L)

Recovery Tank

30 gal. (114 L)

Scrub Motors

(2) 0.75 HP (560-watt)

Vacuum Motor

0.75 HP (560-watt) three-stage

Sound Pressure Level (IEC 60704-1)

74.5 dB(A)/20µPa

Drive System

0.5 HP (375-watt) variable forward and reverse; max. speed = 3 mph (4.83 km/hr)

Drive Wheels

(2) 13-inch (33 cm) diameter; foam-illed; black non-marking

Scrub Head Type

Disc

Scrub Path

34 inches (86 cm)

Gradeability

Transport

2% (1.15º)

Cleaning

2% (1.15º)

Max. Productivity @ 3.0 mph

44,880 ft2/hr (4,169 m2/hr)

Max. Productivity @ 1.5 mph

22,440 ft2/hr (2,085 m2/hr)

Scrub Head Size and Type

(2) 17 in,(43 cm) Brushes or Pad Holders

Scrub
Pressure

(1) Regular Scrub

Max. 90 lbs (40.8 kg)

(2) Heavy Scrub

Max. 175 lbs (79.4 kg)

(3) Extreme Scrub

Max. 250 lbs (113.4 kg)

Scrub Head Speed
Solution
Flow Rate

220 RPM
(1) Regular Scrub

0.30 gal/min (1.1 L/min) or 100 minutes per solution tank

(2) Heavy Scrub

0.60 gal/min (2.3 L/min) or 50 minutes per solution tank

(3) Extreme Scrub

0.90 gal/min (3.4 L/min) or 33 minutes per solution tank

Dimensions (w/o Squeegee)

W = 35.5 in (90 cm); L = 62.5 in (159 cm); H = 45 in (114 cm)

Gross Weight w/Standard Batteries

1,245 lbs (565 kg)

Battery Compartment Size

See Illustration below; W = 25.5 in (65 cm), L = 29.5 in (75 cm), H = 15 in (38 cm)

14.5"

41.9 in (106 cm)

25.5"

Squeegee Width

15"
29.5"
8 - FORM NO. 56043162 - Focus II Large

Introduction

Technical Specifications (continued)

9 - FORM NO. 56043162 - Focus II Large

Introduction

Maintenance Schedule
Maintenance intervals given are for average operating conditions Machines used in severe operational
environments may require service more often.
MAINTENANCE ITEM
Charge the Batteries
Check/Clean Tanks and Hoses (clean recovery tank switch and vacuum inlet screen)
Check/Clean/Rotate the Brushes/Pads
Check/Clean the Squeegee
Check the Water Level in each Battery Cell (does not apply to gel cell batteries)
Inspect the Brush Housings
Inspect and Clean the Solution Filter
Lubricate the Machine
* Check the Carbon Brushes

Daily
X
X
X
X

Weekly Monthly Yearly

X
X
X
X
X

Note: See the individual machine system sections in this manual for maintenance information
Warning! Turn the key switch off and disconnect the batteries before servicing the
machine.
* Carbon brush inspection intervals and replacement recommendations:
• Check the vacuum motor carbon brushes (two per motor) once a year or after 300 operating hours
• Check the carbon brushes on the brush and wheel drive motors (four per motor) once a year or after 500 operating
hours
• The original (new) length of each carbon brush is 1” (25.4mm) on all 36-volt machine models brush and wheel
drive motors
• All motors: Replace carbon brushes when shorter than 3/8” (9.5mm) to obtain the same motor eficiency as new
brushes
Important! Motor damage resulting from failure to service the carbon brushes is not

covered under warranty See the Limited Warranty Statement

Batteries and Chargers
Attention: See the Electrical System/Batteries
section in this manual for battery installation,
battery maintenance and charger system
requirements.

Lubricating the Machine
Once a month, apply light machine oil to lubricate
the:
• General pivot points for the squeegee linkage
(A)
• Threads on the squeegee angle adjustment
knob (B)
• Squeegee tool end wheels (C)
• General pivot points for the brush linkage (D)
Once per quarter, grease the zerk itting on each
of the two caster swivels (E)

10 - FORM NO. 56043162 - Focus II Large

Advance 34 RST Models
PM Checklist
Customer

A
B
C
D
L
M
W

Address
City

Model

Zip

Serial No.

Hours

OPERATIONAL INSPECTION ITEMS
Ref
1
2
3
4
5
6
7
8
9

Palm Drive Button and Reverse Button Operation (check for Fwd/Rev Drive)
Drive System Performance (Speed Changes Min/Max)
Scrub System (Raise/Lower, Brush Motor On/Off)
Scrub Brush Pressure settings (1-3)
Squeegee System (Raise/Lower and Squeegee Tool pick-up Performance)
Vacuum Performance (Sealed water lift and 1” open hole adapter, 36v-68/12)
Solution Control (Auto On/Off and Flow Volume settings 1, 2 and 3
Battery Charger (Auto turn ON and OFF)
Main Controller Special Program Options (see Electrical System/Main Control
Programming Options). Check all applicable machine settings. Examples: Scrub
mode pressure settings, service test mode, low voltage cut-out, etc.

VISUAL INSPECTION ITEMS

Defect Codes
needs adjustment
binding
dirty or contaminated
damaged, bent or torn
leaks
missing
worn out

Defect Codes
(circle)
B D W
noisy sluggish
A B D
A B
A B D
C L W
A B L
D
A

Defect Codes
(circle)
D M W
B C W
B D L
C D M
D M W
C L W
C L
B C W
C D M
L M W
C D L
C D L
A D W
A D W

Ref
10
11
12
13
14
15
16
17
18
19
20
21
22
23

Does
Not
Work

Comments
OK
Scrub Brushes, check for wear and rotate
500 Hours
Scrub Brush Motor(S), check for carbon brush wear
Scrub Brush Motor(S), check gearboxes
Brush Drive Motor Gimbals
Scrub Deck Lift Motor, Brush Housings and Side Wheel
Solution Solenoid Valve
Solution Tank, Delivery Hoses and Filter
clean ilter screen
Vacuum Motor Carbon Brushes (wear limit 3/8” [9.5 mm])
300 Hours
Vacuum Motor Inlet Filter (located in recovery tank)
clean screen
Recovery Tank Cover Gasket
Recovery Tank Drain Hose and Cap
Squeegee Pick-up Hose
back lush
Squeegee Tool and Blades (clean, rotate and adjust)
Squeegee Tool End Wheels and Squeegee Mount Wheels
2 mount wheels
(lubricate)
and 2 end wheels
24 Battery Condition (load test, clean and water)
C W
25 Drive Wheel Transaxle Motor Check Carbon Brushes
500 Hours
B C D W
26 Transaxle Drive Tires
tread wear
W
27 Rear chassis Caster Wheel (grease the zerks)
tread wear
W
Note: For additional service information, see the individual machine system sections and the Instructions for Use, form #56041706.
WORK COMPLETED BY:
ACKNOWLEDGED BY:

Service Technician Signature

Date

Customer Signature

Date

Introduction

Know Your Machine
As you read this manual you will occasionally run across a bold number or letter in parentheses - example: (2).
These numbers refer to items shown on the following pages unless otherwise noted Refer to these pages for the
location of items highlighted in bold in the text.
1
2
3
4
5
6
7
8

Solution Tank Fill
Operator Control Handle
Bottle Holders
Vacuum Motor Inlet Screen
Recovery Tank Cover
Nose Cone
Scrub Deck
Brush Housings (includes Bristle Skirt)

12 - FORM NO. 56043162 - Focus II Large

9
10
11
12
13
14
15
16

Scrub Deck Bumper Wheel
Drive Wheel
Solution Filter
Solution Shutoff Valve
Squeegee Assembly
Battery Pack Connector (onboard charger models only)
Onboard Battery Charger (not found on all models)
Solution Drain Hose/Level Indicator

Introduction

16
17
18
19
20
21
22
23
24

Solution Drain Hose/Level Indicator
Squeegee Raise/Lower Lever
Battery Pack Connector (non onboard charger models only)
Recovery Hose
Wheel Drive Circuit Breaker
Circuit Breaker for the Control Circuit
Squeegee Blade Tension Strap
Squeegee Blade Latch
Squeegee Blade Alignment Pins

13 - FORM NO. 56043162 - Focus II Large

25
26
27
28
29
30
31
32

Squeegee Mount Thumb Nut
Squeegee Adjustment Knob
Recovery Tank Drain Hose
Reverse Button
Palm Drive Buttons
Speed Limit Control Knob
Control Panel
Vacuum Shutoff Switch

Introduction

A1
A2
BT1
F1
F2
F3
K1
K2
L1
M1
M2

Control Panel Assy
Speed Control
Battery (Not Shown)
Fuse, 150 Amp
Circuit Breaker, 5 Amp
Circuit Breaker, 30 Amp
Contactor, Brush Motor
Contactor, Vac Motor
Solenoid, Solution
Motor, Wheel Drive
Motor, Left Brush

14 - FORM NO. 56043162 - Focus II Large

M3
M4
M5
R1
S3
S4
S5
S6
S7
X9
X10

Motor, Right Brush
Motor, Vac
Motor, Brush Actuator
Potentiometer, 100K Ohm, Speed Limit
Switch, Key
Switch, Float (Recovery Tank Full)
Switch, Reverse
Switch, Palm Assy
Switch, Palm Assy
Battery Disconnect
Battery Disconnect

Control Panel

Control Panel
A
B

C
H

Key Switch (Main Power)
Solution Switch
B1 Solution Indicator
D1 Solution Flow Indicator
Vacuum Switch
C1 Vacuum System Indicator
Scrub OFF Switch
H1 Scrub OFF Indicator

I-

Scrub ON Switch
I1 – Regular Scrub ON Indicator
I2 – Heavy Scrub ON Indicator
I1 and I2 – Extreme Scrub ON Indicators
Display
J1 Battery Indicator
J2 Hour Meter / Scrub Pressure Indicator / Fault Code
Display / Recovery Tank FULL Indicator

Extreme
Scrub
Pressure

Heavy
Scrub
Pressure

Regular
Scrub
Pressure

High
Solution
Flow

Medium
Solution
Flow

Low
Solution
Flow

J
J1

C1
C
D1
B1
B
H1
H

15 - FORM NO. 56043162 - Focus II Large

Control Panel

Functional Description
The control panel is an integral component with the Main controller (A1) circuit board The controls on the 34 RST
were designed with one touch operation in mind. For single-pass scrubbing the user can simply depress one switch
and all systems on the machine will be ready to go. For most single-pass scrubbing operations, the operator should
only need to use the middle switches on the control panel These are the Scrub System OFF and Scrub System ON
switches
Key Switch (A): The key switch serves as a main control switch to enable or disable operation of the machine
The key is removable to prevent unwanted operation when not in use The key switch doesn’t disconnect any power
circuits, but instead, sends a signal to both the Main controller and Curtis Drive controller to indicate the On/Off
function
Solution Switch (B) - This switch is used to turn the solution system on or off and select the solution low rate.
Pressing this switch when the scrub system has been activated will increment the solution low rate as displayed
on the Solution Flow Indicator (D1). The solution low will turn on when a Palm Drive Button (29) is pressed
with the Reverse Button released (the forward drive position). The solution low will turn off if both Palm Drive
Buttons (29) are released Pressing the Solution Switch (B) when the scrub system is off will momentarily turn
the solution low on (at the high low rate) to allow pre-wetting of the scrub brushes. Pressing and holding in the
Solution Switch (B) when the scrub system is off will allow continuous solution low for as long as the switch is
depressed
Scrub OFF Switch (H) - Pressing this switch when the unit is in a scrub mode will cause the following to occur:
• The scrub brushes will turn off and the scrub deck will be raised to the up position
• The solution low will be stopped.
• The irst time that this switch is pressed, the vacuum system will NOT be turned off. This is so that any
remaining water may be picked up without having to turn the vacuum back on If this switch is pressed a second
time or if the machine is stopped (after the scrub system has been turned off), the vacuum will shut off after a 10second delay
Scrub ON Switch (I) – If the scrub system is off, pressing this switch once will cause the following to occur:
• The scrub system will be enabled with the scrub pressure set to the “Regular” (“Normal”) mode (#1) and the scrub
deck will be lowered. Note that pressing the Scrub-ON switch twice will set the scrub pressure to the “Heavy”
scrub pressure mode (#2). Pressing and holding the Scrub-ON switch in for ive seconds will set the scrub
pressure to the “Extreme” scrub mode (#3).
• The vacuum system will be enabled
• The solution system will be enabled
• As soon as either of the Palm Drive Buttons (29) is pressed, the scrub brushes will start turning and the
vacuum will turn on. If the direction is set to forward, the solution low will start. If the Reverse Button (28)
is pressed, the solution low will be stopped. If the scrub system is already enabled when the Scrub ON Switch is
pressed, the scrub pressure will increase to the “Heavy” scrub mode (#2). If the Scrub ON Switch is pressed and
held in for 3 to 5 seconds, the scrub pressure will change to the “Extreme” scrub mode (#3). Note that the Scrub
Pressure Indicator (J2) on the panel display will show the current scrub pressure setting (1, 2 or 3)
Note: Both the scrub pressure and the solution low rate will return to their default settings when the key switch is
turned on again after the machine has been switched off.
Vacuum Switch (C) – This switch is used to turn the vacuum system on or off Pressing this switch will alternate
between on and off The vacuum will only turn on when a Palm Drive Button (29) is pressed It will remain on
for 10 seconds after the Palm Drive Buttons (29) are released
The vacuum also has an automatic shutoff feature that will turn the vacuum and scrub systems off if the recovery tank becomes full.
Wand Switch (E): This switch is used when an external vacuum/scrub wand is used. Pressing this switch will
turn the vacuum on continuously without regard to the throttle position If the scrub system was on it will be turned
off. This includes turning off the scrub brushes and turning the solution low off (to the scrub deck). Note: automatic
shutoff of the vacuum motor when the recovery tank is full is disabled when the wand is enabled.

16 - FORM NO. 56043162 - Focus II Large

Control Panel

Description of Indicators
Each of the switches on the control panel have an indicator LED adjacent to the switch Most LEDs are dual
channel and provide two colors within the same LED In general, the following guidelines apply to the control panel
indicators, and various exceptions to this rule are listed separately:
• A steady green indicator means that the particular system or function is on
• A lashing green indicator means that the particular system is in a delayed-off condition. An example of this is
when a scrub mode is selected and the throttle goes from forward or reverse to neutral When this happens the
vacuum indicator will lash green indicating that the vacuum is still on but that it will be turning off after the
delay period
• A steady yellow indicator means that the particular function has been enabled and in a ready state, but is not
currently on. For example, if a scrub mode is selected and the throttle is in neutral, the scrub system, vacuum,
and solution indicators will all be yellow indicating that the systems are enabled and ready to turn on when the
throttle is moved to forward and/or reverse
• A lashing yellow indicator means that a fault has occurred in the particular system. An example of this would
be an over-current fault on one of the motors.
Solution System (B) Indicator:
• This indicator will be off if the solution is disabled and turned off
• This indicator will be green if the solution is on
• This indicator will be yellow if the solution is enabled but the drive paddle is in neutral
• This indicator will lash yellow if there is a solution system fault.
Scrub ON Indicators (I1 & I2):
• For Regular scrub mode, the (I1) LED will be active
• For Heavy scrub mode, the (I2) LED will be active
• For Extreme scrub mode, both (I1&I2) LED’s will be active
• When a scrub mode (regular, heavy, or extreme) is active and the drive paddle is in
the neutral position, the LED’s (I1 and/or I2) will be solid yellow
• When a scrub mode (regular, heavy, or extreme) is active and the drive paddle is in
the drive position, the LED’s (I1 and/or I2) will be solid green
• Both indicators will be off if the scrub system has been turned off

Scrub OFF Indicator (H1):
• This indicator has green and red colors
• The indicator will be green if the scrub system is off and ready to be activated
• The indicator will be red if the scrub system has been turned off and the scrub deck is not up yet
• The indicator will lash red if there is a fault in the scrub system.
• The indicator will be off if the scrub system has been activated
Vacuum System (C) Indicator:
• This indicator will be off if the vacuum is disabled and turned off
• This indicator will be green if the vacuum is on
• This indicator will lash green if the vacuum is in the 10 second delayed-off condition.
• This indicator will be yellow if the vacuum is enabled but the drive pedal is in neutral
• This indicator will lash yellow if there is a vacuum system fault.
Wand Switch (E) Indicator:
• This indicator uses green color only
• This indicator will be green if the Wand Switch has been turned ON
• This indicator will be off if the Wand Switch has been turned OFF
• This indicator is also the Status LED indicator, and will lash green with an error code from the
Curtis Drive controller (See the Wheel System, Traction chapter for details)

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Control Panel

Scrub Mode Indicators
The Solution system and Scrub system have three scrub modes
(regular, heavy, and extreme). These scrub modes are jointly
controlled when the Scrub On Switch (I) is pressed, but the
Solution system can be controlled separately by pressing the
Solution Switch (B)
• Pressing the Scrub On Switch (I) once will set both the scrub
mode and solution mode to regular (and clear any solution
system overrides)

B
Extreme
Heavy
Regular

• Pressing the Scrub On Switch (I) twice will set both the scrub
mode and solution mode to heavy (and clear any solution system
overrides)

• Pressing the Scrub On Switch (I) for 5 seconds will set both
the scrub mode and solution mode to extreme (and clear any
solution system overrides)

• Pressing the Solution Switch (B) once, twice, or for 5 seconds;
will change the solution mode accordingly, but without changing
the scrub mode

The solution mode is displayed in a bar graph adjacent to the solution switch (B), and the scrub mode is indicated in
the display (J2) with a number representing the mode
(1 = regular, 2 = heavy, 3 = extreme).

Battery Indicator
The charge state of the battery is shown in the main display area of the control
panel This is is indicated by three colored LED’s (J1)

Hour Meter: The (J2) display will lash through the total number of run hours
on the machine. The run hours will be displayed sequentially when the key
switch is irst turned on provided the recovery tank is not full and there is no
fault condition to generate a fault code number. For example, a sequential display of “1-3-5-.-6” indicates that there
are 135 6 total hours on the machine

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Control Panel

Main Controller
The Main controller (A1), which includes the control board
and the display, is the primary electronic control for the
machine and its functions (except drive control). The control
board is the basic input/output device and contains a microcontoller chip to regulate function The controller receives and
interprets user inputs, sensor inputs, and even some motor
amperage readings, and controls device output for the user
display, solenoid operation, and motor control Most low and
medium power outputs are controlled with power MOSFET
transistors, with some moderately high power devices
controlled with micro-relays, and very high power devices
(vacuum and brush motors) controlled with external motor
contactors
Another function of the main controller is to detect any system failures and display an error code on the display
panel or store it in the main control board’s memory The error code(s) are used to help the service person determine
the fault and to quickly guide in repairing a speciic system malfunction. Note: See the Troubleshooting Guide for
further information An additional special feature of the main control board is to change program settings for a set of
speciic machine functions. See the Main Control Board Programing section in this chapter for further information

Main Control Board Programming
The Main controller is programmable for machine speciic functions and parameters. This is a required task when
replacing the controller with a new controller The table below and following sections describe the parameters to be
programmed
Button(s) to Hold While Turning Key
Switch to On

Programming Option
Enter Service Test Mode

Vacuum Switch (C)

Low-voltage Cut-out Threshold

Scrub OFF Switch (H)

Enable/Disable Fault Detection

Scrub OFF Switch (H)
Solution Switch (B)

Recall/Clear Stored Error Codes

Solution Switch (B)

Controller Software Revision
Level

Solution Switch (B) Vacuum Switch (C)

Scrub Deck Down Time

Scrub OFF Switch (H)
Vacuum Switch (C)

Regular Scrub Setting

Scrub OFF Switch (H)
Scrub ON Switch (I)

Heavy Scrub Setting

Scrub ON Switch (I)
Vacuum Switch (C)

Extreme Scrub Setting

Scrub ON Switch (I)
Solution Switch (B)

Restore Factory Default Scrub Settings Scrub ON Switch (I)
Recovery Tank-full Switch Orientation

N/A

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Control Panel

Displaying the Control Board Revision Level
During machine service, it may be helpful to know the control board revision level to determine machine
coniguration. To view the control board revision level:
1

Turn the key switch to the off position

While holding the Solution (B) and Vacuum (C) switches depressed, turn on the key
switch

Hold both switches until Solution and Vacuum indicators turn green.

The LED display will show the revision level (letter) of the controller software

To exit the revision level recall mode, turn the key switch to the off position.

Recall of Stored Error Codes
To assist with service troubleshooting, the controller maintains a list of past error codes To recall and/or clear the
stored error codes perform the following steps:
1

Turn the key switch to the off position

While holding the Solution Switch (B) depressed, turn the key switch to the on position

Continue to hold the solution switch until the solution indicator turns green
• If there are no error codes stored, the display will show “—”

• If any error codes are stored, the scrub off indicator will be red and the display will show the error code
number(s). If more than one error code is stored, the display will scroll through the error codes in sequence.
4

To clear the stored codes, press the scrub off switch (It is recommended that error codes are cleared after
servicing so that future error codes represent only errors that occur between service intervals )
• The display will now show “—”

To exit the error code recall mode, turn the key switch to the off position.

Turning Fault Detection On or Off:
If a fault occurs in a particular system, that system (and possibly others) will be shut down This can make
troubleshooting the system dificult. This option will allow service personnel to disable some of the fault detection
checks to facilitate troubleshooting. This will not disable the over-current protection on any of the systems.
Important: Make sure to turn Fault Detection back on before returning the machine to normal operation To turn
the fault checking on or off:
1

Turn the key switch to the off position

While holding the Scrub System Off (H) and the Solution (B) switches depressed, turn
on the key switch

Continue to hold both switches until the indicators for both switches turn green

Release both switches The scrub off indicator will turn red

Pressing the solution switch will toggle between fault detection enabled and disabled

• The LED display will toggle between “E” (enabled) and “d” (disabled)
6

To save the setting, press the scrub off switch
• The scrub off indicator will turn green

Turn the key switch to the off position The new setting will be saved and will remain in effect until it is
changed again

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Control Panel

Low-voltage Cutout Threshold
The 34 RST is equipped with a low-voltage cutout feature to prevent over-discharging the batteries. This feature
will automatically shut down the scrub system when the battery voltage falls to the selected threshold The cutout
threshold has two levels: Standard and Alternate The Standard setting is 30 96 volts (5 16 volts per battery), and is
for standard lead acid batteries The Alternate setting is 32 58 volts (5 43 volts per battery), and is for typical gelled
electrolyte batteries. Select the proper cutout level based on the battery manufacturer’s speciications. Factory
Default: 30 96V (Standard Battery)
To select between the two cutout levels:
1

Turn the key switch (A) to the off position

While holding the Scrub Off switch (H) turn the key switch (A) to the on position

Continue to hold the Scrub Off switch until the Scrub Off indicator (H1) turns green, and then
release the Scrub Off switch
• The Scrub Off indicator will turn red

To toggle between Standard and Alternate, press the Scrub On switch (I) The two modes
are identiied by the following indicators:

H
Alternate

Standard

• The Scrub On Regular (I1) and Heavy (I2) LED’s will toggle green and yellow, as
shown to the right
• The status display will show an “S” (standard) or an “A” (alternate)
5

To save the new setting, press the scrub off switch The scrub off indicator will turn green

Turn the key switch to the off position to commit the settings to permanent memory

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Control Panel

Scrub Deck Down Time Period Adjustment
The initial lowering of the scrub deck is timed, because there will not be any brush motor amperage to monitor for
determining when to stop lowering the deck The time that the deck is lowered is adjustable from 3 5 seconds to 4 4
seconds in 0.1-second increments. The factory default setting is #5, 4.0 seconds. To adjust the scrub deck down time,
perform the following steps:
1

Turn the key switch to the off position

While holding the Scrub Off (H) and the Vacuum (C) switches depressed, turn the key
switch to the on position

Continue to hold both switches until the indicators for both switches turn green

Release both switches. The Regular and Heavy Scrub On indicators will turn yellow
and the Scrub Off indicator will turn red

• The LED display will show the number corresponding to the deck down time as listed in the table shown on
the right
5

Press the Scrub On (I) switch to toggle through the deck down time period values These values represent the
times shown in the table to the right

To save the new setting, press scrub off switch
• The scrub off indicator will turn green

Turn the key switch to the off position to commit the settings to permanent
memory

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Number in
Display

Scrub Deck
Down Time

3.5 sec

3.6 sec

3.7 sec

3.8 sec

3.9 sec

4.0 sec

4.1 sec

4.2 sec

4.3 sec

4.4 sec

Control Panel

Scrub Deck Pressure, Solution Flow Rate, and Chemical Flow Rate Adjustments
Each of the scrub settings (Regular, Heavy, and Extreme) affects the scrub deck pressure and solution low rate.
These settings are adjustable The default values are shown in the tables below The scrub pressures are determined
by examining the amperage through the brush motors.

Scrub Pressure & Amperage Specifications Chart
Default Pressure
Indicator

Brush Motor
Amperage

Regular Scrub

1 bar(#1)

16 AMPS

Heavy Scrub

2 bars(#2)

24 AMPS

Extreme Scrub

3 bars(#3)

38 AMPS

Scrub Mode

Default Solution Flow Rate Chart
Solution Flow Indicator

Flow Rate

One bar gauge(#1)

0.3 g/m

Two bar gauge(#2)

0.6 g/m

Three bar gauge(#3)

0.9 g/m

Restoring the Scrub Pressures to Factory Default Settings
Use this procedure to restore all of the scrub deck pressure settings to their factory default values
1

Turn the key switch to the off position

While holding the Scrub On switch (I) depressed, turn the key switch to the on position
◦ The display will show ”d” to indicate that the factory default scrub pressures have been
restored

Release the switch and turn the key switch to the off position

Regular Scrub Setting Adjustment

Use this procedure to adjust the scrub deck pressure and solution rate that are used for the Regular scrub mode
1

Turn the key switch to the off position

While holding the Scrub On (I) and Scrub Off (H) switches depressed, turn the
key switch to the on position

Continue to hold the both switches until the switch indicators turn green

Release both switches The scrub off indicator will turn red and the regular scrub
indicator will turn yellow Also:
• The LED display will show the level number of the current scrub pressure
setting

Pressing the Scrub On switch (I) will scroll through the 3 scrub pressure settings

Pressing Scrub Off switch (H) will save the pressure setting and move to solution rate setting

Solution Rate Setting: The Regular Scrub indicator (I1) will turn from yellow to green and the
Solution indicator will turn yellow

Press the Solution switch (B) to scroll through the 3 solution rate settings

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Control Panel
9

Press the Scrub Off switch (H) to save the new setting and move to the end of the program mode

10 Turn the key switch to the off position The new settings will be saved and will remain in effect until they are
changed again
Heavy Scrub Setting Adjustment:
Use this procedure to adjust the scrub deck pressure and solution rate that are used for the Heavy scrub mode.
1

Turn the key switch to the off position
a While holding the Scrub On (I) and Vacuum (C) switches depressed, turn the key
switch to the on position
b Continue to hold both switches until the heavy scrub on indicator turns green and
the vacuum indicator light switches on

Release both switches The scrub off indicator will turn red and the heavy scrub indicator (I2) will turn yellow
Also:
• The LED display will show the level number of the current scrub pressure setting

Press the Scrub On switch (I) to scroll through the 3 scrub pressure settings

Press the Scrub Off switch (H) to save the pressure setting and move to solution rate setting

Solution Rate Setting: The Heavy Scrub indicator (I2) will turn from yellow to green and the
Solution indicator will turn yellow

Press the Solution switch (B) to scroll through the 3 solution rate settings

Press the Scrub Off switch (H) to save the new setting and move to the end of the program mode

Turn the key switch to the off position The new settings will be saved and will remain in effect
until they are changed again

Extreme Scrub Setting Adjustment
Use this procedure to adjust the scrub deck pressure, solution rate, and chemical rate that are used for the Extreme
scrub mode
1

Turn the key switch to the off position
a While holding the Scrub On (I) and Solution (B) switches depressed, turn the key
switch to the on position
b Continue to hold the both switches until the Solution, Regular Scrub, and Heavy
Scrub indicators turn green

Release both switches. The scrub off indicator will turn red and the and Regular and Heavy scrub indicators will
turn yellow Also:
• The LED display will show the level number of the current scrub pressure setting

Press the Scrub On switch (I) to scroll through the 3 scrub pressure settings

Press the Scrub Off switch (H) to save the pressure setting and move to solution rate setting

Solution Rate Setting: The Regular Scrub Indicator (I1) and Heavy Scrub indicator (I2) will
turn from yellow to green and the Solution indicator will turn yellow

Press the Solution switch (B) to scroll through the 3 solution rate settings

Press the Scrub Off switch (H) to save the new setting and move to the end of the program mode

Turn the key switch to the off position The new settings will be saved and will remain in effect
until they are changed again

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Control Panel

Troubleshooting Guide
Any error codes detected by the main control board will be displayed on the display
panel as they occur. If more than one error exists the display will sequence through
the error codes at one-second intervals. The hour meter / error display (J2) will
lash an “E” and 2 numbers, one at a time.

When troubleshooting any “Fault Description” noted with a double asterisk (**)
follow the instructions for entering the Service Test Mode in the control board’s
special programs See the Main Control Board Special Program Options section in this manual

Main Controller Error Codes
Error

Description

Comments

E03

Drive system fault.

The Regular Scrub On indicator (i1) will lash out the speciic error
code from the Curtis Drive controller. See the Wheel System,
Traction chapter troubleshooting section for a list of error codes.

E04

Scrub deck lift actuator overload. • Inspect the scrub deck for obstruction.
• Measure the actuator amperage with and without the scrub deck
connected.
• No-load current = 1.4 amps
• Normal current = 1.0-2.5 Amps
• Maximum current = 6 Amps
• If the no-load current remains high, then the actuator or wiring is
faulty.

E06

Scrub motor overload

• Check the scrub setting adjustments described previously in this
chapter.
• Check for binding in rotation of brushes or improper deck lift
actuator operation.
• Inspect the ground wire supplying the brush motors for poor or
corroded connections. The voltage drop across this wire is used to
measure the amperage to the motors.
• Inspect the current sense wire (white/gray) for continuity.

E07

Vacuum motor overload

• Inspect the vacuum motor impeller for obstruction.
• Check the vacuum discharge for obstruction (inlet obstruction will
reduce the amperage).
• Normal current load 17-19 Amps.
• Inspect the vacuum motor brushes
• Defective motor bearings.
• Inspect the current sense wire (orange) for continuity

E08

Solenoid Bank Coil Circuit
Overload
• Brush Motor Contactor (K1)
• Vacuum Motor contactor (K2)
• Solution Solenoid (L1)

The sum of the currents through these coils is too high
• Inspect the “B-3” ground bus (J2-9 wire) at the controller
for negative battery voltage. This error will occur if B-3 is
disconnected.
• If this error occurs when no coils are active (and J2-9 wire is
good), the control board is defective
• Operate various combinations of coils to identify which coil is
causing the problem.
• Check for wiring problems on the coil circuit(s) and repair wiring.
• Check resistance on all contactor/solenoid coils. If the value is less
than 20% of the values below, replace the contactor/solenoid
• Brush motor contactor coil (K1): 98 to 120 Ω
• Vacuum motor contactor coil (K2): 102 to 120 Ω
• Solution solenoid coil (L1): ST 76 Ω

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Control Panel
E017

Scrub deck lift actuator circuit
open (**)

The controller’s internal circuitry is not seeing any voltage change.
• Inspect the B+2 bus (J2-7) and fuse (F2) for positive battery
voltage.
• Check for disconnected actuator wiring or defective actuator
motor.
• Check controller’s actuator output voltage. This is a switched
ground PWM, so one terminal will be 36 volts (B+2 bus) to
Battery-Negative and the other should be non-zero (PWM of B-2)
to Battery-Negative. If both remain near 36 volts, it indicates a
controller failure.

E018

Scrub deck lift actuator short

The controller’s internal circuitry is seeing maximum voltage in the
current sensing circuit.
• Inspect the B-2 bus (J1-9) for connection to ground
• Inspect the actuator wiring for short circuit(s)
• Inspect the scrub deck for obstructions to movement
• Check the lift actuator limit adjustment

E021

Brush motor circuit open (**)

The controller’s internal circuitry is not seeing any voltage change.
• Inspect the current sense wire (white/gray) for continuity.
• Inspect the brush motor contactor for proper operation.
• Inspect the motor power circuit and cable connectors for open
circuits

E022) Scrub motor short

The controller’s internal circuitry is seeing maximum voltage in the
current sensing circuit.
• Same troubleshooting as E06

E023) Vacuum motor circuit open (**)

The controller’s internal circuitry is not seeing any voltage change.
• Inspect the current sense wire (orange) for continuity.
• Check the vacuum motor contactor for proper operation
• Inspect the motor’s power wiring for open circuit

E024) Vacuum motor short

The controller’s internal circuitry is seeing maximum voltage in the
current sensing circuit.
• Same troubleshooting as E07

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Control Panel

Main Controller I/O Table
B- = Battery Negative
Designation Pin

B+ = Battery Positive

Wire Color

Description

Signal
Type

Nominal Reference
Value
To:

Range

Input

J1-4

ORN/BLU

Speed Control Status

VDC

-36V

B+

37.6 - 30.6V

Input

J1-5

RED/BLK

Forward/Reverse

VDC

-36V

B+

37.6 - 30.6V

Input
Ground
Ground

J1-6
J1-7
J1-9

BLU/BLK
BLK
BLK

Direction
Power Supply
Power Supply

VDC
VDC
VDC

-36V
-36V
-36V

B+
B+
B+

37.6 - 30.6V
37.6 - 30.6V
37.6 - 30.6V

Output

Solution Solenoid
Pulsed
J1-11 RED/GRN Note: Coil resistance spec Voltage
72Ω ±20%

Output

J1-12

BLK/YEL

Vacuum Contactor
Note: Coil resistance
spec - 102Ω ±20%

PWM
Voltage

Power

J1-13

BRN

Power Supply

VDC

Output

J1-14

VIO/BLK

Brush Contactor
Note: Coil resistance
spec - 98.5Ω ±20%

Output

J2-1

VIO/YEL

Actuator

Input

J2-4

GRA/WHT Recovery Tank Float Switch

Input

J2-5

WHT/GRA

Brush Current Sense

Ground
Power

J2-6
J2-7

BLK
BRN

Output

J2-8

Ground
Input

B+

37.6 - 30.6V

B- (Gnd)

+/- .7V depending
on battery voltage

+36V

B- (Gnd)

37.6 - 30.6V

PWM
Voltage

+7.2V

B- (Gnd)

+/- .7V depending
on battery voltage

VDC

36V

J2-8

37.6 - 30.6V

VDC

-36V
-31V

B+
B+

37.6 - 30.6V
31.6 - 25.6V

Solenoid voltage is pulsed
between 36V and 0V at a rate of
about one on/off cycle every ive
seconds.
5000 Hz freq, 80% duty cycle
Vacuum Motor is Active (~6.9V),
0% duty cycle Vacuum Motor is
off (~36V)
Key is switched On
5000 Hz freq, 80% duty cycle
Brush Motor is Active (~6.9V),
0% duty cycle Brush Motor is off
(~36V)
+36V while lowering, -36 while
raising
Recovery Tank is not Full
Recovery Tank is Full

B- (Gnd)

0.20 - 0.05V

Brush Motors are Active

Power Supply
Power Supply

Analog
Voltage
VDC
VDC

-36V
+36V

B+
B- (Gnd)

37.6 - 30.6V
37.6 - 30.6V

WHT/GRN

Actuator

VDC

36V

J2-1

37.6 - 30.6V

J2-9

BLK

Power Supply

-36V

B+

37.6 - 30.6V

J2-10

ORN

Vacuum Current Sense

VDC
Analog
Voltage

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Comments
Pulsed Signal equal to the Fault
Code lashed by the Speed
Control Built-in Status LED
Machine is not in Neutral (a palm
drive switch is pressed)
Machine is traveling in Reverse

+0.12V B- (Gnd)

0.13 - 0.11V

-36V while lowering, +36 while
raising
Vacuum Motor is Active

Control Panel

Service Test Mode
To assist in the troubleshooting and servicing of the electrical system and related components, a special test mode
allows independent control of the various outputs and monitoring of the various inputs To enter the service test
mode perform the following step:
1

Turn the key switch to the off position

While holding the Vacuum switch (C) depressed, turn the key switch to the on position

Continue to hold the Vacuum switch until the Vacuum indicator turns green
• The Display will show “t” for Test Mode

To exit Service Test Mode, turn the key switch to the off position.

Test Mode Input Indicators
Battery Voltage
The battery voltage, as detected by the controller, is shown in the display If this displayed voltage differs
signiicantly from the actual battery voltage, it indicates a poor connection between the batteries and the controller.
• The LED display (J2) will lash out the voltage. For example, “3”, “8”, “-”, “2” represents 38.2 volts.
Speed Controller Status
This is a Main controller input from the Curtis Drive controller The indicator is
passed through the Main controller without interpretation, and represents the error
code from the Drive controller

J3 J4 J5

• The green light in the battery indicator (j5) will light whenever the key is on If
there is a speed control fault, the indicator will lash the fault code produced by
the speed controller
Refer to the speed control section for details on these codes If the indicator does not
display, disconnect the Orn/Blu wire from the speed controller and main controller
and check the continuity of the wire If the wire tests open repair or replace the wire
or plug If wire tests OK, the fault is likely with the Drive controller

SVCTEST
36.5V
F/R
REV

SCS

Forward/Reverse Status
This indicator comes from the Curtis Drive controller, and indicates that the Curtis Drive Controller is trying to
move the machine in response to operator request. The indicator is active when the signal is low.
• The middle battery indicator (J4) will be yellow when the “machine moving” signal is present
Reverse Status
This indicator comes from the Curtis Drive controller and indicates when the Curtis Drive Controller is trying to
move the machine in REVERSE in response to operator request.
• The red battery indicator (J3) will light when the “reverse” signal is present (The machine moving signal should
also be present when the machine is moving in reverse, so the yellow battery indicator should also be on )

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Control Panel

Test Mode Output Controls
The control panel switches are used to control various output functions of the Main controller while in Test Mode
Below is a list of each switch and the function it controls Following the list is a detailed description of each function
Scrub off Switch (H): Controls the brush motors
Scrub on Switch (I): Controls the scrub deck lift actuator
Vacuum Switch (C): Controls the vacuum motor
Wand Switch (E): Jogs the scrub deck lift actuator
Solution Switch (B): Turns on the solution solenoid valve
Detergent System Switch (F): Turns on the chemical pump (If available)
Description of Output Controls
Scrub System Off Switch (H):
This switch is used to toggle the state of the brush motor contactor Pressing and releasing this switch will
alternately turn the brush motor contactor on and off The indicator provides the following status information:
Off – Brush motor output is off and there is no brush motor current sensed
Steady Green – Brush motor output is on and there is normal brush motor current sensed
Brief On Green Flash – Brush motor output is off and brush motor current is being sensed (abnormal condition)
• Check for voltage at the Wht wire on K1 contactor to battery ground
• If any voltage is present, replace K1 contactor
• NO voltage, replace the Main control board
Brief Off Green Flash – Brush motor output is on and brush motor current is not being sensed (abnormal condition)
• Check brush motor wiring plugs
• Check one of the Blk wires of the main harness connector at the brush motor to battery Positive If no voltage
repair or replace wire
• Check one of the Wht wires of the main harness connector at the brush motor to battery Neg If no voltage repair
or replace wire
• Check for voltage at the Red wire on K1 contactor to battery ground If no voltage is present repair the Red wire
• Check for voltage at the Wht wire on K1 contactor to battery ground If no voltage is present replace the K1
contactor
Flashing Red – Brush motor overload has occurred
• Check to see that the proper brush programming type is selected (disc or cyl)
• Check for binding in rotation of brushes or improper scrub brush type installed (Amp Test) See Pressure Chart
in this Manual
• Check the negative supply cable at the brush motor for a wiring problem or improper modiications.
• Check for open in the small WHT/GRA current sense wire.
• Check for short circuit* in brush motor or wiring
• Inspect gearbox for failure (disc). Repair or replace.
• Inspect scrub brush drive bearings for excessive wear (cyl.).

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Control Panel
Scrub On Switch (I)
This switch is used to control the output to the scrub deck lift actuator Pressing and releasing this switch will cycle
the actuator output through 4 states These are:
1 – Output off, direction = up
2 – Output on, direction = down
• The normal scrub on indicator will be green
3 – Output off, direction = down
4 – Output on, direction = up
• The normal scrub on indicator will be yellow
When the output is in state 1, the actuator output is turned off The scrub pressure decrease indicator should be
off. If the indicator is lashing green, this indicates that the control is sensing current low through the actuator
(shorted output driver, control error) If the scrub pressure decrease switch was the last switch pressed, it is possible
to momentarily activate the actuator output using the wand switch This can be used to jog the actuator to allow
precise positioning of the actuator Note: the actuator can only move in this situation if it is not at its up limit
When the output is in state 2, the actuator output is turned on The scrub pressure decrease indicator should be
green or lashing green. The indicator will be a steady green if the control senses current low through the actuator.
It will lash green if no actuator current low is sensed (actuator at limit, open circuit, open output driver). The wand
switch has no effect in this state
When the output is in state 3, the actuator output is turned off The scrub pressure decrease indicator should be
off. If the indicator is lashing green, this indicates that the control is sensing current low through the actuator
(shorted output driver, control error) If the scrub pressure decrease switch was the last switch pressed, it is possible
to momentarily activate the actuator output using the wand switch This can be used to jog the actuator to allow
precise positioning of the actuator Note: the actuator can only move in this situation if it is not at its down limit
When the output is in state 4, the actuator output is turned on The scrub pressure decrease indicator should be
green or lashing green. The indicator will be a steady green if the control senses current low through the actuator.
It will lash green if no actuator current low is sensed (actuator at limit, open circuit, open output driver). The wand
switch has no effect in this state
Vacuum Switch (C)
This switch is used to toggle the state of the vacuum motor Pressing and releasing this switch will alternately turn
the vacuum motor on and off The indicator provides the following status information:
Off - Vacuum motor output is off and there is no vacuum motor current sensed.
On Steady Green - Vacuum motor output is on and there is normal vacuum motor current sensed.
Brief On Green Flash – Vacuum motor output is off and vacuum motor current is being sensed (abnormal condition)
• Check for voltage at the Blu wire on K2 contactor to battery ground
• If any voltage is present, replace K2 contactor
• NO voltage, replace the Main control board
Brief Off Green Flash – Vacuum motor output is on and vacuum motor current is not being sensed (abnormal
condition)
• Check Vacuum Motor wiring plug, disconnection
• Check for voltage at the Red wire on K2 contactor to battery ground If no voltage is present repair the Red wire
• Check for voltage at the Blu wire on K2 contactor to battery ground If no voltage is present replace the K2
contactor
• Check the Blu wire of the main harness connector at the vacuum motor to battery Negative If no voltage repair
or replace wire

30 - FORM NO. 56043162 - Focus II Large

Control Panel
• Check the Blk wire of the main harness connector at the vacuum motor to battery Positive If no voltage repair or
replace wire
Flashing Yellow – Vacuum motor overload has occurred
• Check for an open in the small ORG current sense wire
• To conirm an overload, disconnect the motor plug from the main harness, run a 30 amp fused test leads from the
batteries to the motor and perform an Amp draw test. Normal current load 36V 16-19 Amps.
• Check for debris in the vacuum motor
• Worn carbon brushes
• Defective motor bearings
• Check for short circuit* in vacuum motor or wiring Repair or replace
Solution Switch (B)
This switch is used to toggle the state of the solution solenoid Pressing and releasing this switch will alternately
turn the solution solenoid (L1) on and off The indicator provides the following status information:
Off - Solution output is off.
Steady Green - Solution output is on.
Flashing Yellow – Solution solenoid overload has occurred
Detergent Switch (F)
This switch is used to toggle the state of the chemical pump (if the machine is so equipped). Pressing and releasing
this switch will alternately turn the chemical pump on and off The indicator provides the following status
information:
Off – Chemical pump and valve off
Steady Green – Chemical output is on

31 - FORM NO. 56043162 - Focus II Large

Solution System

Solution System
Functional Overview
The main body of the machine also serves as the solution tank. The solution tank has a ill capacity of 30 gallons
(114 liters). All models use one right rear tank ill opening for ease of illing. A serviceable Solution Filter is
plumbed into the manual solution shutoff valve outlet to keep debris from entering the solenoid valve. Also itted to
the tank is a lexible drain hose that also serves as a water level sight tube.
The solution system uses an electrical Solenoid Valve (L1) which stops and starts the solution low to the scrub
brushes The electrical circuit that turns on (energizes) the solenoid coil is activated through the (A1) control
panel’s solution switch button input and the FWD / REV (A2) Speed Controller voltage output signals Note: See
the Know Your Machine section in this manual for a complete explanation of the solution operation modes.
During normal machine scrubbing, the solution system’s Auto Mode is selected and works in conjunction with the
wheel drive speed controller and the (A1) main controller’s scrub system outputs to turn the (L1) solenoid valve
on and off. The solution will low to the scrub brushes when the scrub deck is lowered and a palm drive button is
pressed Note: When the solution on/off button is turned off, no low can occur while the machine scrub deck is
down and a palm drive button is pressed

Water Level
Sight Tube
Solution Tank

Solution Out
To Scrub Deck

Shutoff Valve
Solution Filter

32 - FORM NO. 56043162 - Focus II Large

Solution System

Circuit Overview
The 34 RST machines do not use a solution pump. The gravity-fed solution rate is controlled by cycling the solution
solenoid on and off at the rates shown in the table below. The three solution low rates listed are managed by the A1
control board’s negative voltage output from the terminal J1-11 Red/Grn wire. This input from A1 to the solution
solenoid also requires negative voltage from Pin 6 - Brake on the speed controller (A2) to J1-5 – For/Rev. on A1 (Red/
Blk wire). The J1-11 Red/Grn L1 solenoid circuit turns on and off to open and close the L1 solenoid which controls
the three different solution low rates by gravity feed only. The total solenoid cycle time is approximately six
seconds. The solution low is proportional to the time the solenoid is on (open) during the total solenoid cycle time.
The approximate solenoid on/off times corresponding to the three solution low rate is shown in the table below.
Solution Indicator
One-bar gauge
Two-bar gauge
Three-bar gauge

Flow Rate
0.3 g/m
0.6 g/m
0.9 g/m

Solenoid On Time
2 sec.
4 sec.
6 sec.

Solenoid Off Time
4 sec.
2 sec.
0 sec.

Electrical Diagram
Note: For a complete description of all callouts see the Electrical System/Wiring Diagram/Schematic section in this
manual.
F1

RED

BT1

RED

FUSE, 150 A.

BLK

BATTERY

36 VDC
A1
CONTROL BOARD

F2
BRN

RED
1
2
CIRCUIT BREAKER, 5 AMP

BRN

J2-7

B+2
J2-1

BRUSHACTUATOR2

L1
1

RED/GRN

J1-11

SOLUTIONSOLENOID

FOR/REV.

REVERSE

B+1

B-1
B-2
B-3
B-4

J1-7
J1-9
J2-9
J2-6

BLK
BLK
BLK
BLK

ORN/BLU
RED/BLK
BLU/BLK

J1-4

J1-13

J1-6

BRN

SW, SPST KEY

J1-5

BRN

STATUS

COIL, SOLUTIONSOLENOID

VACUUM MOTOR SENSE

BRN

J2-4

RECOVERY TANK FULL
VACUUMCONTACTOR

BRUSH MOTOR SENSE

J1-12

J2-8

BRUSHACTUATOR1

J2-5

BRN

BRUSHCONTACTOR

J2-10

J1-14

F3
RED

WHT/YEL

BLK

CIRCUIT BREAKER, 30 AMP
B+
A2
1228 SPEEDCONTROLLER

BPIN9 - STATUS
PIN6 - BRAKE (-)
PIN16 - REV

PIN5 - KSI

33 - FORM NO. 56043162 - Focus II Large

ORN/BLU
RED/BLK
BLU/BLK
BRN
RED/VIO

Solution System

Maintenance
• Solution Tank: Empty the solution tank weekly; remove the solution Drain Hose from its storage area (located
on the right rear control handle compartment). Direct the hose to a designated “Disposal Site” and lush the tank
with clean water
• Solution Filter: Remove and clean the inline Solution Filter. To access the ilter housing for removal, work
underneath the middle right rear side of the machine’s chassis. No tools are needed to remove the ilter (hand
tighten only) Service Tip: The solution manual shutoff valve must be placed in the OFF (Closed) position This
prevents loss of solution when servicing the ilter strainer with a partial or full tank.

Troubleshooting Guide
Problem

Possible Cause

Inadequate or no solution low

No solution in the tank
Solution tank ilter ball valve in the off position
Clogged solution ilter, solenoid valve or hoses

Electrical Troubleshooting
Possible Symptom - No solution low while in the scrub auto solution mode.
Note: Activate the Service Test Mode Program. See the Electrical System/Service Test Mode section in this manual for instructions.
All testing will be performed in the Service Test Mode Program.
Symptom

No solution flow when scrubbing in the auto solution mode.
Note: Activate the Service Test Mode Program. See optional program section for instructions.

While in the Service Test
Mode activate the solution
button. Does the L1 solenoid
click turn on & off, pulse as
designed ?

Yes
Inspect the solution system
components listed below to
help locate the cause for the
solution not feeding through
an electrically (good)
functional L1 valve.

Separate the wiring
harness connector
that feeds the L1
solenoid ( 2 wires
Brn & Red/Grn).
Activate the solution
button & test for 36V.
Yes

•Clogged solution filter,
fittings & or hoses.
•Clogged L1 solenoid valve.
Disassemble clean, repair or
replace.

34 - FORM NO. 56043162 - Focus II Large

Test the L1 coil
resistance (spec. 75
ohms).
No

•No solution in tank.
•Solution tank shut-off valve
closed.

Test the continuity of
the wiring to coil L1
(Brn & Red/Grn
wires). Repair or
replace damaged
wires. Is there
voltage @ the L1
coil?

Replace the L1
solenoid valve.

Replace the A1
control board

Solution System

Removal and Installation
Solenoid Valve Removal
1

Drain the solution tank or turn off the solution ball valve to prevent solution loss

Shut off the key switch and disconnect the battery connector

Note: You may want to jack up the left side of the machine for better access to the Solenoid Valve (H) and associated
hardware. If you choose to jack up the machine, make sure you support the machine with safety stands or
blocking to prevent the machine from dropping and possibly causing personal injury or machine damage.
Warning! Never work under machine without safety stands or blocking to support the machine.
3

Unplug the L1 solenoid valve Connector Assembly (G) from the machine harness Note that you may need to
cut the wire tie

Note: You may want to place a pan underneath the Solenoid Valve (H) to catch any water remaining in the Inlet
and Outlet hoses when you disconnect the hoses.
4

Loosen the Hose Clamps (K) holding the Inlet Hose (N) and Outlet Hose (L) to the Solenoid Valve (H)

Carefully remove (pry off) the Outlet Hose (L) from barbed itting on the Solenoid Valve (H)

Remove the 2 Phillips Pan Head Screws (M) and Washers (J) holding the valve to the machine frame

Carefully remove (pry off) the Inlet Hose (N) from the barbed itting on the Solenoid Valve (H) and remove the
Solenoid Valve (H) from the machine

Solenoid Valve Disassembly and Cleaning
1

Remove the Solenoid Valve (H) See the Solution System/Solenoid Valve
Removal section above for instructions

Remove the 4 Screws
(O) and disassemble the
Solenoid Valve (H) Be
careful not to lose any
internal parts

Thoroughly wash any
dirt or debris from
the Block (P) and
Diaphragm (Q)

After reassembling, test
the Solenoid Valve (H)
for correct operation

35 - FORM NO. 56043162 - Focus II Large

Solution System

Solution Filter and Ball Valve Removal
1

Drain the solution tank using the solution drain hose (B).

Loosen the 2 Hose Clamps (R) and carefully remove (pry off) the solution Inlet Hose (S) and Outlet Hose (T)
from the Filter/Valve Assembly (F)

Remove the 2 Hose Clamps (U) that secure the Filter/Valve Assembly (F) to the chassis and remove the Filter/
Valve Assembly (F) from the machine

36 - FORM NO. 56043162 - Focus II Large

Scrub System

Scrub System
Functional Overview
The 34 RST models use the disc-type scrub system powered by (2) 3/4 HP motor gearbox assemblies.
Note: Recovery Tank Full switch must be open (Tank empty). On all models the scrub deck platform
is raised and lowered automatically by a vertically-mounted electric lift actuator motor. The operation of the
machine’s scrub functions are activated when the operator selects (presses) the scrub on (mode) panel button The
scrub pad or brush pressure ranges (1-3) are selectable allowing the operator the choice to vary the scrubbing effort
(pressure) while operating the machine Note: See the Electrical System/Main Control Programming Options
section in this manual for more detailed operation and instructions on how to change the factory default regular
scrub pressure settings
The machine’s main scrub system input and output operating functions are regulated (managed) by the display
panel and combined main control board A1 The major scrub system functions are:

M2/M3 - Scrub Brush Motor Run Function
Scrub Brush Motor Circuit Overview
+ (Positive) circuit input starts with:
− A closed S3 key switch supplies the needed positive voltage to the A1 control board #J1-13 (Brn wire).
− A closed 5-amp circuit breaker (F2) supplies positive battery voltage (Brn wire) to the control side of the brush motor contactor coil (K1).
− Once the load side of K1 is closed, the needed positive battery voltage is supplied to motors M2 and M3.
- (Negative) circuit input starts with:
− Negative battery voltage is supplied to the A1 control board at terminals B1 (J1-7) Blk, B2 (J1-9) Blk, B3 (J2-9) and B4 (J2-6) Blk.
− Note: The A1 control board scrub-on button must also be depressed (enabled).
− When a palm drive switch is pressed (S6/S7), Pin 6 – Brake on the speed controller (A2) supplies negative voltage to J1-5 – For/Rev. on A1
(Red/Blk wire).
− A negative voltage output from J1-14 – Brush Contactor (Vio/Blk wire) is supplied to the K1 solenoid coil control circuit and pulls in the load
contacts on K1.
− The negative load voltage is supplied from the battery negative to motors M2 and M3.

M5 - Scrub Brush Actuator Lift Motor Function
The A1 control board outputs a controlled motor voltage polarity change (wires J2-1 and J2-8) that raises and
lowers the scrub deck for installing, removing and controlling the scrub brushes’ selected current load The large
Blk negative (-) scrub brush motor wire is specially designed so that it has a known (speciied) resistance value. As
brush motor current passes through the negative wire that is, in effect, a low-value resistor, a small voltage drop
is developed across it which is proportional to the motor current This voltage change is inputted to the A1 control
board at J2-5 and J1-7 (sense wires Wht/Gra and Blk). Any surrounding temperature change in this large Neg.
motor wire affects its resistance so the temperature is sensed by a thermistor built into the control board A1 This
allows the controller to provide error correction for the temperature resistance changes When the controller senses
a current draw out of the desired range, it automatically turns on the M5 actuator motor to raise or lower the scrub
deck This process is ongoing in maintaining the operator’s selected scrub motor current load setting to sustain the
desired brush working pressure

Scrub System Low-voltage Cut-out Function
The purpose of the special low battery voltage cut-out function is to help prolong battery life. The scrub deck will be
raised and the brush motors and solution solenoid valve will turn OFF automatically and cease to function when the
batteries discharge to the selected cut-out level. The cut-out level is adjustable between two settings. The standard
(S) setting (wet cell/lead-acid) is 31.34 volts or 1.74 volts per cell. The alternate (A) setting (gel/maintenance free)
is 32 63 volts or 1 81 volts per cell Note: See the Electrical System/Main Control Programming Options section in
this manual for instructions on how to select the appropriate voltage cut-out threshold.
Special Service Note: There is a minimum battery charge level that the must be reached before the low-voltage cut-out function will reset and allow
the machine to function again. On the 34 RST, the batteries must be charged to a minimum of 37.6 volts (2.09 volts per cell) in order to reset the lowvoltage cut-out function.

37 - FORM NO. 56043162 - Focus II Large

Scrub System

Electrical Diagram

FIGURE 1
F1

RED

BT1

RED

FUSE, 150 A.

BLK

BATTERY

36 VDC
A1
CONTROL BOARD

F2
RED
1
2
CIRCUIT BREAKER, 5 AMP

BRN

BRN
BRN

J2-7

B+2

M5
J2-1

BRUSHACTUATOR2

VIO/BLK

J1-14

BRUSHCONTACTOR

J2-8

BRUSHACTUATOR1

COIL, BRUSHMOTORCONTACTOR

FOR/REV.

STATUS

REVERSE

B-1
B-2
B-3
B-4

J1-7
J1-9
J2-9
J2-6

BLK
BLK
BLK
BLK

WHT/GRA
ORN

J1-6

J1-5

B+1

J2-11

J1-13

J1-4

BRN

PUMP

BRN
SW, SPST KEY

CHEMICAL

S3
BRN

VACUUM MOTOR SENSE

SOLUTIONSOLENOID

BRUSH MOTOR SENSE

J1-11

J2-4

RECOVERY TANK FULL
VACUUMCONTACTOR

J2-5

J1-12

J2-10

BRN

VIO/YEL
M
WHT/GRN
MOTOR, BRUSHACTUATOR

RED

K1
K1

WHT

M2
M

BLK

MOTOR, LEFT BRUSH
M3
+
WHT
BLK
M
MOTOR, RIGHT BRUSH
M4

38 - FORM NO. 56043162 - Focus II Large

WHT/GRA

BLK

Scrub System

Removal and Installation
Motor Gimbal
1

Make sure the scrub brush deck is in its raised position, then turn the key switch off and disconnect the battery
pack
Caution! Disconnect the battery pack connector before servicing machine.

See Figure 2. Unlatch and remove the left- and right-hand Brush Housings (A and B)

Push the brushes/pads straight down to remove them from the Motor Gimbals (C)

Remove the 5/16”-18 Socket Head Screw (D) using a ¼” hex wrench, then remove the Motor Gimbal (C), Brush
Driver Collar (E) and Key (F) from the scrub motor shaft

Special Service Note: If the 5/16”-18 Socket Head Screw (D) is frozen in
the scrub motor shaft, it may be easier to remove the scrub deck
from the machine before you remove the screw. (Refer
to the Scrub Brush Deck Removal section in this
manual.)
5

To reinstall the Motor Gimbal (C), follow the above
steps in reverse order Note: Apply a small
amount of grease or a product called “NeverSeez®” to the scrub motor shaft when
reinstalling the Motor Gimbal (C),
Brush Drive Collar (E) and
Key (F)

FIGURE 2

39 - FORM NO. 56043162 - Focus II Large

Scrub System

Scrub Brush Deck
1

With scrub brushes installed, lower the scrub brush deck, turn the key switch off and disconnect the battery
pack
Caution! Disconnect the battery pack connector before servicing machine.

Note: If the battery pack is connected and the key switch is switched on when the scrub brush deck is lowered, the
deck will automatically rise to its upper limit. This could cause personal injury or machine damage.
2

Remove the front nose cone by irmly grasping the lower part and lifting straight up.

See Figure 2. Unlatch and remove the left- and right-hand Brush Housings (A and B)

See Figure 3. Disconnect the Solution Hose (G) from the Coupler Barb (H)

See Figure 2. Unplug both Motor/Gear Unit Assemblies (M2 and M3) (J) Note: Cable ties may need to be
cut

Service Note: If you have an optional Actuator Power Cord Adapter (Advance Part #56407502), you can use the
Adapter to run the lift actuator up or down to relieve the pressure on the connecting hardware and ease
removal of the Pin (K).
6

Remove either of the Cotter Hair Pins (L) and remove the Pin (K) to detach the Lift Actuator Assembly (T)
from the lower mount on the Deck Weldment (N) Note: Lift up on the scrub brush deck to take pressure off
the Pin (K)

Service Note: It is important not to run the actuator motor or the rotate the spring housing assembly on the lead
screw while the Lift Actuator Assembly (T) is disconnected from the scrub brush deck or chassis mounts.
This precaution will prevent the actuator drive nut from getting out of adjustment (moved out of its set
speciication) and will maintain the correct actuator “IN” / “OUT” travel limits.
7

Remove the Cotter Hair Pin (O) and Washers (P) on either side of the Linkage Pivot Pin (Q) and remove the
Linkage Pivot Pin (Q)

Remove the Cotter Hair Pin (R) and Washer (S) from the mounting boss on the Deck Weldment (N)

Make sure the Lift Actuator Assembly (T) is clear of the scrub brush deck, then carefully slide the scrub brush
deck toward the right (operator’s left) to disengage the mounting boss from the Linkage Arm (U)

10 Slide the deck toward the front to remove it from the machine
11 To reinstall the scrub brush deck, follow the above steps in reverse order
Service Note: If you want to run the transaxle motor to move the machine with the Lift Actuator Assembly (T)
disconnected from the scrub brush deck, irst disconnect the lift actuator motor wiring harness pigtail
connector. This will prevent the lift actuator motor from running automatically when you turn on the key
switch, and will keep drive nut and the actuator “IN” / “OUT” travel limits from getting out of adjustment.

40 - FORM NO. 56043162 - Focus II Large

Scrub System

Scrub Brush lift Actuator
1.

See Figure 3. With scrub brushes installed, lower the scrub brush deck, turn the key switch off and disconnect
the battery pack

Note: If the lift actuator motor will not run, go to step 2, then shim up the brush deck to relieve the pressure on the
connecting hardware to ease removal of the Lift Actuator Assembly (T).
2

Remove the front nose cone by irmly grasping the lower part and lifting straight up.

Disconnect the actuator motor wiring harness pigtail connector

See Figures 2 and 3. Remove either of the Cotter Hair Pins (L) and remove the Pin (K) to detach the Lift
Actuator Assembly (T) from the lower mount on the Deck Weldment (N) Note: Lift up on the scrub brush deck
to take pressure off the Pin (K)

See Figure 3. Remove the Cotter Hair Pin (V) from the Ring Pin (W)

Hold the Lift Actuator Assembly (T) securely, remove the Ring Pin (W) from the Actuator Mount Weldment (X),
then remove the Lift Actuator Assembly (T) from the machine

*Important Service Note: If you’ve installed a new motor or drive nut in an actuator lift assembly, or if the
actuator has gotten out of adjustment, you will need to check the actuator “IN” and “OUT” travel limits and
set them to the correct speciications if necessary. Refer to the Electrical System / Lift Actuator Assembly and
Travel Limit Adjustment section and follow these instructions before installing the actuator motor assembly
in the machine.
7

After setting the correct actuator “IN” and “OUT” travel limits, follow the above removal steps in reverse order
to reassemble

FIGURE 3

41 - FORM NO. 56043162 - Focus II Large

Scrub System

Scrub Brush Motor/Gearbox
1

Remove the scrub deck from the machine following the steps in the Scrub Brush Deck Removal section

Turn the brush deck on its back

See Figure 2. Remove the brushes/pads from the Motor Gimbals (C) If removing both Motor / Gear Unit
Assemblies (J), mark the location of the Assemblies on the Deck Weldment (N) for correct reassembly

Remove the 5/16”-18 Socket Head Screw (D) holding the Motor Gimbal (C) to the motor output shaft, then
remove the Motor Gimbal (C), Brush Driver Collar (E) and Key (F) Make sure to save the Key (F)

Remove the (4) 3/8”-16 Hex Head Locking Screws (Y) holding the Motor / Gear Unit Assembly (J) to the Deck
Weldment (N) and remove the Motor / Gear Unit Assembly (J)

Reinstall the Motor / Gear Unit Assembly (J) by following the above steps in reverse order, then test for correct
operation Note: Apply a small amount of grease or a product called “Never-Seez®” to the output shaft on the
Motor / Gear Unit Assembly (J) when reinstalling the Motor Gimbals (C), Brush Drive Collars (E) and Keys
(F)

Reinstall the scrub deck by following the steps in the Scrub Brush Deck Removal section

42 - FORM NO. 56043162 - Focus II Large

Recovery System

Recovery System
Functional Overview
See Figure 1. Dirt and water are lifted off the loor into the recovery tank by airlow created by a three-stage 36V
vacuum motor. The wastewater and air enter the vacuum system at the squeegee tool through small openings
(notches) in the front squeegee blade. The small openings are the entrance points for the water and air and help
speed up the airlow, producing the suction to lift the wastewater off of the loor. The air and wastewater move
through the squeegee hose at high speed until the wastewater reaches the recovery tank. There the air slows down
because of the increased volume (large size) of the tank With the decreased air speed, the heavier water falls to the
bottom of the recovery tank. The airlow continues through the tank, vacuum fan inlet screen and vacuum motor,
and is exhausted out of the vacuum exhaust hose. No wastewater ever actually moves through the vacuum motor,
just the working air
The vacuum system uses a loat switch to prevent the tank from being overilled and stops any water from being sucked into the vacuum motor.

FIGURE 1

43 - FORM NO. 56043162 - Focus II Large

Recovery System

Vacuum Motor Control Circuit Overview (Auto Mode)
+ (Positive) Circuit input starts with:
• A closed S3 key switch supplies the needed positive voltage to the A1 control board J1-13 (Brn wire). Note: The
A1 control board scrub-on button must also be depressed (enabled). This operator command lowers the brush
deck
• A closed 5-amp circuit breaker (F2) supplies positive battery voltage (Brn wire) to the control side of the vacuum
motor contactor coil (K2)
• Once the load side of K2 is closed, the needed positive battery voltage is supplied to motor M4
- (Negative) circuit input starts with:
• Battery negative ground inputs at the A1 control board terminals B-1 (J1-7), B-2 (J1-9), B-3 (J2-9) and B-4 (J2-6)
at the A2 speed controller terminal B-.
• A negative voltage output from the A2 speed controller’s (pin #6) Brake Neg to the A1 control boards Red/Blk
wire (J1-5) For/Rev. Note: The A2 speed control brake output (pin #6) occurs whenever a palm drive switch (S6/
S7) is pressed This operator command happens when a palm drive button is pressed to run the wheel drive
motor. The recovery tank full loat switch (S4) must be open (in its lowered position) in order for a negative
voltage output from the A1 board’s terminal J1-12 Blk/Yel wire to complete the K2 solenoid coil circuit (Pos. and
Neg ) and pulls in the solenoid load contact K2 making the vacuum motor run
• The Neg M4 load voltage is supplied from the battery Neg
Note: For a complete description of all callouts see the Electrical System/Wiring Diagram/Schematic section in this
manual.

FIGURE 2
F1

RED

BT1

RED

FUSE, 150 A.

BLK

BATTERY

36 VDC
A1
CONTROL BOARD

F2
RED
1
2
CIRCUIT BREAKER, 5 AMP

BRN

J2-7

B+2
J2-1

BRUSHACTUATOR2
J1-14

BRN

BLK/YEL

J1-12

BRUSHCONTACTOR

J2-8

BRUSHACTUATOR1

J2-4

RECOVERY TANK FULL

VACUUM MOTOR SENSE

BRUSH MOTOR SENSE

FOR/REV.

REVERSE

STATUS

B-1
B-2
B-3
B-4

M4
MOTOR, VAC
K2
K2

BLU

44 - FORM NO. 56043162 - Focus II Large

BLK

ORN

J1-4

J1-6

J1-5

B+1

J2-11

J1-13

PUMP

BRN

CHEMICAL

BRN
SW, SPST KEY

J2-5

SOLUTIONSOLENOID

J2-10

J1-11

RED

SWITCH, FLOAT

COIL, VACMOTORCONTACTOR

BRN

GRA/WHT

VACUUMCONTACTOR

BLK

J1-7
J1-9
J2-9
J2-6

BLK
BLK
BLK
BLK

BLK

Recovery System

Maintenance
Service Maintenance Checklist
Whenever there is a vacuum problem, it’s best to check over the entire system Use the checklist below as a guide to
thoroughly check the vacuum system

□
□
□
□
□
□
□

Inspect and clean the vacuum motor loat switch. (If the switch is closed [tipped up] the vacuum motor will not operate)
Clean built-up dirt from the inside of the squeegee tool.
Replace the squeegee blades if they are nicked or torn.
Inspect the hose between the squeegee tool and the recovery tank and rinse any built-up dirt from the hose. Replace the hose if it is kinked or
damaged.
Inspect and make sure the gasket on the recovery tank cover is sealing and not damaged.
Make sure that the recovery tank drain hose cap seals airtight.
Inspect and clean the vacuum motor inlet ilter screen.

Troubleshooting Guide
If water lows around the ends of the squeegee tool instead of being pulled into the tool, the vacuum system is not
working correctly When a vacuum system performs poorly it is usually because of one of the following problems:
Vacuum Leaks – Air lowing into the vacuum system past a bad gasket or leaky hose, damaged tank or a leaky
drain valve A vacuum leak below the water line will create turbulence in the recovery tank, causing water to enter
the vacuum motor
Restrictions – Anything that blocks the low of air through the system. Restrictions may also be caused by built-up
debris in the squeegee tool, vacuum hoses or vacuum motor inlet screen, or wherever the airlow is forced to make a
sharp turn
Both leaks and restrictions decrease the quantity of air lowing through the squeegee tool. The air that does go
through the squeegee tool moves slower, so it has less suction (water lift performance).

45 - FORM NO. 56043162 - Focus II Large

Recovery System

Maintenance of the Recovery Tank Float Switch
If the recovery tank loat switch becomes dirty it can impair the operation of the recovery system. A dirty vacuum
shutoff switch can cause the vacuum motor to not function at all, or fail to shut off when the tank is full
If daily rinsing of the recovery tank is not suficient to keep the switch clean you may need to remove the loat
arm for cleaning. The loat arm can be removed easily by grasping it as shown below and twisting to remove. It
is very important that the loat switch be reassembled correctly in order to function. See Figure 3 for the correct
orientation of the switch loat arm.

FIGURE 3

46 - FORM NO. 56043162 - Focus II Large

Recovery System

Maintenance of Vacuum Motor Inlet Screen
See Figure 4. The Vacuum Motor Inlet Screen (4) should be cleaned on a daily basis DO NOT run water down the
screen in an attempt to clean it If you do this you will be running water directly into the vacuum motor
To remove the Vacuum Motor Inlet Screen (4) from the recovery tank, grip, twist and pull up on the Vacuum Motor
Inlet Screen (4)

FIGURE 4

47 - FORM NO. 56043162 - Focus II Large

Recovery System

Removal and Installation
Vacuum Motor Removal
1

Drain the Recovery Tank (A) using the drain hose

Turn the key switch off and disconnect the battery pack

Swing open the recovery tank and disconnect the vacuum motor harness connector

See Figure 5. Carefully pull the Acoustical Foam vacuum exhaust hose (B) out of the P-Clamp (C) on the
Recovery Tank (A)

Remove the (4) Phillips Pan Head Screws (D) and Flat Washers (E) holding the Vacuum Motor Shroud (F) to
the bottom of the Recovery Tank (A), then remove the Vacuum Motor Shroud (F)

Carefully remove the Vacuum Motor Assembly (G) and attached Acoustical Foam vacuum exhaust hose (B)
from the Recovery Tank (A) Note: Take care not to lose the three Vibration Mounts (H)

Inspect the condition of the vacuum motor Gasket (J), and the gasket on the inside of the Vacuum Motor
Shroud (F)

Make service repairs to the vacuum motor and reinstall by following the above steps in reverse order

FIGURE 5

48 - FORM NO. 56043162 - Focus II Large

Recovery System

Recovery Tank Removal
1

If you wish to remove the vacuum motor from the Recovery Tank (A), do so by following steps 1-6 in the Vacuum
Motor Removal section

Disconnect the electrical connector to the Float Switch (K) Note that you may need to cut a cable tie to access
the connector

Loosen the Hose Clamp (L) and disconnect the Drain Hose (M) from the Recovery Tank (A)

Loosen the clamp and disconnect the Vacuum Hose Assembly (N) from the Recovery Tank (A)
Caution! The Recovery Tank is relatively heavy. You may choose to get some assistance when swinging

the Recovery Tank down after disconnecting the Cable Assembly, and when removing it from the
machine.
5.

See Figure 6. Remove the Phillips Pan Head Screw (P) and tank Cable Assembly (O) and allow the Recovery
Tank (A) to swing down to the side of the battery compartment box.

Support the Recovery Tank (A) and remove the (3) Phillips Pan Head Screws (Q) and lat Washers (R) that
attach the tank to the Hinge (S) and remove the Recovery Tank (A) from the machine

Reinstall the Recovery Tank (A) by following the above steps in reverse order

FIGURE 6

49 - FORM NO. 56043162 - Focus II Large

Squeegee System

Squeegee System
Maintenance
Squeegee Lift Linkage Adjustment
See the Know Your Machine section in this manual. The squeegee pick-up tool is raised and lowered manually by a
rear control panel mounted Lever (17)
Squeegee Lift Lever Adjustment
The squeegee tool’s storage and operating positions are adjustable. To adjust the squeegee position:
1

Lower the squeegee assembly to the loor.

See Figure 1. Note that the squeegee mount weldment has three Mounting Holes (A) for changing the up /
down squeegee positions.

Remove the Nyloc Nut (B) from the Hex Head Screw (C), then remove the Hex Head Screw (C), lat Washer
(D), Cable Bushing (E) and attached cable assembly from the squeegee mount weldment.

Reinstall in the Hex Head Screw (C), lat Washer (D) Cable Bushing (E) and attached cable assembly into the
appropriate hole to raise or lower the squeegee positions as needed, then reinstall the Nyloc Nut (B)

Make sure that the squeegee lift cable has ample free play when the squeegee is lowered. Note: This allows
the squeegee assembly the correct amount of up and down movement to allow the squeegee to “loat” so the rear
blade remains on the loor surface through normal adjustments and wear.

FIGURE 1

50 - FORM NO. 56043162 - Focus II Large

Squeegee System

Servicing the Squeegee
If the squeegee leaves narrow streaks or water, the blades may be dirty or damaged. Remove the squeegee, rinse it
under warm water and inspect the blades Reverse or replace the blades if they are cut, torn, wavy or worn
To Reverse or Replace the Rear Squeegee Wiping Blade:
1.

See Figure 2. Raise the squeegee tool off the loor, and then unsnap the Center Latch (23) on the squeegee
tool

Remove the Tension Straps (22)

Slip the rear blade off the Alignment Pins (24)

The squeegee blade has four working edges. Turn the blade so a clean, undamaged edge points toward the front
of the machine Replace the blade if all four edges are nicked, torn or worn to a large radius

Install the blade, following the steps in reverse order and adjust the squeegee tilt.

To Reverse or Replace the Front Squeegee Blade:
1

Raise the squeegee tool off the loor, loosen the (2) Thumb Nuts (25), disconnect the Recovery Hose (19) and
remove the Squeegee Assembly (13) from the mount

First remove both rear Tension Straps (22)

Remove all the wing nuts that hold the front blade in place, and then remove the front tension strap and front
blade

Install the blade, following the steps in reverse order and adjust the squeegee tilt.

Adjusting the Squeegee
Adjust the squeegee angle whenever a blade is reversed or replaced, or if the squeegee is not wiping the loor dry.
To Adjust the Squeegee Angle:
1

Park the machine on a lat, even surface
and lower the squeegee.

While moving the machine forward
slowly, turn the Squeegee Adjustment
Knob (26) until the rear squeegee blade
folds over evenly across the entire width
of the squeegee as shown below.

51 - FORM NO. 56043162 - Focus II Large

FIGURE 2

Squeegee System

Removal and Installation
Squeegee Mount Assembly Removal
1

Turn the key switch off and disconnect the battery pack

See Figure 3. Disconnect the Squeegee Hose (19) and remove the Squeegee Assembly (13) from the machine

Lower the Squeegee Lever (17) and disconnect the Squeegee Lift Cable (C) from the Squeegee Mount Assembly.

Service Note: The downward spring force on the squeegee mount weldment can make it dificult to remove and
reinstall the Squeegee Mount Assembly. You may choose to remove the squeegee level Wheels (F) from the
Squeegee Mount Assembly, or jack up the machine to reduce the effect of the downward spring force.
Note: If you choose to jack up the machine, make sure you support the machine with safety stands or blocking to
prevent the machine from dropping and possibly causing personal injury or machine damage.
Warning! Never work under machine without safety stands or blocking to support the machine.

Remove the Screw (D) through the access hole in the bottom of the chassis and slide the Squeegee Mount
Assembly (E) away from the chassis

Reinstall by following the above steps in reverse order Make sure the spacer bushing is installed on the Screw
(D), and the top and bottom Flange Bearings (G) are installed correctly in the Squeegee Mount Assembly (E)
before reinstalling and tightening the Screw (D)

Service Note: If you haven’t jacked up the machine, you may need to lift the rear of the squeegee mount weldment to
extend the springs slightly in order to correctly align the Squeegee Mount Assembly (E) with the chassis when
you install the Screw (D).

FIGURE 3

52 - FORM NO. 56043162 - Focus II Large

Squeegee System

Caster Wheel Removal
1

Turn the key switch off and disconnect the battery pack
Warning! Never work under machine without safety stands or blocking to support the machine.

Drain both the solution and recovery tanks. Remove the squeegee assembly and have the scrub brush deck in
the up (stored) position with the scrub brushes installed

See Figure 4. Place Wood Blocking (H) in front of the drive wheels to prevent the machine from rolling

Jack the machine in the location shown until the caster wheel is approximately 1” off the ground.

Place Blocking (I) under the chassis tab as shown

Remove the (4) Screws, Nuts and Washers (J) then remove the Caster Assembly (K)

Reinstall in reverse order

FIGURE 4

53 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Wheel Drive System
Functional Overview
See Figures 1 and 2. A 375 watt (0.5 HP) permanent magnet (36V) motor transaxle (M1) is used for the wheel
drive on all machines A Curtis PMC solid state speed controller (A2) regulates the variable speed and Fwd/Rev
wheel drive motor functions The controller is located in the rear electrical compartment (accessible by removing the
six screws securing the top main control panel). Two palm drive buttons, wired in parallel, actuate the transaxle
drive motor A reverse button controls the machine reverse A speed limit pot R1 (knob adjusted) mounted in the
handle regulates the machine’s maximum transport and scrub speeds.

Drive Motor System Function
See Figures 2 and 3. With the key switch S3 closed the Brn wire inputs 36V to the A2 speed controller (Pin
5-KSI) to make its internal control circuits operational (powering it up). The F3 circuit breaker (30 amp) supplies
the positive load circuit voltage input to the B+ controller terminal (Wht/Yel wire) The black wire from the battery
negative standoff supplies the (NEG.) input to the B- controller terminal.
Pressing either palm drive switch (S6 or S7) activates the operator input to the speed control which generates the
internal voltage signals (0-5volts) needed for the controller’s output operation. These control board voltage input
signals are what energizes the Fwd and Rev directional relays, which then selects the motor polarity and inal
voltage level outputs at the M1 and M2 terminals
When the operator turns the R1 speed limit Pot from min. to max. (clockwise) this causes an input resistance
relationship change between the pot high (+) and wiper terminals (high to low ohms) thus increasing the maximum
wheel motor operating speed range Turning the knob (counterclockwise) increases the resistance and the motor
speed range is reduced

FIGURE 1

54 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Electrical Diagram
Note: For a complete description of all callouts see the Electrical System/Wiring Diagram/Schematic section in
this manual

FIGURE 2
F1

RED

BT1

RED

FUSE, 150 A.

BLK

BATTERY

36 VDC
A1
CONTROL BOARD

F2
BRN

RED
1
2
CIRCUIT BREAKER, 5 AMP

BRN

J2-7

B+2

WHT/YEL

BPIN9 - STATUS
PIN6 - BRAKE (-)
PIN16 - REV

BRN/BLK

M1
-

YEL/RED

ORN/BLU
RED/BLK
BLU/BLK

PIN5 - KSI

BRN
RED/VIO

PIN17 - REV

GRN/VIO

M2
PIN4 - POT.WIPER

MOTOR, WHEEL DRIVE
PIN3 - POT.HI
PIN18 - SPEEDLIMIT POT
PIN13 - POT.LO

BLU/VIO

R3
100 OHM

BLK

GRN

BLK

BLU

S5
S5
1
2

BLK

BLK/VIO

BLK

ORN/VIO

ORN

BRN

WHT/VIO
R2

WHT

4.75K OHM

55 - FORM NO. 56043162 - Focus II Large

RED

S7
S7

S6
S6
1

1228 SPEEDCONTROLLER

2
3

B+

B-3
B-4

J1-7
J1-9
J2-9
J2-6

BLK
BLK
BLK
BLK

BLK

CIRCUIT BREAKER, 30 AMP
A2

B-1
B-2

WHT/GRA
ORN

J2-5

FOR/REV.

REVERSE
J1-6

STATUS

F3
1

J1-5

ORN/BLU
RED/BLK
BLU/BLK

J2-11

B+1

J1-4

J1-13

PUMP

BRN

VACUUM MOTOR SENSE

SOLUTIONSOLENOID

CHEMICAL

BRN
SW, SPST KEY

J2-4

RECOVERY TANK FULL
VACUUMCONTACTOR

S3
BRN

J2-8

BRUSHACTUATOR1

BRUSH MOTOR SENSE

J1-11

BRUSHCONTACTOR

J2-10

J1-12

RED

J2-1

BRUSHACTUATOR2
J1-14

POT. 100K OHMSPEEDLIMIT

Wheel Drive System

FIGURE 3

WHEEL DRIVE SYSTEM

BLK

A1 Speed Control
Pin Connection

KSI

4.7K

BLK

POT WIPER
POT HIGH

S5
1

4
13

R1 Speed Limit
100K Ohms

POT LOW

WHT
BRN

BLK

This drawing shows additional controller input circuit detail. The R1 speed limit pot is shown at its maximum speed
setting, with the wiper pin #18 shorted to the pot high pin #3

A2 Speed Controller Pin Key Detail
PIN#
1
2
3
4
5

WIRE COLOR
Blk/Vio
Blu/Vio
Brn & Red/Vio

Red/Blk

7
8
9
10
11
12
13
14
15
16
17
18

Orn/Blu
White/Vio
Blu/Blk
Grn/Vio
Orn/Vio

CONTROLLER DESCRIPTION and FUNCTION
Open - not used
Open - not used
Throttle Pot R1 pot high input (+) 5V ref
Throttle Pot R1 pot wiper input
KSI (key switch input): Battery (+) powers up controller logic circuits.
Brake Auxiliary Driver: Battery (-) output to main controller (A1), to turn on (activate) all auto scrub
functions (its open when in neutral).
Open - not used
Open - not used
Status Fault: Speed controller fault output to main control panel fault indicator light (Regular Scrub On).
Open - not used
Open - not used
Open - not used
Throttle Pot R1 pot low input (-)
Open – not used
Open - not used
Reverse/Horn output to A1 controller board to control solution solenoid (L1)
Reverse Directional Input: Battery (+) signal active with S5 closed
Speed limit pot input connection.

56 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Wheel Drive Troubleshooting guide
Problem
No wheel drive in Forward or Reverse

Possible Cause
• Wheel drive motor circuit breaker (F3) tripped (reset 30A circuit breaker).
• Control circuit breaker (F2) tripped (reset 5A circuit breaker).
• Defective S6 & S7 palm drive switches and or circuit wiring (repair or
replace).
• Defective A2 speed control, replace.
• Defective M1 wheel drive motor (repair or replace).

No wheel drive in reverse only

•
•

Defective S5 reverse directional switch or circuit wiring (repair or replace).
Speed control can’t change electrical polarity to wheel motor. Replace the
A2 speed control.

No variable wheel drive speed (will run @ its slowest
speed only).

•

Defective R1 speed limit potentiometer, test for an open in both the pot
and circuit wiring (repair or replace).

Operator control panel displays error 03 fault code

•

Speed controller has sensed an operational error code fault. See Drive
Status LED fault codes (table 1) in the Electrical System section.

Additional wheel drive circuit information
Control circuit pin connection test speciication data
Circuit Function Test
Test for forward throttle input:
• W/key on check pin#13 to pin #4 with palm drive switches open.
• W/key on check pin#13 to pin #4 with palm drive switches closed.
Test for R1 speed limiting pot input:
• W/key on check the R1 Min speed input voltage signal pin#13 to
pin#18. Note: Have the R1 pot knob turned fully CCW.
• W/key on check the R1 Max speed input voltage signal pin#13 to
pin#18. Note: Have the R1 pot knob turned fully CW.

57 - FORM NO. 56043162 - Focus II Large

Correct Circuit Test Values
•
•

.578 DCV
4.12 DCV

•

0 VDC

•

5 VDC

Wheel Drive System

Removal and Installation
Drive Motor Transaxle Removal
1

Turn the key switch off and disconnect the battery pack
Warning! Disconnect the battery pack before servicing machine.
Warning! Never work under machine without safety stands or blocking to support the machine.

Drain both the solution and recovery tanks and remove the squeegee.

Remove the Scrub deck by following the instructions in the Scrub Brush Deck Removal section in this manual

Block the rear of the machine See Figure 4 for correct placement of the wood blocking

FIGURE 4

58 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Drive Motor Transaxle Removal (continued)
Service Note: You may ind it easier to loosen the wheel Nuts (A) slightly when the wheels are still on the ground
and before you jack up the machine.
5.

See Figure 5. Jack the front of the machine from this location until the drive wheels are approximately 1” off
the ground

Remove the (6) wheel Nuts (A) and remove the (2) Drive Wheels (B) from the Motor Transaxle (D)

Disconnect the drive motor wiring connector

Remove the (4) Motor Mount Bolts and Nuts (C), and the two Transaxle Mount Plates (E) and carefully slide
the Motor Transaxle (D) away from the machine

Reinstall the Motor Transaxle (D) by following the above steps in reverse order Note that the tapered ends of
the wheel Nuts (A) go against the Drive Wheels (B)

FIGURE 5

59 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Drive Wheel Removal
1

Remove the squeegee.

Place wood blocking in the front and rear of the Drive Wheel (F) opposite of the one that you are removing to
prevent the machine from rolling

Service Note: You may ind it easier to loosen the wheel Nuts (G) slightly when the wheel is still on the ground and
before you jack up the machine.
4

Using a scissors jack, raise the machine until the Drive Wheel (F) is off the ground See Figure 6 for jack
placement

Remove the (3) wheel Nuts (G) and Drive Wheel (F)

Reinstall the Drive Wheel (F) by following the above steps in reverse order Note that the tapered ends of the
wheel Nuts (G) go against the Drive Wheels (F)

FIGURE 6

60 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Testing the Palm Drive Buttons
1.

See Figure 7. Disconnect the Handle Harness (H) from the mating connector located to the left of the squeegee
raise/lower handle

See Figure 8. Use a continuity checker or ohmmeter to check the continuity between pins 4 and 6 on the
Handle Harness (H) When the palm drive buttons are working correctly:
• The circuit through pins 4 and 6 should be open when both palm drive buttons are released
• The circuit through pins 4 and 6 should be closed (approximately zero ohms) when either of the palm drive
buttons is pressed

See Figure 7. When you’re done checking the palm drive buttons, reconnect the Handle Harness (H) to the
connector on the machine

FIGURE 7

FIGURE 8

61 - FORM NO. 56043162 - Focus II Large

Pin 1
Pin 2
Pin 3

Wht
Orn
Red

Pot Low
Pot Wiper
Rev Sw

Pin 4

Blk

Pot High L&R Palm Sw

Pin 5
Pin 6

Grn
Blu

Rev Sw
L&R Palm Sw

Wheel Drive System

Palm Drive Button Replacement
Note: It’s recommended that you empty the Recovery Tank before replacing a Palm Drive Button.
1.

See Figure 7. Remove the (2) Phillips Flat Head Screws (I) and remove the Palm Switch Assembly (J) from
the Handle (K)

See the detail in Figure 7. Remove the (2) Phillips Pan Head Screws (L) and Flat Washers (M) and remove
the Palm Button Switch (N) and (2) Switch Springs (O) from the Palm Switch Housing (P) Be careful not to
lose the Switch Springs (O)

Remove the Retaining Nut (Q) and Star Washer (R) from the SPST Momentary Switch (S), then remove the
SPST Momentary Switch (S) and the other (2) Star Washers (T) from the Palm Switch Housing (P)

Pull the Drain Hose out of the brackets to access the 5/16”-18 Hex Head Screws (U & Z)

Disconnect the Handle Harness (H) from the mating connector located to the left of the squeegee raise/lower
handle. (This will prevent excessive pulling or stress on the Handle Harness (H) and connector when the
Handle (K) is swung down to remove the Access Plate (V) )

Loosen the bottom left- and right-hand 5/16”-18 Hex Head Screws (Z) holding the Handle (K) to the machine

Remove the top left- and right-hand 5/16”-18 Hex Head Screws (U) holding the Handle (K) to the machine, then
swing the Handle (K) down to allow access to the bottom Phillips Pan Head Screw (W) holding the Access Plate
(V)

Remove the (2) Phillips Pan Head Screws (W) and remove the Access Plate (V) and attached Access Panel
Gasket (X) from the Handle (K)

Note the wire colors and connector locations, then disconnect the SPST Momentary Switch leads from the
connectors in the access area and remove the old SPST Momentary Switch (S) Note that you may need to cut a
cable tie to access the wires and connectors

10 Thread the leads from the replacement SPST Momentary Switch (S) into the side of the Handle (K) and to the
access area, then plug them into the corresponding connectors Replace the cable tie if necessary
11 Reinstall the Access Plate (V) and attached Access Panel Gasket (X) onto the Handle (K), then reinstall and
tighten the (2) Phillips Pan Head Screws (W)
12 Swing the Handle (K) back up into position, reinstall the top left- and right-hand 5/16”-18 Hex Head Screws
(U), then tighten the bottom left- and right-hand 5/16”-18 Hex Head Screws (Z)
13 Install the (2) Star Washers (T) onto the SPST Momentary Switch (S), then fasten the SPST Momentary Switch
(S) to the Palm Switch Housing (P) with the remaining Star Washer (R) and Retaining Nut (Q)
14 Reassemble the Palm Button Switch (N) and (2) Switch Springs (O) to the Palm Switch Housing (P), then
reinstall the (2) Phillips Pan Head Screws (L) and Flat Washers (M) Check the function of the Palm Button
Switch (N) to make sure the Switch Springs (O) are assembled correctly
15 Reassemble the Palm Switch Assembly (J) to the Handle (K), then reinstall and tighten the (2) Phillips Flat
Head Screws (I)
16 Reconnect the Handle Harness (H) to the connector on the machine
17 Snap the Drain Hose back into the brackets.
18 Check the machine drive functions (forward, reverse, speed control) to make sure the controls are working
correctly

62 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Testing the Reverse Button
1.

See Figure 9. Disconnect the Handle Harness (H) from the mating connector located to the left of the squeegee
raise/lower handle

See Figure 8 Use a continuity checker or ohmmeter to check the continuity between pins 3 and 5 on the
Handle Harness (H) When the reverse button is working correctly:
• The circuit through pins 3 and 5 should be open when the reverse button is released
• The circuit through pins 3 and 5 should be closed (approximately zero ohms) when the reverse button is
pressed

See Figure 9. When you’re done checking the reverse button, reconnect the Handle Harness (H) to the
connector on the machine

FIGURE 9

63 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Reverse Button Replacement
1 Turn the key switch off and disconnect the battery pack
Note: It’s recommended that you empty the Recovery Tank before replacing the Reverse Button.
2

Pull the Drain Hose out of the brackets to access the 5/16”-18 Hex Head Screws (U & Z)

Loosen the bottom left- and right-hand 5/16”-18 Hex Head Screws (Z) holding the Handle (K) to the machine

Remove the (2) Phillips Pan Head Screws (W) and remove the Access Plate (V) and attached Access Panel
Gasket (X) from the Handle (K)

Note the wire colors and connector locations, then disconnect the leads on the reverse button SPST Momentary
Switch (Y) from the connectors in the access area Note that you may need to cut a cable tie to access the wires
and connectors

Remove the old reverse button through the top of the Handle (K)

Insert the leads from the replacement reverse button SPST Momentary Switch (Y) through the hole in the top
of the Handle (K) and to the access area, then carefully press the new reverse button into the Handle (K)

10 Plug the leads from the reverse button SPST Momentary Switch (Y) into the corresponding connectors Replace
the cable tie if necessary
11 Reinstall the Access Plate (V) and attached Access Panel Gasket (X) onto the Handle (K), then reinstall and
tighten the (2) Phillips Pan Head Screws (W)
12 Swing the Handle (K) back up into position, reinstall the top left- and right-hand 5/16”-18 Hex Head Screws
(U), then tighten the bottom left- and right-hand 5/16”-18 Hex Head Screws (Z)
13 Reconnect the Handle Harness (H) to the connector on the machine
14 Snap the Drain Hose back into the brackets.
15 Check the machine drive functions (forward, reverse, speed control) to make sure the controls are working
correctly

64 - FORM NO. 56043162 - Focus II Large

Wheel Drive System

Testing the Speed Limit Control Potentiometer
1.

See Figure 9. Disconnect the Handle Harness (H) from the mating connector located to the left of the squeegee
raise/lower handle

See Figure 8 Use an ohmmeter on pins 1 and 4 to check the total resistance of the potentiometer If the
potentiometer is working correctly, the resistance across pins 1 and 4 should measure approximately 100K
ohms

Use an ohmmeter to measure the resistance across pins 2 and 4 If the potentiometer is working correctly:
• The resistance across pins 2 and 4 should measure 100K ohms with the Speed Limit Control Knob rotated all
the way counterclockwise (slow speed)
• The resistance across pins 2 and 4 should measure close to zero ohms with the Speed Limit Control Knob
rotated all the way clockwise (fast speed)
• The resistance values across pins 2 and 4 should change proportionately between 100K ohms to zero ohms as
the Speed Limit Control Knob is rotated between slow and fast speed Note that any “dead spots” or spikes in
the resistance values could indicate a problem with the potentiometer

See Figure 9. When you’re done checking the speed limit control potentiometer, reconnect the Handle Harness
(H) to the connector on the machine

Speed Limit Control Potentiometer Replacement
1

Turn the key switch off and disconnect the battery pack

See Figure 9. Loosen the setscrew in the Knob (AA), then remove the Knob (AA) from the Potentiometer (AB)
shaft

Pull the Drain Hose out of the brackets to access the 5/16”-18 Hex Head Screws (U & Z)

Loosen the bottom left- and right-hand 5/16”-18 Hex Head Screws (Z) holding the Handle (K) to the machine

Remove the (2) Phillips Pan Head Screws (W) and remove the Access Plate (V) and attached Access Panel
Gasket (X) from the Handle (K)

Note the wire colors and connector locations, then disconnect the three Potentiometer leads from the connectors
in the access area Note that you may need to cut a cable tie to access the wires and connectors

Note the position of the Potentiometer (AB) in the Handle (K), then remove the retaining nut and star washer
and remove the old Potentiometer (AB) from the Handle (K)

10 Insert the leads from the replacement Potentiometer (AB) through the hole in the front of the Handle (K) and
to the access area, then plug them into the corresponding connectors Replace the cable tie if necessary
11 Install the new Potentiometer (AB) into the Handle (K), then reinstall the star washer and retaining nut
12 Reinstall the Access Plate (V) and attached Access Panel Gasket (X) onto the Handle (K), then reinstall and
tighten the (2) Phillips Pan Head Screws (W)
13 Swing the Handle (K) back up into position, reinstall the top left- and right-hand 5/16”-18 Hex Head Screws
(U), then tighten the bottom left- and right-hand 5/16”-18 Hex Head Screws (Z)
14 Reinstall the Knob (AA) onto the Potentiometer (AB) shaft, then tighten the setscrew

65 - FORM NO. 56043162 - Focus II Large

Wheel Drive System
15 Check the position of the gray indicator on the Knob (AA) with the Potentiometer (AB) set to both the full
clockwise (fast) and full counterclockwise (slow) positions Readjust the rotational position of the Knob (AA) on
the Potentiometer (AB) shaft as necessary to center the indicator to the Handle (K)
16 Reconnect the Handle Harness (H) to the connector on the machine
17 Snap the Drain Hose back into the brackets.
18 Check the machine drive functions (forward, reverse, speed control) to make sure the controls are working
correctly

66 - FORM NO. 56043162 - Focus II Large

Electrical System

Electrical System
Wiring (Ladder) Diagram
(OPTIONAL)

ONBOARDBATTERY
CHARGER

NOTE: CONNECT GRNWIRE TOF2 ANDDISCONNECT
REDWIRE FROMF2 FORCHARGEROPTION

F2
1

F1
1

B+

BLK/WHT

B-

BT1

RED

INTERLOCK

RED
2

CIRCUIT BREAKER, 5 AMP
RED

RED

GRN

FUSE, 150 A.

BLK

BATTERY

36 VDC
A1
CONTROL BOARD

F2
BRN

RED
1
2
CIRCUIT BREAKER, 5 AMP

BRN
BRN

J2-7

B+2

VIO/BLK

J1-14

BRUSHCONTACTOR

J2-8

VIO/YEL
M
WHT/GRN
MOTOR, BRUSHACTUATOR

J2-4

GRA/WHT

J2-1

BRUSHACTUATOR2

BRUSHACTUATOR1

COIL, BRUSHMOTORCONTACTOR
BRN

BRN

BLK/YEL

J1-12

RECOVERY TANK FULL

SOLUTIONSOLENOID

WHT/YEL

J2-5

B-1
B-2
B-3
B-4

BORN/BLU
RED/BLK
BLU/BLK

PIN9 - STATUS
PIN6 - BRAKE (-)
PIN16 - REV

BRN/BLK

BRN
RED/VIO

PIN5 - KSI

M1
-

GRN/VIO

PIN17 - REV

YEL/RED

100 OHM

BLU/VIO

PIN4 - POT.WIPER

MOTOR, WHEEL DRIVE

BLK

GRN

BLK

BLU

S5
S5
1
2

BLK

BLK/VIO

BLK

PIN18 - SPEEDLIMIT POT
PIN13 - POT.LO

ORN/VIO

ORN

BRN

WHT/VIO
R2

WHT

S6
S6
1

PIN3 - POT.HI

RED

S7
S7
1

2
3

B+
A2

POT. 100K OHMSPEEDLIMIT

K1
K1

WHT

BLK

WHT/GRA

4.75K OHM

RED

BLK

MOTOR, RIGHT BRUSH
M4
MOTOR, VAC
K2
K2

BLU

67 - FORM NO. 56043162 - Focus II Large

BLK

ORN

MOTOR, LEFT BRUSH
M3
+
WHT
BLK
M

RED

J1-7
J1-9
J2-9
J2-6

BLK
BLK
BLK
BLK

BLK

CIRCUIT BREAKER, 30 AMP

1228 SPEEDCONTROLLER

BLK

WHT/GRA
ORN

MOTOR, CHEMICAL PUMP
F3
RED

FOR/REV.

ORN/BLU
RED/BLK
BLU/BLK

YEL/VIO

REVERSE

STATUS

J2-11

M6
+ M

BRN

B+1

J1-6

J1-13

J1-5

BRN

J1-4

BRN
SW, SPST KEY

PUMP

S3
BRN

CHEMICAL

COIL, SOLUTIONSOLENOID

VACUUM MOTOR SENSE

J1-11

BRUSH MOTOR SENSE

RED/GRN

J2-10

L1
1

SWITCH, FLOAT

COIL, VACMOTORCONTACTOR
BRN

VACUUMCONTACTOR

BLK

14
13
12
11
10
9
8

BLK 16-2

12
11
10
9
8
7

YEL/VIO 18-1
ORN 18-1
BLK 18-4
WHT/GRN 18-1
BRN 16-8

6
5
4
3
2
1

BLK 18-5
WHT/GRA 18-1
GRA/WHT 18-1
VIO/YEL 18-1

GRN/YEL 18-3

X6
CONTROL BOARD BONDING

BRN/BLK 10-1
BLK 10-3
A2
SPEED CONTROLLER

ORN/VIO 20-1
R3

BLU/BLK 20-1
WHT/VIO 20-1

2 GRN/VIO 20-2

1
100 OHM
R2

1
4.75K OHM

ORN/BLU 20-1
RED/BLK 20-1
BRN 20-1
RED/VIO 20-1
BLU/VIO 20-1
BLK/VIO 20-1

18 18
SPEED LIMIT POT
17
REVERSE
16
HORN
15
BDI
14
BRAKE+
13
POT LOW
12
INHIBIT
11
B+
10
B+
9
STATUS
8
MODE(M1, M2)
7
PUSH
6
BRAKE5
KSI
4
POT WIPER
3
POT HIGH
2
B1 1 BX19

1
2
SW, SPST KEY

B-

PROGRAMMER

X38
1

ORN/VIO 20-1

P2
GRN/VIO 20-1

WHT/VIO 20-1
BRN 16-1
BRN 20-1

BRN 16-7
BRN 16-8

BLK 18-6
BLU/BLK 20-1
RED/BLK 20-1
ORN/BLU 20-1

7
6
5
4
3
2
1

X39
1

WHITE

ORANGE

RED/VIO 20-1

RED

BLK/VIO 20-1

BLACK

GRN/VIO 20-1

GREEN

BLU/VIO 20-1

BLUE

WHITE
BROWN
BLACK

1
2
3

BLACK

S5
REVERSE SWITCH

BLACK

2
BLACK

1
S6
RIGHT PALM SWITCH

BLACK

M1
BLACK

R1
POT. 100K OHM SPEED LIMIT

1
S7
LEFT PALM SWITCH

BLACK

2 4
1 3

B+

WHT/YEL 10-1
YEL/RED 10-1

GRN/YEL 18-1
GRN/YEL 18-2

X1
PANEL BONDING

BLU 12-1
RED 10-2

1
BRN 16-7
BRN 16-2
BRN 16-3

M5
MOTOR, BRUSH ACTUATOR

WHT/GRN 18-1

X11
B

X12
B

BLK

VIO/YEL 18-1

RED

K2
CONTACTOR, VACUUM MOTOR
BLK/YEL 18-1

M3
MOTOR, RIGHT BRUSH

RED 10-3
WHT 12-1
WHT 12-2

M2
MOTOR, LEFT BRUSH

B A
BRN 16-3
BRN 16-6
BRN 18-1

X45
X48

X46

B A

WHT 12-2

B A

BLK 12-3

VIO/BLK 18-1
GRN

BLK 12-4

INTERLOCK

WHT 12-1
BLK 18-1
BLK 18-5
BLK 18-4
B+

B-

BLK 10-3

5
2

BLK 18-6
BLK 10-2
BLK 12-2

4
3

5 A. CIR. BR.

BLK 4-2

1
2 TERMINAL BLOCK, (-)
X5

TO X4 TERMINAL BLOCK (+)
BLK 16-2

NOTE: DISCONNECT RED 16-1
WIRE FROM F2 AND CONNECT
GRN WIRE TO F2

BLK 4-1
X10
(-)

(-)

BRN 16-6

X60 X61
A
A

RED/GRN 18-1

BLK 12-1

X15
B

X16
B

BLU 12-1

L1
COIL, SOLUTION SOLENOID

BT1
36V BATTERY

(+)
+

(+)

RED 4-1
M6
MOTOR, CHEMICAL PUMP

BLK 18-1

BRN 16-2

M4
MOTOR, VAC

SP3
2
1
2

SP2
1

1
2

BLK 12-3

BLK 12-4

YEL/RED 10-1

X3
GRN/YEL 18-3
1
2
GRN/YEL 18-2
CIR BREAKER PANEL BONDING

A B

BLK 10-2

WHT/YEL 10-1

BRN/BLK 10-1

X2
CHASSIS BONDING
2
1

YEL/VIO 18-1

X17

BRN 18-1

A B

30 A. CIR. BR.
WHEEL DRIVE

F3
RED 10-1

WHT

1
2
5 A. CIR. BR.
CONTROLS

M1
MOTOR, WHEEL DRIVE

WHT/GRA 18-1

X24

BLK 12-1

RED 4-2

F1
FUSE, 150 A.

GRA/WHT 18-1
RED 16-1

X25

BLK 12-2

ORN 18-1

BLK

RED 16-1
RED 10-2
RED 10-1

S4
RECOVERY TANK FULL SWITCH
2
1

BATTERY DISCONNECT

X4
2 TERMINAL BLOCK, (+)

RED 10-3

GRN/YEL 18-1

TO B- ON BATTERY PACK

B A
X47

K1
CONTACTOR, BRUSH MOTOR

OPTIONAL ONBOARD CHARGER

Electrical System

J1
VIO/BLK 18-1
BRN 16-1
BLK/YEL 18-1
RED/GRN 18-1

Wiring Harness Diagram 56315926 Rev. C

68 - FORM NO. 56043162 - Focus II Large

A1
CONTROL BOARD

Electrical System

Batteries
Description of the Low Voltage Cut-Out Feature
All models discussed in this manual are equipped with a low voltage cut-out feature to prevent over-discharging of the batteries. When a machine’s
battery pack voltage falls below speciically deined thresholds (voltage settings), the scrub system is automatically shut down. The cut-out level is
adjustable. The standard lead-acid battery (wet cell) setting is 31.34 volts or 1.74 volts per cell. The alternate maintenance free battery (gel cell)
setting is 32.63 volts or 1.81 volts per cell. The standard setting is factory-selected and should be used unless the battery manufacturer speciies the
higher cut-out voltage.
Special Service Note: There is a minimum battery charge level that the must be reached before the low-voltage cut-out function will reset and allow
the machine to function again. On the 34 RST, the batteries must be charged to a minimum of 37.6 volts (2.09 volts per cell) in order to reset the lowvoltage cut-out function.

Description Of The Battery Condition Indicators
The Battery Condition Indicator will give an indication of the state of charge of the batteries based on the voltage of
the batteries The display has three colored LED’s (J1) showing 5-levels of voltage. When the low-voltage cutout is
active, the red LED will lash. These levels are summarized in the tables below.
Display
LEDs On

Standard

Alternate

Grn

34.0+

34.5+

Grn & Yel

33.0-34.0

34.0-34.5

Yel

32.0-33.0

33.5-34.0

Yel & Red

31.5-32.0

33.0-33.5

Red

31.0-31.5

32.5-33.0

Flash Red

<31.0

<32.5

Specific Wet Cell Battery Information
Wet Cell Battery Speciications
• Use a combination of multiple two-volt cell units to construct a 36-volt DC battery pack system.
• Clarke recommended battery pack capacity is a 305 AH @ 20 Hour Rate deep cycle battery system. Note: The
battery pack must it the battery compartment size listed in Speciications
Wet Cell Battery Charger Speciications
• Use a 36-volt DC output charger matching the DC battery pack voltage and the input AC line voltage supply
being used
• When selecting a battery charger always follow the recommendation of the battery supplier to match the correct
charger DC output amperage to the amp/hour rating of the batteries being installed This will prevent the
battery pack from being overcharged or undercharged
• The recommended 305 AH battery should be matched to a 36-volt, 20-25 amp output charger on machines using
(six) 6V batteries.

69 - FORM NO. 56043162 - Focus II Large

Electrical System

Battery Maintenance
Charging Batteries
Charge the batteries each time the machine is used or when the battery indicator (1 or 3) is reading less than full
Note: Refer to the algorithm chart in Advance Technical Service Bulletin TSBUS2008-984 for the correct charging
algorithm for your battery type and model.
Caution!
• Charge batteries in a well-ventilated area.
• Do not smoke while servicing the batteries.
• Remove all jewelry
• Wear safety glasses, rubber gloves and a rubber apron
• Do not allow tools to touch more than one battery terminal at a time
• To avoid damage to floor surfaces, wipe water and acid from the top of the batteries after charging.
If your machine shipped with an onboard battery charger, turn
the Key Switch off Unwind the electrical cord from the side of the
onboard charger and plug it into a properly grounded outlet Refer to
the OEM product manual for more detailed operating instructions
If your machine uses an external battery charger, unplug the battery
connector (4) from the machine connector (5), and plug the battery
connector into the charger Follow the instructions on the battery charger
Note: Make sure you plug the battery charger into the connector (4) with the
handle attached to it.

Extending Battery Life
Proper maintenance of electric vehicle batteries can greatly extend their life. The following information will help
extend the life of your batteries.
• Your battery will deliver superior performance and life if it is recharged properly. Excessive charging or
discharging will shorten battery life and limit performance Be sure to follow proper charging instructions
• Make sure you have an appropriate charger for the type of battery. Use only “voltage-regulated” or “voltagelimited” chargers. Standard constant-current or taper current chargers must not be used. A temperature-sensing
charger is recommended
• Important! Do not attempt to open sealed gel batteries or add water Doing so will damage the battery and void
the warranty
• For wet batteries, maintain proper electrolyte level and check weekly Use distilled water in batteries whenever
possible If the batteries are discharged, add just enough water to cover the plates in each cell, and recheck the
level after charging (this prevents over-illing the battery). If batteries are fully charged, ill each cell to the
bottom of the iller tube. Do not over-ill the batteries! Do not add acid to batteries!
• Keep the Batteries Charged Batteries should be charged each time that a machine is used for more than 1 hour
Machine operators should open the battery compartment cover for charging, to avoid a concentrated build-up of
hydrogen gas. Operators should follow the instructions provided with their speciic battery charger, to determine
how long the batteries should be charged Even when a machine is stored, the batteries should be charged once
a month to prevent the batteries from “sulfating” Most battery caps are vented, so there’s no need to loosen or
remove them for charging
• Keep the Batteries Clean Use a damp cloth to wipe dirt from the top of the batteries Battery terminals must be
clean and tight. If the tops of the batteries are wet after charging, the batteries have probably been overilled or
over-charged. Note: If there is acid on the batteries, wash the tops of the batteries with a solution of baking soda
and water (2 tablespoons of baking soda to 1 quart of water).

70 - FORM NO. 56043162 - Focus II Large

Electrical System

Removal and Installation
Caution!
• Use extreme caution when working with batteries. Sulfuric acid in batteries can cause severe injury if
allowed to contact the skin or eyes.
• Explosive hydrogen gas is vented from the batteries through openings in the battery caps. Do not smoke
while servicing the batteries.
• Remove all jewelry. Wear safety glasses, rubber gloves and a rubber apron
• Do not allow tools to touch more than one battery terminal at a time
• Electrical components in this machine can be severely damaged if the batteries are not installed and
connected properly.
1
2
3

Turn the Key Switch to the off position and open the recovery
tank
Remove the cables from the batteries, and remove the
batteries Make note of the battery polarity and cable locations

BAT+
BAT-

−
−

Install the new batteries into the compartment Note the
orientation of the batteries shown to the right Not all of the
batteries are oriented the same way
Put a rubber boot over each end of the battery cables

Connect the battery cables

−
−

• There are 3 short cables (S), 2 long cables (L), and the main
positive (Bat+) and negative (Bat-) cables leading to the
machine

−

+
+
S

−

• All cables are connected positive-to-negative for a series
connection between all 6 batteries
• Position the cables so the battery caps can be easily removed
for battery service
• Take care to not over torque the cable connector, as this may damage the battery post.
6

Coat the terminals with spray-on battery terminal coating (available at most auto parts stores).

Put one of the black rubber boots over each of the terminals and connect the Battery Pack Connector (14 or 18)

Battery Testing
A battery problem is usually recognized by the machine operator as a decrease in the machine’s running time This
condition is usually caused by one or more “dead cells” in the battery system
There are 2 ways to ind a dead cell:
• Use a hydrometer to check the speciic gravity (or “state of charge”) of the luid in each cell. A dead cell is one that
reads 50 points (or more) lower than the other cells
• Use a volt meter to check the voltage of each battery Look for a battery with a voltage that is 1 or 2 volts less
than the other batteries Check under the following conditions:
• With the batteries fully charged,
• With the scrub and drive motors running,
• With the batteries discharged, but still above the voltage cutoff threshold
If the batteries in the machine are more than 1 year old, it’s usually best to replace the whole set, rather than
replacing just one battery

71 - FORM NO. 56043162 - Focus II Large

Electrical System

Maintenance and Adjustment
Lift Actuator Limit Adjustment
To protect the lift actuator from traveling too far, it contains
two internal limit switches for minimum and maximum
travel The minimum travel is adjusted by turning the
leadscrew nut, and the maximum travel (or length) is
adjusted by turning the dial at the top of the leadscrew motor
This adjustment requires the use of the Actuator Power Cord
Adapter (1) (PN 56407502) shown to the right

Motor
Battery
Negative

Remove the front nose from the machine

Connect the Power Cord Adapter (1) to the positive and
negative battery terminals of the machine

For/Rev
Switch

Battery
Positive

Disconnect the power cable of the lift actuator from the
machine, and connect the Power Cord Adapter into the
cable leading to the lift actuator motor

Press the For/Rev switch on the Adapter (1) to lower the lift actuator until the scrub deck is resting on the loor
in a neutral position (no tension/pressure on the actuator)

Remove the retaining key (2) and link pin (3) that
secures the spring housing (4) to the scrub deck to permit
the actuator to swing freely

While holding the spring housing (4) from turning, press
the For/Rev switch on the Adapter (1) to raise the spring
housing (4) toward the actuator gear housing (5) until
the motor stops (minimum limit switch engaged)

4
2

Rotate the spring housing (4) until the distance between
the spring housing and gear housing (5) is within the
Upper Limit range listed in the table below
• The “Old Style” spring housing (4) is identiiable as a
one-piece housing.

• The “New Style” spring housing (4) is identiiable as
split down the center
Housing
Distance

4
Housing Distances
Upper Limit

Lower Limit

New Style

13/16" - 15/16"
(21 - 23 mm)

4 7/8" - 5"
(124 - 127 mm)

Old Style

1/16" - 3/16"
(2 - 5 mm)

4 1/8" - 4 4"
(105 - 108 mm)

Hold the spring housing from rotating, and press the For/Rev button of the Adapter (1) to lower the actuator to
its lowest position until the motor stops (maximum limit switch engaged).

Measure the Housing Distance as described above, but for the Lower Limit position, and compare this to the
values shown in the table If necessary, adjust the lower limit as described below

72 - FORM NO. 56043162 - Focus II Large

Electrical System

9
6

8
7

10 Remove the dust cap (6) from the top of the gear housing (5) using your ingers or a small screw driver.
11 Place a 1/2” socket (9) over the limit adjustment nut (7) to turn the nut, and increase or decrease the lower limit
as follows:
• Important: Even though the center of the adjustment nut looks like it
will accept a screwdriver blade, this is the retainer for the adjustment
nut Do Not try to turn the retainer!

Turn Outer
Nut Only

• Each “click” of the adjuster nut changes the Housing Distance by 1/16”.
• To increase the Housing Distance, turn the nut clockwise.
• To decrease the Housing Distance, turn the nut counterclockwise.

Do Not
Turn!

• If you need to make large adjustments, it is recommended to move the
actuator away from its limit position irst.
12 To check your adjustments, you must irst raise the actuator away from
the limit position before lowering it back to the limit position and remeasuring the Housing Distance for the Lower Limit.
13 After adjusting the Lower Limit, it is a good practice to conirm both
limits by cycling the actuator to the upper and then lower limit
14 Before disconnecting the Adapter cord (1), lower the lift actuator down to the scrub deck to make it easier to
reinsert the link pin (3) and retaining key (2)
15 Reassemble the machine

73 - FORM NO. 56043162 - Focus II Large

Electrical System

Curtis Controller Diagnostics
Diagnostics Method A: Uses the machine’s LED display and the Regular Scrub ON indicator.

Function of the Speed Controller Status Light and Display

The Curtis 1228 speed control will output a fault code if there is a problem
associated with the speed control and wheel drive system When the Curtis
controller presents an error to the main controller, the display will indicate an “E03” error designated as a drive
controller error The single character display (J2) will lash out E...0...3 to indicate a drive controller error.
When a Drive controller error code is present, the status indicator will lash a speciic error code
sequence until the fault is corrected. For Standard models, this is the Scrub On indicator (I1)
See the Drive Status LED Fault Codes Table 1 below for a description of these drive fault code
indicators
Service Note: How to read the LED drive fault error code indicators: For example, OO O = two light lashes, a short pause, one
lash, then a long pause. The code will then be repeated. This indicates the fault error code 2,1.

Diagnostics Method B: Uses the optional handheld Curtis programmer model 1311 MP1101.

Diagnostics Using the Curtis Handheld Programmer
Note: Also refer to the Curtis Programmer Manual, Clarke form number 56043101, for more details on programmer operation.
With a Curtis programmer, diagnostics and troubleshooting is more direct than with the LEDs alone The
programmer presents complete diagnostic information in plain language with no codes to decipher Faults are
displayed on the “Faults” screen, and the status of the controller inputs/outputs is displayed on the “Monitor”
screen. The following four-step process is generally used for diagnosing and troubleshooting an inoperative vehicle:
(1) visually inspect the vehicle for obvious problems; (2) diagnose the problem using the programmer; (3) test the
circuitry with the programmer, and (4) correct the problem Repeat the last three steps as necessary until the
vehicle is operational
Example: A vehicle that does not operate in “forward” is brought in for repair.
1
2

Examine the vehicle and its wiring for any obvious problems such as broken wires or loose connections.
Connect the programmer, navigate to the “Faults” screen, then read the displayed fault information In this
example, the display shows “”, indicating that the controller has not detected anything out
of the norm
Navigate to the “Monitor” screen and observe the status of inputs and outputs in the forward direction In this
example, the display shows that the “THROTTLE” input did not toggle from 0% to 100% when a palm drive
switch was pressed, which means there is a problem with the palm drive switches or the palm drive switch
wiring
Check and replace/repair the palm drive switches and wiring, then repeat the test If the programmer shows
the palm drive switch circuit closing and the vehicle now drives normally, the problem has been corrected

Fault History
The handheld programmer can be used to access the controller’s fault history ile. Connect the programmer, then
navigate to the “FAULTS”/“Fault History” screen. The programmer will display all the faults that the controller
has experienced since the last time the fault history ile was cleared. The faults may be intermittent faults, faults
caused by loose wires, or faults caused by operator errors. Faults such as HPD or over-temperature may be caused
by operator habits or by overloading After a problem has been diagnosed and corrected, it’s advisable to clear the
fault history ile. This allows the controller to accumulate a new ile of faults. By checking the new fault history
ile at a later date, you can readily determine whether the problem was indeed completely ixed. To clear the fault
history ile, navigate to the “FAULTS”/“Clear Fault History” screen. The programmer will display the message “You
are about to clear Fault History/Continue?
• To clear the fault history, press the “+” (YES) key. The programmer will display the message “Deleted”.
• If you decide not to clear the fault history, press the “-“ (NO) key. The programmer will return to the expanded “Faults” screen.

74 - FORM NO. 56043162 - Focus II Large

Electrical System

Drive Status LED Fault Codes
TABLE 1
LED
Code
1,1

0 0

over-/under-temperature cutback

1,2

0 00

throttle fault

1,3

0 000

speed limit pot fault

1,4

0 0000

battery voltage too low

1,5

0 00000

battery voltage too high

2,1
2,3

00 0
00 000

main contactor driver Off fault
main contactor fault

2,4
3,1

00 0000
000 0

main contactor driver On fault
fault present for >10 sec.

3,2

000 00

brake On fault

3,3

000 000

pre-charge fault

3,4

000 0000

brake Off fault

3,5

000 00000

HPD (High Pedal Disable) fault

4,1

0000 O

current sense fault

4,2

0000 00

motor voltage
failsafe)

4,3
4,4

Status Light
Display

0000 000
0000 0000

Explanation

EEPROM fault
power section fault

fault

Possible Cause
1.
2.
3.
1.
2.
3.
1.
2.
1.
2.
1.
2.
3.
1.
1.
2.
1.
1.
2.
1.
2.
1.
2.
1.
2.
1.

2.
1.
2.
(hardware 1.
2.
3.
1.
1.
2.
3.

Temperature >92°C or < -25°C.
Excessive load on vehicle.
Operation in extreme environments.
Palm drive switch wires open or shorted.
Palm switches defective.
Wrong throttle type selected.
Speed limit pot wire(s) broken or shorted.
Broken speed limit pot.
Battery voltage <17 volts.
Bad connection at battery or controller.
Battery voltage >48 volts.
Vehicle operating with charger attached.
Intermittent battery connection.
Main contactor driver failed open.
Main contactor welded or stuck open.
Main contactor driver fault.
Main contactor driver failed closed.
Broken palm drive switch.
Broken speed limiting pot.
Electromagnetic brake driver shorted.
Electromagnetic brake coil open.
Low battery voltage.
KSI and palm drive switch turned on at same
time.
Electromagnetic brake driver open.
Electromagnetic brake coil shorted
Incorrect sequence of palm drive switch and
KSI.**
Faulty or shorted palm drive switch.
Short in motor or in motor wiring.
Controller failure. *
Motor voltage does not correspond to throttle
request.
Short in motor or in motor wiring.
Controller failure. *
EEPROM failure or fault.
EEPROM failure or fault.
Short in motor or in motor wiring.
Controller failure. *

* Jack up vehicle and retest to conirm diagnosis. Clean connections, inspect system wiring, and retest.
**Note: A KSI (key switch input) system problem is a speciic HPD (high pedal disable) type operational fault caused by the operator activating palm
drive switch before turning on the main key switch. This can be cleared by releasing both palm drive switches and cycling the key switch OFF
and ON.

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Electrical System

Speed Control Programming Options

Following are the two speed control parameters that can be adjusted using a Curtis handheld programmer:
M1 MAX SPD – Forward Transport/Scrub maximum speed limit (% of full throttle)
M1 REV MAX SPD – Reverse Transport/Scrub maximum speed limit (% of full throttle)

Installation Checkout for the Curtis Speed Controller
After installing a controller and before operating the vehicle, carefully complete the following checkout procedure
If you ind a problem during the checkout, refer to the Curtis Controller Diagnostics section for further information
You can perform the installation checkout with or without the handheld programmer The checkout procedure is
easier with a programmer Otherwise, observe the yellow Regular Scrub ON or Wand indicator LED for codes The
Curtis handheld programmer part number is 56409441
The 1228 controller is inherently a high-power device. You must take the necessary safety precautions when
working around any battery-powered vehicle. These include, but are not limited to: proper training, wearing eye
protection, avoiding loose clothing and jewelry, and using insulated wrenches
• Put the vehicle up on blocks to get the drive wheels off the ground before beginning these tests
• Turn the key switch off and make sure that both palm drive switches are released
• Do not stand, or allow anyone else to stand, directly in front of or behind the vehicle during the tests
1

If a programmer is available, connect it to the programmer plug-in port.

Turn the key switch on The programmer should “power up” and display “Loading…” If neither happens, check
for continuity in the key switch circuit and controller ground

If you are using a programmer, navigate to the “Faults”/”System Faults” screen The display should read
“”.
• If there is a problem, the LED will lash a diagnostic code and the programmer will display a diagnostic
message If you are conducting the checkout without a programmer, look up the LED fault code in Table 1 in
the Electrical System section
• When the problem has been corrected, it may be necessary to cycle the key switch to clear the fault code

Press one of the palm drive switches The motor should begin to turn in the selected direction If it does not,
verify the wiring to the controller and to the motor The motor speed should correspond to the speed limit pot
setting If not, refer to Table 1 in the Electrical System section

If you are using a programmer, navigate to the “Monitor” screen. Scroll down to the “THROTTLE” and
“REVERSE INPUT” screens to observe the status of the palm switches and the reverse button Cycle each
switch in turn, observing the programmer Each input should show the correct state on the programmer

Take the vehicle off the blocks and drive it in an open area It should have smooth acceleration and good top
speed

Programming Vehicle Speed Changes
You can change the maximum M1 forward and reverse speeds electronically using the handheld programmer. To
change a speed parameter using the programmer, select the “Program” screen
• To change the maximum forward speed, navigate to the “Program”/ “M1 MAX SPD screen. Press the “+” or (-)
keys to increase or decrease the forward speed. Note that the speeds range from 0-100% and the factory setting
is 100%.
• To change the maximum reverse speed, navigate to the “Program”/ “M1 REV MAX SPD screen. Press the “+”
or (-) keys to increase or decrease the reverse speed. Note that the speeds range from 15-100% and the factory
setting is 55%.

Maintenance
There are no user-serviceable parts inside the Curtis PMC 1228 controller. No attempt should be made to open the
controller Opening the controller may damage it and will void the warranty It is recommended however that the
controller exterior be cleaned periodically. Note that if the handheld programmer is available, this periodic cleaning
provides a good opportunity to check the controller’s fault history ile.

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Clarke Focus Ii Large Walk Behind Floor Scrubber Service Manual

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