Multiquip Whisperwatt Series Dca 20Spx Users Manual Rev 2

WHISPERWATT SERIES DCA-20SPX Generators_portable_whisperwatt_DCA20SPX_rev_2_manual_DataId_19093_Version_1

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2015-02-09

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PARTS AND OPERATION MANUAL
OPERATION AND PARTS MANUAL

WHISPERWATTTM SERIES

MODEL DCA-20SPX
60 Hz GENERATOR
PARTS LIST NO. B1871302604

Revision #2 (04/14/10)
THIS MANUAL MUST ACCOMPANY
THE EQUIPMENT AT ALL TIMES.

PROPOSITION 65 WARNING

Diesel engine exhaust and some of

PAGE 2 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

NOTE PAGE

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 3

TABLE OF CONTENTS
MQ POWER DCA-20SPX
WHISPER
WATTTM GENERATOR
WHISPERW
California Proposition 65 Warning ..................................... 2
Table Of Contents ............................................................. 4
Parts Ordering Procedures ............................................... 5
Specifications ................................................................... 6
Dimensions (Top, Side, Front) ........................................... 7
Safety Message Alert Symbols .................................... 8-9
Rules for Safe Operation ........................................... 10-15
Generator Decals ....................................................... 16-17
Installation ................................................................. 18-19
General Information ........................................................ 20
Major Components ......................................................... 21
Generator Control Panel ................................................. 23
Engine Operating Panel ............................................. 24-25
Output Terminal Panel Familiarization ........................ 26-28
Load Application ............................................................. 29
Gauge Reading ............................................................... 30
Pre-Setup .................................................................. 31-34
Generator Start-up Procedure (Manual) ..................... 35-36
Generator Start-up Procedure (Auto Mode) .................... 37
Generator Shut-Down Procedure .................................... 38
Maintenance (Engine) ................................................ 39-41
Maintenance (Trailer) ................................................. 42-45
Trailer Wiring Diagram ..................................................... 46
Generator Wiring Diagram ............................................... 47
Engine Wiring Diagram ................................................... 48
Troubleshooting (Engine) ........................................... 49-50
Troubleshooting (Generator) ............................................ 51
Engine Controller Troubleshooting ................................... 52
Explanation of Code in Remarks Column ....................... 54
Suggested Spare Parts .................................................. 55

COMPONENT DRA
WINGS
DRAWINGS
Generator Assembly .................................................. 56-57
Engine Operating Panel Assembly ............................ 58-59
Control Box Assembly ............................................... 60-61
Engine and Radiator Assembly ................................. 62-65
Output Terminal Assembly ......................................... 66-67
Battery Assembly ...................................................... 68-69
Muffler Assembly ...................................................... 70-71
Fuel Tank Assembly .................................................. 72-73
Enclosure Assembly ................................................. 74-77
Rubber Seals Assembly ............................................ 78-79
Nameplate and Decals .............................................. 80-81
Terms and Condition of Sale — Parts ............................ 84

NOTE

Specification and part
number are subject to
change without notice.

PAGE 4 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

www.mqpower.com

PARTS ORDERING PROCEDURES
Ordering parts has never been easier!
Choose from three easy options:
Order via Internet (Dealers Only):

Best Deal!

Effective:
January 1st, 2006

If you have an MQ Account, to obtain a Username
and Password, E-mail us at: parts@multiquip.
com.

Order parts on-line using Multiquip’s SmartEquip website!
N View Parts Diagrams
N Order Parts
N Print Specification Information

To obtain an MQ Account, contact your
District Sales Manager for more information.

Use the internet and qualify for a 5% Discount
on Standard orders for all orders which include
complete part numbers.*

Goto www.multiquip.com and click on
Order Parts to log in and save!

Note: Discounts Are Subject To Change

Order via Fax (Dealers Only):
All customers are welcome to order parts via Fax.
Domestic (US) Customers dial:
1-800-6-PARTS-7 (800-672-7877)

Fax your order in and qualify for a 2% Discount
on Standard orders for all orders which include
complete part numbers.*
Note: Discounts Are Subject To Change

Order via Phone: Domestic (US) Dealers Call:
1-800-427-1244

Non-Dealer Customers:
Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.

International Customers should contact
their local Multiquip Representatives for
Parts Ordering information.

When ordering parts, please supply:
R
R
R
R
R
R

Dealer Account Number
Dealer Name and Address
Shipping Address (if different than billing address)
Return Fax Number
Applicable Model Number
Quantity, Part Number and Description of Each Part

Specify Preferred Method of Shipment:
UPS/Fed Ex
DHL
N Priority One
Truck
N Ground
N Next Day
N Second/Third Day

NOTICE
All orders are treated as Standard Orders and will
ship the same day if received prior to 3PM PST.

WE ACCEPT ALL MAJOR CREDIT CARDS!

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 5

DCA-20SPX — SPECIFICATIONS
Table 1. Generator Specifications
Model

DCA-20SPX

Type

Revolving field, self ventilated, open protected type synchronous
generator

Armature Connection

Series

Phase

Single Phase 3-Wire

Standby Output

22 KW (27.5 KVA)

Prime Output

20 KW (25 KVA)

Voltage

240V/120

Frequency

60 Hz

Speed

1800 r pm

Power Factor

1.0

Aux. AC Power

Single Phase, 60 Hz

Voltage

120 V

Output

4.8 KW (2.4 KW x 2)

Table 2. Engine Specifications
Model

IZUZU AA-4LE2

Type

4 Cycle, water-cooled, direct injection

No. of Cylinders

4 cylinders

Bore x Stroke

3.35 in. x 3.78 in. (85 mm x 96 mm)

Rated Output

35 HP/1800 rpm

Displacement

132 cu. in. (2,163 cc)

Starting

Electric

Coolant Capacity

1.7 gal. (6.6 liters)

Lube Oil Capacity

2.24 gal. (8.5 liters)

Fuel Tank Capacity

17.2 gal. (65 liters)
1.58 gal. (5.98 L)/hr at full load

1.19 gal. (4.50 L)/hr at 3/4 load

0.87 gal. (3.28 L)/hr at 1/2 load

0.58 gal. (2.20 L)/hr at 1/4 load

Fuel Consumption
Battery

27 (CCA 0° F 525A) x 1

Fuel

#2 Diesel Fuel

PAGE 6 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — DIMENSIONS (TOP, SIDE AND FRONT)

Figure 1. Dimensions

TABLE 3. DIMENSIONS
Reference
Letter

Dimension ft. (mm.)

Reference Letter

Dimension ft. (mm.)

21.06 in. (535 mm.)

72.83 in. (1,850 mm.)

21.06 in. (535 mm.)

39.37 in. (1,000 mm.)

24.21 in. (615 mm.)

29.53 in. (750 mm.)

26.38 in. (670 mm.)

25.00 in. (635 mm.)

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 7

DCA-20SPX — SAFETY MESSAGE ALERT SYMBOLS
FOR YOUR SAFETY AND THE SAFETY OF OTHERS!
Safety precautions should be followed at all times when
operating this equipment. Failure to read and understand the
Safety Messages and Operating Instructions could result in
injury to yourself and others.

NOTE

This Owner's Manual has been
developed to provide complete
instructions for the safe and
efficient operation of the
MQ Power Model DCA-20SPX
Whisperwatt™ Generator.

Before using this generator, ensure that the operating
individual has read and understands all instructions in
this manual.

HAZARD SYMBOLS
Potential hazards associated with the operation of this
equipment will be referenced with "Hazard Symbols" which
appear throughout this manual, and will be referenced in
conjunction with Safety "Message Alert Symbols".
WARNING - LETHAL EXHAUST GASES
Gasoline engine exhaust gases contain
poisonous carbon monoxide. This gas is
colorless and odorless, and can cause
DEATH if inhaled. NEVER operate this
equipment in a confined area or enclosed structure that
does not provide ample free flow air.
WARNING - EXPLOSIVE FUEL

SAFETY MESSAGE ALERT SYMBOLS
The three (3) Safety Messages shown below will inform you
about potential hazards that could injure you or others. The
Safety Messages specifically address the level of exposure
to the operator, and are preceded by one of three words:
DANGER, WARNING, or CAUTION.
DANGER
You WILL be KILLED or SERIOUSLY injured if you
do not follow directions.
WARNING

Gasoline is extremely flammable, and
its vapors can cause an explosion if
ignited. DO NOT start the engine near
spilled fuel or combustible fluids.
DO NOT fill the fuel tank while the engine
is running or hot.
DO NOT overfill tank, since spilled fuel could ignite if it
comes into contact with hot engine parts or sparks from
the ignition system. Store fuel in approved containers, in
well-ventilated areas and away from sparks and flames.
NEVER use fuel as a cleaning agent.
WARNING - BURN HAZARDS

You COULD be KILLED or SERIOUSLY injured if
you do not follow directions.

CAUTION

Engine components can generate extreme
heat. To prevent burns, DO NOT touch these
areas while the engine is running or
immediately after operations. NEVER
operate the engine with heat shields or heat
guards removed.

You CAN be injured if you do not follow directions
DANGER - ELECTROCUTION HAZARDS
During operation of this generator, there
exists the possibility of electrocution,
electrical shock or burn, which can cause
severe bodily harm or even DEATH!

PAGE 8 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — SAFETY MESSAGE ALERT SYMBOLS
WARNING - ROTATING PARTS
NEVER operate equipment with covers,
or guards removed. Keep fingers, hands,
hair and clothing away from all moving
parts to prevent injury.
CAUTION - ACCIDENTAL STARTING
ALWAYS place the engine ON/OFF
switch (MPEC) in the OFF/RESET
position when the generator is not in use.

CAUTION - OVER-SPEED CONDITIONS
NEVER tamper with the factory settings
of the engine governor or settings.
Personal injury and damage to the engine
or equipment can result if operating in
speed ranges above maximum allowable.

CAUTION - RESPIRATORY HAZARDS
ALWAYS wear approved respiratory
protection.

CAUTION - SIGHT AND HEARING HAZARDS
ALWAYS wear approved eye and
hearing protection.

CAUTION - EQUIPMENT DAMAGE MESSAGES
Other important messages are provided throughout this
manual to help prevent damage to your generator, other
property, or the surrounding environment.

CAUTION - ENGINE LOAD (WET-STACKING)

NOTE

This generator, other property, or
the surrounding environment
could be damaged if you do not
follow instructions.

Wet-Stacking is a common problem with diesel engines
which are operated for extended periods with light or no
load applied. When a diesel engine operates without
sufficient load (less than 40% of the rated output) it will
not operate at its optimum temperature. This will allow
unburned fuel to accumulate in the exhaust system, which
can foul the fuel injectors, engine valves and exhaust
system, including turbocharges, and reduce the operating
performance.
In order for a diesel engine to operate at peak efficiency it
must be able to provide fuel and air in the proper ratio and
at a high enough engine temperature for the engine to
completely burn all of the fuel.
Wet stacking does usually cause any permanent damage
and can be alleviated if additional load is applied to relieve
the condition. It can reduce the system performance and
increase maintenance. Applying an increasing load over a
period of time until the excess fuel is burned off and the
system capacity is reached usually can repair the condition.
This can take several hours to burn off the accumulated
unburned fuel.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 9

DCA-20SPX — RULES FOR SAFE OPERATION
DANGER - READ THIS MANUAL!
Failure to follow instructions in this manual may lead to
serious injury or even DEATH! This equipment is to be
operated by trained and qualified personnel only! This
equipment is for industrial use only.
The following safety guidelines should always be used when
operating the DCA-20SPX Whisperwatt™ AC Generator.

■ NEVER use accessories or attachments, which are not
recommended by Multiquip for this equipment. Damage
to the equipment and/or injury to user may result.
■ NEVER touch the hot exhaust
manifold, muffler or cylinder.
Allow these parts to cool before
servicing engine or generators.

General Safety:
■ DO NOT operate or service this
equipment before reading this entire
manual.

■ The engine section of this generators requires an adequate
free flow of cooling air. NEVER operate the generator in
any enclosed or narrow area where free flow of the air is
restricted. If the air flow is restricted it will cause serious
damage to the generators
■ This equipment should not be operated by persons under
or engine and may cause
18 years of age.
injury
to
people.
■ NEVER operate this equipment without proper protective
Remember the generator's
clothing, shatterproof glasses, steel-toed boots and other
engine gives off DEADLY
protective devices required by the job.
carbon monoxide gas.
The operator MUST BE familiar with proper safety
precautions and operations techniques before using
generator.

Denyo

DANGEROUS
GAS FUMES

■ NEVER operate this equipment when not
feeling well due to fatigue, illness or taking
medicine.
■ NEVER operate this equipment under the influence or
drugs or alcohol.

■ ALWAYS wear proper respiratory (mask),
hearing and eye protection equipment when
operating the generator.
■ Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.
■ Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
equipment modification will void all warranties.

■ ALWAYS refuel in a well-ventilated area, away from sparks
and open flames.
■ ALWAYS use extreme caution when
working with flammable liquids. When
refueling, stop the engine and allow it to
cool. DO NOT smoke around or near the
machine. Fire or explosion could result
from fuel vapors, or if fuel is spilled on a
hot engine.
■ NEVER operate the generator in an
explosive atmosphere or near
combustible materials. An explosion or
fire could result causing severe bodily
harm or even death.
■ NEVER disconnect any "emergency or safety devices".
These devices are intended for operator safety. Disconnection
of these devices can cause severe injury, bodily harm or even
death! Disconnection of any of these devices will void all
warranties.

PAGE 10 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — RULES FOR SAFE OPERATION
■ ALWAYS be sure the operator is familiar with proper safety
precautions and operation techniques before using
generators.
NEVER leave the generator unattended, turn off engine when
unattended.

Unauthorized equipment modifications will void all warranties.
ALWAYS ensure generator is on level ground before use.

DO NOT place hands or fingers inside generators engine
compartment when engine is running.
NEVER run engine without air cleaner. Severe engine damage
may occur.
NEVER change or adjust the engine speed which has been
set at the factory prior to shipping.

Power Cord Safety
NEVER let power cables or cords lay in water.
NEVER stand in water while AC power from the generators
is being transfer to a load.
NEVER use a defective or frayed power cable. Check the
cable for cuts in the insulation.
NEVER use a extension cord that is frayed or damaged where
the insulation has been cut.
ALWAYS make certain that proper power or extension cord
has been selected for the job See Table 4.

Grounding Safety
ALWAYS make sure that electrical circuits are properly
grounded per the National Electrical Code (NEC) and
local codes before operating generator. Severe injury or
death! by electrocution can result from operating an
ungrounded generator.
ALWAYS make sure the generators are properly grounded to
a suitable earth ground (GROUND ROD). See installation in
this manual.

Maintenance Safety
NEVER lubricate components or attempt service on a running
machine.
High Temperatures – Always stop engine and
allow the engine to cool before adding fuel, oil
or performing service and maintenance
functions. Contact with hot! components can
cause serious burns.
Keep the machinery in proper running condition.
Fix damage to the machine immediately and replace any
broken parts immediately.
ALWAYS replace any worn or damaged warning decals.
ALWAYS store equipment properly when it is not being used.
Equipment should be stored in a clean, dry location out of the
reach of children and un-authorized personnel.

The electrical voltage required to operate the generator can
cause severe injury or even death through physical contact
with live circuits. Turn all circuit breakers OFF before
performing maintenance on the generator.
Dispose of hazardous waste properly. Examples of potentially
hazardous waste are used motor oil, fuel and fuel filters.
DO NOT use food or plastic containers to dispose of
hazardous waste.
DO NOT pour waste, oil or fuel directly onto the ground,
down a drain or into any water source.

■ ALWAYS allow the machine a proper amount of time to
cool before servicing.
■ ALWAYS service air cleaner frequently to prevent engine
malfunction.
■ ALWAYS disconnect the NEGATIVE battery terminal
before performing service on the generator.
■ Follow all battery safety guidelines listed in this manual
when handleing or servicing the generator.

NEVER use gas piping as an electrical ground.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 11

DCA-20SPX — RULES FOR SAFE OPERATION
WARNING - BURN HAZARDS
To prevent burns, DO NOT touch or open any of the below
mentioned components while the engine is
running or immediately after operations.
Always allow sufficient time for the engine
and generator to cool before performing
maintenance.
■ Radiator Cap - Removing the radiator cap while the
engine is hot will result in high pressurized, boiling water
to gush out of the radiator, causing severe scalding to
any persons in the general area of the generator.
■ Coolant Drain Plug - Removing the
coolant drain plug while the engine is
hot will result in hot coolant gushing
out of the coolant drain plug, therefore
causing severe scalding to any persons
in the general area of the generator.
■ Engine Oil Drain Plug - Removing the engine oil drain
plug while the engine is hot will result in hot oil gushing
out of the oil drain plug, therefore causing severe
scalding to any persons in the general area of the
generator.

Battery Safety
Use the following guidelines when handling the battery:
■ The battery contains acids that can
cause injury to the eyes and skin. To
avoid eye irritation, always wear safety
glasses.
■ Use well insulated gloves when picking up the battery.
DANGER - EXPLOSION HAZARDS
The risk of an explosion exists when performing service
on the battery. To avoid severe injury or DEATH:
DO NOT drop the battery. There
is the possibility of risk that the
battery may explode.
DO NOT expose the battery to
open flames, sparks, cigarettes
etc. The battery contains combustible gases and liquids.
If these gases and liquids come in contact with a flame
or spark, an explosion could occur.
■ ALWAYS keep the battery charged. If the battery is not
charged a buildup of combustible gas will occur.
ALWAYS keep battery charging and cables in good
working condition. Repair or replace all worn cables.
ALWAYS recharge the battery in an vented air
environment, to avoid risk of a dangerous concentration
of combustible gases.
In case the battery liquid (dilute sulfuric acid) comes in
contact with clothing or skin, rinse skin or clothing
immediately with plenty of water.
In case the battery liquid (dilute sulfuric acid) comes in
contact with your EYES, rinse eyes immediately with
plenty of water and contact the nearest doctor or hospital
to seek medical attention.

PAGE 12 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — RULES FOR SAFE OPERATION

Generator exhaust contains carbon monoxide. This is
a posion you cannot see or smell

20A

2900

120
V

OFF

GA-2.9R
120V

20A

2900
120V

OFF

AC CIRCUIT
BREAKER

20A

2900

120
V

GA-2.9R

22A

NEVER grab or touch a live
power cord with wet hands, the
possibility exist of electrical
shock, electrocution, and even
death!

DANGER
Using a generator indoors CAN KILL YOU IN MINUTES.

120
V

GA-2.9R

OFF

NEVER use damaged or worn cables when connecting
equipment to the generator. Make sure power connecting
cables are securely connected to the generator’s output
receptacles, incorrect connections may cause damage
to the generators and electrical shock.

AC CIRCUIT
BREAKER

120V

22A

To avoid these hazards:

Engine exhaust gases contain
poisonous carbon monoxide. This gas
is colorless and odorless, and can
cause death if inhaled. NEVER operate
this equipment in a confined area or
enclosed structure that does not provide
ample free flow air.

OFF

During operation of this generation, there
exists the possibility of electrocution,
electrical shock or burn, which can
cause severe bodily harm or even
DEATH!

DANGER-Lethal Exhaust Gas Hazards

22A

DANGER -Electrocution Hazards

OFF

AC CIRCUIT
BREAKER

OFF

NEVER use inside a home
or garage, even if doors
and windows are open

Only use OUTSIDE and
far away from windows,
doors, and vents.

Avoid other generator hazards.
READ MANUAL BEFORE USE.

Emergencies

NEVER insert any objects into
the output receptacles during
operation. This is extremely
dangerous. ALWAYS turn-off
the generators and place all circuit breakers in the “OFF”
position when contact with the output receptacles is
required. There exist the possibility of electrocution,
electrical shock or burn, which can cause severe
bodily harm or even death!
Backfeed to a utility system can cause
electrocution and or property damage.
NEVER connect the generators to a
building's electrical system without a
transfer switch or other approved device.
All installations should be performed by
a licensed electrician in accordance
with all applicable laws and electrical
codes. Failure to do so could result in
electrical shock or burn causing serious
injury or even death!

ALWAYS know the location of the
nearest fire extinguisher.

ALWAYS know the location of the nearest
first aid kit.

In emergencies always know the location of the
nearest phone or keep a phone on the job site.
Also know the phone numbers of the nearest
ambulance, doctor and fire department. This
information will be invaluable in the case of an
emergency.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 13

DCA-20SPX — RULES FOR SAFE OPERATION
If your generator is trailer mounted, please
read the towing and safety requirements
listed below.
Towing and Transporting Safety
To reduce the possibility of an accident while transporting
the generator on public roads, always make sure the trailer
that supports the generator and the towing vehicle are in
good operating condition and both units are mechanically
sound.
The following list of safety precautions should be followed
when towing your generator:
CAUTION - FOLLOW TOWING REGULATIONS
Check with your local county or state safety towing
regulations, in addition to meeting Department of
Transportation (DOT) Safety Towing Regulations, before
towing your generator.
■ ALWAYS shutdown engine before transporting.
■ Drain fuel from generator fuel tank before towing.
■ If generator is mounted on a trailer, make sure trailer
complies with all local and state safety transportation
laws. Follow the listed Towing & Transporting Safety
guidelines for basic towing techniques.
■ Make sure the hitch and coupling of the towing vehicle
are rated equal to, or greater than the trailer "gross vehicle
weight rating.”
■ ALWAYS inspect the hitch and coupling for wear. NEVER
tow a trailer with defective hitches, couplings, chains etc.
■ Check the tire air pressure on both towing vehicle and
trailer. Trailer tires should be inflated to 50 psi cold.
Also check the tire tread wear on both vehicles.

■ DOT Requirements include the following:
 Connect and test electric brake operation.
 Secure portable power cables in cable tray with tie
wraps.
■ The maximum speed for highway towing is 55 MPH
unless posted otherwise. Recommended off-road towing
is not to exceed 15 MPH or less depending on type of
terrain.
■ Place chock blocks underneath wheel to prevent rolling,
while parked.
■ Use the trailer’s swivel jack to adjust the trailer height to
a level position while parked.
■ Avoid sudden stops and starts. This can cause skidding,
or jack-knifing. Smooth, gradual starts and stops will
improve towing.
■ Avoid sharp turns.
■ Trailer should be adjusted to a level position at all times
when towing.
■ Raise and lock trailer wheel stand in up position when
transporting.
■ The maximum speed for highway towing is 55 MPH
unless posted otherwise. Recommended off-road towing
is not to exceed 15 MPH or less depending on type of
terrain.
■ Place support blocks underneath the trailer’s bumper to
prevent tipping, while parked.
■ Avoid sharp turns to prevent rolling.
■ DO NOT transport generator with fuel in tank.

NOTE

For more saftey tips, see the trailer saftey
guidelines section in this manual.

■ ALWAYS make sure the trailer is equipped with a "Safety
Chain".
■ ALWAYS attach trailer’s safety chains to towing vehicle
properly.
■ ALWAYS make sure the vehicle and trailer directional,
backup, brake, and trailer lights are connected and
working properly.

PAGE 14 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

NOTE PAGE

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 15

DCA-20SPX — GENERATOR DECALS
The DCA-20SPX generator is equipped with a number of safety decals (Figures 2 and 3). These decals are provided for
operator safety and maintenance information. The illustration below and on the preceding page show the decals as they
appear on the machine. Should any of these decals become unreadable, replacements can be obtained from your dealer.

Figure 2. Generator Decals

PAGE 16 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — GENERATOR DECALS

Figure 3. Generator Decals (Cont inued)

DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 17

DCA-20SPX — INSTALLATION

Figure 4. Typical Generator Grounding Application

PAGE 18 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — INSTALLATION
Outdoor Installation

Generator Grounding

Install the generator in a area that is free of debris,
bystanders, and overhead obstructions. Make sure the
generator is on secure level ground so that it cannot slide or
shift around. Also install the generator in a manner so that
the exhaust will not be discharged in the direction of nearby
homes.
The installation site must be relatively free from moisture
and dust. All electrical equipment should be protected from
excessive moisture. Failure to do will result in deterioration
of the insulation and will result in short circuits and grounding.

To guard against electrical shock and possible damage to
the equipment, it is important to provide a good EARTH
ground.
Article 250 (Grounding) of the National Electrical Code (NEC)
provides guide lines for proper grounding and specifies that
the cable ground shall be connected to the grounding system
of the building as close to the point of cable entry as
practical.

Foreign materials such as dust, sand, lint and abrasive
materials have a tendency to cause excessive wear to
engine and alternator parts.

1. Use one of the following wire types to connect the
generator to earth ground.

CAUTION - EXHAUST HAZARD
Pay close attention to ventilation when operating the
generator inside tunnels and caves. The engine exhaust
contains noxious elements. Engine exhaust must be routed
to a ventilated area.
Indoor Installation
Exhaust gases from diesel engines are extremely poisonous.
Whenever an engine is installed indoors the exhaust fumes
must be vented to the outside. The engine should be installed
at least two feet from any outside wall. Using an exhaust
pipe which is too long or too small can cause excessive
back pressure which will cause the engine to heat excessively
and possibly burn the valves.

NEC articles 250-64(b) and 250-66 set the following
grounding requirements:

a. Copper - 10 AWG (5.3 mm2) or larger.
b. Aluminum - 8 AWG (8.4 mm2) or larger.
2. When grounding the generator (Figure 4) connect the
ground cable between the lock washer and the nut on
the generator and tighten the nut fully. Connect the other
end of the ground cable to earth ground.
3. NEC article 250-52(c) specifies that the earth ground
rod should be buried aminimum of 8 ft. into the ground.

NOTE

When connecting the generator
to any buildings electrical
system ALWAYS consult with
a licensed electrician.

Mounting
The generator must be mounted on a solid foundation (such
as concrete) and set firmly on the foundation to isolate
vibration of the generator when it is running. The generator
must set at least 6 inches above the floor or grade level (in
accordance to NFPA 110, Chapter 5-4.1). DO NOT remove
the metal skids on the bottom of the generator. They are to
resist damage to the bottom of the generator and to maintain
alignment.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 19

DCA-20SPX — GENERAL INFORMATION
DCA-20SPX Whisperwatt™ Series Familiarization
Generator
The MQ Power Model DCA-20SPX is a 20 kW generator
(Figure 5) that is designed as a high quality portable (requires
a trailer for transport) power source for telecom sites, lighting
facilities, power tools, submersible pumps and other industrial
and construction machinery.
Engine Operating Panel
The “Engine Operating Panel” is provided with the following:
■ Tachometer
■ Water Temperature Gauge
■ Oil Pressure Gauge
■ Charging Ammeter Gauge
■ Fuel Level Gauge
■ Panel Light/Panel Light Switch
■ Auto ON/OFF Engine Controller (MPEC)
Generator Control Panel
The “Generator Control Panel” is provided with the following:
■ Frequency Meter (Hz)
■ AC Ammeter (Amps)
■ AC Voltmeter (Volts)
■ Ammeter Change-Over Switch
■ Voltage Regulator
■ 3-Pole, 90 amp Main Circuit Breaker
■ “Control Box” (located behind the Gen. Control Panel)
■ Automatic Voltage Regulator
■ Current Transformer
■ Over-Current Relay
■ Voltage Rectifer
■ Starter Relay
■ Engine Controller (Computer Controlled)
■ Voltage Selector Switch
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
■ Two 120/240V output receptacles (CS-6369), 50A
■ Two auxilliary circuit breakers, (for CS-6369), 50A
■ Two 120V output receptacles (GFCI), 20A
■ Two GFCI circuit breakers, 20A
■ Four output terminal lugs (1Ø power)
■ Battery Charger (Optional)
■ Water Heater (Optional)

Open Delta Excitation System
The DCA-20SPX generator is equipped with the state of the
art "Open-Delta" excitation system. The open delta system
consist of an electrically independent winding wound among
stationary windings of the AC output section.
There are four connections of the open delta A, B, C and D.
During steady state loads, the power from the voltage regulator
is supplied from the parallel connections of A to B, A to D,
and C to D. These three phases of the voltage input to the
voltage regulator are then rectified and are the excitation
current for the exciter section.
When a heavy load, such as a motor starting or a short
circuit occurs, the automatic voltage regulator (AVR)
switches the configuration of the open delta to the series
connection of B to C. This has the effect of adding the voltages
of each phase to provide higher excitation to the exciter
section and thus better voltage response during the
application of heavy loads.
The connections of the AVR to the AC output windings are
for sensing only. No power is required from these windings.
The open-delta design provides virtually unlimited excitation
current, offering maximum motor starting capabilities. The
excitation does not have a "fixed ceiling" and responds
according the demands of the required load.
Engine
The DCA-20SPX is powered by a 4 cylinder, water cooled,
direct injection, Isuzu Model AA-4LE2 diesel engine. This
engine is designed to meet every performance requirement
for the generator. Reference Table 1 for engine specifications.
In keeping with MQ Power's policy of constantly improving
its products, the specifications quoted herein are subject to
change without prior notice.
Electric Governor System
The electric governor system controls the RPMs of the engine. When the engine demand increases or decreases, the
governor system regulates the frequency variation to ±.25%.
Extension Cables
When electric power is to be provided to various tools or
loads at some distance from the generator, extension cords
are normally used. Cables should be sized to allow for
distance in length and amperage so that the voltage drop
between the generator and point of use (load) is held to a
minimum. Use the cable selection chart (Table 6) as a guide
for selecting proper extension cable size.

PAGE 20 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — MAJOR COMPONENTS

Table 4. Generator Major Components
ITEM NO.

Figure 5. Major Components

DESCRIPTION

Output Terminal Assembly

Output Receptacles Assembly

Muffler Assembly

Air Filter Assembly

Battery Assembly

Generator Assembly

Engine Assembly

Fuel Tank Assembly

Circuit Breaker Assembly

Engine Control Panel Assembly

Generator Control Panel Assembly

DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 21

NOTE PAGE

PAGE 22 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — GENERATOR CONTROL PANEL
4
DECREASE

INCREASE

5
U

W
OFF

Figure 6. Generator Control Panel
The definitions below describe the controls and functions of Located behind the generator control panel is the Generator
Control Box. This box contains some of the necessary
the DCA-20SPX Generator Control Panel (Figure 6).
1. Frequency Meter – Indicates the output frequency in electronic components required to make the generator
function.
hertz (Hz). Normally 60 Hz.
2.

3.
4.
5.

AC Ammeter – Indicates the amount of current the load The Control Box is equipped with the following major
is drawing from the generator per leg selected by the components:
■ Over-Current Relay
ammeter phase-selector switch.
■ Voltage Rectifer (AVR)
AC Voltmeter – Indicates the output voltage present at ■ Starter Relay
the U,O, and V Output Terminal Lugs.
■ Current Transformer
Voltage Regulator Control – Allows ±15% manual ■ Voltage Selector Switch
adjustment of the generator’s output voltage.
■ Single Phase Circuit Breaker
Ammeter Change-Over Switch – This switch allows
Remember the overcurrent
the AC ammeter to indicate the current flowing to the
relay monitors the current
NOTE
load connected to any phase of the output terminals, or
flowing from the U,O and V
to be switched off. This switch does not effect the
Output Terminal Lugs to the
generator output in any fashion, it is for current reading
load.
only.
In the event of a short circuit or over current condition, it will
Main Circuit Breaker – This three-pole, 90A main automatically trip the 90 amp main breaker.
breaker is provided to protect the the U,O, and V Output
To restore power to the Output Terminal Panel, press the
Terminal Lugs from overload.
reset button on the overcurrent relay and place the main
circuit breaker in the closed position (ON).

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 23

DCA-20SPX — ENGINE OPERATING PANEL

5
AUTO

MANUAL

OFF/RESET
LOW OIL PRESSURE
HIGH COOLANT TEMPERATURE
OVERCRANK
OVERSPEED
ENGINE RUNNING

MOOOOO-20001Q

1000

2000

3000

RPM

Figure 7. Engine Operating Panel

PAGE 24 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — ENGINE OPERATING PANEL
The definitions below describe the controls and functions of
the DCA-20SPX Engine Operating Panel (Figure 7).
1. Panel Light – Normally used in dark areas or at night
time. When activated, panel lights will illuminate. When
the generator is not in use be sure to turn the panel
light switch to the OFF position.
2. Panel Light Switch – When activated will turn on control
panel light.
3. Oil Pressure Gauge – During normal operation this
gauge be should read between 35 to 65 psi. (241~448
kPa). When starting the generator the oil pressure may
read a little higher, but after the engine warms up the oil
pressure should return to the correct pressure range.
4. Water Temperature Gauge – During normal operation
this gauge should read between 180° and 221°F (82°
~105°C)
5. Charging Ammeter Gauge – Indicates the current
being supplied by the engine’s alternator which provides
current for generator’s control circuits and battery
charging system.
6. Fuel Gauge - Indicates amount of diesel fuel available.
7. Tachometer – Indicates engine speed in RPM’s for 60
Hz operation. This meter should indicate 1800 RPM’s
when the rated load is applied. In addition a built in hour
meter will record the number of operational hours that
the generator has been in use.
8. Fuel Filter Water Level Alarm Lamp– This lamp will
illuminate when an excessive amount of water has
accumulated in fuel filter. Drain water in the strainer
immediately if this lamp is on.
9.

If the engine does not engage (start) by the third attempt,
the engine will be shutdown by the engine controller’s Over
Crank Protection mode. If the engine engages at a speed
(RPM's) that is not safe, the controller will shutdown the
engine by initializing the Over Speed Protection mode.
Also the engine controller will shut down the engine in the
event of low oil pressure, high coolant temperature, low
coolant level, and loss of magnetic pickup. These conditions
can be observed by monitoring the LED status indicators on
the front of the controller module.
A. MPEC Control Switch – This switch controls the
running of the unit. If this switch is set to the
OFF/RESET position, the unit will not run. When this
switch is set to the MANUAL position, the generator
will start immediately.
If the generator is to be connected to a building’s AC
power source via an automatic transfer switch
(isolation), place the switch in the AUTO position. In
this position, should an outage occur, the automatic
transfer switch (ATS) will start the generator
automatically via the generator’s auto-start contacts
connected to the ATS’s start contacts. Please refer to
your ATS installation manual for further instructions for
the correct installation of the auto-start contacts of the
generator to the ATS.
B. Low Oil Pressure – Indicates the engine pressure has
fallen below 14 psi (97 kPa). The oil pressure is detected
using variable resistive values from the oil pressure
sending unit. This is considered a major fault.

C. High Coolant Temperature – Indicates the engine
Auto On/Off Engine Controller (MPEC) –
temperature has exceeded 221°F. (105°C). The engine
This controller has a vertical row of status LED's (inset),
temperature is detected using variable resistive values
that when lit, indicate that an engine malfunction (fault)
from the temperature sending unit. This is considered
has been detected. When a fault
a major fault.
has been detected the engine
D. Overcrank Shutdown – Indicates the unit has
controller will evaluate the fault
attempted to start a pre- programmed number of times,
and all major faults will shutdown
and has failed to start. The number of cycles and
the generator. During cranking
duration are programmable. It is pre-set at 3 cycles
cycle , The MPEC will attempt to
with a 10 second duration. This is considered a major
crank the engine for 10 seconds
fault.
before disengaging.
E. Overspeed Shutdown – Indicates the engine is running
at an unsafe speed. This is considered a major fault.
F. Engine Running – Indicates that engine is running at
a safe operating speed.
1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 25

DCA-20SPX — OUTPUT TERMINAL PANEL FAMILIARIZATION
Output Terminal Panel
The Output Terminal Panel (Figure 8) shown below is located
on the right-hand side (left from control panel) of the generator.
Lift up on the cover to gain access to receptacles and terminal
lugs.

Output Terminal Familiarization
The “Output Terminal Panel ” (Figure 8) is provided with the
following:
■ Two 120/240V output receptacles (CS-6369), 50A
■ Two auxilliary circuit breakers, (for CS-6369), 50A
■ Two 120V GFCI receptacles @ 20 amp
■ Two GFCI circuit breakers @ 20 amps
■ Four Output Terminal Lugs ( U, O, V and Ground)

Figure 8. Output Terminal Panel
PAGE 26 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — OUTPUT TERMINAL PANEL FAMILIARIZATION
120 VAC GFCI Receptacles
There are two 120 VAC, 20 amp GFCI (Duplex Nema 5-20R)
recepacles provided on the output terminal panel. These
receptacles can be accessed in any voltage selector switch
position. Each receptacle is protected by a 20 amp circuit
breaker. These breakers are located directly above the GFCI
receptacles. Remember the load output (current) of both
GFCI receptacles is dependent on the load requirements of
the U, O, and V output terminal lugs.
Pressing the reset button resets the GFCI receptacle after
being tripped. Pressing the Test Button (See Figure 9) in
the center of the receptacle will check the GFCI function.
Both receptacles should be tested at least once a month.

Each auxilliary receptacle is protected by a 50 amp circuit
breaker. These breakers are located directly above the GFCI
receptacles. Remember the load output (current) on all three
receptacles is dependent on the load requirements of the
Output Terminal Lugs.
Turn the voltage regulator control knob (Figure 11) on the
control panel to obtain the desired voltage. Turning the knob
clockwise will increase the voltage, turning the knob counterclockwise will decrease the voltage.

Figure 11. Voltage Regulator Control Knob
Removing the Plastic Face Plate (Hard Wire Hookup Panel)
The Output Terminal Lugs are protected by a plastic face
plate cover (Figure 12). Un-screw the securing bolts and lift
the plastic terminal cover to gain access to the terminal
enclosure.
After the load wires have been securely attached to the
terminal lugs, reinstall the plastic face plate.
Figure 9. G.F.C.I. Receptacle
Twist Lock Dual Voltage 120/240 VAC Receptacles
There are three 120/240V, 50 amp auxilliary twist-lock
(CS-6369) recepacles (Figure 10) provided on the output
terminal panel.These receptacles can only be accessed
when the voltage selector switch is placed in the singlephase 240/120 position.

Figure 12. Plastic Face Plate (Output Terminal Lugs)

Figure 10. 120/240V Twist-Lock
Auxiliary Receptacles
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 27

DCA-20SPX — OUTPUT TERMINAL PANEL FAMILIARIZATION
Over Current Relay
Loads can be connected to the generator by the Ouput An over current relay (Figure 14) is connected to the main
Terminal Lugs or the convenience receptacles (Figure 13). circuit breaker. In the event of an overload, both the circuit
Make sure to read the operation manual before attempting breaker and the over current relay may trip. If the circuit
breaker can not be reset, the reset button on the over curto connect a load to the generator.
rent relay must be pressed. The over current relay is loTo protect the output terminals from overload, a
cated in the control box.
3-pole, 90A main circuit breaker is provided. Make sure to
switch ALL circuit breakers to the OFF position prior to
starting the engine.
Connecting Loads

Figure 14. Over Current Relay

Figure 13. Connecting Loads

PAGE 28 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — LOAD APPLICATION/MAXIMUM AMPERAGE
Single Phase Load
Always be sure to check the nameplate on the generator
and equipment to insure the wattage, amperage, frequency,
and voltage requirements are satisfactorily supplied by the
generator for operating the equipment.
Generally, the wattage listed on the nameplate of the
equipment is its rated output. Equipment may require 130—
150% more wattage than the rating on the nameplate, as
the wattage is influenced by the efficiency, power factor and
starting system of the equipment.
If wattage is not given on the
equipment's name plate,
approximate wattage may be
determined by multiplying
nameplate voltage by the
nameplate amperage.

NOTE

Motors and motor-driven
equipment draw much greater
current for starting than during
operation.

An inadequate size connecting cable which cannot carry the
required load can cause a voltage drop which can burn out
the appliance or tool and overheat the cable. See Table 6.
■ When connecting a resistance load such as an

incandescent lamp or electric heater, a capacity of up to
the generating set’s rated output (kW) can be used.
■ When connecting a fluorescent or mercury lamp, a

capacity of up to the generating set’s rated output (kW)
multiplied by 0.6 can be used.
■ When connecting an electric drill or other power tools,

WATTS = VOLTAGE x AMPERAGE
The power factor of this generator is 0.8. See Table 5 below
when connecting loads.

Table 5. Power Factor By Load
Type Of Load

NOTE

pay close attention to the required starting current
capacity.
When connecting ordinary power tools, a capacity of up to
the generating set’s rated output (kW) multiplied by 0.8 can
be used.

Power Factor

Single-phase induction motors

0.4 - 0.75

Electric heaters, incandescent
lamps

1 .0

Fluorescent lamps, mercury lamps

0.4 - 0.9

Electronic devices, communication
equipment

1.0

Common power tools

0.8

DANGER - ELECTRICAL SYSTEM HAZARDS
Before connecting this generator to any building’s electrical
system, a licensed electrician must install an isolation
(transfer) switch. Serious damage to the building’s
electrical system may occur without this transfer switch.
Generator Amperage
Table 7 describes the generator’s current output capability.

Table 6. Cable Selection (60 Hz, Single Phase Operation)
Load In Watts
Current in
Amperes At 100 At 200
Volts
Volts

Table 7. Generator Maximum Amps

Maximum Allowable Cable Length
#10 Wire

#12 Wire

#14 Wire

#16 Wire

2.5

30 0

600

1000 ft.

600 ft.

375 ft.

2 5 0 ft .

600

1200

500 ft.

300 ft.

200 ft.

1 2 5 ft .
100 ft.

7.5

900

1800

350 ft.

200 ft.

125 ft.

1200

2400

250 ft.

150 ft.

100 ft.

1800

3600

150 ft.

100 ft.

65 ft.

2400

4800

125 ft.

75 ft.

50 ft.

CAUTION: Equipment damage can result from low voltage.

Rated Voltage

Maximum Amps

Single Phase
120 Volt

83 X 2 amps

Single Phase
240 Volt

83 amps

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 29

DCA-20SPX — GAUGE READING/ TERMINAL PANEL CONNECTIONS
How to Read the Output Terminal Gauges.
The gauges on the control panel are provided to help
observe how much power is being supplied at the Output
terminals lugs.
Reading Amperage
To determine the amperage at a terminal lug, set the
AC Ammeter Change-Over Switch to the appropriate
setting (Figure 15) to activate the AC Ammeter Gauge
(Figure 16) and read the available amperage at the terminal
lug.
For example, to measure the amperage at the U
terminal lug, set the AC Ammeter Change-Over Switch to
U and read the AC Ammeter Gauge.

Figure 17. Output Terminal Lugs
240 Single Phase Connections
2. Turn the voltage regulator knob (Figure 18) clockwise to
increase voltage output, turn counterclockwise to
decrease voltage output.

Figure 15. AC Ammeter
Change-Over Switch

Figure 16. AC Ammeter
(Amp reading on U lug)

Figure 18. Voltage Regulator Knob (139V/240V)
1Ø 120 Output Terminal Lug Voltages
1. Connect the load wires to the Output Terminal Lugs as
shown in (Figure 19)

NOTE

The ammeter gauge will only
show a reading when the Output
Terminal Lugs are connected
to a load and in use.

UOV Terminal Output Voltages
240/120V output voltages can be obtained using the Output
Terminal Lugs..
The voltage regulator (VR) allows the user to increase or
decrease the selected voltage.
1Ø 240 Output Terminal Lug Voltages
1. Connect the load wires to the Output Terminal Lugs as
shown in (Figure 17)

Figure 19. Output Terminal Lugs
120 Single Phase Connections
2. Turn the voltage regulator knob (Figure 18) clockwise to
increase voltage output, turn counterclockwise to
decrease voltage output.

PAGE 30 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — SETUP
Fuel Check

Circuit Breakers
To protect the generator from an overload, a 3-pole, 90 amp,
main circuit breaker is provided to protect the U,O, and V
Output Terminals from overload. In addition two single-pole,
20 amp GFCI circuit breakers are provided to protect the
GFCI receptacles from overload. Two 50 amp load circuit
breakers have also been provided to protect the auxiliary
receptacles from overload. Make sure to switch ALL circuit
breakers to the OFF position prior to starting the engine.
Lubrication Oil

DANGER - EXPLOSION/FIRE HAZARDS
Fuel spillage on a hot engine can cause a fire or explosion.
If fuel spillage occurs, wipe up the spilled fuel completely
to prevent fire hazards. NEVER smoke around or near the
generator.

Fill the engine crankcase with lubricating oil through the filler
hole, but DO NOT overfill. Make sure the generator is level.
and verify that the oil level is maintained between the two
notches (Figure 20) on the dipstick. See Table 8 for proper
Refilling the Fuel System
selection of engine oil.
CAUTION - REFUELING THE GENERATOR
ONLY properly trained personel who have read and
understand this section should refill the fuel tank system.
Figure 20. Engine Oil Dipstick
When checking the engine oil, be sure to check if the oil is
clean. If the oil is not clean, drain the oil by removing the oil
drain plug, and refill with the specified amount of oil as outlined
in the Isuzu Engine Owner's Manual. Oil should be warm
before draining.
Other types of motor oils may be substituted if they meet
the following requirements:
API Service Classification CC/SC
API Service Classification CC/SD
API Service Classification CC/SE
API Service Classification CC/SF
Table 8. Recommended Motor Oil

-40

20W40

-20
-30

10W

-4
-22

10W30

0
-10

15W30

32
-14

10W/40

50
40
30
20
10

5W30

122
104
86

OIL: SAE

ARCTIC OIL

10W40

■
■
■
■

This generator has an internal fuel tank located inside the
trailer frame and may also be equipped with an optional
environmental fuel tank (Figure 21). ALWAYS fill the fuel
tanks with clean fresh #2 diesel fuel. DO NOT fill the fuel
tanks beyond their capacities.
Pay attention to the fuel tank capacity when replenishing
fuel.The fuel tank cap must be closed tightly after filling.
Handle fuel in a safety container. If the container does not
have a spout, use a funnel. Wipe up any spilled fuel
immediately.

Figure 21. Internal Fuel Tank System

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 31

DCA-20SPX — SETUP
Refueling Procedure:
NOTE

WARNING - RESPIRATORY HAZARDS
Diesel fuel and its vapors are dangerous
to your health and the surrounding
environment. Avoid skin contact and/or
inhaling fumes.
1. Level Tanks – Make sure fuel cells are level with the
ground. Failure to do so will cause fuel to spill from the
tank before reaching full capacity (Figure 22).

If generator is equipped with an
environmental fuel tank, reference
Figures 24 and 25.

NEVER overfill fuel tank – It is important to read the
fuel gauge when filling trailer fuel tank. DO NOT wait for
fuel to rise in filler neck (Figure 24).

CAUTION - REFUELING THE GENERATOR

ALWAYS place trailer on firm level ground before refueling
to prevent spilling and maximize the amount of fuel that
can be pumped into the tank.

Figure 24. Full Fuel Tank

CAUTION - REFUELING THE GENERATOR
DO NOT OVER-FILL fuel system. Leave room for fuel
expansion. Fuel expands when heated (Figure 25).

Figure 22. Only Fill on Level Ground
NOTE

ONLY! use #2 diesel fuel when
refueling.
Figure 25. Fuel Expansion

Remove fuel cap (internal fuel tank) and fill fuel tank as
shown Figure 23.

Figure 23. Fueling the Generator
PAGE 32 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — SETUP
Coolant (Antifreeze/Summer Coolant/Water)
ISUZU recommends antifreeze/summer coolant for use in
their engines, which can be purchased in concentrate (and
mixed with 50% demineralized water) or pre-diluted. See
the ISUZU Engine Owner's Manual for further details.

Cleaning the Radiator
The engine may overheat if the radiator fins become
overloaded with dust or debris. Periodically clean the radiator
fins with compressed air. Cleaning inside the machine is
dangerous, so clean only with the engine turned off and the
negative battery terminal disconnected.
Air Cleaner

WARNING - BURN HAZARDS

Periodic cleaning/replacement is necessary. Inspect it in
accordance with the ISUZU Engine Owner's Manual.

If adding coolant/antifreeze mix to the
radiator, DO NOT remove the radiator cap
until the unit has completely cooled. The
possibility of hot! coolant exists which
can cause severe burns.

Fan Belt Tension

A slack fan belt may contribute to overheating, or to
insufficient charging of the battery. Inspect the fan belt for
damage and wear and adjust it in accordance with the ISUZU
Day-to-day addition of coolant is done from the recovery Engine Owner's Manual.
tank. When adding coolant to the radiator, DO NOT remove The fan belt tension is proper if the fan belt bends 10 to 15
the radiator cap until the unit has completely cooled. See mm (Figure 26) when depressed with the thumb as shown
Table 9 for engine, radiator, and recovery tank coolant below.
capacities. Make sure the coolant level in the recovery tank
is always between the "H" and the "L" markings.
Table 9. Coolant Capacity
Engine and Radiator

1.7 Gal. (6.6 liters)

Reserve Tank

2 Quar ts (1.9 liters)

Operation Freezing Weather

CAUTION - ROTATING PARTS

When operating in freezing weather, be certain the proper
amount of antifreeze (Table 10) has been added.
Table 10. Anti-Freeze
Operating Temperatures
Vol %
Anti-Freeze
50

NOTE

Figure 26. Fan Belt Tension

NEVER place hands near
the belts or fan while the
generator set is running.

Freezing Point
°C

°F

-37

-34

When the antifreeze is mixed with
water, the antifreeze mixing ratio
must be less than 50%.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 33

DCA-20SPX — SETUP
Battery

When connecting battery do the following:

This unit is of negative ground DO NOT connect in reverse. 1. NEVER connect the battery cables to the battery
terminals when the MPEC Control Switch is in either
Always maintain battery fluid level between the specified
marks. Battery life will be shortened, if the fluid level are not
the MANUAL position. ALWAYS make sure that the MPEC
Control Switch is in the OFF/RESET position when
properly maintained. Add only distilled water when
connecting the battery.
replenishment is necessary.
DO NOT over fill. Check to see whether the battery cables 2. Place a small amount of battery terminal treatment
compound around both battery terminals. This will ensure
are loose. Poor contact may result in poor starting or
a good connection and will help prevent corrosion around
malfunctions. Always keep the terminals firmly tightened.
Coating the terminals with an approved battery terminal
the battery terminals.
treatment compound. Replace battery with only
recommended type battery.
If the battery cable is connected
The battery is sufficiently charged if the specific gravity of
incorrectly, electrical damage to the
NOTE
the battery fluid is 1.28 (at 68° F). If the specific gravity
generator will occur. Pay close
should fall to 1.245 or lower, it indicates that the battery is
attention to the polarity of the
dead and needs to be recharged or replaced.
battery when connecting the
battery.
Before charging the battery with an external electric source,
be sure to disconnect the battery cables.
Battery Cable Installation
ALWAYS be sure the battery cables (Figure 27) are properly
connected to the battery terminals as shown below. The Red
Cable is connected to the positive terminal of the battery,
and the Black Cable is connected to the negative terminal
of the battery.

CAUTION - BATTERY SERVICING SAFETY

ALWAYS disconnect the negative terminal FIRST and
reconnect negative terminal LAST.

CAUTION - BATTERY SERVICING SAFETY
Inadequate battery connections may cause poor starting
of the generator, and create other malfunctions.
Alternator
The polarity of the alternator is negative grounding type. When
an inverted circuit connection takes place, the circuit will be
in short circuit instantaneously resulting the alternator failure.
DO NOT put water directly on the alternator. Entry of water
into the alternator can cause corrision and damage the
alternator.
Wiring
Inspect the entire generator for bad or worn electrical wiring
or connections. If any wiring or connections are exposed
(insulation missing) replace wiring immediately.
Piping and Hose Connection
Inspect all piping, oil hose, and fuel hose connections for
wear and tightness. Tighten all hose clamps and check hoses
for leaks.
If any hose (fuel or oil) lines are defective replace them
immediately.

Figure 27. Battery Connections

PAGE 34 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — GENERATOR START-UP PROCEDURE (MANUAL)
Manual Start-up Procedure

Before Starting
CAUTION - LETHAL EXHAUST HAZARD
The engine's exhaust contains harmful emissions.
ALWAYS have adequate ventilation when operating.
Direct exhaust away from nearby personnel.

1. Place the MPEC Control Switch in the MANUAL
position to start the engine (Figure 30).

WARNING - STARTING THE GENERATOR

NEVER! manually start the engine with the main, GFCI
or auxiliary circuit breakers in the ON (closed) position.

Figure 30. MPEC Control Switch
(Manual Position)

1. Place the main, G.F.C.I., and aux. circuit breakers
(Figure 28) in the OFF position prior to starting the engine. 2. Once the engine starts, let it engine run for 1-2 minutes.
Listen for any abnormal noises. If any abnormalities
exists shutdown the engine and correct the problem.

3. Verify that the Engine Running
status LED on the MPEC unit
(Figure 31) is ON (lit) after the
engine has been started.
Figure 28. Main, Aux. and GFCI
Circuit Breakers (OFF)
Figure 31. Engine Running LED (ON)
2. Connect the load to the receptacles or the output
terminal lugs as shown in Figure 13. These load
connection points can be found on the output terminal 4. The generator's frequency meter (Figure 32) should be
displaying the 60 cycle output frequency in HERTZ.
panel and the output terminal panel’s hard wire hookup
panel.
3. The output terminal lugs are protected by a plastic cover.
Remove this cover to gain access to the terminals.
Tighten terminal nuts securely to prevent load wires from
slipping out.
4. Close all engine enclosure doors (Figure 29).

Figure 32. Frequency Meter (Hz)

Figure 29. Engine Enclosure Doors

DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 35

DCA-20SPX — GENERATOR START-UP PROCEDURE (MANUAL)
5. The generator's AC-voltmeter (Figure 33) will display the
generator’s output in VOLTS. If the voltage is not within
the specified tolerance, use the voltage adjustment
control knob (Figure 34) to increase or decrease the
desired voltage.

8. The coolant temperature gauge
(Figure 37) will indicate the
coolant temperature. Under
normal operating conditions the
coolant temperature should be
between 180~221 °F (82~105 °C),
Green Zone.
Figure 37. Coolant
Temperature Gauge

Figure 33. Voltmeter

9. The tachometer gauge (Figure 38)
will indicate the speed of the engine
when the generator is operating.
Under normal operating conditions
this speed is approximately 1800
RPM’s.
Figure 38. Engine
Tachometer Gauge

Figure 34. Voltage Adjust Control Knob

10. Place the main, GFCI, and aux. circuit breakers in the
ON position (Figure 39).

6. The ammeter (Figure 35) will
indicate zero amps with no load
applied. When a load is applied, the
ammeter will indicate the amount
of current that the load is drawing
from the generator.
Figure 35. Ammeter
(No Load)
7. The engine oil pressure gauge
(Figure 36) will indicate the oil
pressure of the engine. Under
normal operating conditions the
oil pressure is approximately 35
to 65 psi. (241~448 kPa). When
starting the generator.

Figure 39. Main, Aux. and GFCI
Circuit Breakers (ON)

Figure 36. Oil
Pressure Gauge

11. Observe the generator's ammeter
(Figure 40) and verify it reads the
anticipated amount of current with
respect to the load. The ammeter
will only display a current reading if
a load is in use.
Figure 40. Ammeter
(Load)
12. The generator will run until manually stopped or an
abnormal condition occurs.

PAGE 36 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — GENERATOR START-UP PROCEDURE (AUTO MODE)
When starting generator in AUTO mode use the "Manual
Start-up" procedure except where noted (see below).

Starting (Auto Mode)
DANGER - ELECTRICAL SYSTEM HAZARDS
Before connecting this generator to any
building’s electrical system, a licensed
electrician must install an isolation
(transfer) switch. Serious damage to the
building’s electrical system may occur
without this transfer switch.
CAUTION - BACKUP GENERATOR USE
When connecting the generator to a isolation (transfer)
switch, ALWAYS have power applied to the generator's
internal battery charger. This will ensure that the engine
will not fail due to a dead battery.

NOTE

1. Perform steps 1 through 5 in the Before Starting section.
2. Place the MPEC Control Switch (Figure 41) in the AUTO
position

Figure 41. MPEC Control Switch (AUTO)
3. Continue operating the generator as outlined in the
Manual Start-up Procedure (start at step 3).

When the generator is set in the
AUTO mode, the generator will
automically start in the event of
comercial power falling below a
prescribed level by means of a
contact closure that is generated
automatically by a transfer switch.

WARNING - AUTO MODE MAINTENANCE
When running the generator in the AUTO mode, remember
the generator can start up at any time without warning.
NEVER attempt to perform any maintenance when the
generator is in the auto mode.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 37

DCA-20SPX — GENERATOR SHUT-DOWN PROCEDURES
WARNING - SHUTTING DOWN THE GENERATOR
NEVER stop the engine suddenly except in an emergency.
Normal Shutdown Procedure
To shutdown the generator use the following procedure:
1. Place both the MAIN, GFCI and LOAD circuit breakers
as shown in Figure 39 to the OFF position.

Emergency Shutdown Procedure
1. Place the MPEC Control Switch switch (Figure 42) to
the OFF/RESET position.
2. To shut-down the engine in the event of an emergency,
switch the MAIN, GFCI and LOAD (Figure 39) circuit
breakers to OFF position.

2. Let the engine cool by running it at low speed for 3-5
minutes with no load applied.
3. Place the MPEC Control Switch (Figure 42) to the
OFF/RESET position.

Figure 42. MPEC Control Switch (Off/Reset)
4. Verify that the all status LED on the MPEC display
are OFF (not lit).
5. Remove all loads from the generator.
6. Inspect entire generator for any damage or loosening of
components that may have occured during operation.

PAGE 38 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — MAINTENANCE
10 Hrs
DAILY

TABLE 11. INSPECTION/MAINTENANCE
Check Engine Fluid Levels

Check Air Cleaner

Check Battery Acid Level

Check Fan Belt Condition

Check for Leaks

Check for Loosening of Par ts

Replace Engine Oil and Filter *
ENGINE

250 Hrs

500 Hrs

Clean Air Filter

Check Fuel Filter/Water Seperator Bowl

Clean Unit, Inside and Outside

Change Fuel Filter

Clean Radiator and Check Coolant Protection Level*2

Replace Air Filter Element *

1000 Hrs

Check all Hoses and Clamps *

X
4

Clean Inside of Fuel Tank

Measure Insulation Resistance Over 3M ohms

GENERATOR
Check Rotor Rear Suppor t Bearing

*1 Replace engine oil anf filter at 100 hours, first time only.
*2 Add "Supplemental Coolant Addatives (SCA'S)" to recharge the engine coolant.
*3 Replace primary air filter element when restriction indicator shows a vaccum of 625 mm (25 in. H20).
*4 If blowby hose needs to be replaced, ensure that the slope of the bloby hose is at least a 1/2 inch per foot, with
no sags or dips that could collect moisture and/or oil.

General Inspection

Service Daily

Prior to each use, the generator should be cleaned and
inspected for deficiencies. Check for loose, missing or
damaged nuts, bolts or other fasteners. Also check for fuel,
oil, and coolant leaks. Use Table 11 as a general maintenance
guideline Engine Side (Refer to the Engine Instruction
Manual)

If the engine is operating in very dusty or dry grass
conditions, a clogged air cleaner will result. This can lead to
a loss of power, excessive carbon buildup in the combustion
chamber and high fuel consumption. Change air cleaner
more frequently if these conditions exists.
Fuel Addition

Air Cleaner
Every 250 hours: Remove air cleaner element and clean the
heavy duty paper element with light spray of compressed
air. Replace the air cleaner as needed.

Add diesel fuel (the grade may vary according to season
and locations).

Air Cleaner with Dust Indicator
This indicator is attached to the air cleaner. When the air
cleaner element is clogged, air intake restriction becomes
greater and the dust indicator signal shows RED meaning
the element needs changing or service. After changing the
air element, press the dust indicator button to reset the
indicator.

Removing Water from the Fuel Tank
After prolonged use, water and other impurities accumulate
in the bottom of the tank. Occasionally inspect the fuel
tank for water contamination and drain the contents if
required.
During cold weather, the more empty volume inside the
tank, the easier it is for water to condense. This can be
reduced by keeping the tank full with diesel
1 fuel.

DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 39

DCA-20SPX — MAINTENANCE
Flushing Out Radiator and Replacing Coolant

Air Removal

If air enters the fuel injection system of a diesel engine,  Open both cocks located at the crankcase side and at
the lower part of the radiator and drain coolant. Open the
starting becomes impossible. After running out of fuel, or
after disassembling the fuel system, bleed the system
radiator cap while draining. Remove the overflow tank
according to the following procedure. See the VOLVO Engine
and drain.
Manual for details.
 Check hoses for softening and kinks. Check clamps for
To restart after running out of fuel, turn the switch to the
signs of leakage.
“ON” position for 15-30 seconds. Try again, if needed. This  Flush the radiator by running clean tap water through
unit is equipped with an automatic air bleeding system.
radiator until signs of rust and dirt are removed. DO NOT
clean radiator core with any objects, such as a
Check Oil Level
screwdriver.
Check the crankcase oil level prior to each use, or when the
fuel tank is filled. Insufficient oil may cause severe damage  Tighten both cocks and replace the overflow tank.
to the engine. Make sure the generator is level. The oil level  Replace with coolant as recommended by the engine
must be between the two notches on the dipstick as shown
manufaturer.
in Figure 31.
 Close radiator cap tightly.
Replacing Oil Filter
 Remove the old oil filter.
 Apply a film of oil to the gasket on the new oil filter.
 Install the new oil filter.
 After the oil cartridge has been replaced, the engine oil
will drop slightly. Run the engine for a while and check
for leaks before adding more oil if needed. Clean
excessive oil from engine.

WARNING - BURN HAZARDS
Allow engine to cool when flushing out
radiator. Flushing the radiator while hot
could cause serious burns from water or
steam.
Generator Storage

Cleaning the Fuel Strainer
Clean the fuel strainer if it contains dust or water. Remove
dust or water in the strainer cap and wash it in gasoline.
Securely fasten the fuel strainer cap so that fuel will not
leak. Check the fuel strainer every 200 hours of operation or
once a month.

For longe term storage of the generator the following is
recommended:

Replacing Fuel Filter

 Clean the entire generator, internal and external.

 Replace the fuel filter cartridge with new one every 500
hours or so.

 Cover the generating set and store in a clean, dry place.
 Disconnect the battery.

 Loosen the drain plug at the lower top of the fuel filter.
Drain the fuel in the fuel body together with the mixed
water. DO NOT spill the fuel during disassembly.

 Make sure engine coolant is at proper level.

 Vent any air.

 Fill the fuel tank completely. Treat with a fuel stabilizer
if necessary.
 Completely drain the oil from the crankcase and refill if
necessary with fresh oil.

 If generator is mounted on a trailer, jack trailer up and
place on blocks so tires do not touch the ground or block
and completely remove the tires.

PAGE 40 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — MAINTENANCE
Jacket Water Heater and Internal Battery Charger
120 VAC Input Receptacles (OPTIONAL)
This generator can be optionally equipped with two 120 VAC,
20 amp input receptacles located on the output terminal
panel.
The purpose of these receptacles is to provide power via
commercial power to the jacket water heater and internal
battery charger.
These receptacles will ONLY function when commercial
power has been supplied to them (Figure 43). To apply
commercial power to these receptacles, a power cord of
adequate size will be required (See Table 6).

If the generator will be used daily, the battery should normally
not require charging. If the generator will be idle (not used)
for long periods of time, apply power to the battery charger
receptacle via commercial power using an power cord of
adequate size.

NOTE

To ensure adequate starting
capability, always have power
applied to the generator's
internal battery charger.

When using the generator in hot climates there is no reason
to apply power to jacket water heater. However, if the
generator will be used in cold climates it is always a good
idea to apply power to the jacket water heater at all times. To
apply power to the jacket water heater simply apply power to
the jacket water heater receptacle via commercial power
using an power cord of adequate size.

Figure 43. Battery Charger &
Jacket Water Heater Power Connections

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 41

DCA-20SPX — TRAILER MAINTENANCE
8. Tire Size - Indicates the diameter of the tire in inches
(10,12,14, etc.), and the width in millimeters
This section is intended to provide the user with generic
(175,185,205, etc.). The tire diameter must match the
trailer service and maintenance information. The service and
diameter of the tire rim.
maintenance guidelines referenced in this section refer to a
wide range of trailers.
9. Tire Ply - The tire ply (layers) number is rated in letters;
2-ply,4-ply,6-ply, etc.
Remember periodic inspection of the trailer will ensure safe
towing of the generator and will prevent personal injury and 10. Wheel Hub - The wheel hub is connected to the trailer’s
damage to the equipment.
axle.
The definitions below describe some of the major components 11. Tire Rim - Tires mounted on a tire rim. The tire rim must
of a typical trailer that would be used with the DCA-20SPX
match the size of the tire.
Whisperwatt™ Generator.
12. Lug Nuts - Used to secure the wheel to the wheel hub.
1. Fuel Cell - Provides an adequate amount of fuel for the
Always use a torque wrench to tighten down the lug
equipment in use. Fuel cells must be empty when transnuts. See Table 16 and Figure 59 for lug nut tightening
porting equipment.
and sequence.
2. Braking System - System employed in stopping the 13. Axle - Indicates the maximum weight the axle can suptrailer. Typical braking systems are electric, surge, hyport in pounds, and the diameter of the axle expressed
draulic, hydraulic-surge and air.
in inches. Please note that some trailers have a double
Trailer Maintenance

3. GVWR- Gross Vehicle Weight Rating (GVWR) is the
maximum number of pounds the trailer can carry, including the fuel cell (empty).
14.
4. Frame Length - Measurement is from the ball hitch to
the rear bumper (reflector).
5. Frame Width - Measurement is from fender to fender
6. Jack Stand - Trailer support device with maximum pound
requirement from the tongue of the trailer.
7. Coupler - Type of hitch used on the trailer for towing.

axle. This will be shown as 2-6000 lbs., meaning two
axles with a total weight capacity of 6000 pounds.
Suspension - Protects the trailer chassis from shocks
transmitted through the wheels. Types of suspension
used are leaf, Q-flex, and air ride.

15. Electrical - Electrical connectors (looms) are provided
with the trailer so the brake lights and turn signals can
be connected to the towing vehicle.
16. Application - Indicates which units can be employed
on a particular trailer.

PAGE 42 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — TRAILER MAINTENANCE
Brakes
Trailer brakes should be inspected the first 200 miles of
operation. This will allow the brake shoes and drums to seat
properly. After the first 200 mile interval, inspect the brakes
every 3,000 miles. If driving over rough terrain, inspect the
brakes more frequently.
Figure 44 displays the major hydraulic surge brake
components that will require inspection and maintenance.
Please inspect these components as required using steps 1
through 8 and Table 15 as listed below:
Brake Adjustment
1. Place the trailer on jack stands. Make sure the jack
stands are placed on secure level ground.
2. Check the wheel and drum for free rotation.
3. Remove the adjusting hole cover from the adjusting slot
at the bottom brake backing plate.
4. With a screwdriver or standard adjusting tool, rotate the
star wheel of the adjuster assembly to expand the brake
shoes.
5. Adjust the brake shoes outward until the pressure of the
lining against the wheel drum makes the wheel difficult
to turn.
6. Adjust, rotate the star wheel in the opposite direction
until the wheel rotates freely with slight lining drag.
7. Replace the adjusting hole cover and lower the trailer to
the ground.
8. Repeat steps 1 through 7 on the remaining brakes.

Hydraulic Surge Brakes
Hydraulic surge brakes (Figure 44) should not require any
special attention with the exception of routine maintenance
such as shoe and lining replacement. Brake lines should be
periodically checked for cracks, kinks, or blockage.

Figure 44. Hydraulic Brake Components
Actuator
Hydraulic surge braking requires the installation of an actuator
at the tongue of the trailer. Remember the surge or push of
the trailer toward the tow vehicle automatically synchronizes
the trailer brakes with the tow vehicle brakes. As the trailer
pushes against the tow vehicle the actuator telescopes
together and applies force to the master cylinder, supplying
hydraulic pressure to the trailer brakes.
Periodically check and test the surge “actuator” to make
sure that it is functioning correctly. Never use an undersize
actuator.

Table 12. Hydraulic Brake Troubleshooting
Symptom

Possible Cause

Solution

No Brakes

Brake line broken or kinked?

Repair or replace.

Brake lining glazed?

Reburnish or replace.

Trailer overloaded?

Correct weight.

Weak Brakes or Brakes Pull to
One Side

Brake drums scored or grooved?

Machine or replace.

Tire pressure correct?

Inflate all tires equally.

Tires unmatched on the same axle?

Match tires.

Brake components loose, bent or broken?

Replace components.

Locking Brakes
Brake drums out-of-round?

Replace.

System lubricated?

Lubricate.

Noisy Brakes
Brake components correct?

Replace and correct.

Brake lining thickness incorrect or not
adjusted correctly?

Install new shoes and
linings.

Enough brake fluid or correct fluid?

Replace rubber par ts
fill with dot 4 fluid.

Dragging Brakes

DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 43

DCA-20SPX — TRAILER MAINTENANCE
Tires/Wheels/Lug Nuts
Tires and wheels are a very important and critical
components of the trailer. When specifying or replacing the
trailer wheels it is important the wheels, tires, and axle are
properly matched.
CAUTION - EYESIGHT HAZARD

Suspension
The leaf suspension springs and associated components
(Figure 45) should be visually inspected every 6,000 miles
for signs of excessive wear, elongation of bolt holes, and
loosening of fasteners. Replace all damaged parts
(suspension) immediately. Torqued suspension components
as detailed in Table 14.

ALWAYS wear safety glasses when
removing or installing force fitted parts.
Failure to comply may result in serious
injury.
CAUTION - REPAIRING TRAILER WHEELS
DO NOT attempt to repair or modify a wheel. DO NOT
install in inner tube to correct a leak through the rim. If the
rim is cracked, the air pressure in the inner
tube may cause pieces of the rim to
explode (break off) with great force and
cause serious eye or bodily injury.
Tire Wear/Inflation
Tire inflation pressure is the most important factor in tire life.
Pressure should be checked cold before operation DO NOT
bleed air from tires when they are hot!. Check inflation
pressure weekly during use to insure the maximum tire life
and tread wear.
Table 13 (Tire Wear Troubleshooting) will help pinpoint the
causes and solutions of tire wear problems.

Figure 45. Major Suspension Components

Table 14. Suspension Torque Requirements
Item

Torque (Ft.-Lbs.)

3/8" U-BOLT

MIN-30 MAX-35

7/16" U-BOLT

MIN-45 MAX-60

1/2" U-BOLT

MIN-45 MAX-60

SHACKLE BOLT
SPRING EYE BOLT

SHOULDER TYPE
SHACKLE BOLT

SNUG FIT ONLY. PARTS MUST ROTATE FREELY.
LOCKING NUTS OR COTTER PINS ARE PROVIDED
TO RETAIN NUT-BOLT ASSEMBLY.

MIN-30 MAX-50

PAGE 44 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — TRAILER MAINTENANCE
Lug Nut Torque Requirements
It is extremely important to apply and maintain proper wheel
mounting torque on the trailer. Be sure to use only the
fasteners matched to the cone angle of the wheel. Proper
procedure for attachment of the wheels is as follows:
1. Start all wheel lug nuts by hand.
2. Torque all lug nuts in sequence (see Figure 46). DO NOT
torque the wheel lug nuts all the way down. Tighten each
lug nut in 3 separate passes as defined by Table 15.
3. After first road use, retorque all lug nuts in sequence.
Check all wheel lug nuts periodically.

Table 15. Tire Torque Requirements
Wheel Size

First Pass
FT-LBS

Second Pass
FT-LBS

Third Pass
FT-LBS

12"

20-25

35-40

50-65

13"

20-25

35-40

50-65

14"

20-25

50-60

90-120

15"

20-25

50-60

90-120

16"

20-25

50-60

90-120

Figure 46. Wheel Lug Nuts
Tightening Sequence

NOTE

NEVER use an pneumatic air
gun to tighten wheel lug nuts.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 45

DCA-20SPX — TRAILER WIRING DIAGRAM

Figure 47. Trailer/Towing Vehicle Wiring Diagram

PAGE 46 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — GENERATOR WIRING DIAGRAM

Figure 48. Generator Wiring Diagram
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 47

DCA-20SPX — ENGINE WIRING DIAGRAM

Figure 49. Engine Wiring Diagram
PAGE 48 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — TROUBLESHOOTING (ENGINE)
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use Table 16 shown below for diagnosis of the engine. If the problem cannot be remedied, consult our company's
business office or service plant.

TABLE 16. ENGINE TROUBLESHOOTING
SYMPTOM

Engine does not star t.

POSSIBLE PROBLEM

SOLUTION

No fuel?

Replenish fuel.

Air in the fuel system?

Bleed system.

Water in the fuel system?

Remove water from fuel tank.

Fuel pipe clogged?

Clean fuel pipe.

Fuel filter clogged?

Clean or change fuel filter.

Excessively high viscosity of
fuel or engine oil at low
temperature?

Use the specified fuel or engine oil.

Fuel with low cetane number?

Use the specified fuel.

Fuel leak due to loose injection
pipe retaining nut?

Tighten nut.

Incorrect injection timing?

Adjust.

Fuel cam shaft worn?

Replace.

Injection nozzle clogged?

Clean injection nozzle.

Injection pump malfunctioning?

Repair or replace.

Seizure of crankshaft, camshaft,
piston, cylinder liner or bearing?

Repair or replace.

Compression leak from
cylinder?

Replace head gasket, tighten cylinder head bolt, glow plug and
nozzle holder.

Improper valve timing?

Correct or replace timing gear.

Piston ring and liner worn?

Replace.

Excessive valve clearance?

Adjust.

Battery discharged?

Charge battery.

Star ter malfunctioning?

Repair or replace.

Key switch malfunctioning?

Repair or replace.

Wiring disconnected?

Connect wiring.

Star ter does not run.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 49

DCA-20SPX — TROUBLESHOOTING (ENGINE)
TABLE 16. ENGINE TROUBLESHOOTING (CONTINUED)
SYMPTOM

POSSIBLE PROBLEM

Engine revolution is not smooth.

Either white or blue exhaust gas
is observed.

Either black or dark gray
exhaust gas is observed.

Deficient output.

SOLUTION

Fuel filter clogged or dir ty?

Clean or change.

Air cleaner clogged?

Clean or change.

Fuel leak due to loose injection
pipe retaining nut?

Tighten nut.

Injection pump malfunctioning?

Repair or replace.

Incorrect nozzle opening
pressure?

Adjust.

Injection nozzle stuck or
clogged?

Repair or replace.

Fuel over flow pipe clogged?

Clean.

Governor malfunctioning?

Repair.

Excessive engine oil?

Reduce to the specified level.

Piston ring and liner worn or
stuck?

Repair or replace.

Incorrect injection timing?

Adjust.

Deficient compression?

Adjust top clearance.

Overload?

Lessen the load.

Low grade fuel used?

Use the specified fuel.

Fuel filter clogged?

Clean or change.

Air cleaner clogged?

Clean or change.

Deficient nozzle injection?

Repair or replace the nozzle.

Incorrect injection timing?

Adjust.

Engine's moving par ts seem to
be seizing?

Repair or replace.

Uneven fuel injection?

Repair or replace the injection pump.

Deficient nozzle injection?

Repair or replace the nozzle.

Compression leak?

Replace head gasket, tighten cylinder head bolt, glow plug and
nozzle holder.

PAGE 50 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — TROUBLESHOOTING (GENERATOR)
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use Table 17 shown below for diagnosis of the generator. If the problem cannot be remedied, consult our
company's business office or service plant.

TABLE 17. GENERATOR TROUBLESHOOTING
SYMPTOM
No Voltage Output

Low Voltage Output

High Voltage Output

Circuit Breaker Tripped

POSSIBLE PROBLEM

SOLUTION

AC Voltmeter defective?

Check output voltage using a voltmeter.

Is wiring connection loose?

Check wiring and repair.

Is AVR defective?

Replace if necessary.

Defective Rotating Rectifier?

Check and replace.

Defective Exciter Field?

Check for 17.3 ohms across J & K on CN1

Is engine speed correct?

Turn engine throttle lever to "High".

Is wiring connections loose?

Check wiring and repair.

Defective AVR?

Replace if necessary.

Is wiring connections loose?

Check wiring and repair.

Defective AVR?

Replace if necessary.

Shor t Circuit in load?

Check load and repair.

Over current?

Confirm load requirements and reduce.

Defective circuit breaker?

Check and replace.

Over current Relay actuated?

Confirm load requirement and replace.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 51

DCA-20SPX — TROUBLESHOOTING (ENGINE CONTROLLER)
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, use Table 18 (Engine Controller Troubleshooting) as a basic guideline for troubleshooting the Microprocessor
Engine Controller unit (MPEC). If the problem cannot be remedied, consult our company's business office or service plant.

TABLE 18. ENGINE CONTROLLER TROUBLESHOOTING (MPEC)
SYMPTOM

POSSIBLE PROBLEM

Low oil pressure light is
on.

Low oil level?

Fill oil level.

Oil pressure sending unit failure?

Replace oil pressure sending unit.

Time delay malfuntion in Controller?

Refer to dealer.

Wire shor ted?

Inspect/repair wire.

Low coolant level?

Fill coolant level.

Low coolant level light is
Sending unit failure?
on. (Optionally Installed)
Low battery voltage?

High coolant temper ture
lig h t i s o n .

SOLUTION

Replace sending unit.
Replace/charge battery.

Fan belt tension incorrect?

Tighten/replace fan belt.

Air flow is not circulation through radiator?

Clean/repair radiator grill.

Doors open?

Close doors.

Exhaust leaking?

Replace/repair gaskets or faulty par t.

Generator being overloaded?

Check/reduce load.

Thermostat failure?

Replace thermostat.

Air intake blocked?

Clear all air intakes.

Temperature switch failure?

Replace temperature switch.

No or low Fuel?

Fill fuel level.

Controller needs to be calibrated?

Refer to dealer.

RPM engine speed too high?

Adjust RPM.

Governor actuator needs to be adjusted?

Adjust governor actuator.

Governor controller needs to be adjusted?

Adjust governor controller.

Engine Controller needs to be calibrated?

Refer to dealer.

Magnetic pick up out of adjustment?

Adjust magnetic pick up.

Magnetic pick up dir ty?

Clean magnetic pick up.

Overcrank light is on.

Overspeed light is on.

Loss of MPU light(s) or
on.

PAGE 52 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

NOTE PAGE

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 53

DCA-20SPX — EXPLANATION OF CODE IN REMARKS COLUMN
The following section explains the different symbols and
remarks used in the Parts section of this manual. Use the
help numbers found on the back page of the manual if there
are any questions.
NOTICE
The contents and part numbers listed in the parts
section are subject to change without notice. Multiquip
does not guarantee the availability of the parts listed.

SAMPLE PARTS LIST
NO.
1
2%
2%
3
4

PART NO. PART NAME
QTY. REMARKS
12345
BOLT......................1 .....INCLUDES ITEMS W/%
WASHER, 1/4 IN............NOT SOLD SEPARATELY
12347
WASHER, 3/8 IN....1 .....MQ-45T ONLY
12348
HOSE ..................A/R ...MAKE LOCALLY
12349
BEARING ..............1 .....S/N 2345B AND ABOVE

NO. Column

QTY. Column
Numbers Used — Item quantity can be indicated by a
number, a blank entry, or A/R.
A/R (As Required) is generally used for hoses or other
parts that are sold in bulk and cut to length.
A blank entry generally indicates that the item is not sold
separately. Other entries will be clarified in the “Remarks”
Column.

REMARKS Column
Some of the most common notes found in the “Remarks”
Column are listed below. Other additional notes needed
to describe the item can also be shown.
Assembly/Kit — All items on the parts list with the
same unique symbol will be included when this item is
purchased.

Unique Symbols — All items with same unique
symbol

Indicated by:
“INCLUDES ITEMS W/(unique symbol)”

(@, #, +, %, or >) in the number column belong to the
same assembly or kit, which is indicated by a note in the
“Remarks” column.

Serial Number Break — Used to list an effective serial
number range where a particular part is used.

Duplicate Item Numbers — Duplicate numbers indicate
multiple part numbers, which are in effect for the same
general item, such as different size saw blade guards in
use or a part that has been updated on newer versions
of the same machine.
NOTICE
When ordering a part that has more than one item
number listed, check the remarks column for help in
determining the proper part to order.

PART NO. Column
Numbers Used — Part numbers can be indicated by a
number, a blank entry, or TBD.
TBD (To Be Determined) is generally used to show a
part that has not been assigned a formal part number
at the time of publication.
A blank entry generally indicates that the item is not sold
separately or is not sold by Multiquip. Other entries will
be clarified in the “Remarks” Column.

Indicated by:
“S/N XXXXX AND BELOW”
“S/N XXXX AND ABOVE”
“S/N XXXX TO S/N XXX”
Specific Model Number Use — Indicates that the part
is used only with the specific model number or model
number variant listed. It can also be used to show a
part is NOT used on a specific model or model number
variant.
Indicated by:
“XXXXX ONLY”
“NOT USED ON XXXX”
“Make/Obtain Locally” — Indicates that the part can
be purchased at any hardware shop or made out of
available items. Examples include battery cables, shims,
and certain washers and nuts.
“Not Sold Separately” — Indicates that an item cannot
be purchased as a separate item and is either part of an
assembly/kit that can be purchased, or is not available
for sale through Multiquip.

PAGE 54 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — SUGGESTED SPARE PARTS
DCA-20SPX WHISPER WATTGENRATOR
W/ISUZU AA-4LE2 DIESEL ENGINE
1 TO 3 UNITS
Qty.
P/N
Description
1 ......... B1312500403 ..... HOSE, RADIATOR UPPER
1 ......... B1312500503 ..... HOSE, RADIATOR LOWER
1 ......... 0602011079 ....... RADIATOR CAP
1 ......... 0605505070 ....... FUEL CAP
1 ......... 0602122272 ....... UNIT, OIL PRESSURE
1 ......... 0602123275 ....... UNIT, WATER TEMPERATURE
6 ......... 8943692993 ....... FILTER, FUEL CARTRIDGE
6 ......... 8944370220 ....... FILTER, FUEL (FUEL PUMP))
6 ......... 8944567411 ....... FILTER, OIL CARTRIDGE
3 ......... 0602046611 ....... FILTER, AIR (ELEMENT)
1 ......... 0601870440 ....... CIRCUIT BREAKER, 1P, 120V @ 20A
1 ......... 0601870441 ....... CIRCUIT BREAKER, 2P, 250V @ 50A
1 ......... LY2DUS12VDC .. RELAY
1 ......... 8972249990 ....... FAN BELT
1 ......... 0601820626 ....... AUTOMATIC VOLTAGE REGULATOR
1 ......... 1601840073 ....... RHEOSTAT
1 ......... 0601840121 ....... KNOB, RHEOSTAT

NOTE

Part number on this Suggested Spare Parts list
may supercede/replace the P/N shown in the text
pages of this book.

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 55

DCA-20SPX — GENERATOR ASSY.
GENERATOR ASSY.

PAGE 56 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX — GENERATOR ASSY.
GENERATOR ASSY.
NO.
1
1-1#
1-2#
1-3#
1-4#
1-5#
1-6#
1-7#
1-8#
1-9#
1-10#
1-11#
2
3
4
4-1
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

PART NO.
B0110100102
7961025004
0601822630
8001070003
8351611004
8351612004
B1112300003
0010310025
0042510000
0601000209
0071906308
0012308035
0070506803
B0130100803
0845041904
8431350003
0016008045
0042508000
8351315003
0017108035
8351312004
8351331004
0017106016
0012310030
B0155400204
0340406040
0041206000
0600815000
0805083204
0207010000

PART NAME
QTY.
REMARKS
ROTOR ASSY. ..................................... 1 ............. INCLUDES ITEMS W/ #
FIELD ASSY. ....................................... 1 ............. NOT SOLD SEPARATELY
RECTIFIER
1
SURGE ABSORBER
1
FAN
1
COUPLING DISC
2
COUPLING HUB WASHER
1
BALANCING PLATE ............................ 1 ............. PURCHASE ITEM 1-10 AS A SET
HEX HEAD BOLT
4
SPRING WASHER
4
BALANCING WEIGHT KIT
1
BEARING
1
HEX HEAD BOLT
6
BEARING
1
STATOR ASSY.
1
GROMMET
1
FIELD ASSY. EXCITER
1
HEX SOCKET HEAD CAP SCREW 3
SPRING WASHER
3
END BRACKET
1
HEX HEAD BOLT
6
PACKING
1
SUCTION COVER
1
HEX HEAD BOLT
3
HEX HEAD BOLT
6
FAN COVER
1
HEX HEAD BOLT
1
PLAIN WASHER
1
NUT
1
RUBBER SUSPENSION
2
HEX NUT
2

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 57

DCA-20SPX— ENGINE OPERATING PANEL ASSY.
ENGINE OPERATING PANEL ASSY.

PAGE 58 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— ENGINE OPERATING PANEL ASSY.
ENGINE OPERATING PANEL ASSY.
NO.
1
2
3
4
5
6
6A
7
8
9
10
11
11A

PART NO.
0602120095
0602122093
0602123090
0602121080
0602125090
0602103092
0601810245
9826800370
0601831330
0601831340
ECU9988N220V
0207004000
0027104040

PART NAME
QTY.
REMARKS
TACHOMETER
1
OIL PRESSURE GAUGE
1
WATER TEMPERATURE GAUGE
1
CHARGING AMMETER
1
FUEL GAUGE
1
ALARM LAMP
1
BULB, DC18V
1
PANEL LIGHT ................................................ 1 ......... REPLACES P/N 0601810141
PANEL LIGHT SWITCH
1
SWITCH
1
CONTROLLER ............................................... 1 .......... REPLACES P/N 0602202545
HEX NUT
2
MACHINE SCREW
2

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 59

DCA-20SPX— CONTROL BOX ASSY.
CONTROL BOX ASSY. (S/N 7800001~7800129)

PAGE 60 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— CONTROL BOX ASSY.
CONTROL BOX ASSY.
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
17A
18
19
20
21
22
23
24
25
26
27
28
29
30
31
31A
32
33
34
35
36
37
37A
37B
38
38A
38B
39

PART NO.
B1214003102
0601870433
0021004075
0601842384
0027104010
0601823240
0027104040
0601815759
0027104020
0601820626
0027105016
0601801123
0027106020
M1213500203
0016906015
0226900450
0016906015
0040506000
M1223000403
0601807641
0601806844
0601801040
0601800271
0601840073
0601840121
M1223100004
0027105010
0027105010
0845056404
0080200007
8973259120
0016906015
0207006000
5825500290
8942481610
0027105016
0601826031
0027104010
PTF08A
LY2DUS12VDC
PYCA1
0601823143
0601824518
PYCA1
0027104020

PART NAME
QTY.
REMARKS
CONTROL BOX
1
CIRCUIT BREAKER 3P, 90 AMPS
1
MACHINE SCREW
4
RESISTOR, 20W 50 OHM
1
MACHINE SCREW
2
RECTIFIER, DE45
3
MACHINE SCREW
1
TERMINAL BOARD
1
MACHINE SCREW
2
AUTOMATIC VOLTAGE REGULATOR
1
MACHINE SCREW
4
CURRENT TRANSFORMER, 150/5A
2
MACHINE SCREW
4
CONTROL BOX COVER
1
HEX HEAD BOLT
4
EDGING
1
HEX HEAD BOLT
8
TOOTHED WASHER
1
CONTROL PANEL
1
FRENQUENCY METER, 45~65Hz 240V
1
AC AMMETER, 0-150A
1
AMMETER CHANGE-OVER SWITCH
1
AC VOLTMETER, 0~300V
1
RHEOSTAT (VR), 2W 1K OHM
1
KNOB
1
STOPPER
1
MACHINE SCREW
2
MACHINE SCREW
4
SET SCREW
1
SNAP RING
1
ENGINE CONTROLLER ................................. 1 ......... REPLACES P/N 0602202523
HEX HEAD BOLT
2
HEX NUT
2
RELAY ............................................................ 2 ......... REPLACES P/N 0602201400
GLOW RELAY ................................................ 1 ......... REPLACES P/N 0602202502
MACHINE SCREW
4
RELAY
1
MACHINE SCREW
2
BASE ............................................................. 1 ......... REPLACES P/N 0601823109
RELAY ............................................................ 1 ......... REPLACES P/N 0601827656
CLIP ............................................................... 1 ......... REPLACES P/N 0601824400
BASE, PYF-08A
2
RELAY
2
CLIP ............................................................... 2 ......... REPLACES P/N 0601824400
MACHINE SCREW
8

DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 61

DCA-20SPX— ENGINE AND RADIATOR ASSY.
ENGINE AND RADIATOR ASSY.

PAGE 62 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— ENGINE AND RADIATOR ASSY.
ENGINE AND RADIATOR ASSY.
NO.
1
1A
1-1
2
3
4
5
6
7
8
9
9-1
9-2
9-3
10
11
12
13
14
15
16
17
17A
18
19
20
21
22
22A
23
24
25
25A
26
27
28
29
30
31
32
33
34
35
36
37

PART NO.
M1923200044
8972249990
8944567411
M1303200304
M1305200204
0010310025
0040010000
0041210000
0605000066
0207010000
M1923200094
0602011079
M9200100904
0150000016
B1312600004
0016908040
0207008000
B1312500403
B1312500503
0605515149
M1310200003
M1310200103
M1493105004
0016908020
M1310300703
M1310300803
0016908020
0602046531
0602046611
0602040690
0602040552
0016908030
0207008000
M1373100303
B1375100613
0605515139
0602022560
M1320300304
0602022561
0603306590
0603300285
0605511395
0603306395
0602021070
0269200280

PART NAME
QTY.
REMARKS
ENGINE, ISUZU AA-4LE2 DA-05
1
FAN BELT ...................................................... 1 ......... REPLACES P/N 0602011430
OIL FILTER CARTRIDGE .............................. 1 ......... REPLACES P/N 0602041210
ENGINE FOOT
1
ENGINE FOOT
1
HEX HEAD BOLT
8
WASHER, LOCK
8
WASHER, FLAT
8
RUBBER SUSPENSION
2
HEX NUT
2
RADIATOR
1
RADIATOR CAP
1
PLUG
1
O-RING
1
RUBBER MOUNT
2
HEX HEAD BOLT
2
HEX NUT
2
RADIATOR HOSE, UPPER
1
RADIATOR HOSE, LOWER
1
HOSE BAND
4
FAN SHROUD
1
FAN SHROUD
1
ACCOUSTIC SHEET
1
HEX HEAD BOLT
8
FAN GUARD
1
FAN GUARD
1
HEX HEAD BOLT
8
AIR CLEANER
1
AIR CLEANER ELEMENT
1
AIR CLEANER INDICATOR
1
AIR CLEANER BRACKET
1
HEX HEAD BOLT
2
HEX NUT
2
AIR CLEANER HOSE
1
AIR CLEANER HOSE
1
HOSE BAND
3
ADAPTER
1
PACKING
1
90 DEGREE ELBOW
1
CONNECTOR
1
ROCKNUT
1
VALVE
1
HOSE JOINT
1
CAP
1
DRAIN HOSE
1

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 63

DCA-20SPX— ENGINE AND RADIATOR ASSY.
ENGINE AND RADIATOR ASSY.

PAGE 64 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— ENGINE AND RADIATOR ASSY.
ENGINE AND RADIATOR ASSY.
NO.
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

PART NO.
1622014103
M9200200004
0150000018
0016906020
0199900600
0199900500
0605515106
0802081403
0802081104
0199100205
M1317100004
0199100350
0193600850
0605515106
0602120481
0602122272
M9200100004
0602123275

PART NAME
DRAIN JOINT
PLUG
O-RING
HEX HEAD BOLT
DRAIN HOSE
DRAIN HOSE
HOSE BAND
RESERVE TANK
RESERVE TANK CAP
HOSE
RESERVE TANK BRACKET
HOSE
HOSE
HOSE BAND
TACHOMETER PICK UP
OIL PRESSURE UNIT
ADAPTER
WATER TEMPERATURE UNIT

QTY.
1
1
1
2
1
1
4
1
1
1
1
1
1
2
1
1
1
1

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 65

DCA-20SPX— OUTPUT TERMINAL ASSY.
OUTPUT TERMINAL ASSY.

THE PART NUMBERS LISTED INDICATE DEFAULT COLOR
OF ORANGE. PLEASE ADD THE FOLLOWING LETTERS
AFTER THE PART NUMBER WHEN ORDERING ANY
OTHER PAINTED PANEL TO INDICATE COLOR OF UNIT:
MQW - WHITE
MQGR - GRAY
MQGRN - GREEN
THE SERIAL NUMBER MAY BE REQUIRED.

PAGE 66 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— OUTPUT TERMINAL ASSY.
OUTPUT TERMINAL ASSY.
NO.
1
2
3
4
5
6
7
8
9
10
11
11A
11B
12
12A
13
14
15
16
17
18
19
20
20-1
21
22
23
24
24A
25
26
27
28
29
30
31

PART NO.
B1231700303
0840312704
0801830604
0039308000
0040008000
0041408000
0016906020
M1236100313
M1236100404
0605010040
0027103010
0030003000
0041203000
0027103010
0030003000
0016906020
0016906015
8085182004
8085183004
0016906020
0601870441
0601870440
M1260700404
0222100080
0016906020
0601812598
0601812565
0027104016
0207004000
M1236100503
0010112045
0041212000
0805009804
0030012000
0601815324
0027104016

PART NAME
TERMINAL PANEL
OUTPUT TERMINAL BOLT
TIE BOLT
HEX BRASS NUT
SPRING WASHER
PLAIN WASHER
HEX HEAD BOLT
TERMINAL COVER
OUTPUT WINDOW
HINGE
MACHINE SCREW
HEX HEAD NUT
PLAIN WASHER
MACHINE SCREW
HEX HEAD NUT
HEX HEAD BOLT
HEX HEAD BOLT
CABLE OUTLET COVER
CABLE OUTLET COVER SUPPORTER
HEX HEAD BOLT
CIRCUIT BREAKER, 2P 50A
CIRCUIT BREAKER, 1P 20A
BREAKER FITTING COVER
RUBBER CUSHION
HEX HEAD BOLT
RECEPTACLE, 125V 20A (GF-530EM)
RECEPTACLE, 250V 50A (CS6369)
MACHINE SCREW
HEX NUT
TERMINAL COVER
HEX HEAD BOLT
PLAIN WASHER
RUBBER STAY
HEX NUT
TERMINAL
MACHINE SCREW

QTY.
1
4
4
8
12
16
4
1
1
2
4
4
4
4
4
2
4
1
1
6
2
2
1
2
2
2
2
8
8
1
2
2
2
2
1
2

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 67

DCA-20SPX— BATTERY ASSY.
BATTERY ASSY.

PAGE 68 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— BATTERY ASSY.
BATTERY ASSY.
NO.
1
2
3
4
5
6
7
8
9A

PART NO.
0602220185
B9310500004
M9103000304
0602220920
0030006000
M1348400204
M2346400104
0017110025
0040510000

PART NAME
BATTERY
BATTERY SHEET
BATTERY BAND
BATTERY BOLT SET
SPRING WASHER
BATTERY CABLE
BATTERY CABLE
HEX HEAD BOLT
TOOTHED WASHER

QTY.
1
1
1
2
2
1
1
3
3

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 69

DCA-20SPX— MUFFLER ASSY.
MUFFLER ASSY.

PAGE 70 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— MUFFLER ASSY.
MUFFLER ASSY.
NO.
1
2
3
4
5
6
7
8
9

PART NO.
B1330101403
0016908020
M1333201703
0602320100
B1333200804
0207008000
0016908035
M1330400204
0016906015

PART NAME
MUFFLER
HEX HEAD BOLT
EXHAUST PIPE
GASKET
GASKET
HEX NUT
HEX HEAD BOLT
COVER
HEX HEAD BOLT

QTY.
1
4
1
1
1
4
4
2
4

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 71

DCA-20SPX— FUEL TANK ASSY.
FUEL TANK ASSY.

PAGE 72 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— FUEL TANK ASSY.
FUEL TANK ASSY.
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
14A
15
16
17
17A
18
19
20
21
22
23
24

PART NO.
M1363000212
0605505070
M1363200004
0805003404
0016908020
0207308000
0222100080
1502025103
0802011104
0150000018
0016906020
M1363400104
0605515064
8943672922
8943692993
M1366700104
0016908020
8970398340
8944370220
0016906025
0191200900
0191200300
0191200650
0191201100
0605515108
0605515064

PART NAME
QTY.
REMARKS
FUEL TANK
1
FUEL TANK CAP
1
TANK BAND
2
SUPPORTER SHEET
4
HEX HEAD BOLT
2
SUPER LOCK NUT
2
RUBBER SHEET
4
DRAIN JOINT
1
DRAIN BOLT
1
O RING
1
HEX HEAD BOLT
2
DRAIN HOSE
1
HOSE BAND
2
FUEL FILTER ................................................. 1 ......... REPLACES P/N 0602042202
FUEL FILTER CARTRIDGE ........................... 1 ......... REPLACES P/N 0602042700
FUEL FILTER BRACKET
1
HEX HEAD BOLT
6
FUEL PUMP ................................................... 1 ......... REPLACES P/N 0602023177
FUEL FILTER ................................................. 1 ......... REPLACES P/N 0602042425
HEX HEAD BOLT
2
SUCTION HOSE
1
SUCTION HOSE
1
SUCTION HOSE
1
RETURN HOSE
1
HOSE BAND
5
HOSE BAND
3

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 73

DCA-20SPX— ENCLOSURE ASSY.
ENCLOSURE ASSY.

PAGE 74 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— ENCLOSURE ASSY.
ENCLOSURE ASSY.
NO.
1
2
3
4
4A
5
6
6A
7
8
9
10
10A
10B
11
12
13
13A
14
14A
15
16
17
18
19
19A
20
21
21A
22
23
24
25
26
26A
27
28
29
29-1
30
31
31A
31B
32

PART NO.
M1413002802
M1413400004
0016908020
M1423001802
M1493104903
0016908020
M1423200304
M1493100604
0019208020
M1433000203
M1433000303
0010114030
0040014000
0041214000
M1443001402
0016908020
M1443300513
M1493300304
M1443301503
M1493300404
0207006000
0019208020
M1443200613
M1443600114
0037906000
0041206000
B9114000002
0021806016
0030006000
0845047104
0845045004
0019208020
0845031504
M1463001702
M1493502903
0019208020
1625165103
1625165204
0016908020
B1454202602
0019108055
0042308000
0042408000
0016908020

PART NAME
BASE
UNDER COVER
HEX HEAD BOLT
FRONT FRAME
ACOUSTIC SHEET
HEX HEAD BOLT
FRONT FRAME COVER
ACOUSTIC SHEET
HEX HEAD BOLT
CENTER FRAME
CENTER FRAME
HEX HEAD BOLT
SPRING WASHER
PLAIN WASHER
REAR FRAME
HEX HEAD BOLT
REAR COVER
ACOUSTIC SHEET
REAR COVER DUCT
ACOUSTIC SHEET
HEX NUT
HEX HEAD BOLT
REAR DOOR
WINDOW PLATE
U NUT
PLAIN WASHER
DOOR HANDLE ASSY.
MACHINE SCREW
HEX HEAD NUT
HINGE
WASHER
HEX HEAD BOLT
BLIND PLUG
ROOF PANEL
ACOUSTIC SHEET
HEX HEAD BOLT
BONNET CAP
CHAIN ASSY.
HEX HEAD BOLT
SPLASHER PANEL
HEX HEAD BOLT
SPRING WASHER
PLAIN WASHER
HEX HEAD BOLT

QTY.
1
1
2
1
1
4
1
1
11
1
1
8
8
8
1
4
1
1
1
1
7
7
1
1
8
8
1
4
4
2
2
3
2
1
1
18
1
1
1
1
2
2
2
2

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 75

DCA-20SPX— ENCLOSURE ASSY. (CONT.)
ENCLOSURE ASSY. (CONT.)

PAGE 76 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— ENCLOSURE ASSY. (CONT.)
ENCLOSURE ASSY. (CONT.)
NO.
33
33A
34
34A
35
35A
36
36A
37
38
39
40
40A
41
42
43
44
45
46
47
48
49
50
50A
51
51A
52
52A

PART NO.
M14530030803
M1493405604
M1453003903
M1493405704
M1453004003
M1493405804
M1453004103
M1493405904
M1453301403
0207006000
B9114000002
0021806016
0030006000
0845047104
0845047204
0845045004
0019208020
0601850097
0027208025
00845031504
0600500090
0021106015
0016910020
0040510000
0016908020
0040508000
0016906020
0040506000

PART NAME
SIDE DOOR
ACOUSTIC SHEET
SIDE DOOR
ACOUSTIC SHEET
SIDE DOOR
ACOUSTIC SHEET
SIDE DOOR
ACOUSTIC SHEET
DUCT
HEX NUT
DOOR HANDLE ASSY.
MACHINE SCREW
HEX HEAD NUT
HINGE
HINGE
WASHER
HEX HEAD BOLT
DOOR STOPPER
MACHINE SCREW
BLIND PLUG
EMBLEM
MACHINE SCREW
HEX HEAD BOLT
TOOTHED WASHER
HEX HEAD BOLT
TOOTHED WASHER
HEX HEAD BOLT
TOOTHED WASHER

QTY.
1
1
1
1
1
1
1
1
1
8
3
12
12
4
4
8
9
8
8
8
1
2
1
1
1
1
1
1

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 77

DCA-20SPX— RUBBER SEALS ASSY.
RUBBER SEALS ASSY.

PAGE 78 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

DCA-20SPX— RUBBER SEALS ASSY.
RUBBER SEALS ASSY.
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

PART NO.
0228901170
0228900695
0228900725
B1491300004
0228800325
0228900370
0228900550
0228900560
0229200595
0228900620
0229200750
0229200740
0228800670
0228800445
0228800485
0228100458
0228100171
0228100351
0228100285
0228100153
0228100180

PART NAME
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL
RUBBER SEAL

QTY.
2
3
1
1
1
1
1
1
1
1
2
1
2
1
1
1
1
1
1
1
1

REMARKS

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 79

DCA-20SPX— NAMEPLATE AND DECALS ASSY.
NAMEPLATE AND DECALS ASSY.

PAGE 80 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

NAMEPLATE AND DECALS ASSY.

DCA-20SPX— NAMEPLATE AND DECALS ASSY.

NAME PLATE ASSY.
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

PART NO.
B1551003203
B1551003303
M1550001803
M1550001904
6360620204
6360610304
6360620104
W0800689504
W0800689404
1320620904
6360620004
B9504000404
1320610603
B9504100104
B9504200004
B9504000304
0840625902
0840614104
0840505604
B9531100604
M9520100503
B9521100404
M9520100404
M1560100403
B1561101604
M1560101604
M1560101704
M1560101804
M9521000004
C9522100003
B2551000403
9039209064
A9504000004

PART NAME
QTY.
REMARKS
DECAL : GENERATOR CONTROL .................................. 1 ........... B15100320
DECAL : ENGINE OPERATING ...................................... 1 ........... B15100330
DECAL : AUXILLARY OUTPUT ....................................... 1 ........... M15000180
DECAL : CAUTION : LIFTING CAP ................................. 1 ........... M15000190
DECAL : OIL DRAIN PLUG ............................................. 1 ........... S-1885
DECAL : WATER .............................................................. 1 ........... S-1880
DECAL : WATER DRAIN .................................................. 1 ........... S-1884
DECAL : - ........................................................................ 1 ........... S-2091
DECAL : + ....................................................................... 1 ........... S-2090
DECAL : DIESEL FUEL .................................................. 1 ........... S-1756
DECAL : FUEL DRAIN PLUG .......................................... 1 ........... S-1883
DECAL : WARNING : POTATING PART. .......................... 2 ........... B90400040
DECAL : WATER * OIL CHECK ....................................... 1 ........... S-1760
DECAL : WARNING : RADIATOR CAP ............................ 1 ........... B90410010
DECAL : WARNING : EXHAUST GAS. ............................ 1 ........... B90420000
DECAL : CAUTION .......................................................... 1 ........... B90400030
DECAL : MQ .................................................................... 1 ........... S-3057
DECAL : GROUND .......................................................... 1 ........... S-2635
DECAL : AMMETER CHANGE-OVER SWITCH ............. 1 ........... N-4590
DECAL : WARNING : ELECTRICAL SHOCK ................... 2 ........... B93110060
DECAL : WARNING ......................................................... 1 ........... M92010050
DECAL : SAFETY INSTRUCTIONS ................................ 1 ........... B92110040
DECAL : DANGER : HIGH VOLTAGE .............................. 1 ........... M92010040
STRIPE : WHISPERWATT
1
STRIPE : 20
2
DECAL : MQ POWER
2
STRIPE
2
STRIPE
2
DECAL : TERMINAL ........................................................ 1 ........... M92100000
CAUTION ......................................................................... 2 ........... C92210000
DECAL : HANDLING PROCEDURES ............................. 1 ........... B25100040
START CONTACT ........................................................... 1 ........... S-4468
DECAL : WARNING : EXHAUST GAS ............................. 1 ........... A90400000

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 81

Effective: February 22, 2006
PAYMENT TERMS

TERMS AND CONDITIONS OF SALE — PARTS
5.

Parts must be in new and resalable
condition, in the original Multiquip
package (if any), and with Multiquip part
numbers clearly marked.

The following items are not returnable:

Multiquip reserves the right to quote and
sell direct to Government agencies, and to
Original Equipment Manufacturer accounts
who use our products as integral parts of their
own products.

SPECIAL EXPEDITING SERVICE

Terms of payment for parts are net 30 days.

FREIGHT POLICY
All parts orders will be shipped collect or
prepaid with the charges added to the invoice.
All shipments are F.O.B. point of origin.
Multiquip’s responsibility ceases when a
signed manifest has been obtained from the
carrier, and any claim for shortage or damage
must be settled between the consignee and
the carrier.

MINIMUM ORDER
The minimum charge for orders from Multiquip
is $15.00 net. Customers will be asked for
instructions regarding handling of orders not
meeting this requirement.

RETURNED GOODS POLICY
Return shipments will be accepted and
credit will be allowed, subject to the following
provisions:
1.

A Returned Material Authorization
must be approved by Multiquip prior to
shipment.

Obsolete parts. (If an item is in the
price book and shows as being
replaced by another item, it is
obsolete.)
Any parts with a limited shelf life
(such as gaskets, seals, “O” rings,
and other rubber parts) that were
purchased more than six months
prior to the return date.

Any line item with an extended
dealer net price of less than
$5.00.

Special order items.

Electrical components.

Paint, chemicals, and lubricants.

Decals and paper products.

Items purchased in kits.

The sender will be notified of any material
received that is not acceptable.

To obtain a Return Material Authorization,
a list must be provided to Multiquip
Parts Sales that defines item numbers,
quantities, and descriptions of the items
to be returned.

Such material will be held for five
working days from notification, pending
instructions. If a reply is not received
within five days, the material will be
returned to the sender at his expense.

The parts numbers and descriptions
must match the current parts price
list.

The list must be typed or computer
generated.

Credit on returned parts will be issued
at dealer net price at time of the original
purchase, less a 15% restocking
charge.

The list must state the reason(s)
for the return.

The list must reference the sales
order(s) or invoice (s) under
which the items were originally
purchased.

The list must include the name
and phone number of the person
requesting the RMA.

A copy of the Return Material Authorization
must accompany the return shipment.

Freight is at the sender’s expense. All
parts must be returned freight prepaid to
Multiquip’s designated receiving point.

10. In cases where an item is accepted, for
which the original purchase document
can not be determined, the price will be
based on the list price that was effective
twelve months prior to the RMA date.

A $35.00 surcharge will be added to the
invoice for special handling including bus
shipments, insured parcel post or in cases
where Multiquip must personally deliver the
parts to the carrier.

LIMITATIONS OF SELLER’S LIABILITY
Multiquip shall not be liable hereunder for
damages in excess of the purchase price of
the item with respect to which damages are
claimed, and in no event shall Multiquip be
liable for loss of profit or good will or for any
other special, consequential or incidental
damages.

LIMITATION OF WARRANTIES
No warranties, express or implied, are
made in connection with the sale of parts or
trade accessories nor as to any engine not
manufactured by Multiquip. Such warranties
made in connection with the sale of new,
complete units are made exclusively by a
statement of warranty packaged with such
units, and Multiquip neither assumes nor
authorizes any person to assume for it
any other obligation or liability whatever in
connection with the sale of its products. Apart
from such written statement of warranty,
there are no warranties, express, implied or
statutory, which extend beyond the description
of the products on the face hereof.

Effective: February 22, 2006

11. Credit issued will be applied to future
purchases only.

PRICING AND REBATES
Prices are subject to change without prior
notice. Price changes are effective on a
specific date and all orders received on or
after that date will be billed at the revised price.
Rebates for price declines and added charges
for price increases will not be made for stock
on hand at the time of any price change.

PAGE 82 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

NOTE PAGE

1
DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10) — PAGE 83

PARTS AND OPERATION MANUAL
OPERATION AND PARTS MANUAL

HERE’S HOW TO GET HELP
PLEASE HAVE THE MODEL AND SERIAL
NUMBER ON-HAND WHEN CALLING
MULTIQUIP CORPORATE OFFICE
18910 Wilmington Ave
Tel. (800) 421-1244
Carson, CA 90746
Fax (800) 537- 3927
Contact: mq@multiquip.com
Web: www.multiquip.com
MQ Power
1800 Water Ridge Rd.
Tel. (800) 883-2551
Suite 500/600
Fax (972) 315-1847
Lewisville, TX 75057
Contact: mqpower@multiquip.com
Web: www.mqpower.com
MQ Parts Department
800-427-1244
310-537-3700

Fax: 800-672-7877
Fax: 310-637-3284

Service/Tech Support/Warranty
800-835-2551
Fax: 310-638-8046
© COPYRIGHT 2010, MULTIQUIP INC.
MQ Power and the MQ Power logo are registered trademarks of Multiquip Inc. and may not be used, reproduced, or altered without written permission. All other trademarks are the
property of their respective owners and used with permission.
This manual MUST accompany the equipment at all times. This manual is considered a permanent part of the equipment and should remain with the unit if resold.
The information and specifications included in this publication were in effect at the time of approval for printing. Illustrations, descriptions, references and technical data contained in
this manual are for guidance only and may not be considered as binding. Multiquip Inc. reserves the right to discontinue or change specifications, design or the information published
in this publication at any time without notice and without incurring any obligations.
Further, MQ Power disclaims any warranties or guaranties, expressed or implied, with regards to the information contained in this manual.

Your Local Dealer is:

Manufactured for
Multiquip Inc.
by
DENYO CO., LTD, JAPAN

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Multiquip Whisperwatt Series Dca 20Spx Users Manual Rev 2

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DCA-20SPX to the manual c3c6443c-5477-4f15-adf4-6eb692bc734b

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