A83004_2 Ray Marine St4000+ Service Manual

RayMarine_ST_4000_Service_Manual

autopilot + ST4000+ st4000

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ST4000+ Autopilots

D3730-1

ST4000+ Autopilots Service Manual
For use on
Z326, Wheel Autopilot
Z327, Tiller Autopilot
Z332, Tiller GP Autopilot

Warning
CE Marking of Equipment/Replacement Parts
If the Autohelm equipment under repair, test, calibration, installation or setting to work carries the European CE mark,
only parts and components supplied or approved for such use by Raytheon should be used in order to maintain
compliance with the relevant CE requirements.
Incorporation, use or attachment, by any means, of parts or components not supplied for or not approved for such use by
Raytheon or, if supplied or approved for use by Raytheon, not properly fitted in accordance with instructions published,
provided or recommended by Raytheon, may cause the equipment to malfunction and, in particular, to become unsafe or
to no longer meet the relevant CE requirements. In these circumstances, Raytheon Marine Europe Ltd excludes liability
to the fullest extent permissible in law for any loss or damage including any liability for its contribution to such loss or
damage by its negligent acts or omissions .
ST4000+ Autopilots Service Manual 83115-1

ST4000+ Autopilots

ST4000+ Autopilots Service Manual 83115-1

Contents

Contents
Chapter 1. ST4000+ Control Head ......................................................................................... 1
1.1 PCB Changes ................................................................................................. 1
1.2 Disassembly/Assembly.................................................................................... 2
ST4000+ Control Head spare parts list ........................................................... 3
1.3 PCB Details .................................................................................................... 4
Input/Output Signals (refer to Figure 2. Circuit Diagram) ................................... 4
Circuit Diagram..................................................................................... 5
PCB Layout .................................................................................................. 6
PCB Component list ............................................................................. 7
Chapter 2. Fluxgate Compass Transducer ............................................................................ 9
2.1 Functional test ................................................................................................. 9
2.2 Magnetic deviation .......................................................................................... 9
2.3 Disassembly/assembly ................................................................................... 10
Fluxgate Compass spare parts list................................................................ 10
Chapter 3. Wheel Drive Actuator ......................................................................................... 11
3.1 Wheel Drive Actuator test................................................................................ 11
3.2 Disassembly/assembly ................................................................................... 12
Wheel Drive Actuator spare parts list ............................................................ 13
Disassembly ............................................................................................... 14
Belt removal ....................................................................................... 14
Pinion sprocket removal ...................................................................... 14
Drive lever and eccentric removal ......................................................... 14
Motor removal .................................................................................... 14
Gearbox removal ................................................................................ 15
Gearbox disassembly ................................................................. 15
Assembly ................................................................................................... 16
Gearbox assembly.............................................................................. 16
Motor assembly .................................................................................. 16
Adjustment eccentric assembly ........................................................... 16
Drive lever and eccentric assembly ...................................................... 17
Pinion sprocket and belt assembly ....................................................... 17
Drive ring closure ................................................................................ 17
3.3 Setting Belt Tension ........................................................................................ 18
Tools required: ............................................................................................ 18
Motor drive box ........................................................................................... 18
Motor drive box parts .......................................................................... 19
Procedure ................................................................................................. 19
ST4000+ Autopilots Service Manual 83115-1

ST4000+ Autopilots

Chapter 4.Tiller Drive Actuator ............................................................................................ 21
4.1 Tiller Drive Actuator test .................................................................................. 21
4.2 Disassembly/assembly ................................................................................... 22
Tiller Drive Actuator spare parts list ............................................................... 23
Tiller Drive Actuator GP conversion kit (W003) ............................................... 23
Chapter 5.Tiller Drive Actuator GP ...................................................................................... 25
5.1 Tiller Drive Actuator GP test ............................................................................ 25
5.2 Disassembly/assembly ................................................................................... 26
Tiller Drive Actuator GP spare parts list ......................................................... 27

ST4000+ Autopilots Service Manual 83115-1

Chapter 1. ST4000+ Control Head

Chapter 1. ST4000+ Control Head
1.1 PCB Changes
When a PCB is changed, it may be necessary to set the new PCB to the
required pilot type, ST4000+ Wheel, ST4000+ Tiller or ST4000+ Tiller GP
1. If the instrument is disassembled, fit the reflector, diffuser, elastomers,
LCD and surround to the PCB
2. Apply 12V power to the instrument/PCB assembly
3. Press and hold STDBY for 14 seconds until CAL ? is displayed
4. Momentarily press +1 and -1 together to gain access to extended
calibration (dealer set - up)
5. Advance from the CAL LOCK page to the pilot type page by pressing
DISP
6. Use the +1 and -1 buttons to set the pilot type as required, 4000 WHL
(wheel) or 4000 TILL (tiller)
7. Press STDBY to exit extended calibration
8. Switch off the power supply. Do not disconnect
9. When the pilot is fully powered down, switch the power on again
10.Check that the required pilot type is momentarily displayed before
STANDBY is entered. If not, repeat the set - up procedure. In the case of
a second failure, change the PCB.

ST4000+ Autopilots Service Manual 83115-1 1

1

3

4

2

Figure 1: ST4000+ Control Head exploded view

2 ST4000+ Autopilots Service Manual 83115-1
17 (Note A)

5

6

8 (Note B)

9

10

Notes:
A. Earlier production units have a shim (17) fitted
to aid keypad compression.
B. The castellated top edge of the diffuser (8) fits
under the legs of the LEDs on the top edge of
the PCB (10).
C. It is recommended that a new case seal (12) is
fitted on assembly.

7 (x2)

11 (x3)

1. Facia
2. Keypad
3. Label
4. Window insert
5. LCD surround
6. LCD
7. Elastomer strip (x2)
8. Diffuser
9. Reflector

12 (Note C)

13

11 (x8)

15

10. PCB
11. Retaining screw (x11)
12. Case seal
13. Rear cover
14. Buzzer connector
15. Label
16. Bulkhead gasket
17. Keypad shim (earlier units only)

14

16

D3721-1

ST4000+ Autopilots

1.2 Disassembly/Assembly

Chapter 1. ST4000+ Control Head

ST4000+ Control Head spare parts list
The item numbers refer to Figure 1: ST4000+ Control Head exploded view
Item

Spare Description

Part No.

1

Facia

W115

2

Keypad

Q219

Display kit, including
Label (selection)
Window insert
LCD surround
LCD
Elastomer (x2)

Q220

3
4
5
6
7

Diffuser kit, including
Diffuser
Reflector

W117

8
9
10

PCB

Q221

Fixing kit, including
Screw (x11)

W120

11
12

Case seal

W118

Back cover assembly, including
Back cover

W119

13

14
15
16

Comments

Fit ST4000+ label

ST4000+/ST5000+ PCB

Comes fitted with,
Gortex filter,
Sleeving,
Buzzer and
Buzzer connecter
Fit ST4000+ label

Label (selection)
Bulkhead gasket

W125

Sun cover

D340

Not illustrated

ST4000+ Autopilots Service Manual 83115-1 3

ST4000+ Autopilots

1.3 PCB Details
Input/Output Signals (refer to Figure 2. Circuit Diagram)
Pin No.

Signal

Description

PL1/1

+12V

Nominal 12V dc

PL1/2

0V in

0V

PL1/3

SeaTalk

Intermittent streams of (nominal) 12V pulses

PL2/1

+12V

Nominal 12V dc

PL2/2

0V in

0V

PL2/3

SeaTalk

Intermittent streams of (nominal) 12V pulses

P1

+12V

Nominal 12V dc

P2

0V in

0V

P3

SCRN

0V

P4

Bias

Nominal 2.5V dc (VRESET)

P5

F/GA

+2.5V dc

P6

F/GB

+2.5V dc

P7

Coil drive

AC signal, 17 cycles at 7.9kHz, driven twice
every 1/16 second

P8

Rudder reference
supply

Nominal 5V supply to rudder reference

P9

Rudder reference

0 to 5V dc (nominal) rudder reference output

P10

Rudder reference 0V

0V

P11

SCRN

0V

C+

Clutch

+12V if Autopilot engaged; otherwise 0V

C–

Clutch 0V

0V

MD1

MD1

When Autopilot engaged and depending on
direction of drive, intermittent variable length
pulses, nominal 12V; otherwise 0V

MD2

MD2

When Autopilot engaged and depending on
direction of drive, intermittent variable length
pulses, nominal 12V; otherwise 0V

NMEA in+

NMEA+

Intermittent streams of (nominal) 12V pulses

NMEA in–

NMEA–

0V

4 ST4000+ Autopilots Service Manual 83115-1

Chapter 1. ST4000+ Control Head

D3723-1

Circuit Diagram

Figure 2: Circuit Diagram
ST4000+ Autopilots Service Manual 83115-1 5

ST4000+ Autopilots

PCB Layout

Taken from Drawing No: 4376-001 Issue: P

Date: 03.10.97

Figure 3: PCB Component Layout
6 ST4000+ Autopilots Service Manual 83115-1

D3722-1

Chapter 1. ST4000+ Control Head

PCB Component list

Taken from Drawing No: 4376-001 Issue: P

Date: 03.10.97

D3724-1

ST4000+ Autopilots Service Manual 83115-1 7

ST4000+ Autopilots

8 ST4000+ Autopilots Service Manual 83115-1

Chapter 2. Fluxgate Compass Transducer

Chapter 2. Fluxgate Compass Transducer
2.1 Functional test
Disconnect the Fluxgate from the Autopilot and check continuity as follows:
Cable colour

Connector pin number

Resistance

Screen to blue

2/4

< 10 ohms

Red to green

3/5

< 5 ohms

Red to yellow

3/6

< 5 ohms

Red to screen

3/2

Open circuit

2.2 Magnetic deviation
The Fluxgate Compass requires careful siting if optimum Autopilot
performance is to be acheived. The SeaTalk electronics is able to correct the
compass for most deviating magnetic fields present when the linearisation
procedure is carried out. Any further deviation, introduced after linearisation,
will introduce an error between the Fluxgate and the ship’s compass. This
can be removed by carrying out the linearisation again. If the displayed
deviation is greater than +/– 15 degrees the Fluxgate should be resited.
Note: The linearisation procedure should always be carried out if the
Fluxgate has been exchanged, removed or moved from its original mounting
position.

ST4000+ Autopilots Service Manual 83115-1 9

ST4000+ Autopilots

2.3 Disassembly/assembly
1

2

4

7

8

3

6

1. Cover
2. Seal
3. Pivot retaining screw (x2)
4. Bracket
5. Pivot sub-assembly

5

9

6. Fluxgate sub-assembly
7. Body
8. Body screw (x4)
9. Cable
D3726-1

Figure 4. Fluxgate Compass exploded view

Fluxgate Compass spare parts list
The item numbers refer to Figure 4: Fluxgate Compass exploded view
Item

Spare Description

Part No.

Compass base kit, including
Pivot retaining screw (x2)
Bracket

M096

3
4

Fluxgate sub-assembly, including
Pivot sub-assembly (x2)
Fluxgate sub-assembly

M022

5
6

10 ST4000+ Autopilots Service Manual 83115-1

Comments

Chapter 3. Wheel Drive Actuator

Chapter 3. Wheel Drive Actuator
3.1 Wheel Drive Actuator test
Carry out the passive and active tests detailed in Figure 6.

Fuse/CB
12A
Switch

PSU
12V 15A
D2386-1

Figure 5. Wheel Drive Actuator test connections
Start

Connect power supply
as in Figure 5

Visually inspect unit
OK

No

Change damaged
components

Yes
Rotate drive ring by hand
with clutch disengaged

Switch on, and with clutch
engaged, check drive ring
moves and current is less
than 2A

OK

No

Yes

OK

No

Yes

Check gears,
belt, rollers,
belt tension,
eccentric, drive
lever, motor
Change/adjust
as necessary

Change/adjust
as necessary

Restrain drive ring rotation
until 6.5A is obtained. Check
that belt does not slip.

OK

OK

No

Yes

Check resistance across
motor connector pins 2 and 3
is approximately 1 to 2 ohms
No

Check gears, belt,
rollers, belt
tension, eccentric,
drive lever, motor

Reverse polarity of supply
Check wiring
and connector

Yes
OK

Switch on.Check drive ring
moves in opposite direction
to that of first test and
current is less than 2A

No

Yes
Check motor

OK

No

Yes

Check gears, belt,
rollers, belt
tension, eccentric,
drive lever, motor
Change/adjust
as necessary

Change as
necessary
Restrain drive ring rotation
until 6.5A is obtained. Check
that belt does not slip.

OK

No

Yes
Actuator OK.
End of test
D2390-1

Figure 6. Wheel Drive Actuator test flowchart
ST4000+ Autopilots Service Manual 83115-1 11

1

5

Figure 7. Wheel Drive Actuator exploded view

12 ST4000+ Autopilots Service Manual 83115-1

3(x5)

11

4

16

6 7

17

12

13 22(x4)

18 10 20(x2) 19

2

21

23

8

Large chamfer of
adjustment locking
nut to face
protective cap

24

32

25

33

26

34

27

35 36

13. Adjustment wheel assembly
14. Adjustment locking nut
15. Protection cap
16. Roller screw (x7)
17. Washer (x7)
18. Roller (x7)
19. Pin
20. Shim (x2)
21. Gearbox drive shaft/
gear carrier 'C'
22. Gearbox retaining screw (x4)
23. Gearbox
24. Red motor seal

14 15

1. Drive ring
2. Back mounting plate
assembly
3. Screw (x5)
4. Support plate
5. Belt
6. Bearing
7. Pinion sprocket
8. Roll pin
9. Drive lever
10. Drive wheel assembly
11. Drive eccentric assembly
12. Adjustment eccentric assembly

14 15

9

30

31

D3727-1

25. Flux ring
26. Motor location peg
27. Motor
28. Motor clamp
29. Motor clamp 'O' ring
30. Connector
31. Connector seal
32. Sleeve
33. End cap 'O' ring
34. End cap
35. Sealing cap
36. Connector nut
37. Cable assembly

28 29

37

ST4000+ Autopilots

3.2 Disassembly/assembly

Chapter 3. Wheel Drive Actuator

Wheel Drive Actuator spare parts list
The item numbers refer to Figure 7: Wheel Drive A ctuator exploded view
Item

Spare Description

Part No.

1

Drive ring

N031

2

Back mounting plate assembly

N013

5

Belt

D169

Pinion kit, including
Pinion sprocket
Protection cap
Pin
Shim (x2)

N014

7
15
19
20

Drive lever kit, including
Roll pin
Drive lever

N011

8
9
11

Drive eccentric assembly

N024
N026

–
–
–

Gearbox drive shaft/gear
carrier ‘C’ kit, including
Gearbox drive shaft/
gear carrier ‘C’
Planet gear (x12)
Shim
‘O’ ring

27

Motor

N012

Wiring kit, including
Motor clamp
Motor clamp ‘O’ ring
Connector
Connector seal
End cap ‘O’ ring
End cap
Sealing cap
Connector nut
Cable assembly

Q106

28
29
30
31
33
34
35
36
37

21

Comments

Comes fitted with,
pre-assembled
gearbox, item 23

See Figure 8, item 3
See Figure 8, item 4
See Figure 8, item 2
See Figure 8, item 1

ST4000+ Autopilots Service Manual 83115-1 13

ST4000+ Autopilots

Disassembly
Belt removal
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Insert a wide flat, non-metalic blade into the gap between the drive ring
(1) and the back mounting plate (2). Gently lever the blade to force the
drive ring (1) off the rollers (18) of the back mounting plate (2). Repeat
this action in three to four places around the drive ring (1) in order to
remove.
2. Unscrew and remove the five screws (3). Detach the support plate (4)
from the back mounting plate (2).
3. Remove the belt (5).

Pinion sprocket removal
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Perform actions as described in Belt removal.
2. Lift the pinion sprocket (7) off the gearbox drive shaft/gear carrier ‘C’ (21).

Drive lever and eccentric removal
Refer to Figure 7. Wheel drive actuator exploded view.
1. Perform actions as described in Pinion sprocket removal.
2. Place a block with a suitable clearance hole under the drive lever/shaft
(9) to provide support and prevent the shaft bending when the roll pin is
driven out.
3. Drive out the roll pin (8).
4. Pull the drive lever (9) off the drive eccentric shaft (11).
5. Lift the drive eccentric assembly (11) and drive wheel assembly (10) off
the back mounting plate (2).

Motor removal
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Unscrew and remove the connector nut (36).
2. Remove the sealing cap (35).
3. Grip the gearbox (23), unscrew and remove the sleeve (32) ensuring the
connector does not rotate.
4. Withdraw motor (27)/location peg (26) disengaging it from the gearbox
(23). Slide off the flux ring (25).
Note: Although given separate item numbers, the gearbox (23) is an
integral part of the back mounting plate assembly (2) and the location
peg (26) is part of the motor (27).
14 ST4000+ Autopilots Service Manual 83115-1

Chapter 3. Wheel Drive Actuator

5. Desolder connector wires from the motor tags.

Gearbox removal
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Perform actions as described in Pinion sprocket removal,
and 1, 2, 3 and 4 in Motor removal.
2. Unscrew and remove the four gearbox retaining screws (22).
3. Separate the gearbox ( 23) from the back mounting plate assembly (2)
leaving the gearbox drive shaft/gear carrier ‘C’ (21) in place.
4. Support the gearbox drive shaft/gear carrier ‘C’ (21) and drive out the pin(19).
5 Withdraw the gearbox drive shaft/gear carrier ‘C’ (21) from the back
mounting plate assembly (2).

Gearbox disassembly

8

5
5

5
5

4

4
4

7

5
5

3

4
5
4

6

2
1

7
1. 'O' ring
2. Small shim spacer
3. Drive shaft/carrier assembly 'C'
4. Planet gear (x22)

5. Large shim spacer (x7)
6. Carrier assembly 'B'
7. Carrier assembly 'A' (x2)
8. Gear housing
D3725-1

Figure 8. Gearbox exploded view

ST4000+ Autopilots Service Manual 83115-1 15

ST4000+ Autopilots

Assembly
In all cases, assembly is a straight reversal of the steps described in
Disassembly.

Gearbox assembly
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Rebuild gearbox. Refer to Figure 8. Gearbox exploded view
2. Fix the gearbox (23) to the back mounting plate assembly (2) using the
four gearbox retaining screws (22).
3. Slide the two shims (20) over the gearbox drive shaft/gear carrier ‘C’ (21)
and hard up against the back mounting plate assembly (2).
4. Support the gearbox drive shaft/gear carrier ‘C’ (21) and refit the pin (19).
Note: If the original pin (19) is bent or damaged a replacement pin can be
obtained from pinion kit, part no. N014.

Motor assembly
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Fit the red motor seal (24) over the threaded end of the gearbox (23).
2. Insert the connector wires through the motor clamp (28), and solder the
connector wires to the motor tags – red lead to the tag with a red spot,
black lead to the other motor tag.
3. Slide flux ring (25) on the motor (27) and fit onto the gearbox (23)
ensuring that the motor drive gear is fully engaged with the gear train and
the motor location peg (26) is engaged correctly into the gearbox (23).
4. Fit the ‘O’ ring (29) onto the motor clamp (28).
5. Place the connector seal (31) over the connector (30).
6. Screw the sleeve (32) with fitted ‘O’ ring (33) and end cap (34) onto the
gearbox (23).
7. Place the sealing cap (35) over the connector (36) and secure with the
connector nut (37).

Adjustment eccentric assembly
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Assemble the adjustment wheel assembly (13), adjustment eccentric
assembly (12), adjustment lock nut (14) with its chamfered edge facing
outwards, and protection cap (15) to the back mounting plate assembly (2).
Note: Ensure that the drive lever (9) is in the slack (declutched) position
and the adjustment eccentric assembly (12) is in its lowest position, so
that the belt (5) is at its slackest.

16 ST4000+ Autopilots Service Manual 83115-1

Chapter 3. Wheel Drive Actuator

Drive lever and eccentric assembly
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Assemble the drive eccentric assembly (11) and drive wheel assembly
(10) to the back mounting plate assembly (2).
2. Slide the drive lever (9) onto the drive eccentric assembly (11). Support
the drive lever (9) and insert the roll pin (8).
Note: Always use a new roll pin (8) on refit.

Pinion sprocket and belt assembly
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Slot the pinion sprocket (7) over the gearbox drive shaft (21) and pin (19).
2. With the drive lever (9) in its slack (declutched) position and the
adjustment eccentric assembly (12) is in its lowest position fit the belt (5)
around the pinion sprocket (7), drive wheel assembly (10) and
adjustment wheel assembly (13).
3. Position the support plate (4) with fitted bearing (6) onto the gearbox
drive shaft (21), drive eccentric assembly (11), adjustment eccentric
assembly (12) and over the screw pillars. Insert the five screws (3) and
secure the support plate (4).
Note: Take care not to cut new threads in the screw pillars when securing
the support plate (4).

Drive ring closure
Refer to Figure 7. Wheel Drive Actuator exploded view.
1. Rest the drive ring (1) over the rollers (18).
2. Locate the rollers (18) nearest the gearbox (23) into the groove of the
drive ring (1). Push down and around the drive ring (1) to progressively
snap the drive ring (1) over the remaining rollers (18).
3. Spin the drive ring (1) in both directions, two or three times, too ensure
the assembly is fully seated and free running.

ST4000+ Autopilots Service Manual 83115-1 17

ST4000+ Autopilots

3.3 Setting Belt Tension
The purpose of the belt tensioning procedure is to ensure that:
1. The belt is sufficiently tight to transmit the normal maximum drive
torques.
2. The belt is not over-tightened, as this will increase the backdrive load to a
level where it can be felt on the vessel’s wheel.

Tools required:
4000 Drive unit torque fixture
Service tool number - T033
4000 Drive unit torque adjuster
Service tool number - T032
Motor drive box and ammeter

Motor drive box
SW1
FS1

IC1
LM396K

15A

R1
121R

Red (ZO78)
Brown (Z077)

12V
BATTERY

ACTUATOR
D1
MR752

+ C1
4700uF

+ C2
4.7uF

R2
845R

+ C3
22uF

+ C4
4.7uF

R3

Blue

1KO

D2384-1

Figure 9. Motor drive box circuit diagram

18 ST4000+ Autopilots Service Manual 83115-1

Chapter 3. Wheel Drive Actuator

Motor drive box parts
Component

Description

R1

Resistor

121R 0.1% metal film

R2

Resistor

845R 0.1% metal film

R3

Resistor

1k0 0.5W

C1

Capacitor

4700uF 20% electrolytic 25V

C2

Capacitor

4.7uF 10% solid tantalum 35V

C3

Capacitor

22uF 10% solid tantalum 35V

C4

Capacitor

4.7uF 10% solid tantalum 35V

D1

Diode

MR 752

IC1

LM396K

High power 10A regulator

F1

Fuse
15A quick blow
Fuseholder 1.1/4 inch

SW1

Switch
Single pole single throw
TO3
Insulating kit
Diecast box

Procedure
1. Screw the drive ring clamp to the front ring. Use the group of two holes on
their own, not two holes in a group of four. Screw the torque restraint pin
into the back mounting plate
2. Connect the motor to the motor drive box, using an in - line ammeter (0 10 amps) to measure current
3. Connect the motor drive box to a 12V battery. The drive box provides a
regulated 10.5V supply to the motor
4. Engage the drive unit clutch
5. Use the eccentric adjuster to loosen (anti - clockwise) the locking nut and
allow the eccentric to move to the minimum tension position
6. Switch on the drive to the motor and, using a 1.5mm Allen key, rotate the
eccentric anticlockwise (as viewed from above) to increase belt tension
until the belt just stops slipping (motor stalled)
7. Check that the motor current is approximately 6.5 amps
8. Tighten the locking nut, apply Loctite to retain the setting and switch off
the motor drive.

ST4000+ Autopilots Service Manual 83115-1 19

ST4000+ Autopilots

20 ST4000+ Autopilots Service Manual 83115-1

Chapter 4. Tiller Drive Actuator

Chapter 4. Tiller Drive Actuator
4.1 Tiller Drive Actuator test
Carry out the passive and active tests detailed in Figure 11.Tiller Drive Actuator
test flowchart.

Blue

Fuse/CB
12A

1
2

3

Brown
Blue

Switch

Brown

Actuator deck plug
PSU
12V 15A

D2394-1

Figure 10.Tiller Drive Actuator test connections

Start
Connect power supply
as in Figure 10.

Visually inspect unit
OK

No

Change damaged
components

Yes

Switch on,
check thrust rod moves and
current less than 2.5A

Extend and retract
thrust arm by hand
OK

OK

No

Check gears,
thrust rod,
actuator body,
motor

No

Yes

Change
as necessary

Yes
Change
as necessary
Check resistance across
motor connector pins 2 and 3
is approximately 1 to 2 ohms

OK

No

Check wiring
and connector

Check gears,
thrust rod,
actuator body,
motor

Switch off.
Reverse connections to PSU

Switch on.
Check thrust rod moves
in opposite direction
to that of first test and
current less than 2.5A

Yes
OK

No

Yes
Check motor

OK

No

Yes

Check gears,
thrust rod,
actuator body,
motor

Change
as necessary

Change as
necessary
Actuator OK.
End of test

D3728-1

Figure 11. Tiller Drive Actuator test flowchart
ST4000+ Autopilots Service Manual 83115-1 21

9. Flux ring
10. Motor sleeve
11. End cap assembly
12. Cable clamp
13. Clamp seal
14. Cable clamp nut
15. SeaTalk deck plug

Figure 12. Tiller Drive Actuator exploded view

22 ST4000+ Autopilots Service Manual 83115-1

1

8

Notes:
A. Ensure cable clamp nut (14) is unscrewed before
undoing the motor sleeve.
B. The hole in the gear annulus (7) that accepts the
drive gear of the motor (8) is of a different diameter
to that of the ST4000+ GP gear annulus.
C. Care should be taken not to cross-thread the
annulus (7) when screwing into the thrust tube (2).

1. Ram cap
2. Thrust tube
3. Lead screw assembly
4. Planet gear (x4)
5. Shim
6. 'O' ring (x3)
7. Gear annulus
8. Motor (Q114)

9

2

10

15

6

11

3

14
Note A

ST4000+ GP
16mm diameter

End view of Annulus (7)

13

6

ST4000+
13mm diameter

12

4 (x4)

5

7
Notes B & C

6

D2395-1

ST4000+ Autopilots

4.2 Disassembly/assembly

Chapter 4. Tiller Drive Actuator

Tiller Drive Actuator spare parts list
The item numbers refer to Figure 12: Tiller Drive Actuator exploded view
Item

Spare Description

Part No.

Comments

Drive module

Q047

Complete drive unit

8

Motor

Q114

11

End cap assembly

W014

Tiller Drive Actuator GP conversion kit (W003)
This GP conversion kit (W003) gives the option of converting the ST4000+
which has the power to helm boats of up to 6,500 kg (14,300 lbs)
displacement, to the ST4000+ GP which would push the limit up to 9,000 kg
(20,000 lbs) displacement.
1

2

3

4

3

5

6

7

1. Planet gear (x4)
2. Shim
3. 'O' ring (x3)
4. Gear annulus
5. Motor
6. Motor spacer
7. Cable tie
8. Motor sleeve
9. End cap assembly

8

3

9
D2397-1

Figure 13. Tiller Drive Actuator GP conversion kit (W003)

ST4000+ Autopilots Service Manual 83115-1 23

ST4000+ Autopilots

24 ST4000+ Autopilots Service Manual 83115-1

Chapter 5. Tiller Drive Actuator GP

Chapter 5. Tiller Drive Actuator GP
5.1 Tiller Drive Actuator GP test
Carry out the passive and active tests detailed in Figure 15.Tiller Drive Actuator
GP test flowchart.

Blue

Fuse/CB
12A

1
2

3

Brown
Blue

Switch

Brown

Actuator deck plug
PSU
12V 15A

D2398-1

Figure 14.Tiller Drive Actuator GP test connections

Start
Connect power supply
as in Figure 10.

Visually inspect unit
OK

No

Change damaged
components

Yes

Switch on,
check thrust rod moves and
current less than 2A

Extend and retract
thrust arm by hand
OK

OK

No

Check gears,
thrust rod,
actuator body,
motor

No

Yes

Change
as necessary

Yes
Change
as necessary
Check resistance across
motor connector pins 2 and 3
is approximately 1 to 2 ohms

OK

No

Check wiring
and connector

Check gears,
thrust rod,
actuator body,
motor

Switch off.
Reverse connections to PSU

Switch on.
Check thrust rod moves
in opposite direction
to that of first test and
current less than 2A

Yes
OK

No

Yes
Check motor

OK

No

Yes

Check gears,
thrust rod,
actuator body,
motor

Change
as necessary

Change as
necessary
Actuator OK.
End of test

D3731-1

Figure 15.Tiller Drive Actuator GP test flowchart
ST4000+ Autopilots Service Manual 83115-1 25

9. Cable tie
10. Motor spacer
11. Motor sleeve
12. End cap assembly
13. Cable clamp
14. Clamp seal
15. Cable clamp nut
16. SeaTalk deck plug

Figure 16. Tiller Drive Actuator GP exploded view

26 ST4000+ Autopilots Service Manual 83115-1

1

8

Notes:
A. Ensure cable clamp nut (15) is unscrewed before
undoing the motor sleeve.
B. The hole in the gear annulus (7) that accepts the
drive gear of the motor (8) is of a different diameter
to that of the ST4000+ gear annulus.
C. Care should be taken not to cross-thread the
annulus (7) when screwing into the thrust tube (2).

1. Ram cap
2. Thrust tube
3. Lead screw assembly
4. Planet gear (x4)
5. Shim
6. 'O' ring (x3)
7. Gear annulus
8. Motor

9

10

2

11

16

6

12

3

14

6

15
Note A

ST4000+
13mm diameter

ST4000+ GP
16mm diameter

End view of Annulus (7)

13

4 (x4)

5

7
Notes B & C

6

D2396-1

ST4000+ Autopilots

5.2 Disassembly/assembly

Chapter 5. Tiller Drive Actuator GP

Tiller Drive Actuator GP spare parts list
The item numbers refer to Figure 16: Tiller drive actuator GP exploded view
Item

4
5
6
7
8
9
10
11
12

Spare Description

Part No.

Comments

Drive module

Q086

Complete drive unit

ST4000+ GP kit, incuding
Planet gear (x4)
Shim
‘O’ ring (x3)
Annulus
Motor
Cable tie
Motor spacer
Motor sleeve
End cap assembly

W003

Serves as an upgrade
conversion kit for the
ST4000+ tiller drive
actuator.

ST4000+ Autopilots Service Manual 83115-1 27

ST4000+ Autopilots

28 ST4000+ Autopilots Service Manual 83115-1

ST4000+ Autopilots

ST4000+ Autopilots Service Manual 83115-1

ST4000+ Autopilots

Raytheon Marine Company
676 Island Pond Road
Manchester
New Hampshire 03109-5420
Tel: (001 603) 647 7530
Fax: (001 603) 634 4756

Raytheon Marine Europe Limited
Anchorage Park, Portsmouth
Hampshire PO3 5TD
Tel: (01705) 693611
Fax: (01705) 694642
http: //www.raytheon.com

ST4000+ Autopilots Service Manual 83115-1



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