Chapter 1: Introduction
4000 Mk2 Wheel Drive Service Manual 83158-1
5
4000 mk2 Wheel Drive
Chapter 1:
Introduction
This manual explains the service and maintenance procedures for the Raymarine 4000 Mk2
wheel drive unit.
Note:
For information about servicing the control unit and fluxgate compass, refer
to the ST4000 Plus Autopilots Service Manual (83115-3).
1.1.
Wheel drive functional test
Change damaged components
Check drive ring rotates freely
and belt does not drag
Start
No
Yes
Remove front cover and
visually inspect unit
Rotate drive ring by hand
with clutch disengaged
No
Yes
OK
OK
Check resistance across
motor connector pins is
approximately 1 to 2 ohms
Change/adjust as necessary
No
Yes
Check wiring and connector
OK
Change as necessary
Change as necessary
D5728-1
Connect power supply (see below)
OK
No
Yes
Change/adjust as necessary
Switch on. Check drive ring
moves in opposite direction
to that of first test and
current is less than 2 A
No
Yes
OK
Drive unit OK. End of test.
Switch on. With clutch engaged,
check drive ring moves and
current is less than 2 A
Restrain drive ring rotation until
6.5 A is obtained. Check that belt
does not slip.
OK
No
Yes
Reverse polarity of supply
Restrain drive ring rotation until
6.5 A is obtained. Check that belt
does not slip.
No
Yes
OK
Check gears, belt tension,
eccentrics, drive lever, motor
Change/adjust as necessary
Check gears, belt tension,
eccentrics, drive lever, motor
Check motor
D5727-1
PSU
12 V 15 A
Switch
12 A
Fuse/CB
