Chapter 1: Introduction; Wheel Drive Functional Test - Raymarine 4000 Mk2 Service Manual

Chapter 1: Introduction

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 ST4000+ control unit and fluxgate compass, refer
to the ST4000 Plus Autopilots Service Manual (83115-3).

1.1. Wheel drive functional test

Start
Remove front cover and
visually inspect unit
OK
Yes
Rotate drive ring by hand
with clutch disengaged
No
OK
Yes
Check resistance across
motor connector pins is
approximately 1 to 2 ohms
No
OK
Yes
Connect power supply (see below)
4000 Mk2 Wheel Drive Service Manual 83158-1
No
Change damaged components
Check drive ring rotates freely
and belt does not drag
Change/adjust as necessary
Check wiring and connector
Change as necessary
Check motor
Change as necessary
Switch on. With clutch engaged,
check drive ring moves and
current is less than 2 A
No Check gears, belt tension,
OK
eccentrics, drive lever, motor
Yes
Change/adjust as necessary
Restrain drive ring rotation until
6.5 A is obtained. Check that belt
does not slip.
No
OK
Yes
Reverse polarity of supply
Switch on. Check drive ring
moves in opposite direction
to that of first test and
current is less than 2 A
Check gears, belt tension,
No
OK
eccentrics, drive lever, motor
Yes
Change/adjust as necessary
Restrain drive ring rotation until
6.5 A is obtained. Check that belt
does not slip.
No
OK
Yes
Drive unit OK. End of test.
12 A
Fuse/CB
Switch
PSU
12 V 15 A
D5728-1
D5727-1
5