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36 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
4 Maintenance & Fault Finding
4.2 General maintenance
CAUTION:
The control unit, fluxgate compass, tiller drive and rudder
position sensor do not contain any user serviceable parts. These
products should be serviced only by authorized Raymarine
service technicians.
Wheel drive
Routine maintenance
After each trip, flush inside the drive unit by inserting a hose pipe
in the free slot on the back cover.
Cleaning the wheel drive
CAUTION:
Do not use mineral-based solvents (such as WD40) to lubricate or
clean the wheel drive as they will damage the material.
We recommend that you complete the following steps each season to
prevent the build-up of salt on the wheel drive bearings and drive belt:
1. Remove the wheel drive from the wheel:
• remove the wheel from the pedestal
• remove the spoke clamp screws
• remove the wheel drive front cover
2. Check inside the drive unit for any signs of damage.
3. Thoroughly flush the wheel drive interior with fresh water to
remove any salt build-up on the bearings and drive belt.
Do not lubricate any part of the wheel drive. It is designed to
run without lubrication.
4. Replace the front cover then fit wheel drive back onto the wheel.
5. Fit the wheel and wheel drive back onto the pedestal.
6. Clean the wheel drive case (using mild detergent if necessary),
then flush thoroughly with fresh water.