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70 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
5 Installing the ST4000+
5.5 Wheel drive (wheel pilots only)
The Raymarine wheel drive will fit 3, 4, 5, 6, 7 or 8 spoke wheels. It is
designed to operate with steering systems with between 1 to 3.5 turns
lock to lock.
Note: In the following cases, you must fit a rudder position sensor to
your wheel drive system (see page 81):
• If your steering system has significant lost motion that you cannot
correct. (Any play in your boat’s steering will degrade autopilot
performance, so always try to minimize this lost motion.)
• If you are installing the wheel drive on a hydraulic steering system.
Wheel drive – main parts (see page 114 for dimensions)
Installation stages
Installing the wheel drive involves four stages:
1. Drilling the spoke clamp holes in the front cover.
2. Securing the wheel drive to the wheel.
3. Attaching the pedestal bracket.
4. Connecting the drive to the control unit.
Clamp screw,
M5 x 16 mm (x6)
Wheel drive
front cover
Pre-drilled spoke
clamp holes (x2)
Bracket screw,
No 10 x 3/4 inch (x4)
Clutch lever
Motor tube
Cable socket
Cable plug
Bracket pin
Pedestal
bracket
D5402-2
Spoke clamp (x3) Clamp insert (x3)