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74 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
5 Installing the ST4000+
Securing the wheel drive to the wheel
1. Remove the wheel from the pedestal and place it on top of the
drive unit, with the front of the wheel and drive both facing up.
2. Using the wheel drive template at the end of this book, select the
correct set of spoke clamp inserts for your wheel:
• measure the spoke diameter at a distance of about 135 mm
(5.3 in) from the center of the wheel
• select the appropriate set of inserts: the wheel drive is supplied
with 2 sets of 3 inserts suitable for 12 mm (
1
/
2
in) and 16 mm
(
5
/
8
in) diameter spokes – each insert is marked with its size
3. Fit the first spoke clamp:
• lubricate the spoke with washing-up liquid – so you can slide
the spoke clamp along the spoke to adjust its position
• place the insert on the spoke about 135 mm (5.3 in) from the
wheel center – this distance is not critical as the wheel drive
will self-center as you fit all 3 spoke clamps
• place the spoke clamp onto the insert, making sure that you
have correctly located the clamp insert in the clamp
• locate 2 of the clamp screws (M5 x 16 mm allen-head screws)
• lightly tighten the screws using the 3 mm allen key (supplied)
4. Repeat step 3 to fit the other 2 spoke clamps. As you fit each one,
adjust the position of the wheel relative to the wheel drive so the
holes in the clamp line up with the holes in the cover. As you do
this, the wheel drive will self-center on the wheel.
5. After fitting all 3 spoke clamps, fully tighten the screws.
D5406-1
135 mm (5.3 in)