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1. I/O Drive Unit
The I/O drive unit comprises a motor with a two-stage spur reduction gearbox.
A single toothed clutch transmits the torque to a recirculating ball screw. The clutch is
held apart by a small spring to ensure the clutch tooth does not 'ratchet1 when
disengaged. The I/O drive unit may be used with all 610 versions of the AH6000
power pilot and both the
SeaTalk ST6000 and ST7000 Autopilots.
Servicing is restricted to motor replacement.
Great care must be taken when servicing to ensure all screws are fully tightened. The
I/O Drive Unit is subjected to high vibration levels and loose screws will quickly work
free.
2. Motor Replacement (No 17)
2.1 Dismantling
- Unscrew the 2 off rear dust cover retaining screws and remove the dust cover.
- Unscrew the 4 off support plate retaining screws complete with washers.
- Carefully remove the support plate sub-assembly complete with Idler gear sub-
assembly and 2 off spacers. Ensure that the support plate is held square during
removal to prevent damage to clutch shaft. It is now possible to remove the
clutch/gear core sub-assembly, spring and plastic bearing from clutch shaft.
- Undo the lock nut of the 4 pin connector and remove.
- Unscrew 2 off front dust cover retaining screws and push connector out of front dust
cover.
- Slide dust cover along girdle tube sub-assembly to provide access to motor sub-
assembly No. 17.
- Desolder the wires from the motor.
- Unscrew the 2 off motor retaining screws complete with washers and remove. Pull
motor away from master plate sub-assembly.
2.2 Reassembly
-Assemble motor sub-assembly (No.17) to master plate sub-assembly and secure
with 2 off screws complete with washers. (Fully tighten).
- Solder the wires to the new motor.
- Assemble connector to front dust cover and secure with lock nut.
- Slide dust cover along girdle tube and assemble to master plate.
Check that the motor and clutch leads are not trapped during assembly.
- Fully tighten the 2 off screws to secure dust cover.
- Reassemble the plastic bearing spring and clutch (gear) core sub-assembly to
clutch shaft.
- Assemble the Idler gear sub-assembly complete with 2 off washers to support plate
sub-assembly.
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