Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...
Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...
Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...
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<strong>Autohelm</strong>1. I/O Drive UnitThe 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 isheld apart by a small spring to ensure the clutch tooth does not 'ratchet1 whendisengaged. The I/O drive unit may be used with all 610 versions of the AH6000power pilot <strong>and</strong> both theSeaTalk <strong>ST6000</strong> <strong>and</strong> <strong>ST7000</strong> <strong>Autopilots</strong>.Servicing is restricted to motor replacement.Great care must be taken when servicing to ensure all screws are fully tightened. TheI/O Drive Unit is subjected to high vibration levels <strong>and</strong> loose screws will quickly workfree.2. Motor Replacement (No 17)2.1 Dismantling- Unscrew the 2 off rear dust cover retaining screws <strong>and</strong> 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 subassembly<strong>and</strong> 2 off spacers. Ensure that the support plate is held square duringremoval to prevent damage to clutch shaft. It is now possible to remove theclutch/gear core sub-assembly, spring <strong>and</strong> plastic bearing from clutch shaft.- Undo the lock nut of the 4 pin connector <strong>and</strong> remove.- Unscrew 2 off front dust cover retaining screws <strong>and</strong> push connector out of front dustcover.- Slide dust cover along girdle tube sub-assembly to provide access to motor subassemblyNo. 17.- Desolder the wires from the motor.- Unscrew the 2 off motor retaining screws complete with washers <strong>and</strong> remove. Pullmotor away from master plate sub-assembly.2.2 Reassembly-Assemble motor sub-assembly (No.17) to master plate sub-assembly <strong>and</strong> securewith 2 off screws complete with washers. (Fully tighten).- Solder the wires to the new motor.- Assemble connector to front dust cover <strong>and</strong> secure with lock nut.- Slide dust cover along girdle tube <strong>and</strong> assemble to master plate.Check that the motor <strong>and</strong> clutch leads are not trapped during assembly.- Fully tighten the 2 off screws to secure dust cover.- Reassemble the plastic bearing spring <strong>and</strong> clutch (gear) core sub-assembly toclutch shaft.- Assemble the Idler gear sub-assembly complete with 2 off washers to support platesub-assembly.SeaTalk <strong>Service</strong> Manual 5
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