Autohelm Inboard Autopilots (ST6000 and ST7000 systems) Service ...

AutohelmSlide off the carrier assembly and the four planet gears. Finally withdraw the drivenpulley assembly from the drive module.4. Re-assemblyIn all cases rebuilding the unit is a straight reversal of the above procedures, but thefollowing points should be noted:-a) If replacing a drive motor, first ensure that the drive pulley is fitted in the correctorientation (general assembly). Ensure that the motor spindle is degreased and driedthoroughly before bonding the pulley to the shaft with Loctite 601 or equivalentanaerobic adhesive. After bonding, the unit should not be put under power for at leastone hour.b) If replacing the clutch rotor assembly, ensure the rotor can be pulled forward alongthe two dowels against the spring and when released returns hard against themounting cover. If this is not done, the assembly will jam the drive train when the unitis rebuilt. Also after the unit is completely rebuilt check for a metallic click when theclutch voltage is applied and removed showing the clutch is operating correctly.c) When rebuilding from the drive module stage, ensure that the driven pulley, planetgears, washers and carrier are all correctly located and turning freely before and afterthe roll pin securing the carrier to the leadscrew is refitted. Note that extreme caremust be taken to fully support the leadscrew journal when driving the roll pin backinto the carrier. This prevents the leadscrew journal from being bent. Check for freemovements of the ram tube in and out before proceeding further. When refitting theclutch plate assembly ensure that it is engaged correctly with the planet gears beforerefitting the washer and circlip. Check again for free ram tube movement beforerefitting the mounting cover.d) Ensure that all cables are correctly routed, secured and pulled through away frommoving parts.e) Check the correct length drive module, drive motor and product label have beenused.5. Operation with non Autohelm Autopilots (24v systems)It should be noted that the 24V version of the Autohelm linear drive requires a 12Vclutch signal. If used with other manufacturers autopilots, steps should be taken tolimit the voltage supplied to the clutch.6. Functional TestHaving reassembled the drive unit the following functional test (Fig.2) must becompleted.4SeaTalk Service Manual