Raymarine Autohelm ST6000, Service Manual

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