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Old 01-02-2012, 22:38   #1
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Autohelm CR 2

Can anyone help me find a drawing breaking down the Atouhelm CR 2 12v 4.1litre/min unit. We have a broken wire just inside the casing of the electric motor and cannot seem to get the end cap off the motor to repair. Removed brushes and end bolts holding maotor case together but something will not let the cap come off the motor. The motor is mounted on the backside of a bracket which seems to hold the main reservoir and pump onto the assembly. Do not want to play around to much as I do not know if the reservoir is sealed onto the backside of this bracket. The motor shaft will not pull out of pump even though it will come forward about 2-3 inches before stopping. Must be a final drive mounted on the shaft which interfaces with the pump but there is no oil coming from this point. I have attached a picture of the unit and hopefully someone has a detailed assembly drawing. This unit was originally made by Nautech Ltd, Portsmouth England which is now Raymarine.

The motor driving the unit is a Hastings, again made in England.

Many miles to go to get to Singapore and it would be nice to have the Autopilot working again. The break in the wire is just no accesible from outside the motor case to be repaire without taking the motor apart,

Any help would be appreciated.
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Old 02-02-2012, 15:49   #2
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Join Date: May 2007
Location: Colorado; Sailing Sea of Cortez
Boat: Tartan 33R
Posts: 174
Re: Autohelm CR 2

from the service manual, hope this helps

2. Constant Running Power
The constant running hydraulic power pack provides a drive unit for larger vessels with steering cylinder displacements above 400cc. The power pack motor is switched independently of the autopilot and runs continuously. When rudder movement is required, the solenoid valves are energised by the course computer to direct the flow to the steering cylinder. The servicing information allows replacement of the solenoid valve assembly, inspection and cleaning of the check valve and relief valve assembly and seal replacement. It is not possible to service the pump and filter assembly which are contained within the reservoir as the reservoir seal requires special assembly techniques.

2.1 Dismantling and Reassembly
a) To remove the solenoid valve, undo the four caphead bolts securing it to the
manifold. Remove the valve carefully to ensure the 0 ring seals are not lost.
Reassembly is a simple reversal of this procedure.

b) To clean the check valve assembly, unscrew the cartridge and remove it along
with the washer and 0 ring seal. The spring and ball can then be taken out. The seat and 0 ring will probably remain in position and oil from the reservoir is likely to wash out any dirt that could have been causing problems. If the check valve assembly is further dismantled, care must be taken when reassembling to prevent damage to the 0 rings. The best method is to place the 5/ Sin. 0 ring and seat in the manifold and screw in the cartridge (without the ball or spring) to position the seat within its sealing ring. The cartridge can then be removed and the ball and spring positioned within the cartridge. Some grease may be used to retain them whilst the cartridge with its 0 ring and washer is screwed into position.

c) If the relief valve assembly is removed, the relief valve setting should be checked after reassembly. The factory pre-set is 750 psi.

d) Ensure all parts are reassembled in the current sequence and nothing is missed out during reassembly.

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