Thanks to those who responded with sensible advice
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With time on our hands we bit the bullet first pulling the motor apart and discovered that the small springs holding the brushes in place needed a tweak so they applied more pressure to their task
Then we pulled the arm apart including the small ball bearings gave all a good clean then applied lithium grease. Delicate and slow work to get the ball bearings in place. (Same system as the steering in a David brown tractor)
Whole job took about 6 hours but the auto pilot is working again......whew!!!
There is a shipment of motors and arms heading to NZ in early August......nga Waka’s name is on one of them
Thanks again for the collective advice
John Hayes Sn 41
On 21/07/2019, at 7:55 AM, Danny and Yvonne SIMMS <email@example.com> wrote:
Hi John, 7 days hand steering is not much fun, I feel for you. My ray marine auto helm stopped functioning once when we were transiting French Polynesia and there was limited help available. All those technicians I could find advised all sorts of expensive replacements. A wise long time cruiser said check the electrical connections to the linear drive. He was right, they were wrong. There was a corroded wire joint. I had wasted two weeks waiting for parts to be delivered. Although two weeks in Raeatea isn't too painful. My fist lesson. Many many faults on our boats systems are caused by simple connection corrosion.
On 20 July 2019 at 20:22 JOHN HAYES <firstname.lastname@example.org> wrote:
Nga Waka reached Nuku’alofa this afternoon after a slow head wind slog from Wellington; the last 7 days hand steered
The system on the yacht is a Raymarine ST6002 and has been very satisfactory.......until now! It’s a Non hydraulic system and we guess the problem may be brushes in the linear actuator.
Whether or not we can do a repair here in Nuku’alofa I’d like to purchase a second system to install so we might avoid the situation over the past week.
In that context has any one out there purchased an auto helm they find satisfactory and could you please provide a brand and model number.
Thanks for any help or advice anyone might supply
John Hayes sn 41