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Old 08 May 2013, 14:45   #1
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Country: UK - England
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Length: 4m +
Engine: Yam 55
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Advice please on slow power trim?

Hi i need some help/advice please on a power trim conversion that i've done to my old Yamaha 55 outboard. The background is that i've fitted a second hand Yam power trim unit which like the engine is probably early nineties everythings up and running working etc and i've used it a couple of times but the trim/tilt operation is painfully slow at least half the speed that you normally seem to get and it really struggles when it reaches the trim rams.

I've checked the fluid level, carried out several 'bleeding operations' as per searches on the net. Got a good 12v supply to the unit. It sounds like its labouring when its operating so i'm thinking it might be the motor as a mates similiar set up makes a nice little buzz and flies up and down

Any thoughts/suggestions as i've never worked on one before and its 120 miles away now by the coast so i can only get back to it occasionally, regards AL
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Old 08 May 2013, 15:00   #2
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Could be carbon brushes are worn, so not making sufficient contact, etc. Could also be wiring is shot. Might be an option to renew wiring from solenoids to trim motor. Check out if Yamaha still supply carbon brushes for the motor. You'll need to renew rubber 'o' rings if you open it up. Once in check the general condition of the motor. Sometimes corroded components and electrical points, etc. You'll also need the right specification hydraulic fluid, purge of air, etc.

Battery okay? Multimeter is essential before you strip anything.
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Old 09 May 2013, 04:14   #3
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They do.

Don't ask how I know!

Just be aware that you will be a LOT easier removing the entire motor form the PT unit to change brushes - so have a reasonable sized bucket underneath to catch the fluid, as the bottom of the motor also doubles as the header tank...

Also dismantle the motor top in a poly bag or the brush springs will dissappear over the horizon!
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Old 10 May 2013, 09:11   #4
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slow ptt

Well thanks for the advice fellas its much appreciated I'm heading down to it the weekend to have a mess and as suggested I might even remove the unit and bring it back home yet (so I can fupp it up good and proper in the comfort of me own shed ;-) regards AL
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