bleeding power trim

[ttherou]

I just received a used power trim unit for an 87 Mercury 115 hp/I6 that I bought used on Ebay. My old unit was very corroded and not worth repairing. The used unit I received is in great shape with no corrosion (fresh water makes all the difference). However, when I bench tested it, I did not realize my battery was virtually dead and I tried backing off on the manual release screw to get the unit to raise/lower. I backed off on it too much and some fluid came out. Would this have introduced air into the system? If so, how do I bleed the system. Once I charged the battery, the main piston raises and lowers fine but the trim pistons are now stuck in the up position.

 

[Laddies]

Re: bleeding power trim

Probable not, the unit is self bleeding anyway fill if and you should be fine

 

[ttherou]

Re: bleeding power trim

Thanks for reply. I lost only a small amount of fluid so it should have plenty to run.I tried cycling it couple of time on the bnech and the trim pistons still don't retract. Would you happen to know if it needs the force of the motor pushing down to complete the bleeding process?

 

[Laddies]

Re: bleeding power trim

It's 2 way hyd so it shouldn't but I geuss I've never tried it

 

[timmathis]

Re: bleeding power trim

Make sure the motor is not locked in the up position.

 

[tgrav]

Re: bleeding power trim

I have the same problem. Did you find any solutions?

 

[jze1212]

Re: bleeding power trim

Mine makes a bit of a gurgling sound, I think that it is low on fluid, So if I top it off it sort of bleeds itself?

 

[studlymandingo]

Re: bleeding power trim

If you run it all the way up and keep holding the switch, you will hear the pitch of the motor change as the bypass opens, this is the recommended method of getting air out of the system.​