Started By
Message
locked post

Power Trim Help

Posted on 6/30/11 at 10:21 am
Posted by Tiger-Striped-Bass
The Bay Area
Member since Dec 2004
1266 posts
Posted on 6/30/11 at 10:21 am
Looking for any ideas here.

Power trim motor wouldn't turn the other day on my '06 4-stroke 90 Yamaha. Solenoid would click and power was going out to the trim motor but it would not spin. Used the manual bypass to raise/lower motor. Got home and I took the motor off of the pump (engine fully lifted up). The reservoir at this point is full, and is even a little above the fill tap. No part of the pump or lines are exposed to air. The fluid level stays right below the seam where the motor mates to the pump assy.

Inside the motor I find a lot of black dust from normal brush wear. I clean that out and brighten up the surface of the armature where the brushes contact. Motor works just fine now. Re-coupled it to the pump and the motor runs fine, but the trim doesn't move the hydraulic cylinder/engine.

At this point, I start to wonder if air did somehow get in the system, though I can't figure out how. Further, the motor will hold any position with the bypass closed and will never bleed down. It seems to me that if air were in the system, it would not hold position - you can't budge it either way with the bypass closed. I read online that these are self-bleeding systems, so I do as prescribed and cycle the motor up and down using the manual bypass (only way I can move it). However, if I crack the fill plug, I get fluid, no air. Remember the level when I removed the motor was above the fill tap. Apparently it stays there. So that procedure gets me nowhere. I took the motor back off just to verify the two are meshing together and the coupling is ok. All appears fine.

Obviously, I won't be able to vent air out of the fill tap if the fluid level is above it - I realize that. But remember, this thing has had that much fluid since it was created, so I don't want to drain any, in an attempt to bleed air that may not even exist. I guess the way around that would be to cycle it up and down as before, but bleed any air by cracking the motor from the pump.

I just really can't see how I could have gotten air in the system and I can't see how the cylinder would hold that heavy motor up, if there was air in the system.

You guys have any suggestions?

TIA
Posted by littlePNdaB
Baton Rouge
Member since May 2010
837 posts
Posted on 6/30/11 at 10:50 am to
I will not be of much immediate help, but there was a thread on trim issues not long ago. Here is the LINK. IDK if it will be of considerable help but good luck, boats are a pain in the arse sometimes, but i would never give them up!
Posted by lashinala
End of 565
Member since Jan 2006
5721 posts
Posted on 6/30/11 at 2:19 pm to
Is it possible it's a short in the handle of the trim switch itself? This happened to be once after hours of digging.
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 6/30/11 at 2:39 pm to
quote:

I guess the way around that would be to cycle it up and down as before, but bleed any air by cracking the motor from the pump


I don't think this is necessary. It should be self-bleeding. Could it be that the pump gear sucked up some of that crap and was possibly damaged?
Posted by LanierSpots
Sarasota, Florida
Member since Sep 2010
62237 posts
Posted on 6/30/11 at 6:17 pm to
I know you said you were passed the electrical issue but how did you determine that? By a voltage measurement when you press the switch?

Also, did I read it correctly, it will not go up or down?

The reason I ask is, sometimes the contacts on the relays burn out but still make contact. There is just not enough contact for the amount of current needed to operate the pump. Thus, you will read 12 volts at the pump but there is not enough current to operate it.

Just a thought.

Posted by Kcrad
Diamondhead
Member since Nov 2010
55507 posts
Posted on 6/30/11 at 11:14 pm to
Tiger-Striped-Bass

You fooled the hell out of me with the thread title.
first pageprev pagePage 1 of 1Next pagelast page
refresh

Back to top
logoFollow TigerDroppings for LSU Football News
Follow us on Twitter, Facebook and Instagram to get the latest updates on LSU Football and Recruiting.

FacebookTwitterInstagram