Trim pump has high pitched noise

[stealthdrummer]

I have a mercury trim pump that today started making a high pitched whine when going up. It also goes up really slow now. Down is normal speed. The fluid was a tad low so I topped it off with no change. The pump also sounds like it is grinding when in the up mode. I am assuming that this means the pump is toast but would like some other opinions. Is there a way to bleed off the cylinders or would this be a waste of time?

 

[SSTKO81]

Re: Trim pump has high pitched noise

The merc pumps have vents at their highest points, so they're really self bleeding. But sounds to me more like the motors in need of a rebuild. It's a fairly simple inexpensive process and well worth it if it fixes the issue. You can prob find the brushes and bearings for a song on ebay