Power Trim making squeal.?

Question

350 mercruiser, alpha outdrive. My power trim/tilt sounds horrible when trimming down. It sounds fine when trimming up. Besides the loud squeal, it works fine up and down. What do you think this could be? Fluid level is ok.

Answer 1

Sounds like the pressure pop off valve is screaming.Are the cylinder rods on the trim assist clean,not corroded,causing binding on the cylinders?When pressure is applied to the rod end of any hydraulic cylinder you have less force because of the rod diameter taking up space of the actual hyd. force.

Answer 2

It's the motor that's noisy, not the hydraulics.

It's probably going to die in the near future. Replace it.