Merc Trim Pump Problem - Help Please

[Fr. Frank]

Thanks Fr Frank,

I'll look into that connecting point of pump and motor.

The motor is in the up position only to fill the reservoir. It goes down manually because there is no hydraulic pressure in the empty hoses and cylinders.

Okay, I thought you were stuck in the tilted position. Oh, that pump is s'posed to be self-priming/bleeding. Open the manual release valve, and manually move the motor up and down a couple of times with the hoses installed. Now cycle the pump up and down a few times with the valve still open. Now close the valve and cycle the pump a few times again and listen to see if you get any pump pressure at all.

Failing that, do a quickie rebuild of the pump itself. (disassembly, cleaning, inspection, reassembly) The pump is amazingly simple inside.

On my desktop, I've got a diagram of the pump somewhere, from Mercury parts software of about 2006 or so. I'll see if I can capture that and send it to you later today when I go back to the church.