Mercruiser Trim Pump issue?

[Carter Powell]

I need some help on this one. On my Mercury 260 with a Mercruiser trim pump it won't tilt under power. Works fine with no load. Since the pump is wired directly to the battery thru a solenoid I am thinking the pump motor might be too weak to spin the pump motor. This is the first time I have had this boat on the water since installing a new trim pump. If the hydraulic lines were in the wrong order could this be the problem. Any help is greatly appreciated.

Thanks a bunch, Carter Powell

[Jim Speros]

Yes trim up/out is a higher pressure. Make sure the blue lead on pump motor is your up.

[Jim Speros]

On some pumps the hydraulic ports have a marking just above adapter fitting.

[Carter Powell]

Is the bottom hydraulic port on the single ram unit the UP port.

thanks so much, Carter

[donmac]

you should be able to energize the pump [blue] up wire and see which line jumps to check if you have the right line connected!

[Carter Powell]

I was just wondering if the bottom port on the single ram is the line port that raises the motor.

thanks, Carter

[Jim Speros]

Yes, bottom port is UP on cylinder.

[108]

Your going to have to shim or install a heavier spring for the up circuit bypass.

[Carter Powell]

Thanks Jim, I was pretty sure but at 76 my mind gets a bit foggy at times, thanks again. Carter