Power trim pump problems

[sjksjk]

Hi, My power trim just quit working on a 79 140 hp Mariner. I just bought this boat about 3 weeks ago and have been going thru it fixing stuff, had just about everything under control, and pulled it outside to run the motor with muffs. Got ready to push it back inside and the motor would not raise. The solenoids click, for the raise and lower but I can't hear the pump run. I checked the fluid level, was about 1/2 full I added approx. 8-10 oz., no change. I ohmed both motors at 19-20 ohms each. I suspect a seized pump or motor, as my dash voltmeter takes a pretty good dip when the solenoids click. Could this pump be airlocked? Do you need to bleed the lines? Would it be wiser to replace the whole assembly or do they make rebuild kits? I can't find any M# or manuf info anywhere. How do you reference the unit to a parts vendor? Thank you for any help with this problem, great site. Thanks, Stu

 

[petryshyn]

Re: Power trim pump problems

sjksjk<br /><br />First off, make sure the battery is good. Hate to trouble-shoot, only to find a bad or low battery.<br /><br />>check for voltage to the motor while engaging the tilt button.<br />>check for voltage from green to ground when tilting down<br />>check for voltage from blue to ground when tilting up<br /><br />if you have 10-12v and the motor isn't functioning, suspect the motor. If you don't have voltage, check for corroded and broken leads to the hot side of the solenoids....<br /><br />Click me for motor sales

 

[sjksjk]

Re: Power trim pump problems

Thanks for the input, the battery has enough umpf to start the 140 hp, so I assumed it would be good enough for a little trim pump. I did not check voltages at the motor terminals though. I will check and make sure the solenoids are closing. Stu

 

[MUCSTAK]

Re: Power trim pump problems

Check your tilt limiter switch located near the pivot of the motor. If it is bad or jammed it will go down but not up. If it is OK, trace all your wiring. There are two plug in connectors from your up/down switch in the wiring harness. I think the wires are purple and black. Be sure they are OK. New motors are about $200 and come with the resevoir. I rebuilt mine myself. Tidious task but dooable. Good luck.

 

[sjksjk]

Re: Power trim pump problems

I had the motor springs and brushes replaced, and it works great now. I also have a bad tilt/trim limit switch. The motor will go down but not up without using the "trailer" button. Just have to be carefull when trimming. I broke down and bought a Manual. Thanks for the advice, and great forum. Stu.

 

[MUCSTAK]

Re: Power trim pump problems

Glad you got it fixed. Hope advice helped.