125 force trim/tilt pump HELP!!

[bigbluedog]

I've rebuilt the pump unit. It works, but still wants to bleed down about 1/2 way. I've replaced the o-rings. The bore was not scored. It works fine to go up and down. Do I need to cycle it thru a few times as i've cycled it about 6x.<br />I used 30wt motor oil. It is a 1989 125hp.<br />HELP!!!

 

[The Marine Doctor]

Re: 125 force trim/tilt pump HELP!!

It sounds like you need a new piston. The reason it stops is because the fluid reaches an equilbrium on either side of it. It then does not allow the fluid to pass through.<br /><br />TMD

 

[clanton]

Re: 125 force trim/tilt pump HELP!!

Did you replace the pilot check valve seals? Pn 820719 from Merc.