wieland77

iTrader: (1)

i have a Fountain 12 meter with SSMIII's and took the boat out last night and my starboard drive would not stay trimmed up when running, it would gradually drop and i would have to keep trimming it out. It stays in place when on the trailer and also when idle speed. No external ram leaks that i can see. Could it only leak when under power? Was late when i got back and wasn't able to check reservoir yet. Any advice on what to look for?

F-2 Speedy

iTrader: (6)

sounds like its possibly bleeding fluid past the ram seals when under a heavy load

wieland77

iTrader: (1)

Yeah, really the only thing it can be, figured if one of the seals were bad it would leak a little while stored but i suppose my only option is to pull em off and have them gone through.

payuppsucker

Isn't there a check valve/ball at/in the pump or am I thinking of another application?

ahlenius

I am having the same problem with my Port SSM#3 fine on trailer' not leaking but wont stay trimmed under load.I believe there is a check valve/ball in the pump that is causing the problem I haven't had a chance to pull my pump apart yet for that side let me know if you resolve the issue i will do the same.

wieland77

iTrader: (1)

Will do, plan to run it this weekend so hopefully get it diagnosed. Let me know what you find if you beat me to it

SutphenL30

If the pump is a prestolite pump (round motor on square plastic base) the problem is the control valve assy. p/n: 90762A2 bolted on the bottom of the pump with 4 bolts & 4 o-rings. The aluminum seat is not sealing the steel ball. This part is NLA from Mercury. This is a very common problem. The best solution is to replace the complete pump assy or a NEW control valve assy. Remember the TRS & SSM drives use a high pressure. The Alpha/Bravo pumps are not compatable. They don't have the pressure to trim under a load. The correct Mercury Oildyne pump p/n: 846859A4 and doesn't have this problem.