trim question - Maxum Boat Owners Club

twistable_deer · 07-06-2011, 02:22 PM

hello, i have a maxum 1800 mx and i have a question about my trim. my question is if you keep on holding the button even when the trim is as high as it goes can it damage the trim motor?

Thanks

seapuppy · 07-06-2011, 04:10 PM

TD
well...it's probably not good for it to be held while the pressure is being pumped into the rams.....I'd say....it's ok to hold it for maybe a second or two..but not just hang on it!!...

SP

ss3964spd · 07-06-2011, 04:14 PM

I say yes, but have no facts to back up my opinion.

The out drive trim adjustment system is hydraulic and uses an electric motor to drive the hydraulic pump. Each of the rams contain a piston and fluid is present on both sides of it. As you raise or lower the drive the pump supplies fliud under pressure to one side of the piston(s) or the other (depending on if the drive is being raised or lowered) while the fluid other side of the piston is pushed back to the pump res.

Once the ram piston reaches the end of it's travel no more fluid is being displaced but the pump and it's electric motor are still trying to pump fluid. Their is probably some kind of over-pressure by-pass valve built into the hyd pump to relieve an over-pressure situation but I don't know that to be true.

What I do know to be true is the sound of the pump changes once the drive reaches the end of it's travel in either direction. The pump becomes a little louder and runs slower. To my ear it absolutely sounds like it is straining. Continuing to operate the pump while the drive is fully up or down will, I have to believe, over heat the electric motor.

Dan

brianbossman1 · 07-18-2011, 10:17 PM

Most pumps have a check valve that will release pressure back into the tank so the pump won't blow the seal right out, but having said that I wouldn't stand on the switch for very long. Forgive me for asking but, why would one be curious about that?
Brian

twistable_deer · 07-18-2011, 10:21 PM

well i would just like to know because i don't to hold it for long and blowing any seals or the motor. thanks for replying

brianbossman1 · 07-18-2011, 10:48 PM

Quote:

Originally Posted by twistable_deer

well i would just like to know because i don't to hold it for long and blowing any seals or the motor. thanks for replying

Sounds good, I was curious to see if maybe a switch malfunctioned and stuck or something.
Safe boating,
Brian