Scratching my head.. ( Tilt Trim motor )

[MR nova @#25]

I have a pair of Mercruiser Pre-Alpha outdrives. The trim cylinders were rebuilt last summer. Last week both units were working fine during testing in my driveway. At some point the starboard trim motor stopped working so I replaced with spare one. prior to connecting the hoses I tested the unit. Red wire to green fluid came out of one hole, Red wire to blue, fluid came out of the other hole. Refilled the resivior and reconnect the lines and the unit only trims up. I lossened the nuts on the trim cylinders to let the unit come down. Its trims up no problem...

 

[Scott Danforth]

Flip the lines. PRV to raise is set to 2900 psi. PRV to lowe is about 700psi

 

[MR nova @#25]

Flip the lines. PRV to raise is set to 2900 psi. PRV to lowe is about 700psi

Update, I brought in another pair of eye to watch to outdrives, while I energize the green and blue wires directly to the hot... The outdrive only goes up! even when the down wire is energized..... SMH..

 

[Scott Danforth]

Do you have a 3-wire motor or a 2-wire motor?

 

[MR nova @#25]

Do you have a 3-wire motor or a 2-wire motor?

2 blue wire and a green one

 

[MR nova @#25]

2 blue wire and a green one

I replaced the trim pump twice today. same thing. the outdrive only goes up..

 

[Scott Danforth]

2 blue wire and a green one

You put + on green, - on blue and it goes down

You put + on blue, - on green and it goes up

 

[MR nova @#25]

You put + on green, - on blue and it goes down

You put + on blue, - on green and it goes up

My fault Scott..... Its a 3 wiresetup, green and blue coming out of the top of the motor and it gets grounded from one of the threaded post on top.. sorry

 

[Scott Danforth]

If you have a 3-wire motor and putting+ voltage on green makes it go up. You need to pull the motor and either repair it or replace it

 

[MR nova @#25]

Problem solved. replaced the trim cylinders had a spare set. The rebuilt set would extend but it was very difficult push tem back in..