1999 yamaha 150 tilt and trim

[spot1955]

note hydraulics will not hold motor up

[spot1955]

note hydraulics will not hold motor up

[TownsendsFJR1300]

Maybe covered already, but the engne HAS TO BE RAISED AND HELD UP on the mechanical bracket (that lets the engine rest while tilted up).

All the rams HAVE TO BE EXTENDED and then the cap removed and filled. To bleed, you'd raise the motor (hydralically), raise it up and down and top off fluid ALWAYS WHILE THE ENGINE IS UP, (all rams extended) held up with the mechanical linkage.

If it won't do that, there's an issue elsewhere.

Good luck..

The only other thing that may possibly work, remove the unit from the bracket. Then use the exact same procedure to bleed the system however, you don't have the weight of the engine on the hydralics. (If you need to manually push the rams in, that's fine while trying to evacuate the air) Once all the air is out, re-install to the main bracket/engine. You can wire direct to a 12 volt battery if easier and reverse wires for the opposite direction..

[spot1955]

I took pin out on main piston motor resting mechanical bracket when I pull smaller pistons oil pressure builds up and oil pours out let go of trim pistons and they go back in a vacuum guess?

[spot1955]

a valve stuck ? open or closed ?

[TownsendsFJR1300]

The filler cap has to be re-installed before doing ANY UP AND DOWN power operations. You shouldn't be loosing a drop, period...

The only time it (the filler cap) should be off is when the pistons are fully out and thats to check or top off fluid.

If they suck back in (with the cap installed) cycle the unit up and down electrically, then top off fluid AGAIN, with the rams extended..

[spot1955]

ok thanks pistons will not move with or with out filler cap. going to take back off and check valves

[TownsendsFJR1300]

ok thanks pistons will not move with or with out filler cap. going to take back off and check valves

While the pistons are out, fill up the unit, WHEN YOU CAN, with fluid into THAT opening (less air to bleed out later)

[spot1955]

yes I did that also filled all 3 cylinders then screw all 3 caps on put back on boat tried to bleed air out unit off going to check something lol hope to find problem

[TownsendsFJR1300]

Its also NOT unusual to have to raise and lower the rams several times to flush out the air(4-5 times generally)

[spot1955]

took unit apart ordered O-rings for gear pump and two small filters I also pulled all three pistons out check them again added oil and put back together and now is working fine so far.

[TownsendsFJR1300]

Excellent, tks for the update..