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Dec 30th, 2023
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 Power tilt & trim loses pressure under load
#13582488
06/04/20 02:28 PM
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Joined: Jul 2013
Posts: 614
diggerwolf
OP
Pro Angler
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OP
Pro Angler
Joined: Jul 2013
Posts: 614 |
Last weekend on the lake my power tilt & trim stopped working under load. It would go up & down just fine while on the ramp or idling in the water, but would drop back down as soon as I accelerated.
Got it home and checked everything as best I could. I do not see any leaks, hydraulic fluid seems to be topped off and no signs of water, operates smoothly and normally with no grinding or weird noises.
The problem seems to be only on the water. Will trim up but will not stay there.
Any ideas?
2003 Skeeter with 2003 Yamaha VMax 3.1L
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!" ― Hunter S. Thompson
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13583528
06/05/20 03:41 AM
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Joined: Apr 2004
Posts: 14,791
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 14,791 |
Might be time for a new pump and motor. I had a Mercury that would not stay tilted from new. Seals on pump replaced under warranty and it would still bleed down on tilt only. Years later after one motor rebuild I bought a new pump and motor and never had another problem.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13583643
06/05/20 11:25 AM
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Joined: Sep 2010
Posts: 1,599
boatwhisperer
Extreme Angler
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Extreme Angler
Joined: Sep 2010
Posts: 1,599 |
first and easiest would be the o rings on the manueltrlrasr valve will need a service manual
boatwhisperer
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13583744
06/05/20 01:21 PM
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Joined: Apr 2008
Posts: 1,417
Big Hopper
Extreme Angler
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Extreme Angler
Joined: Apr 2008
Posts: 1,417 |
I'm glad there are wine drinkers in this world ..... it saves more beer for the rest of us.
Hopper
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13584540
06/05/20 11:13 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
Valve body, manual releive valve or port trim ram.......OPTI
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13604091
06/22/20 04:28 PM
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Joined: Jul 2013
Posts: 614
diggerwolf
OP
Pro Angler
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OP
Pro Angler
Joined: Jul 2013
Posts: 614 |
UPDATE:
Found a mobile boat mechanic who diagnosed and rebuilt the trim motor.
Again, worked fine while on the trailer.
Took it on the water this Saturday and experienced the same problem as before. Will tilt up at a stop, but will not trim up while underway. Tried tilting up while at stop and then applying gas but the motor would drop right back down.
The mobile mechanic agreed to honor his work, but I think he's stumped.
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!" ― Hunter S. Thompson
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13604888
06/23/20 06:58 AM
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Joined: Feb 2015
Posts: 4,740
Flippin-Out
TFF Team Angler
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TFF Team Angler
Joined: Feb 2015
Posts: 4,740 |
You must have a valve/seal leaking somewhere - from the high pressure side of the hydraulic system to the low pressure side, not a leak that drips fluid. If there is a manual pressure relief valve, I would suspect some part of that is not sealing 100%. It holds well enough for the static weight of the motor, but when a heavy load is applied (engine thrust), the seal fails and the bypass leak begins. I'd replace all the seals elsewhere in the system. One has got to be letting pressure get by.
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Re: Power tilt & trim loses pressure under load
[Re: diggerwolf]
#13605416
06/23/20 05:31 PM
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Joined: Apr 2004
Posts: 14,791
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 14,791 |
Did he just rebuild the motor? What about the pump? Like I stated in previous post I had problems with mine from new until I replaced the complete assembly, pump and motor.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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