please help!! can't find pressure relief valve 85 mercury 115 hp

darcy61675

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Aug 7, 2015
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Hello all.... First time boat owner here. First time out the trim up button stopped working...as well as a fuel line problem, but i thin we have a handle on that. Got the boat out of water with trim down but don't want to move it again without getting it up. Have read on here about the hydraulic trim pressure relief valve but have had zero luck locating it on my particular motor. 1985 chaparral with mercury 115 hp. I took pictures i can reference....please someone help!!
 

Chris1956

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Mar 25, 2004
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27,036
The location of the manual relief for the PTT depends on the style of the PTT unit. If you have the PTT pump/reservoir located in the boat, it is the knurled knob under the pump. If the PTT is located between the transom clamps, the manual relief is a large slotted screw on the PTT unit, accessed via a hole in the motor transom clamp.
 

darcy61675

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Aug 7, 2015
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Thanks! Can you tell by looking at these pics? Is it the silver thing on the left side?
 

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Chris1956

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Mar 25, 2004
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That PTT system should have the pump/reservoir in the boat. On the bottom of that PTT unit, there is a knurled knob. Turn that knob full CW to allow manual tilt. The tilting will still not be easy, but with some muscle, she will tilt.
 

darcy61675

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Aug 7, 2015
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Thanks chris... I was able to locate the knurled knob inside the boat....turned it and nothing seemed to change? Any further advice? Trying so hard to get on the water.... Thanks
 

Chris1956

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Mar 25, 2004
Messages
27,036
If you turned the knurled knob, the motor will tilt up and down manually. You will need to muscle it up. If she is already up, the manual release will not let it tilt down. You will need the electrics to do that.

Jumper from the red voltage supply on the PTT pump to the green wire on the solenoid to make it trim down.
 
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