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Trim And Tilt for 1988 40hp Johnson

jond999

New member
My trim and tilt unit does not

My trim and tilt unit does not hold. It fades all the way down from the tilt through the trim. J40TTLCCS 1988 Johnson 40HP. Looking for some diagnostic help and repair suggestions. Jon
 
"Assuming the unit is full of

"Assuming the unit is full of fluid, any possibility that the manual release valve is slightly loose?"
 
"The unit is full of fluid. T

"The unit is full of fluid. The manual release is closed. I even pulled it out to make sure it was not damaged. Pump works fine, plenty of pressure. If I understand correctly there are two check valves. One in one of the lift cylinders and one in the pump body itself. My thought is that if the lift is fading through both the tilt and the trim sections the check valve in the pump body is the culprit. Waht do you think?"
 
"Too much to remember, too muc

"Too much to remember, too much to type. I assumed that you had a service manual?"
 
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