Pressure relief valve on Yamaha Trim/tilt

kiwi_radical

Recruit
Joined
Jun 26, 2003
Messages
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Does anyone know if the pressure relief valve on a 87 Yamaha 70Hp power trim pump is adjustable? If so how? I have a trim motor that seems to overpressure only at the very top of the trim stroke, i.e. when the ram is fully extended and the relief valve should operate, blowing oil past the (repaired) seal on the shuttle valve access plug.
 
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