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Help with Jack plate

turbogta1

New member
My Hydraulic jack plate wont go all the way down.
Goes all the way up perfect, start to go down and you can hear a different tone out of the pump/manifold assembly, goes down about three inches and comes to a stop while the motor is screaming. I cant seem to find anything to troubleshoot whether it is a piston prob, manifold, or motor problem.

This is a simular pump set-up; http://www.bobsmachine.com/Products/jackplate_hydraulic-pump.cfm

Any help would be greatly appreciated.
 
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