Question about V, Inc. Dump Trailer Pump 12v Dc Double Acting Hydraulic Pump

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Its a 12 volt hydraulic pump with a hard-wired remote. I built the dump trailer at home using an old car-hauling trailer frame and bought the pump and reservoir unit from a trailer dealer. It has worked fine for 2 1/2 years though I have had to open the remote and clean the contacts once or twice. Now it will make a clicking/buzzing noise when the remote switch is closed for the lifting operation. The vibration is in the solenoid that is mounted on the motor body. I have cleaned all the electrical connections at the battery, switch, solennoid, etc., with no effect. I opened the solenoid last night to discover that it would be tricky to alter anything inside the body without damaging something. The dealer suggested that the solenoid might need to be replaced, or the valves may be dirty and stuck. Haven't opened the valves yet. Can you help me isolate the problem? Thanks, Chuck G

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Generic comments follow:

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