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Soni, I will PM you my number, this system does have a variable output from what I can tell. What you are describing sounds close to the symptom. When I activate the circuit the cylinder moves slightly but doesn't have enough pressure to fully function. I can also hear the second stage start to...

Thanks for all the input and suggestions this far.

Also for what its worth, this wrecker has a 2 or 3 stage pump on it. So when you activate a circuit it starts slow and then 'speeds up'. When I pull the control I hear the typical noise change in the hydraulic circuit, but then it sound like it almost releases or stops working. This is hard to...

Is this a serviceable problem? Is there something I can check/troubleshoot? Thanks for the help.

I am having an unusual problem with the Grove crane on the FMTV wrecker. When I first go to use the crane, naturally I activate the PTO switch on dash, system fires up and all is good. However for some reason the crane 'lift' operation and the boom lift operation will sometimes not work. So...