I took it to a hydraulic shop and they tested the pump and that is fine but the max pressure on the out-side of the relief valve was 700psi. They said adjusting the relief did nothing. They found a relief valve for 50 bucks but want a couple hundred bucks to install, so I will install it and see what happens. I'll post the final outcome.
Backhoe Jinma 354 backhoe hydraulic problem
RonMar
Elite Member
When installing the new relief valve, how do you plan on disabling the existing relief valve? Since it is inside the control valve with a path leaking from high pressure to low pressure, it will continue to limit the system pressure to 700PSI as it appears to be doing now. I am not exactly sure of a way to disable a safety relief buried inside a control valve, short of a precision machined plug... Since the relief adjustment changes the spring tension applied to a valve, I would say there is something keeping that tension from increasing the sealing pressure on that valve assembly. Perhaps a stuck valve plunger...
Perhaps one of the dealers here would be willing to take a look at your valve and compare your parts to a known good one and look for a flaw in your system.
Perhaps one of the dealers here would be willing to take a look at your valve and compare your parts to a known good one and look for a flaw in your system.
erj
Gold Member
Bill,
Send me a PM with your Email address and I'll send you a PDF file for rebuilding the Pressure Relief Valve. Sounds like it would be worthwhile now that you Know that you are getting low pressure.
RonJ
Send me a PM with your Email address and I'll send you a PDF file for rebuilding the Pressure Relief Valve. Sounds like it would be worthwhile now that you Know that you are getting low pressure.
RonJ