MTGreen
Platinum Member
- Joined
- Oct 12, 2022
- Messages
- 987
- Location
- Montana, USA
- Tractor
- Deere 5220, Ford 1720, Deere Progator 2030
Every high pressure hydraulic circuit has a relief valve for over pressure built in and you may have more than one. If you trace the circuit from the tank to the pump to the valve to your hydraulic motor/cylinder and back to your tank, there will be a relief valve somewhere in the circuit that opens when the pressure gets too high to short circuit the fluid back to the tank and relieve the pressure. If that valve is stuck open it will be continuously short circuiting and you'll never get anywhere close to working pressure at your motor/cylinder regardless of what your pressure pump is putting out.Which relief valve, I do not know how to identify a/the relief valve
There's definitely one in the circuit and you may have an additional one on your valve as well
The surest way to rule this out is to measure the pressure at your actuator (in your case hydraulic motor) when your valve is open. If you have full system pressure here you do not have a relief valve problem and you either have a bad hydraulic motor or a blockage somewhere in the motor output to the tank or incorrect plumbing. If you don't then it could be a number of things like blockages on the input side or incorrect plumbing or relief valve stuck open.
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