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If its a cartridge valve pull out of the manifold and look at the nose of the cartridge. If there is a screen then see if its clean and try blowing compressed air on, in, and around it. If there is no screen then try pushing on the nose of the cartridge with a small screw driver (be careful not to damage anything). There may be only spring pressure holding it down. Actuate multiple times blowing compressed air into it to try cleaning any debris out. This will work if its a check valve, solenoid cartridge valve, flow control, or dump valve. To do on a relief valve you may have to back the control all the way out and reset the setting afterwards (this may be difficult if you do not understand hydraulic systems). |
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Lathe |
Horizontal or Vertical machine center |
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Type: Variable displacement pump Check compensator pressure setting. Some pumps have both a flow setting and a pressure adjustment valve. If there is only one it should be pressure setting. There will also be a separate manifold with the relief valve that should be set a minimum 200PSI higher. Check relief valve cartridge is not stuck open. Remove the cartridge and look for dirt in the nose of valve. Type:Variable speed motor that controls pump flow. Pumps may have a transducer that is faulty. Also could be settings were messed with on digital display. Check relief valve cartridge is not stuck open. Remove the cartridge and look for dirt in the nose of valve. Type:Fixed displacement pump with dump valve Check the relief setting. The relief can be adjusted when dump valve is energized only. Check relief and dump valve cartridge are not stuck open. Remove the cartridges and look for dirt in the nose of valve. |
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