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clean CS4 check valve with water

when to do this : 1, filling speed is slow , no leaking , pressure can not go pass a high pressure, The pointer swings and the machine works hard 2, when compressor turn off suddently after worked for a while and did not reach desired pressure, or can not start normally, the inner piston maybe blocked STEPS: 1. Install the test plug and set the pressure to 3000psi. 2. Unscrew the grease pot screw. 3. Turn on the machine, tighten the pressure bleed valve, start the machine to pressurize and add water. 4. After the water goes in, the machine reaches about 1500psi. Slowly release the pressure bleed valve, and then let the machine continue to pressurize and deflate at the same time until all the water is discharged .