XR842/1045 Pressure Adjustments

Main Pump Standby Pressure Max Pressure

Distribution Block “GP1” Main Pressure PSI “GAL” Rear Axle Anti-Cavitation 50 PSI “GLS” Load-Sense PSI “GPB” Parking Brake 400 PSI

Hawe Main Valve System Relief “Safety” Valve 4500 PSI

Standby Pressure Adjustment “GP1” Main Pressure PSI  Install PSI pressure guage on GP1  Loosen jam nut on standby pressure adjustment valve  Turn on machine and adjust standby pressue to 500 PSI.  Lock down adjustment and verify pressure is still at 500 PSI  Turn off machine and remove pressure gauge Standby Pressure Adjustment

Max Pressure Adjustment “GP1” Main Pressure PSI  Install PSI pressure gauge on GP1  Loosen jam nut on standby pressure adjustment valve  Turn on machine and deadhead boom retract and adjust max system pressure to 3500 PSI.  Lock down adjustment and verify pressure is still at 3500 PSI while retract is deadheaded  Turn off machine and remove pressure gauge Max Pressure Adjustment

Max Relief Pressure Adjustment “GP1” Main Pressure PSI  To adjust main relief pressure remove arm rest/main valve cover plate  Remove Acorn/Cap nut of the main relief valve  Loosen jam nut and turn adjustment screw all the way in.  Hook up a 5000 PSI gauge to GP1  Start the engine and adjust main pressure to 4500 Psi while deadheading boom retract.  Slowly back out the main relief adjustment till you start to see a pressure drop or hear the bypass while deadheading boom retract  Once this obtained turn main relief adjustment screw in till bypass sound is stopped.  Tighten Jam nut, reinstall acorn/cup nut, and install arm rest cover.  Back the max pump pressure to 3500 psi as per the max pump pressure adjustment procedure. Max Pressure Adjustment Main Relief Adjustment 4500 PSI