NOTE: The laptop computer with the excavator diagnostic
software can be used to make a quick check of
the pilot system pressure using the arm in
function. Connect the computer and select "5 Arm
roll-in pilot pressure" from monitor data menu.
Run engine at fast idle and then actuate arm in
function over relief. The pressure reading
displayed is from the arm in pressure sensor
located in the flow regulator valve.
Before making any adjustments, check the pilot
pressure at the pilot pump using a pressure
1. Stop the engine.
2. Loosen vent plug (K) to release the air pressure in
hydraulic oil tank.
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