Komatsu Galeo PC800-8 Shop Manual page 354

SEN00788-02
4. Measuring travel circuit oil pressure
1) Start the engine and lock the travel mecha-
nism.
k Put pin [2] between the sprocket and
track frame to lock the travel mecha-
nism securely.
2) Run the engine at high idle, relieve the
travel motor, and measure the oil pressure.
a The main relief valves of the right and left
control valves relieve on the high-pressure
setting side.
6
Adjusting
a Do not adjust any safety valve other than the
swing motor safety valve.
a When adjusting the main relief valves of the left
5-spool valve and right 4-spool valve, remove
the control valve top cover.
1. Adjusting main relief valve (high-pressure
setting) of left 5-spool control valve
a If the work equipment oil pressure in the front
pump circuit (during heavy lift operation) and
the left travel oil pressure are abnormal, ad-
just the high-pressure setting side of main
relief valve (5) of the left 5-spool control
valve according to the following procedure.
a The high pressure setting is the state in
which the 2-stage relief solenoid valve is
turned ON and the pilot pressure is applied
to the changeover port.
1) Disconnect hose (6).
2) Loosen locknut (7) and set elbow (8) free.
3) Fix holder (9) and loosen locknut (10).
4) Turn holder (9) to adjust the pressure.
a If the holder is
• turned to the right, the pressure rises.
• turned to the left, the pressure lowers.
a Pressure changed by 1 turn of holder:
30 Testing and adjusting
21.8 MPa {209 kg/cm }
2
PC800, 850-8