Adjusting Work Equipment, Swing Ppc Valve - Komatsu Galeo PC800-8 Shop Manual

SEN00912-02
3) Run the engine at high idle, set the condition
or operate the control levers as shown in the
table, and measure the output pressure.
a If the swing priority selector valve outlet
pressure is as shown in the table, the
swing priority selector valve is normal.
• Port A1 (10) (For swing)
Measurement conditions
Swing priority switch: OFF
Neutral
Right work
equipment
Position for
control lever
raising boom
Swing priority switch: ON
Neutral
Right work
equipment
Position for rais-
control lever
ing boom
• Port A2 (11) (For arm Hi and bucket Lo)
Measurement conditions
Neutral
Left work Position for
equipment swinging to left
control lever
Position for
swinging to right
4) After finishing measurement, remove the
measuring instruments and return the
removed parts.
10
Adjusting work equipment,
swing PPC valve
a If there is excessive play at the tip of the work
•
Oil pressure
(MPa {kg/cm 2 })
1. Remove boot (1).
0 {0}
2. Loosen locknut (2), then turn disc (3) to adjust
Same as main
pump pressure
0 {0}
0 {0}
3. Secure disc (3) in position, then tighten locknut
Oil pressure
(MPa {kg/cm 2 })
4. Install boot (1).
0 {0}
Same as main
pump pressure
Same as main
pump pressure
equipment or swing lever, adjust at the PPC
valve end as follows.
Standard lever play (a): 0.5 – 3 mm at point 200
mm from rotating center of lever (forward and re-
verse, and left and right)
the play of the lever.
a While keeping the lever in neutral and turn
disc (3) to a degree that the piston will not be
pushed in.
3 Locknut :
(2) to the specified torque.
98.07 – 127.49 Nm {10 – 13 kgm}
30 Testing and adjusting
PC800, 850-8