Adjusting Play Of Work Equipment And Swing Ppc Valves - Komatsu PC130-7 Shop Manual

TESTING AND ADJUSTING
4. Run the engine at high idling and measure the oil
pressure while the control lever or pedal of the
measured circuit is in neutral and while it is oper-
ated to the stroke end.
a If the PPC valve output pressure is as fol-
lows, the solenoid valve is normal.
Lever/Pedal
In neutral
Almost same as control basic
Operated to
pressure (See standard values
stroke end
table)
5. After finishing measurement, remove the mea-
suring instruments and return the removed parts.
20-136
(1)
MEASURING SOLENOID VALVE OUTPUT PRESSURE,

ADJUSTING PLAY OF WORK EQUIPMENT AND SWING PPC VALVES

Output pressure
2
0 MPa {0kg/cm }
ADJUSTING PLAY OF WORK
EQUIPMENT AND SWING PPC
VALVES
a If the work equipment and swing levers have
large play, adjust them according to the following
procedure.
1. Remove the work equipment and swing PPC
valve assembly.
2. Remove bellows (1).
3. Loosen locknut (2) and tighten disc (3) until it
touches the heads of 4 pistons (4).
a Do not move the piston at this time.
4. Fix disc (3) and tighten locknut (2) to the speci-
fied torque.
3 Locknut: 69 – 88 Nm {7 – 9 kgm}
5. Install bellows (1).
6. Install the work equipment and swing PPC valve
assembly.
PC130-7