PC58UU-3
20-121
b
TESTING AND ADJUSTING ADJUSTING PPC VALVE
ADJUSTING PPC VALVE
★
If the work equipment control lever or swing
lever has excessive play, adjust it according to
the following procedure.
1. Remove the PPC valve.
2. Remove boot (1).
3. Loosen locknut (2) and tighten disc (3) until it
comes in contact with the heads of 4 pistons
(4).
★
Do not move the pistons at this time.
4. Fix disc (3) and tighten locknut (2) to the speci-
fied torque.
5. Install boot (1).
★
The clearance between disc (3) and piston
(4) is eliminated by the above adjustment.
TESTING SWING HOLDING
BRAKE INLET PRESSURE
1. Disconnect hose (1).
2. Install nipple C4 (including O-ring and plug) and
C3 (including the O-ring), then install oil pres-
sure gauge C1 (5.9 MPa {60 kg/cm²}.
3. Run the engine at full throttle and perform the
[LEFT swing] and [RIGHT swing] operations and
measure the inlet pressure.
★
The standard values are the same as those
in the control circuit (when the control lever
is moved to the stroke end).
Lower the work equipment to the
ground and stop the engine. Then,
loosen the oil filler cap slowly to
release the internal pressure of
the hydraulic tank. Set the safety
lock lever to the LOCK position.
Locknut:
107.9 ± 9.8 Nm {11 ± 1
kgm}
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