Adjustment Of The Ppc Valve Clearances - Komatsu PC20R-8 Shop Manual

TESTING AND ADJUSTMENTS

ADJUSTMENT OF THE PPC VALVE CLEARANCES

The clearance of the PPC valve (hand and foot) levers is
adjusted as follows.
Lower the working equipment to the ground and stop
the engine.
Turn the ignition key to the «I» position and move the
command levers in all directions in order to release
all pressure in the hydraulic circuits.
Return the ignition key to the «O» (OFF) position and
remove it.
Push the lever of the safety device into the
«LOCKED» position.
Slowly loosen the oil-tank refuelling cap to eliminate
residual pressure.
1 - Remove cap (1).
2 - Loosen the nut (2) that retains the disc (3).
3 - Tighten the disc (3) until it makes light contact with
the 4 push-rods (4).
H During this adjustment, take care not to acti-
vate any of the push-rods (4) individually.
4 - Secure this position by tightening the retaining nut
(2) to the specific torque.
Retaining nut: 113w15 Nm
20-36
ADJUSTMENT OF THE PPC VALVE CLEARANCES
1
2
3
4
RKP06380
PC20R-8 PC27R-8