Komatsu PC350LC-8, Operation & Maintenance Manual

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HIGH REACH DEMOLITION MANUAL
INSTALLATION AND REMOVAL
7-43
PROCEDURE FOR PURGING AIR FROM BOOM LOCK VALVE PPC CIRCUIT
WARNING
While monitoring oil temperature, loosen the cap of the hydraulic oil tank to release residual pressure
(purge air) in the tank.
1. PRECAUTIONS FOR PURGING AIR FROM BOOM LOCK VALVE PPC CIRCUIT.
1. To mount the demolition high reach boom and arm, purge air
from the boom lock valve PPC circuit before operating the cyl-
inder.
2. To assemble the demolition high reach work equipment,
purge air from the boom lock valve PPC circuit before the cyl-
inder rod side work equipment is mounted.
3. To remove the PPC circuit hoses, stop the engine and oper-
ate the control levers and pedals to release residual pressure
in the circuit.
4. For safety, during air purging, close the stop valve in the work
equipment piping.
5. For pipe fittings, refer to the parts list for the high reach boom.
2. AIR PURGING OF BOOM CYLINDER LOCK VALVE
1. Air purging of pilot hose.
WARNING
To prevent accidental operation of the boom cylinder, dis-
connect the pilot hose of the control valve at the tee joint
(DOWN side) and adapter (UP side) (position i on diagram -
close to swivel joint).
q
Place a blank cap or blind plug on the removed hose connec-
tors, tee joints and adapters.
Cylinder rod side
Cylinder bottom
bracket side
Boom lock valve
.
(1)
(2)
(3)
(4)
(1) #03 (M18, P=1.5) elbow with O ring for pilot P
(2) R=1/8" hex socket head plug for valve inner drain
(3) #03 (M18, P=1.5) R=1/4" threaded elbow for pilot T
(4)
Plate can be mounted on either left or right side