Komatsu PC350LC-8, Operation & Maintenance Manual

Page: 183 / 502

OPERATION
DETAILED CONTROLS AND GAUGES
3-119
HANDLING THE ACCUMULATOR 3
WARNING
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an explo-
sion which will lead to serious injury or damage. When handling the accumulator, always do as follows.
q
The pressure in the control circuit cannot be completely removed. When removing the hydraulic
equipment, do not stand in a position where the oil spurting out can strike you. Loosen the bolts
slowly.
q
Do not disassemble the accumulator.
q
Do not bring it near flame or dispose of it in fire.
q
Do not make holes in it or weld it.
q
Do not hit it, roll it, or subject it to any impact.
q
When disposing of the accumulator, the gas must be released. Please contact your Komatsu distribu-
tor to have this work carried out.
The machine is equipped with an accumulator in the control cir-
cuit. The accumulator in the control circuit is a device to store
pressure. When this accumulator is installed, it is possible to
operate the control circuit for a short time even after the
engine is stopped. Therefore, it is possible to lower the work
equipment under its own weight by operating the control lever
in the direction to lower the work equipment.
The accumulator is installed in the position shown in the dia-
gram on the right.
RELEASING PRESSURE IN CONTROL CIRCUIT ON MACHINE EQUIPPED WITH ACCU-
MULATOR
3
1. Lower the work equipment to the ground, then close the crusher or other attachment.
2. Stop the engine.
3. Turn the key in the starting switch to the ON position again to let electric current flow in the circuits.
4. Set the safety lock lever to the FREE position, then operate the work equipment control levers and attach-
ment control pedal (if equipped) backwards and forwards, and to the right and left to the full stroke to release
the pressure in the control circuit.
5. Set the safety lock lever to the LOCK position to lock the control levers and attachment control pedal. Note
that the pressure is not completely removed, so when removing accumulator (1) in the control circuit and
accumulator (2) in the valve return circuit, loosen the bolts slowly and do not stand where the oil can strike
you if it spurts out.