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MAINTENANCE
SERVICE PROCEDURE
CHECKING CHARGE PRESSURE OF NITROGEN GAS IN ACCUMULATOR (FOR CONTROL CIRCUIT)
WARNING
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an explosion, which will lead to
serious injury or damage. When handling the accumulator, always do as follows.
The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic equipment, do not stand
in the direction that the oil spurts out when carrying out the operation. In addition, loosen the bolts slowly when carrying out
the operation.
Do not disassemble the accumulator.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it or weld it.
Do not hit it, roll it, or subject it to any impact.
When disposing of the accumulator, the gas must be released. Please contact your Komatsu distributor to have this work
carried out.
FUNCTION OF ACCUMULATOR
The accumulator stores the pressure in the control circuit. Even
after the engine is stopped, the control circuit can be operated, so
the following actions are possible.
If the control lever is operated in the direction to lower the work
equipment, it is possible for the work equipment to go down
under its own weight.
The pressure in the hydraulic circuit can be released.
The accumulator is installed to the position shown in the diagram
on the right.
CHECKING FUNCTION OF ACCUMULATOR
Replace the accumulator every 2 years or every 4000 hours, whichever comes sooner.
Check the nitrogen gas charge pressure as follows.
1.
Stop the machine on firm, level ground.
2.
Set the parking brake lever to the LOCK position.
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