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MAINTENANCE
METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRES-
SURE IN ACCUMULATOR (FOR CONTROL CIRCUIT)
The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an ex-
plosion, which will lead to serious injury or death. For handling, always observe the following.
•
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 performing the operation. In
addition, loosen the bolts slowly when performing the work.
•
Do not disassemble it.
•
Do not bring open flame close to it or do not dispose of it in fire.
•
Do not perform drilling, welding or flame-cutting.
•
Do not hit or roll it, or subject it to any impact.
•
When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.
NOTICE
If the nitrogen gas charge pressure in the accumulator is low and operations are continued, it becomes
impossible to release the remaining pressure inside the hydraulic circuit if a failure occurs on the ma-
chine.
FUNCTION OF ACCUMULATOR
The accumulator has function of storing the pressure of the control circuit in it. 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 equip-
ment 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 figure.
METHOD FOR CHECKING FUNCTION OF ACCUMULATOR
When performing the inspection, check first that there is no person or obstacle in the area around the
machine.
Replace the accumulator every 2 years or every 4000 hours, whichever comes sooner.
Check the nitrogen gas charge pressure as follows.
1.
Place the machine on a flat ground.
WARNING
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CAUTION
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WENAM00111
MAINTENANCE PROCEDURE
4-65
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