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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 PPC CIRCUIT ACCUMULATOR
This accumulator (for PPC circuit) is installed to the solenoid
valve. Even if the engine is stopped while the work equipment
is raised, pilot oil pressure can be supplied to the work equip-
ment control valve with the pressure of the compressed nitro-
gen gas in the accumulator to operate the spool and lower the
work equipment by its own weight.
METHOD FOR CHECKING ACCUMULATOR FUNCTION
When performing the inspection, check first that there is no person or obstacle in the surrounding area.
Check the nitrogen gas charge pressure as follows.
1.
Place the machine on a flat ground.
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WARNING
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CAUTION
MAINTENANCE PROCEDURE
4-71
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