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MAINTENANCE
1.
Remove the cap for oil filler (F), and release the internal
pressure.
2.
Remove the bolts (6 pieces), and remove cover (1).
The cover (1) may be jumped out by spring (2). While
pressing down the cover, remove the bolts.
3.
Hold the top of rod (3), pull it up, and remove spring (2)
and strainer (4).
4.
Remove any dirt stuck to strainer (4), then wash it in flush-
ing oil. If strainer (4) is damaged, replace it with a new
one.
5.
Insert and set strainer (4) in projected portion (5) of the
tank.
6.
Install cover (1) so that the protruding part at the bottom of
cover (1) holds spring (2), then fasten the cover with the bolts.
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 equipment control valve with the pressure of
the compressed nitrogen gas in the accumulator to operate the spool and lower the work equipment by its own
weight.
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WARNING
MAINTENANCE PROCEDURE
4-65
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