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MAINTENANCE PROCEDURE
3.
Remove the cover (1), pull up the top of the rod (3), take
out the spring (2) and strainer (4).
4.
Remove any dirt stuck to the strainer (4), then wash it in
flushing oil. If the strainer (4) is damaged, replace it with a
new one.
5.
When installing, insert the strainer (4) and set it in project-
ed portion (5) of the tank.
6.
Install the cover (1) so that the protruding part at the bot-
tom of cover (1) holds the spring (2), then fasten the cover
with the bolts.
7.
Install the cap of oil filler port.
For details, see "METHOD FOR INSTALLING HYDRAUL-
IC TANK OIL FILLER CAP".
8.
Install the step.
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 a function to store the pressure of the control circuit in it. Even after the engine is stopped,
the control circuit can be operated as long as the accumulator functions normally, so the following actions are
possible.
•
When the control lever is operated in the direction to lower the work equipment, the work equipment goes
down under its own weight.
•
Release the pressure from the hydraulic circuit.
4-64
k
k
WARNING
MAINTENANCE
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