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MAINTENANCE
For details, see"METHOD FOR INSTALLING HYDRAULIC TANK OIL FILLER CAP (3-148)".
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 pressure of the control circuit in it. Even if the engine is stopped, the
control circuit can be operated as long as the accumulator functions normally, so the following actions are possi-
ble.
•
When the control lever is operated in the direction to lower the equipment, the work equipment goes under
its own weight.
•
Release the pressure from the hydraulic circuit.
The accumulator is installed to the position shown in the figure.
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.
2.
Hold the work equipment in the maximum reach posture
(arm fully OUT, bucket fully DUMP) at height (A) 1.5 m
from the ground.
3.
Perform the following procedure within 15 seconds.
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WARNING
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CAUTION
MAINTENANCE PROCEDURE
4-67
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