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MAINTENANCE
NOTICE
If the nitrogen gas charge pressure in the accumulators 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 accumulators
The accumulator stores the pressure in the circuit of the servo-controls. Even after the engine is stopped, the
control circuit can be operated, so the following actions are possible.
•
By operating the control lever in the lowering direction of the work equipment, this may lower due to its own
weight.
•
The pressure in the hydraulic circuit can be released.
Positioning of accumulators on the machine.
Accumulators operation control method
When performing the inspection, check that there is no person or obstacle in the area around the ma-
chine.
Replace the accumulators every 2 years or every 4000 hours, whichever comes sooner.
Check the nitrogen gas charge pressure as follows.
1.
Stop the machine on a solid and flat surface
2.
Hold the work equipment in the maximum reach posture
(boom fully OUT, bucket fully DUMP) at height (A) of 1.5
mfrom the ground.
3.
Perform the following procedure within 15 seconds.
REMARK
After the engine stops, the pressure of the accumulators
decreases gradually. You can check only just after the en-
gine stops.
k
k
CAUTION
WENAM00130
MAINTENANCE PROCEDURE
RKA65460
4-69
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