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MAINTENANCE
FUNCTION OF ACCUMULATOR
The accumulator stores the pressure in the control circuit.
Even after the engine is stopped, the control circuit can be
operated, so the following actions are possible.
q
If the control lever is operated in the direction to lower the
work equipment, it is possible for the work equipment to go
down under its own weight.
q
The pressure in the hydraulic circuit can be released.
The accumulator is installed to the position shown in the dia-
gram on the right.
CHECKING FUNCTION OF ACCUMULATOR
When carrying out the inspection, check first that there is no person or obstacle in the surrounding area.
Check the nitrogen gas charge pressure as follows.
1. Stop the machine on firm, level ground.
2. Hold the work equipment in the maximum reach posture
(arm fully out, bucket fully dumped) at a height (A) 1.5 m
from the ground.
Carry out Steps 3 - 5 within 15 seconds.
When the engine is stopped, the pressure in the accumulator gradually goes down. For this reason, the check
can only be carried out immediately after the engine is stopped.
3. Keep the work equipment at the maximum reach, turn the
starting switch to the OFF position (A), and stop the
engine.
CAUTION
MAINTENANCE PROCEDURE
4
4
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