Komatsu PC1250-11 Original Instructions Manual page 385

MAINTENANCE
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.
The accumulator is installed to the position shown in the figure.
METHOD FOR CHECKING ACCUMULATOR FUNCTION
Be sure that no person or obstacle is around the machine before performing the inspection.
Check the nitrogen gas charge pressure as follows.
1.
Place the machine on a firm, level ground.
2.
Hold the work equipment in the maximum reach posture
(arm fully out, bucket fully dumped) at height 1.5 m from
the ground.
3.
Perform the following procedure within 15 seconds.
After the engine stops, the accumulator pressure decreases gradually. You can check only just after the en-
gine stops.
1)
Keep the work equipment at the maximum reach pos-
ture, turn the starting switch to OFF position (A), and
stop the engine.
k k
CAUTION
MAINTENANCE PROCEDURE
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