Komatsu D31EX-21, Operation & Maintenance Manual, Page: 112 / 256

EXPLANATION OF COMPONENTS
OPERATION
3-60
ACCUMULATOR, HANDLING 3
(If equipped)
WARNING
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an explo-
sion, which will lead to serious injury or damage. When handling the accumulator, always do as follows.
The pressure in the control circuit cannot be completely removed. When removing the hydraulic equip-
ment, do not stand in the direction that the oil spurts out when carrying out the operation.
Loosen the bolts slowly.
Do not disassemble the accumulator.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it or weld it.
Do not hit it, roll it, or subject it to any impact.
When disposing of the accumulator, the gas must be released. Please contact your Komatsu distributor to
have this work carried out.
The accumulator is a device to store the pressure in the control
circuit, and when it is installed, the control circuit can be oper-
ated for a short time even after the engine is stopped.
Therefore, if the control lever is moved in the direction to lower
the work equipment, it is possible for the work equipment to
move under its own weight.
The accumulator is installed in the position shown in the dia-
gram on the right.
METHOD OF RELEASING PRESSURE IN OPERATING CIRCUIT ON MACHINE EQUIPPED
WITH ACCUMULATOR
3
1. Lower the work equipment and stop the engine.
2. After stopping the engine, operate control lever full strokes
to the front, rear, left, and right to release pressure inside
the work equipment circuit.
However, the pressure cannot be completely released, so
if accumulator in the work equipment circuit is removed,
loosen the screws slowly, and never stand in the direction
oil spurts out.