Check Engine Valve Clearance, Adjust; Checking Charge Pressure Of Nitrogen Gas In Accumulator (For Control Circuit) - Komatsu D475A-5E0 Operation & Maintenance Manual

SERVICE PROCEDURE

CHECK ENGINE VALVE CLEARANCE, ADJUST

Special tools are required for removial and adjustment of the parts, ask your Komatsu distributor to perform this
service.

CHECKING CHARGE PRESSURE OF NITROGEN GAS IN ACCUMULATOR (FOR CONTROL CIRCUIT)

The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an explosion, which will lead to
serious injury or death. When handling the accumulator, always observe as 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
operation.
Do not disassemble the accumulator.
Do not bring it near open flame or dispose of it in fire.
Do not make holes in it or weld it or gas cut it.
Do not hit it, roll it, or subject it to any impact.
When disposing of the accumulator, the gas must be released. Ask your Komatsu distributor to have this work performed.
NOTICE
If the nitrogen gas charge pressure in the accumulator is low and operations are continued, it will become impossible to release
the remaining pressure inside the hydraulic circuit if a failure occurs on the machine.
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.
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.
The pressure in the hydraulic circuit can be released.
The accumulator is installed to the position shown in the figure on
the right.
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WARNING
MAINTENANCE