Method For Replacing Accumulator (For Control Circuit); Method For Checking For Looseness Of Engine High-Pressure Piping Clamp, Hard- Ening Of Rubber - Komatsu D37EX-24 Operation & Maintenance Manual

MAINTENANCE

METHOD FOR REPLACING ACCUMULATOR (FOR CONTROL CIRCUIT)

The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an ex-
plosion, which will lead to serious injury or death, or damage. For handling, always observe the follow-
ing.
• 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 work.
• Do not disassemble.
• Do not bring open flame close to it or do not dispose of it in fire.
• Do not perform drilling, welding or flame-cutting.
• Do not hit or roll it, or subject it to any impact.
• When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.
NOTICE
If the nitrogen gas charge pressure in accumulator (1) 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.
Ask your Komatsu distributor to replace it.
Replace the accumulator every 2 years or every 4000 hours,
whichever comes sooner.
METHOD FOR CHECKING FOR LOOSENESS OF ENGINE HIGH-PRESSURE PIP-
ING CLAMP, HARDENING OF RUBBER
NOTICE
If the engine operation is continued while any bolt is loosened or any rubber is hardened or removed,
the contact portions of the high-pressure piping may be worn and may be broken by vibration. Always
check that the proper high-pressure piping clamps are correctly installed.
Check visually or with a finger to check that there is no hardening of the rubber portion and no loose bolts of the
mounting clamps (2 places) for the high-pressure piping between the supply pump and the common rail.
• If there is any loose bolt or hardened rubber portion, ask your Komatsu distributor for replacement.
• Replacement of the high-pressure piping must be made as an assembly.
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WARNING
MAINTENANCE PROCEDURE
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