Method For Checking Starting Motor; Method For Replacing Accumulator (For Control Circuit); Method For Checking Air Conditioner Compressor Operation - Komatsu PC290LC-11 Operation & Maintenance Manual

MAINTENANCE PROCEDURE

METHOD FOR CHECKING STARTING MOTOR

Ask your Komatsu distributor to have the starting motor checked.
If the engine is started frequently, have this inspection performed every 1000 hours.

METHOD FOR REPLACING ACCUMULATOR (FOR CONTROL CIRCUIT)

The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an ex-
plosion, which will lead to serious injury or death. For handling, always observe the 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 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 the accumulator 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.
Replace the accumulator every 2 years or every 4000 hours, whichever comes sooner. Ask your Komatsu dis-
tributor for replacement.
The accumulator is installed to the position shown in the figure.

METHOD FOR CHECKING AIR CONDITIONER COMPRESSOR OPERATION

Check the following 2 items.
1)
When the air conditioner switch is turned ON-OFF, do the air conditioner compressor and the magnet clutch
also turn ON-OFF?
2)
Is any abnormal noise generated by the magnet clutch or the air conditioner compressor body?
4-74
k k
WARNING
MAINTENANCE