Komatsu PC80MR-5E0, Operation & Maintenance Manual

Page: 335 / 412

METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRES-
SURE IN ACCUMULATOR (FOR CONTROL CIRCUIT)
k k
WARNING
The accumulator is charged with high-pressure nitrogen gas. Observe the following for handling it, oth-
erwise improper operation may cause an explosion which will lead to serious injury or death.
• 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.
Loosen the screws 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 perform this work.
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.
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.
• The work equipment is lowered under its own weight when moving the control lever in the direction to lower
the work equipment.
• The pressure in the hydraulic circuit can be released.
REMARK
This function can be used when the starting switch is in ON position and the lock lever is in FREE position.
The accumulator is installed to the position shown in the figure.
METHOD FOR CHECKING FUNCTION OF ACCUMULATOR
k k
CAUTION
Be sure that no person or obstacle is around the machine before performing the inspection.
1.
Start the engine.
RKA69160
MAINTENANCE MAINTENANCE PROCEDURE
4-69
WENAM00241