Method For Checking Function Of Ppc Accumulator; Method For Checking Alternator; Method For Checking And Adjusting Engine Valve Clearance - Komatsu WA200-8 Operation & Maintenance Manual

MAINTENANCE
2.
With the brake pedal depressed, insert the inspection
gauge (2) to the protrusions of the piston (3) and plate (4).
If the inspection gauge (2) can be inserted to the protru-
sions, the disc wear has reached to the repair limit.
In such case, ask your Komatsu distributor to perform the
inspection and replacement of the part.
REMARK
Perform the operation with 2 workers. One worker depres-
ses the brake pedal and the other pushes in the inspection
gauge (2).
3.
Install the inspection plug (1).
Tightening torque : 127 to 177 Nm {13 to 18 kgm}

METHOD FOR CHECKING FUNCTION OF PPC ACCUMULATOR

For handling of the accumulator, see "HANDLE ACCUMULATOR AND GAS SPRING".
When you cannot restart the stopped engine while the work equipment is raised, you can use, as urgent meas-
ures, the oil pressure stored in the accumulator to actuate the valve, thereby, lower the work equipment to the
ground.
1.
Apply the parking brake.
2.
Raise the work equipment to the upper end and operate
the multifunction mono-lever to "HOLD" position (b).
3.
Stop the engine.
4.
Turn the starting switch to ON position.
5.
Press the work equipment lock switch and unlock the work
equipment (the pilot lamp goes out).
6.
After checking safety around the machine, operate the
multifunction mono-lever to "FLOAT" position (d) and lower
the work equipment to a position 1 m from the ground.
7.
After the work equipment is lowered to a position 1 m from
the ground, return the multifunction mono-lever to "LOW-
ER" position and lower the work equipment gradually to
the ground.
REMARK
The check must be done within 2 minutes after the engine
stops. If the engine is kept stopped, the gas pressure in
the accumulator lowers and the inspection cannot be
made.
If the work equipment stops halfway, the accumulator gas pressure may be low.
Ask your Komatsu distributor for inspection.
Replace the accumulator for every 4000 hours or every 2 years.

METHOD FOR CHECKING ALTERNATOR

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

METHOD FOR CHECKING AND ADJUSTING ENGINE VALVE CLEARANCE

Special tools are necessary for inspection and maintenance. Ask your Komatsu distributor to perform this work.
MAINTENANCE PROCEDURE
4-75