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MAINTENANCE
2.
Push in rod (2) fully while depressing the brake pedal.
The amount of the protrusion of rod end face (C) from
guide end face (D) corresponds to wear amount (A).
Measure the protrusion.
Allowable disc wear limit (B) corresponds to the distance
between groove (E) and end face (D) of the guide.
In such case, ask your Komatsu distributor to perform in-
spection and replacement of the part.
If the disc wear approaches the wear limit, check the con-
dition frequently, regardless of the maintenance interval.
3.
Install cap nut (1).
Tightening torque: 29.4 to 39.2 Nm {3.0 to 4.0 kgm}
REMARK
•
On a new machine, the position of the end face of rod (2) is adjusted so that it matches the end face of
guide (3). Therefore, do not loosen lock nut (4) except when replacing the disc.
•
Perform the operation with 2 workers. One worker depresses the brake pedal and the other pushes in
the rod.
METHOD FOR CHECKING FUNCTION OF PPC ACCUMULATOR
For handling of the accumulator, see "HANDLE ACCUMULATOR AND GAS SPRING (2-40)".
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.
MAINTENANCE PROCEDURE
4-73
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