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MAINTENANCE
SERVICE PROCEDURE
CHECK BRAKE DISC WEAR
WARNING
When checking the brake disc wear, apply the parking brake and secure the front and rear frames with the frame lock bar.
Make sure that the brake oil temperature is less than 60°C (140°F) before checking the brake wear.
If the disc is near the wear limit, carry out inspection at shorter intervals, regardless of the specified inspection interval.
When checking the brake disc for wear, there are 4 places (front axle and rear axle, left and right), so use the same
procedure to check all 4 places.
1.
Remove cap nut (1).
2.
Depress the brake pedal, keep it depressed, and push in the
rod (2) of the gauge until contacts the piston.
3.
The wear is the amount that the end face of rod (2) is protruding
from the end face of guide (3). Measure the amount of
protrusion.
The point where the rod groove is level with the end face of the
guide is the permissible limit for the disc wear.
If the wear has reached this point, please ask your Komatsu
distributor for inspection and replacement parts.
If the disc is near the wear limit, carry out inspection at
shorter intervals, regardless of the specified inspection
interval.
4.
Install cap nut (1).
Tightening torque: 29.4 to 39.2 Nm (3.0 to 4.0 kgm, 21.7 to
28.9 lbft)
REMARK
On new machines, the position of the guide is adjusted so that the end face of rod (2) comes to the end face of
guide (3). For this reason, do not loosen locknut (4) except when replacing the disc.
Carry out the operation with two workers: one worker depresses the brake pedal and the other worker pushes
in rod (2).
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