Check Brake Disc Wear - Komatsu WA380-6 Operation & Maintenance Manual

MAINTENANCE

CHECK BRAKE DISC WEAR

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 and push in rod (2) fully.
3. Amount of wear (A) is the amount that end face (C) of the rod
protrudes from end face (D) of the guide. Measure the amount
of protrusion.
Permitted wear limit (B) of the disc is the point where groove
(E) of the rod is in line with end face (D) of the guide.
When this point is reached, please ask your Komatsu
distributor to carry out inspection and replacement of 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).
WARNING
SERVICE PROCEDURE
4 - 61