Komatsu D31EX-21, Operation & Maintenance Manual, Page: 208 / 256

SERVICE PROCEDURE
MAINTENANCE
4-28
REVERSE AND REPLACE END BITS AND CUTTING EDGES 4
WARNING
It is dangerous if the work equipment moves by mistake when the cutting edges and end bits are being
reversed or replaced.
Set the work equipment in a stable condition, then stop the engine and lock the blade control lever
securely with the safety lock lever.
Reverse or replace the end bits and cutting edges before it is worn out to the blade end.
1. Raise the blade to a proper height, apply a block under the frame to prevent the blade from falling.
2. Operate the safety lock lever to the LOCK position.
3. Measure the wear of the end bit and cutting edge in accordance with the wear standards given below.
REMARK
If the cutting edge and the end bit on both sides are worn out, replace with new one.
If it has been worn out up to the fitting surface, repair the fitting surface and then reverse or replace.
4. Remove the cutting edge and the end bit and clean the mounting surface.
5. Reverse or replace the cutting edge and the end bit when worn out.
6. Remove nut (1) and bolt (2), then replace or reverse the
cutting edge and the end bit.
7. Install the cutting edge to the blade and tighten the bolt
temporarily. Press the blade against the ground to elimi-
nate the play of bolt (2), then tighten the bolt to the speci-
fied torque.
Tightening torque of mounting nut: 255 ± 34.3 N·m
(26 ± 3.5 kg·m)
If bolt (2) and nut (1) are damaged, replace them with new
ones at the same time.
8. After several hours of running, retourque the nuts.
Item Judgement standard
No. Measurement point
Standard
dimension
(mm)
Repair
limit
(mm)
1 Height of end bit 80 55
2 Height of cutting edge 80 55