Komatsu WA20-2, Operation & Maintenance Manual

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24.2.10 REPLACE BOLT-ON CUTTING EDGE
(option for WA20)

WARNING
It is extremely dangerous if the work equipment moves when
carrying out the turning or replacement operation.
Set the work equipment in a stable position, stop the engine,
then set the safety lock for the work equipment control lever
securely to the LOCK position.
Turn or replace the cutting edge before the wear reaches the
edge of the bucket.
1. Raise the bucket to a suitable height, then put blocks under the
bucket to prevent the bucket from coming down.
Raise the bucket so that the bottom surface of the bucket is
horizontal.
2. Remove nuts 2 and bolts 1 , then remove cutting edge 3 .
3. Clean the mounting surface of cutting edge 3 .
4. Turn cutting edge 3 and install it to the bucket. When turning
the edge, install it to the opposite side (left edge to right side,
right edge to left side).
If both sides of the cutting edge are worn, replace with a new
part.
If the wear extends to the mounting surface, repair the mounting
surface before installing the cutting edge.
If bolt 1 or nut 2 are damaged, replace them at the same time.
5. Tighten nuts 2 and bolts 1 uniformly so that there is no gap
between the bucket and cutting edge.
Tightening torque for mounting bolt: 265 ± 29 N•m
(27 ± 3 kgf•m, 54 ± 6 lbft)
6. Tighten the mounting bolts again after operating for several
hours.
24. SERVICE PROCEDURE 24. SERVICE PROCEDURE