Method For Inverting And Replacing Cutting Edge And End Bit - Komatsu D61EX-24 Operation & Maintenance Manual

MAINTENANCE PROCEDURE

METHOD FOR INVERTING AND REPLACING CUTTING EDGE AND END BIT

It is dangerous if the work equipment moves by mistake when the cutting edge and end bit are turned
180 deg. or replaced.
Set the work equipment in a stable condition, place the work equipment lock lever in LOCK position,
then stop the engine.
Turn the cutting edges and end bits 180 degrees or replace them before they are worn out to the blade end.
1.
Raise the blade to proper height, and place blocks under it to prevent it from lowering.
2.
Set the work equipment lock lever to LOCK position.
3.
Stop the engine.
4.
Judge the wear of the end bit and cutting edge by the following wear standards.
Wear standards
Item
No. Measuring point
a Height of end bit
b Width of end bit
Height of cutting edge
c
(Center of bolt mounting hole
to edge)
REMARK
• If both sides of the cutting edge are worn out, replace with new ones.
• If the wear extends to the mounting surface, repair the mounting surface before installing the cutting
edge.
5.
Loosen nut (1) and remove bolt (2).
6.
Remove the cutting edge and end bit.
7.
Clean the mounting face.
8.
Turn the cutting edge and end bit 180 degrees or replace
them with new ones.
9.
Install the cutting edge and end bit, and tighten them light-
ly.
If nut (1) and bolt (2) are damaged, replace them as well.
10. Press the blade against the ground to eliminate of the play
of bolt (2).
11. Tighten the bolt to the specified torque.
Tightening torque of mounting nut : 392 to 530 Nm {40 to 54 kgm, 289 to 391 lbft}
12. After operating the machine for several hours, retighten the mounting nuts.
4-28
k k
WARNING
Criteria ( mm { in} )
Standard
Repair limit
dimension
204 {8} 187 {7.4}
325 {12.8} 300 {11.8}
102 {4} 85 {3.3}
MAINTENANCE