Komatsu D31EX-21, Operation & Maintenance Manual, Page: 210 / 256

SERVICE PROCEDURE
MAINTENANCE
4-30
ADJUSTMENT
1. Move the machine by 1 to 2 m on a level place, then mea-
sure clearance A between the track frame and guide plate
(at four places of both sides, inside, and outside).
2. If the clearance A exceeds 4.0 mm, loosen bolt (1), and
pull out the shim to adjust the clearance at one end to 0.5
to 1.0 mm.
Thickness of one shim is 1.0 mm.
ADJUST PLAY IN CENTER BALL 4
WARNING
Always lock the blade control lever securely with the safety lock lever except when operating the blade
during the adjustment operation.
When the blade assembly has been removed for transportation, the play of the center ball must be adjusted when
assembling it again. If this is not done, soil will enter and cause premature wear or damage of the ball and vibra-
tion of the work equipment, so adjust as follows.
1. Remove bolt (1) and cap (2), then remove shim (3).
2. With shim (3) removed, install cap (2) and tighten with bolt
(1).
3. Measure clearance A, then add 0.2 to 1.2 mm to calculate
the shim thickness. Assemble this shim thickness.
Shim thickness: 1 mm x 2
2 mm x 3
GREASE DOOR HINGE 4
(Machines equipped with cab)
If the door makes a squeaking noise when it is opened or
closed, spray lubricant in through the split in the hinge bushing.
If the bushing is worn, replace the hinge.
Guide plate
Track frame
Clearance A
Slit