Komatsu D31EX-21, Operation & Maintenance Manual, Page: 153 / 256

OPERATION
OPERATION
3-101
q
Check clearance (B) between the idler guide plate and
track frame. If clearance (B) increases, idler may move
sideways and the tracks may come off. (For inspection and
adjustment procedure, refer to “ADJUST IDLER CLEAR-
ANCE (4-29)“.)
INSPECTION AND REPAIR 3
Frequent inspection and prompt repair will reduce repair costs.
The following items for inspection will serve as a guide to maintenance service of each undercarriage part. Per-
form periodical inspection and contact the Komatsu distributor in your area when machine has approached repair-
able limits and reversing limits.
MEASURING LINK PITCH
1. Insert a wooden block between track shoe and sprocket to
take up the slack in track shoes.
2. Measure pitch length of 4 links in stretched portion at more
than 2 links away from master pin. Of length obtained, 1/4
is the link pitch.
There is no link window on the master link.
D31,37
q
Basic link pitch (P): 154.3 mm
q
Link pitch limit for turning: 157 mm
D39
q
Basic link pitch (P): 171.5 mm
q
Link pitch limit for turning: 174.5 mm
REMARK
The measured value under decimal of Link pitch is different from the basic value depending upon the precision of
measure or the tolerance of product even if it isn't worn out.
Don't judge it's worn out too soon, do it with the trend of measured value after that.
Track frame
Guide plate
Clearance B
Master link