Komatsu D31EX-21, Operation & Maintenance Manual, Page: 209 / 256

MAINTENANCE
SERVICE PROCEDURE
4-29
CHECK IDLER OIL LEVEL, ADD OIL 4
WARNING
If the oil level in the idler is low, new oil must be added, and the machine body must be inclined in this
case. Since this work is dangerous, ask your Komatsu distributor.
If the oil level in the idler is low, noise will be generated and there will be seizure, so check the oil level and add oil
as follows.
INSPECTION
1. Remove bolt (1), then remove guide plate (2) and shim (3).
REMARK
When removing shim (3) keep it in a safe place and be careful
not to lose it.
2. Loosen plug (4) slowly. If oil oozes through the threads at
this time, the quantity of oil is sufficient. Tighten plug (4).
3. If any oil does not flow out when plug (4) is removed, the
quantity of oil is insufficient. In this case, ask your Komatsu
distributor for repair.
4. Install guide plate (2) and shim (3) with bolt (1).
REMARK
When installing guide plate (2), install the same number and
thickness of shim (3) as removed in Step 1.
The optimum clearance may be obtained, if the adjustment is
made at the same time. For details of adjusting the shim thick-
ness, see “ADJUST IDLER CLEARANCE (4-29)“.
ADJUST IDLER CLEARANCE 4
Since the idlers are forced to move forward and backward by an external force guide plates will be worn out.
Wear of these plates will cause the vibration of idlers from side to side or inclination of the idlers, and running off of
track links from the idlers or unevenly worn idler and links may result.
Therefore, adjust the idlers according to the following procedure.