Komatsu D31EX-21, Operation & Maintenance Manual, Page: 206 / 256

SERVICE PROCEDURE
MAINTENANCE
4-26
WHEN INCREASING TENSION
Prepare a grease gun.
1. Pump in grease through grease fitting (2) with a grease
pump.
2. To check that the correct tension has been achieved, move
the machine backwards and forwards.
3. Check the track tension again, and if the tension is not cor-
rect, adjust it again.
4. It is also possible to pump in grease until dimension S
becomes 20 mm, but if the tension is still loose, there is
excessive wear of the pin and bushing, so it is necessary to
turn or replace the pin and bushing. Please contact your
Komatsu distributor for repairs.
WHEN LOOSENING TENSION
WARNING
It is extremely dangerous to release the grease by any method except the procedure given below. If the
track tension is not relieved by this procedure, please contact your Komatsu distributor.
1. Loosen plug (1) gradually to release the grease.
2. When loosening plug (1), turn it a maximum of one turn.
3. If the grease does not come out smoothly, move the
machine forwards and backwards a short distance.
4. Tighten plug (1).
5. To check that the correct tension has been achieved, move
the machine backwards and forwards.
6. Check the track tension again, and if the tension is not cor-
rect, adjust it again.