Komatsu D31EX-21, Operation & Maintenance Manual, Page: 233 / 256

MAINTENANCE
SERVICE PROCEDURE
4-53
EVERY 2000 HOURS SERVICE 4
Maintenance for every 50, 250, 500 and 1000 hours service should be carried out at the same time.
CHANGE OIL IN HYDRAULIC TANK, REPLACE OIL FILTER CARTRIDGE AND CLEAN
SUCTION STRAINER
4
WARNING
q
The parts and oil are at high temperature after the engine is stopped, and may cause burns. Wait for
the temperature to go down before starting the work.
q
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
q
Refill capacity: 44 liters
1. Lower the blade to the ground securely, stop the engine
and slowly turn the cap of oil filler (F) to release the internal
pressure. Then, remove the cap.
2. Remove the cover (1) at the bottom of the hydraulic tank.
3. Place a container to receive drained oil on the track under
the drain hole.
4. Loosen drain valve (2) at lower side of hydraulic tank to
drain the oil, then tighten valve (2) again.
When loosening drain valve (2), be careful not to get the oil
on you.
5. For the cab specification machine, cancel lock (3) of the
inspection cover at the right side at the rear of the machine,
remove the bolts, then remove rear cover (4).
Remove the washer tank.
6. For machines other than the cab specification machines,
remove the bolts, then remove the cover at the right side at
the rear of the machine and center cover (4) at the rear.