Komatsu D31EX-21, Operation & Maintenance Manual, Page: 231 / 256

MAINTENANCE
SERVICE PROCEDURE
4-51
EVERY 1000 HOURS SERVICE 4
Maintenance for every 50, 250 and 500 hours should be carried out at the same time.
CHANGE OIL IN FINAL DRIVE CASE 4
WARNING
q
The oil is at high temperature immediately after the machine has been operated. Wait for the oil to cool
down before starting the operation.
q
If there is still pressure remaining inside the case, the oil or plug may fly out.
Loosen the plug slowly to release the pressure.
q
Prepare a handle.
q
Refill capacity: each 3.5 liters
1. Set the TOP mark at the top, with the UP mark and plug (P)
perpendicular to the ground surface.
2. Set a container under plug (P) to catch the oil.
3. Remove plugs (P) and (F) with the handle and drain the oil.
REMARK
Check the O-rings in the plugs for damage. If necessary,
replace with new ones.
4. Tighten plug (P).
5. Add oil through the hole of plug (F).
6. When oil begins to overflow from the plug (F) hole, install
plug (F).
Tightening torque of plugs (P) and (F):
68.6 ± 9.8 N·m (7 ± 1 kgf·m)
CHECK FAN BELT TENSION, ADJUST 4
Since inspection and replacement of the fan belt require special tools, contact your Komatsu distributor.
REMARK
The machine is equipped with an auto tensioner, so there is no need to adjust the tension.
CHECK ALL TIGHTENING PARTS OF TURBOCHARGER 4
Contact your Komatsu distributor to have the tightening portions checked.