Hitachi 090001, Operator'S Manual

Page: 305 / 442

MAINTENANCE
7-31
Change Gear Oil --- every 2000 hours
1. Park the machine on a level surface.
2. Rotate the travel motor until the imaginary line through
plug (1) and plug (3) is vertical.
3. Lower the bucket to the ground.
4. Turn the auto-idle switch off.
IMPORTANT: The turbocharger may be damaged if the
engine is not properly shut down.
5. Run the engine at slow idle speed without load for five
minutes.
6. Stop the engine. Remove the key from the key switch.
7. Pull the pilot control shut-off lever to the LOCK position.
d
CAUTION: Keep body and face away from the air
release plug. Gear oil may be hot just after operation.
Wait for gear oil to cool and then gradually loosen the
air release plug to release pressure.
8. After gear oil has cooled, slowly loosen air release plug
(1) to release pressure, and temporarily retighten plug
(1).
9. Remove drain plug (3) and plug (1), in that order, to drain
oil.
10. Clean drain plug (3). Wrap the threads of drain plug (3)
with sealing-type tape. Install plug (3). Tighten plug (3).
Tightening Torque: 50 N·m (5 kgf·m)
11. Remove oil level check plug (2).
12. Add oil until oil flows out of oil level check plug (2) hole.
(See gear oil chart)
13. Clean plugs (1) and (2). Wrap the threads of oil level
check plug (2) and air release plug (1) with sealing-type
tape. Reinstall the plugs (1) and (2). Tighten the plugs (1)
and (2).
Tightening Torque: 50 N·m (5 kgf·m)
14. Repeat steps 8. to 13. for the other travel reduction gear.
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3
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M157-07-170