Hitachi Zaxis 850LC-3 Operator's Manual page 240

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 en-
gine is not properly shut down.
5. Run the engine at slow idle speed without load for three
minutes.
6. Stop the engine. Remove the key from the key switch.
7. Pull the pilot control shut-off lever to the LOCK position.
WARNING: Keep body and face away from the air re-
lease plug. Gear oil is hot. 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.
9. Remove drain plug (3) to drain oil.
10. Wrap the threads of the drain plug with sealing-type
tape. Install the plug.
Tighten the plug to 69 N•m (7 kgf•m, 51 lbf•ft).
11. Remove oil level check plug (2).
12. Add oil until oil flows out of the oil level check plug hole.
(See gear oil chart)
13. Wrap the threads of oil level check plug (2) and air release
plug (1) with sealing-type tape. Reinstall the plugs.
Tighten the plugs to 69 N•m (7 kgf•m, 51 lbf•ft).
14. Repeat steps 8 to 13 for the other travel reduction gear.
MAINTENANCE
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M17V-07-019