Hitachi ZAXIS 70 Operator's Manual page 177

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 posi-
tion.
CAUTION: Keep body and face away from the air
release 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, and temporarily re-
tighten 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 the drain
plug with sealing-type tape. Install the plug.
Tighten the plug to 50 N m (5.1 kgf m, 36 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. Clean plugs (1) and (2). Wrap the threads of oil level
check plug (2) and air release plug (1) with seal-
ing-type tape. Reinstall the plugs.
Tighten the plugs to 50 N m (5.1 kgf m, 36 lbf ft).
14. Repeat steps 8. to 13. for the other travel reduction
gear.
MAINTENANCE
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M1CC-07-019