Travel Reduction Gear - Hitachi 120-3 class Operator's Manual

3

Travel Reduction Gear

Check Oil Level --- every 250 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.
WARNING: Keep body and face away from the air
release plug. Gear oil is 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.
9. Remove air release plug (1) and oil level check plug (2).
Oil must be up to the bottom of hole.
10. If necessary, add oil until oil flows out of the oil level
check plug hole. (See gear oil chart)
11. Wrap the plug threads with sealing-type tape. Install
plugs (1) and (2).
Tighten plugs (1) and (2) to 50 N•m (5.1 kgf•m).
12. Check the gear oil level in the other travel reduction gear.
MAINTENANCE
Horizontal Oil Level
7-25
Air Release Plug 1
(Oil Supply Plug)
Drain Plug 3
Oil Level Check
Plug 2
M104-07-019
1
2
M157-07-170