Hitachi EX1900-5 Operator's Manual page 177

Change Gear Oil --- every 2000 hours
1. Park the machine on a level surface.
2. Lower the bucket to the ground.
3. Turn the auto-idle switch off.
IMPORTANT: The turbocharger may be damaged if the
engine is not properly shut down.
4. Run the engine at slow idle speed without load for five
minutes.
5. Stop the engine. Remove the key from the key switch.
6. Pull the pilot control shut-off lever to the LOCK
position.
CAUTION: Keep body and face away from oil
level check plug (air release plug) (1). Gear oil is
hot. Wait for gear oil to cool and then gradually
loosen oil level check plug (air release plug) (1) to
release pressure.
7. After gear oil has cooled, slowly loosen oil level check
plug (air release plug) (1) to release pressure.
8. Remove drain plugs (2) to drain oil.
9. Wrap the threads of drain plug (2) with sealing- type
tape. Install drain plug (2).
Tighten the plug to 69 N m (7 kgf m, 51 lbf ft).
10. Remove oil level check plug (1).
11. After oil supply plug (3) has removed, add oil until oil
flows out of the oil level check plug hole. (See gear oil
chart)
12. Wrap the threads of oil level check plug (1) with
sealing-type tape. Reinstall oil level check plug (1)
and tighten it to 195 N m (20 kgf m, 145 lbf ft).
13. Wrap the threads of oil supply plug (3) with sealing-
type tape. Reinstall oil supply plug (3) and tighten it to
69 N m (7kgf m, 51 lbf ft).
14. Repeat steps 7 to 13 for the other travel reduction
gear.
NOTE: Be sure to refill gear oil through both oil supply
plugs ( 1 and 3).
MAINTENANCE
(first time after 500 hours)
1
2
Park the machine so that this bolt is
just at the bottom position.
3
7-45
M144-07-017
M144-12-002
2
3