Hitachi EX1900-5 Operator's Manual page 185

Air Bleeding Procedures
Bleeding Air from Pump
IMPORTANT: If the hydraulic pump is not filled with oil,
it will be damaged when the engine is
started.
1. Loosen hoses (7) and (8) on the pump to release
trapped air. Retighten hoses (7) and (8) after oil flows
from the pump.
Bleeding Air from Hydraulic Circuit
2. Refill hydraulic oil.
3. Start the engine and run at slow idle.
4. Purge air from the hydraulic circuit while operating
each cylinder and swing motor slowly for approx. 15
minutes.
5. Position the front attachment as illustrated in the oil
level checking posture.
6. Check the hydraulic oil tank gauge. Add oil if neces-
sary.
MAINTENANCE
8
7-53
7
M18C-07-064
M142-07-092
M117-07-126