Hitachi Zaxis 850LC-3 Operator's Manual page 263

Air Bleeding Procedures
IMPORTANT: Air in the fuel system may make the engine
hard to start or make it run irregularly. After
draining water and sediment from the water
separator, replacing the fuel filter, cleaning
the fuel solenoid pump strainer or running
the fuel tank dry, be sure to bleed the air
from the fuel system.
WARNING: Fuel leaks may lead to fires.
1. Check that fuel cock on the bottom of the fuel tank is
opened.
2. Loosen air bleed plug (2) on the fuel main filter (3).
3. Supply fuel by reciprocating priming pump (6). After no
air bubbles are spouted through air bleed plug (2), lock
the priming pump (6).
4. Supply fuel by reciprocating priming pump (1) of main
filter (3), bleed the remained air.
5. Tighten air bleed plug (2) of main filter (3)
CAUTION: Bleed air from main filter (3) one by one.
IMPORTANT: Over tightening air bleed plug (2)causes
damage.
6. Loose air breather plug (5) of fuel feed pump (4). Supply
fuel by reciprocating priming pump (6) of fuel feed pump
(4), bleed the remained air.
7. Tighten air bleed plug (5) of fuel feed pump (4)
IMPORTANT: Do not over tighten air bleed plug (5).
8. After tightening air bleed plug (1), reciprocate priming
pump (6) approx. 150 strokes.
9. Wipe off any spilled fuel.
10. Start the engine. Check that no fuel leaks are present. If
the engine does not start, repeat the above procedures
from step 1.
Wrench size: 10 mm
MAINTENANCE
1
3
7-51
1
3
4
Fuel cock
M1J7-07-021
2
3
1
M1J1-07-062
6
5
M1J1-07-063