If Air Mixed After Common Rail - Hitachi ZW 550-6 Operator's Manual

3. Keep the key switch at ON position while operating
priming pump (9) of supply pump (7) until fuel with
no air bubbles comes out from air bleed plug (6) at
the outlet port of fuel priming solenoid pump (5).
Tighten air bleed plug (6).
4. Bleed air of supply pump (7) and fuel main filter (10)
in the same manner respectively. Verify that fuel with
no air bubbles come out from air bleed plugs (8)(11).
5. Keep the key switch at ON position for at least 30
seconds after priming main fuel filter (10).
6. Once the engine is started, slowly increase the
engine speed while air is purged from the fuel line.
7. Check the fuel supply system for fuel leaks.
IMPORTANT: Even if air is not thoroughly bled of fuel
priming solenoid pump (5) at step 3, do not hold
the key switch in the ON position for more than 5
minutes. In this case, first return the key switch to
the OFF position. Then, after waiting for more than
30 seconds, turn the key switch ON again. Failure to
do so may cause damage to fuel priming solenoid
pump (5) and/or discharging the batteries.

If Air Mixed After Common Rail

d
WARNING: INJECTION HAZARD
Fuel under high pressure
High pressure common rail, high pressure lines fuel
lines and high pressure fuel injection lines contain
high pressure fuel.
High pressure fuel injection into skin can cause
injury or death.
Keep hands away from injection lines while turning
engine with starter or while running engine.
In case air mixed in the fuel system due to lack of
fuel and the engine is difficult to start, release air by
following the procedure given below.
1. Bleed air until supply pump (7) inlet sufficiently
according to the above-mentioned procedures.
2. Operate starter motor for long cranking within 20
seconds. If engine fails to start, return key switch to
OFF. Wait more than about 60 seconds, and then try
again.
MAINTENANCE
10
7-61
7
8 9
115Z7B-7-61-2
11
95Z7B-7-61-1