Bleed Air From The Fuel System - Hitachi ZW 370-6 Operator's Manual

Bleed Air from the Fuel System

Air in the fuel system may make the engine hard to start
or make it run rough or not run at all.
After draining water and sediment from the fuel filter,
replacing the fuel filter, cleaning the fuel pump strainer
or running the fuel tank dry, be sure to bleed the air from
the fuel system according to the following procedure.
Air Bleeding Procedure
This machine is equipped with a fuel priming solenoid
pump (5).
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CAUTION: Fuel leaks may lead to fires.
1. Turn the key switch to ON position. Fuel priming
solenoid pump (5) operates to help prime the fuel
system.
IMPORTANT: DO NOT start the engine.
2. Loosen air bleed plug (6) at the outlet port of fuel
priming solenoid pump (5).
Loosen air bleed plug (8) on supply pump (7).
Loosen air bleed plug (11) on fuel main filter (10).
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.
MAINTENANCE
[Machine LH Side]
7
7-60
5
8 9
10
10
6
95Z7B-7-61-3
95Z7B-7-61-2
11
95Z7B-7-61-1