Bleed Air From The Fuel System; Air Bleeding Procedure - Hitachi ZW 550-6 Operator's Manual

Wheel loader
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5. After draining water, securely tighten drain (1) and
plug (3). Draining off of two pre-filters.
Tightening torque:
Drain (1): 2.5±0.5 N·m (0.25±0.05 kgf·m, 1.8±0.4
lbf·ft)
Plug (3): 10±2 N·m (1.0±0.2 kgf·m, 0.74±0.15 lbf·ft)
6. Start the engine. Check drain (1) and plug (3) for fuel
leaks.
IMPORTANT: After draining water from the fuel filter,
bleed air from the fuel supply system.
IMPORTANT: Do not use alcoholic gas dryer fuel
additives to remove water in fuel to avoid cracks in
the pre-filter transparent case.

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 (6).
d
CAUTION: Fuel leaks may lead to fires.
1. Turn the key switch to ON position. Fuel priming
solenoid pump (6) operates to help prime the fuel
system.
IMPORTANT: DO NOT start the engine.
2. Loosen air bleed plug (7) at the outlet port of fuel
priming solenoid pump (6).
Loosen air bleed plug (9) on supply pump (8).
Loosen air bleed plug (12) on fuel main filter (11).
MAINTENANCE
[Machine RH Side]
7-60
Pre-Filter
3
95Z7-7-59-1
1
95Z7-7-59-2
11
7
6
115Z7B-7-61-3

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