Case WX145 Operator's Manual page 209

SECTION 4
AIR BLEEDING
When components on the fuel delivery line are
replaced, the air bleeding from the system is per-
formed automatically.
When the fuel line under high pressure is disassem-
bled or replaced, the air bleeding is not required for
engine start-up. The fuel pump during start-up gen-
erates high pressure inside of fuel and discharges
the air through the injectors at high pressure side.
If such an amount of air, plenty exceeding the aver-
age required, should penetrate into the system,
bleed the fuel system immediately.
Loosen the delivery line on the injection pump (1).
Activate repeatedly lever (2) on the delivery pump,
until air is completely bleeded from the system.
Once the air has been completely relieved, connect
the fitting again. The fuel pump is activated by the
camshaft of the engine block at the side directed
towards the cab. The fuel pump is accessible
through the rear cover of the panelling right.
If air bubbles are still noticed for several minutes, air
is penetrating into the system. Because of breaks or
pores in the welding link, fastening the hose to the
connector, air can penetrate into the fuel system.
Check for the presence of leaks on all hoses and
connections, as well as on the fuel filter.
An injector jammed to open position, can generate
the return of exhaust gas to the pump, and the pres-
ence of too much air into the system. Start the
engine and check the hoses. If exhaust gas returns
through the hoses, the injector is still open or
jammed.
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