Komatsu Utility 76243, Operation & Maintenance Manual

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OPERATION
TROUBLESHOOTING
3-139
TROUBLESHOOTING 3
AFTER RUNNING OUT OF FUEL 3
When starting the engine again after running out of fuel, fill with fuel, then bleed the air from the fuel system before
starting the engine.
Always watch the fuel level and be careful not to run out of fuel.
If the engine has stopped because of lack of fuel, it is necessary to use the priming pump to bleed the air com-
pletely from the fuel circuit.
PROCEDURE FOR BLEEDING AIR 3
CAUTION
This engine consists of higher precision parts than on the conventional fuel injection pump and nozzle, so
if dirt gets in, it will cause problems. If there is any dirt stuck to the fuel line, use fuel to wash it off com-
pletely.
Be careful when opening the air bleed plug at the fuel filter head and the air bleeder of the supply pump.
The system is still under pressure and fuel may spurt out.
1. Loosen air bleed plugs (A) and (B) in fuel filter head (2).
2. Remove bolt (6) and nut (7) of priming pump (3), then oper-
ate lever (5). Check that bubbles come out with the fuel
from air bleed plug (A).
3. Wrap sealing tape around air bleed plug (A) before tighten-
ing it.
Tightening torque: 2.0 to 3.9 N·m (0.2 to 0.4 kgf·m)
4. Operate the priming pump again and check that no more
bubbles come out with the fuel from air bleed plug (B).
5. Tighten air bleed plug (B).
Tightening torque: 4.9 to 6.9 N·m (0.5 to 0.7 kgf·m)
6. Loosen air bleeder (4) of the supply pump.
7. Pump priming pump (3) (approx. 90 to 100 times) until no
more bubbles come out with the fuel from air bleeder (4),
then tighten air bleeder (4).
Tightening torque: 4.9 to 6.9 N·m (0.5 to 0.7 kgf·m)