Komatsu PC2000-8 BACKHOE, Operation & Maintenance Manual

Page: 363 / 504

MAINTENANCE
MAINTENANCE PROCEDURE
4-45
BLEEDING AIR FROM FUEL CIRCUIT 4
In the following cases, carry out the procedure given below to bleed the air from the fuel circuit.
q
When fuel filter has been replaced
q
When engine has run out of fuel
q
When starting the engine for the first time after replacing the supply pump or modifying the piping or any other
parts
WARNING
q
After the engine is stopped, all parts are at high temperature, so there is danger of suffering burns.
Wait for all parts to cool down before starting the operation.
q
When the air breather of the supply pump or the air bleed plug at the top of the fuel filter head is
opened, the residual pressure may spray out fuel. Loosen the plug and breather slowly before open-
ing.
NOTICE
The common rail type fuel injection system used on this machine consists of higher precision parts than
the conventional injection pump and nozzle. This means that problems are more likely to occur when
dust or dirt gets in. If any dirt should be stuck to any part of the fuel system, use fuel to wash it off com-
pletely.
For details of the poor fuel arrangement specification machines (if equipped), see “Bleeding air from fuel circuit
with the electric priming pump (4-47)“.
1. Loosen air bleed plug (1) at the top of the fuel filter head.
(One place each on left and right sides of engine)