Komatsu PC210LC-6K Operation & Maintenance Manual page 202

24. SERVICE PROCEDURE
BLEEDING THE FUEL SYSTEM
Controlled venting is provided at the injection pump through the fuel drain
manifold. Small amounts of air introduced by changing the filters or injec-
tion pump supply line will be vented automatically, if the fuel filter is
changed in accordance with the instructions.
However, manual bleeding will be required if :
• The fuel filter is not filled prior to installation.
• Injection pump is replaced.
• High pressure fuel lines are replaced.
VENTING THE LOW PRESSURE LINES AND
FUEL FILTER
1. Open the bleed screw. (wrench size: 10 mm.)
2. Operate the hand lever until the fuel flowing from the fitting is free of
air.
Tighten the bleed screw to 9 N.m. (7 ft-Ibs).
3. Air/fuel can be pumped from this location with the hand lever on the
lift pump if the fuel solenoid valve is energised.
4. Air can be vented from both pumps through the fuel drain manifold
line by operating the starting motor.
When using the starting motor to vent the system, do not engage it
for more than 30 seconds at a time: wait two (2) minutes between
engagements.
It is necessary to put the engine in the "RUN" position. Be-
cause the engine may start, be sure to follow all the safety
precautions. Use the normal starting procedure.
VENTING THE HIGH PRESSURE LINES
Loosen the fittings at the injectors, and crank the engine to allow en-
trapped air to bleed from the lines. Tighten the fittings to 30 N.m. (22 ft.-
lbs) (wrench size: 17 mm.)
CAUTION: High pressure could cause penetration of the skin.
Do not bleed a hot engine as this could cause fuel to spill onto
a hot exhaust manifold creating a danger of fire.
Start the engine and vent one line at a time until the engine
runs smoothly.
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WARNING
WARNING