Bleeding Air From Fuel Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02625-06

Bleeding air from fuel circuit

a If fuel is used up or if a fuel circuit part is removed
and installed, bleed air from the fuel circuit using
the electric priming pump according to the fol-
lowing procedure.
1. If fuel main filter (1) is removed and installed or
replaced, install it back without filling fuel into the
fuel main filter.
2. Remove fuel pre-filter (on the machine) and fill it
with fuel.
a Fill the fuel filter with clean fuel and take care
that dirt will not enter it.
a Check that the cap is fitted to part (a) (central
hole) of the fuel pre-filter, and then add fuel
through part (b) (holes around the central
hole).
a After filling the fuel pre-filter with fuel, remove
the cap from part (a).
a If clean fuel is not available, do not remove
the fuel pre-filter but fill it with the fuel by op-
erating priming pump.
a Do not add fuel to fuel main filter (1) from out-
side.
28
3. Fill up the fuel tank with fuel.
4. Keep the starting switch at the ON position for 30
seconds and keep it at the OFF position for 10
seconds.
5. Repeat Step 3 above four times.
6. Start the engine with the starting motor.
a The air in the high-pressure circuit is bled au-
tomatically if the engine is cranked.
a If the engine does not start, there may be still
air in the low-pressure circuit. In this case, re-
peat the above procedure from step 2.
a Operating the machine with air left in the fuel
circuit may cause a fuel system error
(CA449,CA559). If either error occurs, run
the engine at low idle after performing the
above steps, and continue engine operation
approximately 3 minutes. When air is bled
from the fuel circuit, engine speed becomes
stable and the error indication disappears.
30 Testing and adjusting
PC300, 350-8