Komatsu 114E-3 Series Shop Manual page 134

SEN00455-01
a If the drop exceeds the standard
value, clogging of the fuel filter is sus-
pected.
4) After finishing testing, remove the testing
tools and return the removed parts.
3
Fuel pressure pickup plug:
6. Testing fuel lift pump outlet pressure (sup-
ply pump section)
1) Remove fuel pressure pickup plug (2) of
the supply pump.
2) Connect M10 computer check fitting G4 to
gauge G3.
16
20 – 22 Nm {2.0 – 2.2 kgm}
30 Testing and adjusting
3) Turn the starting switch ON, operate fuel
lift pump (5), and measure the fuel lift
pump outlet pressure.
Reference: Fuel lift pump (5) is installed to
cooling plate (7) on the back side of
engine controller (6).
a The fuel lift pump operates for 30 seconds
after the starting switch is turned ON and
then stops. Measure the pressure while
the pump is operating.
a If the fuel lift pump outlet pressure is in the
following standard range, it is normal.
Standard fuel lift pump outlet pressure
q
(supply pump section):
Min. 34 kPa {0.35 kg/cm
a If the fuel lift pump outlet pressure is not in
the standard range, perform the following
checks.
Check that fuel is in the fuel lift pump.
q
If fuel is not in the fuel lift pump just
q
after the fuel filter is replaced or a fuel
system part is removed and returned,
operate the fuel lift pump 3 – 4 times
with the starting switch to bleed air
from the fuel circuit and fill the pump
with fuel and then measure the outlet
pressure again.
2
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114E-3 Series