Komatsu ecot3 PC300LC-8 Shop Manual page 361

30 Testing and adjusting
3) Run the engine at high idle and measure the
pressure in the fuel negative pressure circuit.
a If the pressure in the fuel negative pres-
sure circuit is in the following range, it is
normal.
Standard pressure value in the fuel nega-
q
tive pressure circuit (supply pump) Max.
33.9 kPa {Max. 254 mmHg}
4) After finishing measurement, remove the
measuring tools and return the removed
parts.
q Fuel pressure pickup plug:
3. Measuring pressure in the fuel low-pressure
circuit (fuel filter inlet side)
1) Remove fuel pressure pickup plug (3) situ-
ated at the fuel main filter inlet side.
2) Install adapterG2 and nipple [1] of hydraulic
tester G1 and connect them to gauge G3.
PC300, 350-8
20 - 22 Nm {2.0 - 2.2 kgm}
3) Measure pressure in the fuel low-pressure
circuit when the engine is cranked.
a If the pressure in the fuel low-pressure cir-
cuit (at the fuel filter inlet side) is in the fol-
lowing range, it is normal.
Standard pressure values of the fuel
q
low-pressure circuit (fuel filter inlet side)
Min. 0.14 MPa {Min. 1.4 kg/cm
k
In order to protect the starting motor, it
is prohibited to continue cranking for
more than 20 seconds.
4) After finishing measurement, remove the
measuring tools and return the removed
parts.
q Fuel pressure pickup plug:
20 - 22 Nm {2.0 - 2.2 kgm}
SEN02625-06
2
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