Komatsu PC200-8M0, Shop Manual

Page: 371 / 1254

SEN06127-00
PC200, 200LC, 220, 220LC-8M0 30-101
19
101 Testing and adjusting, Part 1
Testing fuel pressure
Testing fuel pressure 1
a
Measuring tools for fuel pressure
k Stop the machine on a level ground and
lower the work equipment to the ground.
a
Measure only the fuel pressure in the low-pres-
sure circuit from the feed pump through the
fuel main filter to the supply pump and the
return circuit from the supply pump/common
rail/injector to fuel tank.
k Since the pressure in the high-pressure cir-
cuit from the supply pump through the
common rail to the injector is very high, it
cannot be measured.
1. Measuring pressure in fuel low-pressure
circuit
1) Open the engine hood and remove fuel
pressure pickup plug (1) from the fuel
main filter.
2) Install adapter F2 and nipple [1] of hydrau-
lic tester F1 and connect them to oil pres-
sure gauge [2]
a
Use the oil pressure gauge of 2.5 MPa
{25 kg/cm
2
}.
3) Run the engine at low idle and measure
the pressure in the fuel low-pressure cir-
cuit.
a
If the pressure in the fuel low-pres-
sure circuit is in the following range, it
is normal.
k If the engine cannot be started, you
may measure the fuel return rate
while rotating the engine with the
starting motor. Do not rotate for
more than 30 seconds continu-
ously, however, for protection of
the starting motor.
4) After finishing measurement, remove the
measuring tools and return the removed
parts.
3
Fuel pressure pickup plug:
10 ± 2 Nm {1 ± 0.2 kgm}
Symbol Part No. Part name
F
1
799-101-5002 Hydraulic tester
790-261-1204 Digital hydraulic tester
2
795-790-4430
Adapter
(10 × 1.0 mm
o
R1/8)
6215-81-9710 O-ring
3 799-401-2320 Gauge
4 795-790-5110 Screw
5 799-201-2202 Boost gauge kit
6 07005-01212 Gasket
At low idle
0.5 to 1.3 MPa
{5.1 to 13.3 kg/cm
2
}
During cranking
0.3 to 1.1 MPa
{3.1 to 11.3 kg/cm
2
}