Test Fuel Pressure; Method For Testing Fuel Pressure - Komatsu PC500LC-10R Shop Manual

30 TESTING AND ADJUSTING

TEST FUEL PRESSURE

Tools for testing fuel pressure
Symbol Part No.
- 799–101–5002 Hydraulic tester
A
1 799–101–5160 Nipple
B 799–401–2320 Gauge
k
Place the machine on a level ground, lower the work equipment completely to the ground in a stable
posture, set the lock lever to LOCK position, and then stop the engine.
k
Do not measure the pressure in the high-pressure circuit from the supply pump through the com-
mon rail to the injector. The pressure is very high and dangerous.
k
Wait for the remaining pressure in the fuel circuit to have been released, for at least 30 seconds after
stopping the engine. Then, perform removing or installing the testing tools. (Do not start the work
immediately after the engine is stopped since remaining pressure is still in the circuit.)
NOTICE
Measure the fuel pressure only in the low-pressure circuit from the feed pump through the fuel main fil-
ter to the supply pump.
For testing the fuel pressure to perform troubleshooting, refer to this section.

METHOD FOR TESTING FUEL PRESSURE

1.
Open the cover (1) on the left side of the machine.
2.
Remove the fuel pressure pickup plug (2) (inlet side) of the
fuel filter head.
PC500LC-10R
Part name
TEST FUEL PRESSURE
Q'ty Remarks
1
1 Size: R1/8
1 Pressure range: 1 MPa
30-39