Komatsu PC500LC-10R Shop Manual page 448

TEST FUEL RETURN RATE AND LEAKAGE
3.
Remove the tube (3) which is between common rail (1)
and return block (2).
4.
Insert spacer A with gaskets at both ends to return block
(2) side and retighten it with the removed joint bolt.
3
Joint bolt:
24.5 to 34.3 Nm {2.5 to 3.5 kgm}
5.
Insert joint B with gaskets at both ends to common rail (1)
side and retighten it with the removed joint bolt.
3
Joint bolt:
17.7 to 22.6 Nm {1.8 to 2.3 kgm}
6.
Connect the test hose C to the end of joint B.
REMARK
Bind the connecting part of test hose C with a wire, etc. to prevent it from coming off.
Adjust the route of test hose C so that it does not slack, and insert its end to measuring cylinder E.
7.
Start the engine. Turn the fuel control dial to MAX (High idle) position, and relieve the oil pressure in the
arm IN circuit with the swing lock switch ON in working mode.
8.
After the engine speed is stabilized, measure the leakage
amount for 1 minute with measuring cylinder E.
REMARK
You can obtain the leakage amount by multiplying the re-
sult of 20 seconds by 3.
For standard values, see STANDARD VALUE TABLE,
"STANDARD VALUE TABLE FOR ENGINE".
Testing the fuel return rate from injector
While you are measuring the injector return rate, keep the hose on the pressure limiter side connected and keep
its end in oil pan G.
1.
Disconnect the fuel return hose (4) of return block (2).
REMARK
Plug the fuel hose side with plug H.
2.
Connect the test hose D to return block (2) side.
REMARK
Bind the connecting part of test hose D with a wire, etc. to
prevent it from coming off.
Adjust the route of the test hose D so that it does not
slack. Insert its end to the measuring cylinder E.
30-42
30 TESTING AND ADJUSTING
PC500LC-10R