Komatsu Galeo PC138US-8 Shop Manual page 346

SEN02458-01
2. Testing leakage from pressure limiter
1) Lay test hose G4 so that it will not slacken
and put its end in the oil pan.
2) Start the engine and keep its speed at
1,600 rpm with no load.
3) After the engine speed is stabilized, test
the leakage in 1 minute with measuring
cylinder G6.
a You may test for 20 seconds and
judge by multiplying the result by 3.
a If the leakage from the pressure lim-
iter is in the following standard range,
it is normal.
Engine speed
(rpm)
1,600
4) After finishing test, stop the engine.
18
3.
Leakage
(cc/min)
Max. 20
4.
30 Testing and adjusting
Testing return rate from injector
a While testing the return rate from the
injector, keep the test hose on the pres-
sure limiter side connected and keep its
end in the oil pan.
1) Run the engine at the rated output.
2) After the engine speed is stabilized, test
the return rate in 1 minute with measuring
cylinder G6.
a You may test for 20 seconds and
judge by multiplying the result by 3.
a If the supply pump pressure is low,
the engine speed may not rise. In this
case, record the engine speed, too,
during the test.
a If the return rate (spill) from the injec-
tor is in the following standard range,
it is normal.
Rated output
speed (rpm)
1,600
1,700
1,800
1,900
2,000
3) After finishing test, stop the engine.
After finishing test, remove the testing tools
and return the removed parts.
3
Joint bolt: 3.9 – 6.9 Nm {0.4 – 0.7 kgm}
Limit of return rate
(spill) (cc/min)
190
200
210
220
230
PC138US, USLC-8