Measuring Fuel Return Rate And Leakage - Komatsu WA250-6 Shop Manual

SEN03836-01
Measuring fuel return rate and
leakage
a Necessary tools
Symbol Part No.
1 795-790-4700 Tester kit
2 795-790-6700 Adapter
6754-71-5340 Connector
3
6754-71-5350 Washer
Commercially
H
4
available
Commercially
5
available
Commercially
6
available
a Prepare receiving pan of about 20 liters to
receive the fuel flowing out during measure-
ment.
k
Put chocks under the tires securely.
k
When measuring, check that there are no
persons around the machine.
1. Measuring supply pump delivery
1) Open the engine right side cover.
2) Loosen clamp (1) of supply pump dis-
charge tube (2) and disconnect the tube.
3) Install test hose H6 to the nipple on the
discharge side of the supply pump.
a Fix the hose with a wire etc.
a Adjust the route of the test hose so
that it will not slacken and put its end
in receiving pan.
26
30-110
Part name
Measuring cylinder
Stopwatch
Hose (Inside diameter 14 mm)

Measuring fuel return rate and leakage

1
4) Crank the engine for 30 seconds and
measure the delivery with measuring cyl-
inder H4.
a Adjust the route of the test hose so
that it will not slacken and put its end
in receiving pan.
a Do not crank the engine for more than
30 seconds to protect the starting
motor in any case other than this
measurement.
a If the supply pump delivery is in the
following standard range, it is normal.
At cranking speed
(125 rpm)
At cranking speed
(150 rpm)
5) After finishing measurement, remove the
measuring instruments and return the
removed parts.
3
Tube sleeve nut:
3
Clamp mounting bolt:
110 Testing and adjusting, Part 1
Min. 75 cc
Min. 90 cc
35 ± 4 Nm {3.6 ± 0.4 kgm}
10 ± 2 Nm {1.0 ± 0.2 kgm}
WA250, 250PZ-6