Komatsu BR380JG-1E0, Shop Manual, Page: 276 / 841

SEN02303-00 30 Testing and adjusting
18
BR380JG-1E0
Measuring fuel return rate and
leakage 1
a
Measuring tools for fuel return rate and leakage
a
Since some fuel flows out during check, pre-
pare receiving pan of about 20 liters.
k
Stop the machine on a level ground.
1. Measuring return rate from supply pump
1) Open the engine hood and disconnect
return hose (1) of the supply pump.
a
The return hose is connected by a
quick coupler.
2) Install connector H3 and cap nut [1] of
tester kit H1 to the return hose to stop the
fuel from flowing out.
3) Connect test hose [2] of tester kit H1 to
the supply pump.
a
Lay the test hose so that it will not
slacken and put its end in the receiv-
ing pan.
4) Run the engine at low idle and measure
the return rate in 1 minute with measuring
cylinder
H4 .
a
If the return rate from the supply
pump 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 20 seconds continu-
ously, however, for protection of
the starting motor.
5) After finishing measurement, remove the
measuring tools and return the removed
parts.
a
When measuring the leakage from
the pressure limiter or finishing the
measurement: Return the removed
parts to their original positions.
a
When measuring the leakage from
the injector: Leave the removed parts
as they are and keep the hose end in
the receiving pan.
Symbol Part No. Part name
H
1 795-790-4700 Tester kit
2 795-790-6700 Adapter
3
6754-71-5340 Connector
6754-71-5350 Washer
4
Commercially
available
Measuring cylinder
5
Commercially
available
Stopwatch
At low idle 1,000 cc/min
During cranking 140 cc/min