Komatsu 75001, Shop Manual

Page: 410 / 1293

SEN03836-01
WA250, 250PZ-6 30-110
27
110 Testing and adjusting, Part 1
Measuring fuel return rate and leakage
2. Measuring return rate from supply pump
1)
Open the engine right side cover.
2) Disconnect return hose (1) of the supply
pump.
a The return hose is connected by a
quick coupler.
3) Install connector H3 and cap nut [1] of
tester kit H1 to the return hose to stop the
fuel from flowing out.
4) 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.
5) Run the engine at low idle and measure
the return rate in 25 seconds with measur-
ing 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 return rate while
rotating the engine with the start-
ing motor. Do not rotate for more
than 25 seconds continuously,
however, for protection of the start-
ing motor.
6) 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 test hose
end in the receiving pan.
At low idle Max. 400 cc