Komatsu 75001, Shop Manual

Page: 411 / 1293

SEN03836-01
30-110
28
WA250, 250PZ-6
110 Testing and adjusting, Part 1
Measuring fuel return rate and leakage
3. Measuring leakage from pressure limiter
1)
Open the engine right side cover.
2) Disconnect return hose (2) from the pres-
sure limiter.
a Install the seal washer to the connec-
tor bolt.
3) Install removed connector bolt (3) and cap
nut [1] of tester kit H1 to the return hose to
stop the fuel from flowing out.
4) Install connector H3 to the common rail
and connect test hose [2] of tester kit H1.
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 leakage in 1 minute with measuring
cylinder H4.
a If the leakage from the pressure limiter
is in the following range, it is normal.
6) After finishing measurement, remove the
measuring tools and return the removed
parts.
3 Joint bolt:
24 ± 4 Nm {2.4 ± 0.4 kgm}
4. Measuring return rate from injector
a The leakage from the injector is measured
while the return hose of the pressure lim-
iter is connected. Accordingly, before
measuring the leakage from the injector,
check that the leakage from the pressure
limiter is normal.
1) Referring to “Measuring return rate from
supply pump”, set the supply pump for
measurement.
k The fuel returning from the supply
pump flows out during measure-
ment of the return rate from the
injector. Accordingly, keep the test
hose end in the receiving pan.
2) Remove connector bolt (4) of the return
block.
At low idle
0 cc
(No leakage)