Komatsu PC200-8M0, Shop Manual

Page: 378 / 1254

SEN06127-00
30-101
26
PC200, 200LC, 220, 220LC-8M0
101 Testing and adjusting, Part 1
Bleeding air from fuel circuit
7) Start the engine. By using measuring cyl-
inder G4, measure the return rate from the
injector for 1 minute with the engine speed
at low idle.
a
You may make the measurement for
20 seconds and multiply the mea-
sured result by 3.
a
If the return rate from the supply
pump is within the following standard
range, it is normal.
k If you cannot start the engine, you
may measure the return rate with
the engine cranked with the start-
ing motor. However, for protection
of the starting motor, do not keep
cranking continuously for 20 sec-
onds or longer.
8) Remove the tools after finishing measur-
ing. Be sure to restore the machine.
3 Joint bolt:
19.6 to 29.4 Nm {2.0 to 3.0 kgm}
Bleeding air from fuel circuit 1
a
If fuel is used up or if a fuel circuit part is
removed and installed, bleed air from the fuel
circuit according to the following procedure.
k Stop the machine on a level ground and
lower the work equipment to the ground.
1. Fill up fuel tank with fuel.
a
Add fuel until the float of the sight gauge
reaches the maximum position.
2. Open the side cover of the pump room.
3. Loosen knob (1) of the feed pump and pull it
out, and then operate it forward and backward.
a
Move the knob until it becomes heavy.
a
The plug at the top of the fuel main filter
does not need to be removed.
a
After bleeding air, some air may be left in
the water separator. If the feed pump is
operated until it becomes heavy, however,
the engine can be started. The remaining
air is bled naturally while the engine is run-
ning for a while. This phenomenon occurs
when the fuel in the fuel prefilter is drained
too much and does not indicate an abnor-
mality or a trouble.
4. After bleeding air, push in and tighten knob (1).
Low idle Max. 180 cc
Cranking Max. 90 cc