Komatsu ecot3 PC300LC-8 Shop Manual page 897

50 Disassembly and assembly
k
Don't correct high-pressure tube by bend-
ing it for re-use.
k
Always use genuine clamp for fixing high-
pressure pipe. Strictly observe the tighten-
ing torque requirements.
k
Keep the harness assembly and other har-
nesses 10 mm and above away from the
high-pressure tube.
a Before installing the high-pressure pipe, check
it for the following defects. If there are any of
these defects, it can cause fuel leakage.
Accordingly, replace the high-pressure pipe.
q Check the taper seal of the connecting part
(Part (a): Part of 2 mm from the end) for visible
lengthwise slit (b) and dent (c).
q Check part (d) (end of the taper seal: Part at 2
mm from the end) for stepped-type wear
(fatigue) which your nail can feel.
a Install the common rail and high-pressure pipe
according to the following procedure.
1) Tighten the mounting bolts of common rail
(36) temporarily (with the fingers)
2) Tighten drain tube (35) temporarily.
3) Install supply pump outlet high-pressure
pipe (18).
3
Sleeve nut:
37.3 ± 4 Nm {3.8 ± 0.4 kgm}
4) Install bracket (17) and tighten clamp (82)
temporarily.
PC300, 350-8
5) Install 6 high-pressure pipes (28) between
the common rail and injectors.
a Install the high-pressure pipes of the
No. 1, No. 3, and No. 5 cylinders
while the injector wiring harness con-
nectors are disconnected.
3
Sleeve nut:
37.3 ± 4 Nm {3.8 ± 0.4 kgm}
6) Tighten drain tube (35) permanently.
3
Joint bolt:
7) Tighten the mounting bolts of common rail
(36) permanently.
3
Mounting bolt:
43.1 ± 4.0 Nm {4.4 ± 0.4 kgm}
8) Tighten clamp (82) permanently.
[*6]
a When installing the No. 1 – No. 6 injector high-
pressure pipes and supply pump outlet high-
pressure pipe, set the slits of the bellows at
both ends of them in the following directions.
No. 1 – No. 6 injector high-pressure pipes
q
(injector side): Down
(Common rail side): Out
Supply pump outlet high-pressure pipe
q
(supply pump side and
common rail side): Out
SEN02636-03
24 ± 4Nm {2.4 ± 0.4 kgm}
19