Iran Tractor ITM 470, Operators Instruction Book

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4
Maintenance and adjustment
73
retighten the pipe.
5. Set the throttle fully open and ensure
that the fuel cut-off control is pushed
fully in, then turn the engine over with
the starter, until fuel, free of air,
comes from the pipe connections.
6. Retighten the injector unions.
7. The engine is then ready to start.
Fig. 22:
Fuel injectors (Fig. 23)
Service the fuel injectors every
1000 hours.
1. Clean the area around the injectors.
2. Remove the fuel leak-off pipe.
3. Disconnect the high pressure pipes
from the injectors.
4. Remove the injector flange setscrews
or nuts, remove the clamp (5) if fitted,
and withdraw the injector (2).
5. Remove the seat washer (3), dust seal
(4) and the spacer (1) and fit onto a
replacement injector.
Fig. 23:
3
2
1
4
5
6
6. Install the replacement injector. Where
the injector has a high pressure con-
nection on top, ensure that the fuel
leak-off connection (6) is not towards
the engine. Tighten the setscrews or
nuts to 16 Nm (12 lbf ft) ensuring that
the injector is straight.
7. Reconnect the leak-off pipe using new
washers either side of the banjo fit-
tings.
8. Reconnect the high pressure pipes, op-
erate the engine and check for leakage
of fuel.
AIR CLEANERS
Air pre-cleaner (Fig. 24)
Check the pre-cleaner (If fitted) -
Flexible maintenance
Fig. 24:
1
2
3
Check the pre-cleaner bowl and empty
out the dust if the level is near the ‘MAX’