1. Fuel tank
2. Water trap (not 8200/8400, 8750 and
8950)
3. Fuel feed pump
4. Fuel filter (+ water trap, 8200/8400, 8750,
8950: double filter with water traps)
5. Fuel injection pump
6. Injector
7. Thermostart fuel reservoir (not 8200/8400,
8750, 8950)
8. Glow plug
9. Overflow valve
88
Model Code Page
22. Fuel system
1. 6. 1999
6000--8750
220 4
1. 1. 1994
1
2
3
4
5
6
7
8
9
Fuel system, description
Fuel feed pump (3) draws fuel from tank (1) through water
trap (2) (not 8200, 8400, 8750, 8950) and forces it through
filter (4) to fuel injection pump (5). The fuel injection pump
pumps fuel at high pressure through the delivery pipes to
injectors (6) which inject the fuel in the form of a fine mist
into the combustion chamber.
Excess fuel lubricates the nozzle valve (needle) and flows in
return through the thermostart device reservoir (7) (not
8200/8400, 8750, 8950) and then on to the fuel tank. When
the t hermostart is on (glowing) fuel runs from reservoir (7)
through glow plug (8) and is ignited in the induction mani-
fold. Excess fuel returns from the fuel injection pump
through overflow valve (9 ) to the fuel tank.
Important! 8200/8400, 8750, 8950 has not the Thermostart
fuel reservoir but fuel flows from the injectors to the injec-
tion pump overflow valve from where a pipe goes to the
glow plug. 8200/8400, 8750 and 8950 tractors have a com-
bined fuel filte r and water trap.
Maintenance
Fuel filter:
--- Change the fuel filter at intervals of 100 running hours or
yearly.
Water trap:
--- Empty/clean the water trap at every 500 running hours.
Fuel tank:
--- Empty/clean the fuel tank at every 1000 running ho urs or
yearly.
Injectors
--- Reconditio ning of the injector should be carried out by
an authorised workshop.
Symptoms of dirty or faulty injectors are:
--- Knocking is an indication that one of the injectors is
faulty. When a cold engine ticks over a certain amount of
knocking is unavoidable. If the engine knocks after it has
reached normal o per ating temperature, it is very likely that
one of the injectors is faulty. Air in the fuel system can also
cause knocking (whic h should disappear after the system
has been bled o f air).
--- Sm oky exhaust gases may indicate impaired perform-
ance of the injectors. However, this can also be caused by
other faults such as a blocked air cleaner.
The fuel system should always be bled when the fuel sys-
tem has been emptied (e.g. the fuel tank has been emptied
during driving, in connect ion with maintenance or repair
work or after a long idle period).
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