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22. Fuel system
L. Adjusting injection timing on
6800, 8750 and 8950 tractors
Important! Adjusting fuel injection timing on 6800, 8750 and
8950 tractors and later on all tractors which have Bosch in ---
line pump (G4720 --- (320), G2358 --- (420) and G5294 --- (620,
634), the injection timing is adjusted according to this instruc-
tion.
Note! On these tractors the injection starting point in the 1st
cylinder has been positioned with aid of an indicator pin in the
pump governor housing.
1. Turn the crankshaft to a position where the 1st cylinder pis-
ton reaches its compression stroke top dead centre. Then turn
the crankshaft backwards until the timing mark on the fly-
wheel is at the point of locator 9025 99100.
2. Unscrew the plug on the side of the injection pump. Take
out the indicator pin.
3. Turn the indicator pin and push it into the hole so that the
groove at the end of the pin points towards the pump.
4. If the pin groove fits on the boss on the governor weight
assembly, the injection timing is correct. Otherwise, turn the
pump to a position where the boss and the pin groove align.
Warning! Do not rotate the crankshaft when the groove end
of the pin is inside the pump, since the pin end damages eas-
ily and metal pieces remain in the governor housing.
5. When the adjustment is correct, turn the indicator pin so that
the groove points outwards (running position) and push the
pin into the hole. Refit the plug.
Note! When checking the injection timing, an electric testing
device can also be used, e.g. Bosch KDEP 1601 according
to the instruction manual of the device.
9025 99100
116
Model
1. 8. 1998
6800, 8750
1. 6. 1999
8950
Code
Page
223
8
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