Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 97
On the engine, the gear drive is located at the rear end of the
engine.
Important components like the injection pump and valve mech-
anism require precise operation and are therefore attached
to the rear end of the crankshaft, close to the flywheel, where
crankshaft rotation is smoothest.
The gear on the crankshaft drives two intermediate gears and
the oil pump gear.
One of the intermediate gears drives the camshaft. The cam-
shaft gear in its turn drives the injection pump gear.
The other intermediate gear meshes with the gear for the air
compressor
1. Oil pump gear
2. Air compressor gear
3. Crankshaft gear
4. Intermediate gear
5. Injection pump gear
6. Camshaft gear
Timing gears
Gear drive
The camshaft and injection pump rotate at half the speed of the
crankshaft.
To facilitate correct assembly of the timing gears, the gears are
marked on a tooth or in the space between two teeth.
The injection pump gear has an oval hole for setting the injec-
tion timing (the a angle).
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