3.1 General description
The front axle consists of the main reduction gear, the differential, the final reduction
gear and brakes. (see Fig. 3.1) The front axle is bolted to the front side of the frame.
The mast is installed on the axle housing.
3.2 Main reduction gear & differential
The main reduction gear & differential consists primarily of a cross case, ring gear
(spiral bevel pinion) and drive pinions, which are all assembled on the main reduction
gear carrier as shown in Fig. 3.2, and is fitted to the axle housing through packing.
3.3 Final reduction gear
The final reduction gear is of the planet gear type consisting of a sun gear, planetary
gears and an internal gear. Two final reduction gears are installed on each end of the
axle housing. The sun gear is splined to the axle shaft and locked with snap ring. The
planetary gears are installed onto the shafts in the planet carrier which is fixed to the
wheel hub. The internal gear is splined to the axle spindle through hub.
The principle of power transmission is as follows (see Fig. 3.3).
When the sun gear turns, the rotation is transmitted to the pinion gears and ring gear.
However, since the ring gear is fixed to the spindle, the pinion gears revolve around the
sun gear while spinning themselves. The pinion gears are installed to the carrier which
is fixed to the wheel hub, therefore, power of the drive shaft causes the wheel to turn.
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