The idler shaft carries a cluster of gears of different sizes .The cluster is mounted in the roller bearings on an axle or, together with the shaft, on bearings in the housing wall bores .The idler shaft constantly rotates with the input shaft because their gears are in constant mesh. The reverse gear(a single gear or a two-gear cluster)rotates on an axle secured in the holes of the housing walls.
The gear shift mechanism is designed for engaging gears, setting them neutral and engaging the reverse speed. The speeds are changed by shifting the gears or sleeves along the output shaft. The transmission type depends on the number of the sliding gears or sleeves. The transmission with two sliding gears or synchronizer sleeves is called two-range, with three gears, threer-ange. Depending on the number of number of forward speeds there are three-,four- and five-speed transmissions. The gear shift mechanism is mounted on the top cover the shift lever is arranged on the cover or on the bracket of the lever support.
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