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Operation (See Fig. 2)
In 1st-speed, lst/2nd speed synchronizer sleeve is moved rearward by the shift fork. The sleeve engages the 1st-speed blocking ring which acts as a cone clutch applied to the free-wheeling 1st-speed gear. This action speeds up or slows down the 1st-speed gear to match the speed of the output shaft. Further movement of the sleeve locks the lst/2nd speed synchronizer hub to the 1st-speed gear by means of internal splines.
On engagement of the clutch, power flows through the input shaft and gear to the meshed countershaft gear and thence to the 1st-speed gear. This gear transmits the power through the locked synchronizer hub to the output shaft.
All the other forward-speed gears are in idler motion, as they are all driven by the countershaft (cluster) gear, but they do not transmit power as they are not locked to
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the output shaft. All the forward-speed shifts are made in the same manner as the 1st-speed shift, due to the constant mesh features.
Reverse gear is engaged by moving the reverse sliding gear forward on the reverse idler gear until it meshes with the external teeth (spur type) of the lst/2nd speed synchronizer sleeve. Movement of the sliding gear is accomplished by the shift lever. With all the forward-speed synchronizer sleeves in neutral, power-flow in reverse is through the input shaft to the constant-mesh countershaft (cluster) gear, thence to the constant mesh reverse Idler. Splines then carry the power through the reverse sliding gear to the lst/2nd speed synchronizer sleeve which is locked to the output shaft. As the reverse sliding gear is meshed with the synchronizer sleeve, power is transmitted to the output shaft, rotating It In a reverse direction.
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