7. 3rd Gear. The gearshift is lifted again to shift from 2nd to 3rd
gear. When the selector shaft rotates, the shifter pawl moves upward, turning
the shifting drum clockwise, looking at the left end of the drum. Gear
C withdraws to the right, disengaging from gear B and returning to a neutral
position. Gear 1 then moves to the right, engaging gear H. The transmission
is now in 3rd gear as shown in Fig. 35. The power flows to gear C, which
is locked to the mainshaft. Its opposing gear, H, is not locked to the
layshaft, but gear 1, into which it is engaged, is locked to the shaft.
Therefore, the power is transmitted to the layshaft, making it and gear
F turn. Gear F then drives gear E, causing the drive sprocket to rotate.
To calculate the 3rd gear ratio, divide the number of teeth on gear H by
the number on gear C. Divide the number of teeth on gear E by the number
on F. Multiply the two answers together to obtain the ratio of 3rd gear.
FIG. 35
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