This action brings the two gears to the same speed and stops endwise travel of the sliding gear. The sliding sleeve slides over the balls and silently engages the external teeth on the main drive gear. When the transmission control lever is shifted to the second-speed position, the sliding gear and sleeve move rearward. The same action takes place, locking the transmission main shaft to the second-speed main shaft gear. The snchromesh clutch is not applied to first speed or to reverse.
First speed is engaged by an ordinary dog clutch when constant mesh is employed by a sliding gear.
The positions for the various speeds are the same as those for the vertical control lever except that the lever is horizontal. The shifter fork is pivoted on bell cranks that are turned by a steering column control lever through the linkage shown. The poppets shown in figure 13-10 engage notches at the inner end of each bell crank. Other types of synchromesh transmissions controlled by steering column levers have shifter shafts and forks moved by a linkage similar to those used with a vertical control lever. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site.