Gearshift Mechanism

Three shift fork shafts are used: 1-2, 5-R and SL. The 1-2 shift fork shaft is fixed in position; both the 5-R and SL shift fork shafts are moveable. The 3-4 shift fork moves along the 5-R shift fork shaft.




SL (Super Low)
A spring loaded steel ball engages a detent in the end of the shaft to hold the fork in position.
When SL is selected, super low shift piece A, located on the 1-2 shift fork shaft, shifts the super low shift lever, causing the super low shift fork to engage super low gear.




(1st-2nd)
When 1st or 2nd is selected, the 1-2 shift fork is moved along the 1-2 shift fork shaft, which causes the counter reverse gear to engage the gear selected.
A spring loaded steel ball on the 1-2 shift fork engages a detent in the fork in shaft to hold the shift fork in position.




(3rd-4th)
When the transmission is placed in 3rd or 4th, the 3-4 shift fork is moved along the 5-R shift fork shaft so as to move the 3-4 synchronizer sleeve into the appropriate gear.
A spring-loaded steel ball in the 3-4 shift fork and detent formed in the 1-2 shift fork shaft hold the 3-4 shift fork in position.




(5th)
As the transmission is shifted into 5th, the 5-R shift piece is moved together with the 5-R shift fork shaft. The end of the 5-R shift fork shaft also pushes on the 5th shift fork.
Since the 5th shift fork engages the 5th synchronizer sleeve, the movement causes the transmission to shift into 5th gear.
The pin on the 5-R shift piece just moves in the reverse shift fork groove; that is, the reverse gear remains stationary.




(Reverse)
When reverse is selected, the 5-R shift fork shaft is moved, independent of the 5th shift fork, causing the reverse selector pin to move the reverse shift fork to engage reverse gear.