ENGINE REPAIR

---

5. The sliding gears and the sliding dog are moved back and forth by shifting forks. (see Figure 5).  There are three shifting forks in the transmission, two on the main shaft, and one on the lay shaft.  The shifting forks fit into machined grooves on the sliding gears and sliding dog.  The grooves allow the gear or dog to rotate while being held in place by the forks.  The shifting forks slide back and forth on the shifter shaft.
6. The shifting forks are actuated by the shifting drum (see Figure 6).  Each fork has a small round peg that fits into the grooves of the shift drum.  When the drum is rotated, the grooves move the forks back and forth on the shifter fork shaft, engaging the correct gears.  The drum is cut so only one fork moves at a time, and only one gear or shifting dog is engaged at a time. 7. The shifting drum has six depressions or dimples machined into its right end (see Figure 7), five large and one small.  These are called detent holes.

---

[previous page] [index] [next page]