5. The 2nd and 4th gear on the main shaft, and 3rd gear on the layshaft are held in place by lock rings which fit into grooves cut in their shafts. These lock rings can usually be moved by rotating them around the shaft. However, if any lock ring can be moved up and down far enough that one of its edges comes close to being out of its groove, or if it has an unusual amount of side play, replace that ring.

6. Closely inspect each shifting fork for wear. The forks each have two thrust pads on their extreme ends. These pads are the only part of the fork that should make contact with the groove in the sliding gear or dog. If a gouge or a wear mark appears on any other part of the forked end, that is a sign that the fork is either bent, or has been subjected to an unusually strong side loading force. In either case, replace that fork. Closely inspect the shifter fork shaft for wear. Slide each fork back and forth along the entire length of the shaft several times to insure that they are not binding.

7. With a vernier caliper, or 0 to 1 inch micrometer, measure each thrust pad on all three shifter forks (Fig. 39). They should all measure no less than .148". If any of them measures less than this, replace that fork.

FIG. 39

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