If the Speed Control Handle is being forced to turn as it becomes harder to turn, it can bend the worm gear shaft. I find about 1/4 of the Speed Control Assemblies with damaged teeth will also have a bent worm gear shaft.JPG40504 wrote:There is one caveat, and that is whether the worm gear shaft is bent. As far as the sudden binding near the end of its range, that may not be due to a bent shaft. The increasing mis-alignment at the near-end position causes an increasingly binding interference(mashed teeth).
In any event the parts needed are inexpensive and well worth the effort!
I have rebuilt assemblies or offer rebuilding services for the Speed Control Assembliy. Many times, the Control Sheave bearing, button and/or retaining loop will need replacing which I have available.
Contact me for a free allen head bolt, star washers and nylock nut along with instructions if you want to change the roll pin yourself. Just need your address. Thanks.
Bill