Combines rotor speed adjuster

Does it only jam when you go all the way to the slow speed and try to go up or it doesn't matter where it is when you try to move it. Try to keep the threads clean on the adjuster and don't use any type of grease or lubricant on them. Use a wire brush to keep them clean. Check to make sure that the limiter switches work and are adjusted properly by checking the rotor speeds upper and lower and that they are within the books specs.

Is it stopping every time the gear makes one revolutionIJ Ours was doing that, and it was a broken cog on the little electric motor. We had to take the assembly apart and shim it so that the gears meshed on good areas of the gears.