NJP Dec backlash

Hi,

I realize that my NJP has terribly bad Dec backlash. It wasn't like this before. Does anybody know how to adjust it?

Thanks.

Wei-Hao

Hi Wei

It might be one of these.

1)Motor to gear mesh; use a piece of doubled cigarette paper as a spacer between the gears and readjust the motor position

2)The worm bearing races have backed out allowing the worm gear to shift; The large chrome nuts on either side of the worm gear. One is an adjustment the other is the lock. If this does not make sense go to a bike shop and ask to see a high end mountain bike crank bearing set. It is not to hard to see if this is the problem; the shaft for the worm will move in or out when you move the DEC axis manually or if you push/pull the worm shaft the gear will move DEC axis. These movements are very small and equal your backlash.

3)The entire worm assembly has moved and the gap between it and the main gear has changed. This will require a rather large post and some pics.

Whatever you do tighten things half as much as you think first and then triple check it before tightening again. Butterer smoothness is what you want to feel when you turn anything. If it feels like there is sand or its hard to turn; its too tight. I set them so there is no backlash and you can turn the worm by the shaft without a gear with your fingers.

If you are not comfortable with these adjustments send your mount to TNR or bring it to a dealer. Over tightening the worm to main gear can cause a really bad thing to happen to your mount.