Reply to "AF 312 armature shorts only in reverse."

RoyBoy posted:
Ukaflyer posted:

Sounds like the commutator face is touching the rear bush tubes.  Can't remember now but when going forward the armature is pushing forward but when going in reverse the armature pushes to the rear.

Nope. In the forward direction, the armature pushes towards the brushes. In reverse, the armature is drawn towards the gears/forward.

Thanks for confirming the way the armature moved, I just couldn't remember and wasn't in a position to go and look.

So this now seems that the stuck brush is still the problem if it hasn't been sorted. The armature pushing back in a forward direction is making contact OK and going in reverse is now pushing the armature forward and the brush is not making a full contact because it is partially stuck. A nice easy fix then.

The best thing I find for cleaning the tubes is to have the brush plate assembly removed and use a Q tip. The ones we have over here are slightly too large to get in the tube but if you just roll each end in your fingers a little bit to make it a tad smaller, then you can just push one end in and rotate as it goes through to clean all the oil and carbon off and then just follow it through so that the other end gives it a bit of a polish when that end goes through.

 



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