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Posted by Mark Rand on March 5, 2008, 7:34 am
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wrote:
> After much prodding, I've come
>to the conclusion that the cone pulley block is loose and at
>a certain point in a revolution it jumps from one position to another,
>so
>causing a knock when running at speed. There is a grub screw on the
>centre
>pulley, but adjusting that doesn't seem to make much difference.
>
>Is this a problem that anyone is familiar with?
>
>
Also check both the cone pulley and the driven pulley on the countershaft.
These have a habit of working loose over the years. You need to back off the
grub screw by a bit, feel for the centre of the looseness, then tighten the
grubscrew with the pulley in that position. As you get the screw further in,
rock the pulley back and forth to ensure that the screw is seated at the
lowest point on the shaft flat. If the pulley is a sloppy fit on the shaft due
to fretting in the past, it may be worth replacing the lot.
If the cone pulley on the mandrel were loose, it'd be because the pulley had
become separated from the bronze gear.
Mark Rand
RTFM
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>to the conclusion that the cone pulley block is loose and at
>a certain point in a revolution it jumps from one position to another,
>so
>causing a knock when running at speed. There is a grub screw on the
>centre
>pulley, but adjusting that doesn't seem to make much difference.
>
>Is this a problem that anyone is familiar with?
>
>