Darn right, it sounds familiar! I had to tighten the belt so tight that I
feared shearing it off. I think I understand the problem. See if you
agree.... The belt I used is a NAPA cross number, as listed on one of the M35
pages. It is too short. Being too short, the pulley halves have to be screwed
apart very far. This does two things. First, the clamping action doesn't work
very well. The metal distortion due to tightening the bolts doesn't grab
against the hub part. Second, the belt is orbiting so close in to the axis
that only a portion of the belt is actually catching on the pulley faces.
Check to see if you see uniform coloring on the sides of the belt. I bet you
won't. Part of my belt dangles down between the pulley faces. It squeals.
Are you using a military belt or a cross referenced belt? Jim
"Mark J. Blair" wrote:
> Hi, folks. The air compressor pulley on one of my M109A3 2.5-ton shop
> vans keeps loosening up, even though I tighten the two clamping bolts
> about as far as I dare without stripping them.
>
> In case you're not familiar with these compressors, their pulleys are
> made from two cone-shaped halves, and the belt tension is adjusted by
> turning one half with respect to the other, thus changing the
> effective diameter of the pulley. There is a pair of bolts which clamp
> the front half in place with respect to the back half, but my pulley
> keeps slipping out of adjustment despite those two bolts. Just driving
> a few miles allows the pulley to slip enough that the truck can no
> longer build air pressure. I've tried removing the two bolts, cleaning
> them, replacing the lockwashers, and applying some anti-sieze to
> prevent them from binding up before I've tightened them fully.
>
> Before I start tearing everything apart, does this symptom sound
> familiar to anybody?
>
> Thanks in advance!
>
> --
> Mark J. Blair, KE6MYK <mblair1@home.net>
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This archive was generated by hypermail 2b29 : Fri Dec 07 2001 - 00:36:59 PST