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  1. tobyS

    sprag/overrun testing

    I think you would have to block up all wheels so the back can turn free to see if the front is engaging. Or some mud, which comes with the risk of having to be pulled out since making the rear turn and not move the truck is the goal (to see if front is engaging).
  2. tobyS

    sprag/overrun testing

    Under normal operation there is no noise at all. The inner part rotating is an egg shaped cam that wedges an inner drum and an outer drum with change of direction. The back gear in the TC turns 17 rpm while the front does16. As soon as the back turns free, the cams lock and drive the front...
  3. tobyS

    sprag/overrun testing

    The rear turns 17 rpm for every 16 that the front turns on the 809 series. The sprag is a one way clutch meaning that in one direction it is locked with a cam motion but in the other direction it allows the inner drum to spin one way. The back, while in forward motion, is always trying to...
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