Type U Drive Positioner

The Murray Type U drive positioner is a fixed idler bracket which provides support for a chain or belt. Like all Murray tensioners and positioners, it is constructed of structural steel. Available in a wide variety of sizes. Type U positioners can be mounted on any flat, vertical surface.

INSTALLATION SUGGESTIONS

  • Tensioning that is too tight causes excessive wear on chain, belt and bearings.
  • Tensioning that is too loose allows belt slip­page or chain vibration, causing loss of horsepower or wear.
  • Idlers should be located on the slack side of the drive chain or belt.
  • The use of idlers on the back of V-belts causes reverse bend, and can reduce belt life. However, when inside idlers are used, the arc of contact is reduced and allowance must be made for horsepower loss.
  • Chain idlers should be run on the outside of the chain.
  • Idler sprockets should have at least three teeth engaged with the chain.
  • Idlers, when used on the outside of the drive, should be located approximately 1/3 of the center distance from the small pulley or sprocket.
  • Idlers, when used on the inside of the drive, should be located approximately 1/3 of the center distance from the large pulley or sprocket.