INSTALLATION SUGGESTIONS

To complement the line of tensioners and positioners. Murray stocks a range of idlers for chain and belt drives. Special sizes and configurations can be furnished upon request. All idlers are fitted with shell needle bearings. Bronze bushings are available upon request.

  • Tensioning that is too tight causes excessive wear on chain, belt and bearings.
  • Tensioning that is too loose allows belt slipĀ­page 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.