Chain slack should be 4% of the span. Slack should be measured halfway between the span.

For Example: 25” of span = 1” of slack (25" x 0.04 = 1).

 

For heavy loads and frequent starting, it should be 2% of the span.

For example: 25" of span = 0.5” of slack (25" x 0.02 = 0.5").

 

Span is defined as the distance between the drive pulley/sprocket (usually at the motor) and the driven pulley/sprocket (usually at the shaft that is being driven).

 

Chains with Jack Bolt Tensioner:

Loosen the locking bolts and turn the jack bolt until you have proper tension. Retighten the locking bolts!

 

 

Chains with Sprocket Tensioner

Loosen the locking bolts and adjust sprocket (move up or down) until you have proper tension. Retighten the locking bolts!