Belt Tension - Kruger BNA General Instructions Manual

 Aligning sheaves

BELT TENSION

Proper belt tension is important for long belt life. Too much tension puts excessive loads on the belts and
the bearings, reducing the lives of both components. Not enough tension allows belt slippage, which
generates heat and drastically reduces the life of the belt.
Belt tensioning gauges can be used to determine whether the belts are tensioned properly. A chart that
comes with the gauge specifies a range of force required to deflect the belts a given amount based on the
centre distance of the sheaves and the belt cross section. The belts are properly tensioned when the force
required to deflect the belt, the specified amount falls within this range.
If a belt tensioning gauge is not available, re-tension the belts just tight enough so that they do not squeal
when starting the fan. A short "chirp" is acceptable; a squeal lasting several seconds or longer is not
acceptable.
Before starting the fan after tensioning the belts, recheck the alignment and realign the sheaves if necessary.
New belts may stretch a little at first, so recheck belt tension after a few days of operation.
.
with a straight edge
Proper Offset
Belt tension indicator
applied to mid-centre
distance.
7
Pigeon- Toed Angle