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Fan belt check and adjustment
1. Fan sheave
2. Belt
3. Motor sheave
4. 10 mm/m deflection = proper belt tension
5. Straight edge
Belt profile
B
New belts have to be re-tensioned after 24 hours operation.
If belt tensioning is required, please proceed as follows:
1. Loosen the lock nuts on the motor base adjusting screws.
2. Turn the motor base adjusting screws clockwise to tension the belt, or counter-clockwise to relieve belt
tension. During adjustment of belt tension the drives should be rotated several times by hand to evenly
distribute the tension throughout the belt.
3. When the belt is properly tensioned, re-tighten the locking nuts on the motor base adjusting screws.
There should be no "chirp" or "squeal" when the fan motor is started.
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W W W . B A L T I M O R E A I R C O I L . E U
CAUTION
Over-tensioning of belts can lead to component damage.
Diameter (mm)
motor sheave
100 through 118
125 through 140
150 through 170
>180
Belt tension forces
Deflection force (kg)
Min.
Max.
1.5
2.0
1.5
2.5
2.0
2.5
2.5
3.0
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