XB, HV, HVA, HVAR, ADD, ADDR, DDS, DDP, SXB, SADD
M0112_NOV 2020
Page 4 of 8
www.CANARM.COM
Canarm Ltd. - Corporate Head Office
2157 Parkedale Avenue, PO Box 367 Brockville, Ontario Canada K6V 5V6
Tel: (613) 342-5424 Fax: (613) 342-8437
www
.canarm.com
Belt Tension
BELT AND PULLEY REPLACEMENT
In the course of regular maintenance the belts and pulleys may have to be changed and or adjusted the
recommended procedure is as follows.
• Do not change the pulley pitch diameter in order to tension the belts. This will result in a change in the fan speed.
• Loosen the nuts on the motor plate or motor in order to reduce the belt tension such that the belts will easily slip
over the pulleys. Never force the belts over the rim of the pulley.
• Loosen the setscrews on the pulleys and remove from either the motor or fan shaft using a two or three jaw
puller.
• Remove any shaft imperfection such as setscrew mark using a file or emery cloth.
• Install the replacement pulleys tightening all setscrews to the recommended torque rating (see chart) and
ensuring that they are properly aligned.
• Pulley alignment is achieved by moving the pulleys on their respective shafts or moving the entire motor until
the pulleys are correctly aligned (see figure). Using a square with one edge parallel to the motor shaft adjust the
pulleys until the other edge is parallel to the belts.
• Slip the belts over the pulleys then adjust the motor/ motor plate until the proper tension is reached (1/64”
deflection, half way between pulley centers, per inch of belt span when pressed firmly).
• Tighten the motor plate/ motor adjusting nuts in place.
PULLEY ALIGNMENT
INCORRECT
CORRECT
INCORRECT
INCORRECT
