Product Manual

M0112

• The standard pillow blocks on belt driven fans are factory lubricated. These

bearings should be lubricated on a semi annual basis (more frequently in severe

applications) using a high quality lithium based grease. With the unit running

add grease very slowly, using a manual grease gun, until a slight bead of grease

forms at the seal. Be careful not to unseat the seal by over lubricating or by

using excessive pressure. When the bearings are obstructed from view use no

more than three injections with a hand operated grease gun

• Dust and dirt on the exterior surface of the motor, fan panel and the entire fan

wheel should be removed, at intervals determined by the severity of the

application, to ensure proper service life and safety.

• For additional safety information refer to AMCA publication 410-96,Safety

Practices for Users and Installers of Industrial and Commercial Fans

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.