This manual covers horizontal and vertical squirrel-cage induction motors in the 300 to 5,000 horsepower range, low- and medium-voltage. Most of the principles covered apply to other sizes as well. This manual focuses primarily on IEC motors and standards.

Two common scenarios that service centers deal with regarding belt drive applications are failure of a motor drive end ball bearing or breakage of the shaft at the drive end bearing shoulder. The cause of these failures often is over-tensioning of the v-belts. However, there are many other faults or undesirable practices that can lead to premature bearing failure, belt wear and sheave wear.  Due to practical space limitations, this article isn't exhaustive in its coverage but deals with common scenarios other than motor bearing failure and shaft breakage.

Over-tensioning of belts can lead to shortened life for not only the belts, but also the sheaves and bearings of the motor and driven equipment. In some cases excess belt tension can result in motor shaft breakage. This technical article examines the proper installation and tensioning of V-belts.

This 94-page handbook (3.5" x 6", 9cm x 15cm) contains carefully selected materials designed to assist repair firms in their everyday work. Just as important, your customers and potential customers can use this pocket handbook as a handy reference for mechanical data for motors and driven equipment.

This presentation focuses on:

• Identifying belt vibrartion
• Identifying pulley pitch line run-out vibration
• Other vibration sources
• ODS analysis

Electric motor repair report form to collect basic motor, bearing, shaft, and coupling information.