I suspect that just about everyone in our industry at one time or another has had the joy of repairing a “purpose-built” motor. This kind of motor is built for a specific purpose and has characteristics that may allow it to operate under non-standard conditions. Due to the limited information that some of them display on the nameplate, the repair of these motors can be somewhat of a challenge. Sometimes these motors possess differences such as the color of paint, the shaft size, the bearing size, or type. It can be the operating temperature and at times it can be the motor in its entirety. Following are a few useful tips we use when repairing a motor with so many question marks.

Shows step-by-step disassembly of a TEFC motor with the proper tools to use, how to mark parts for proper reassembly, how to remove ball bearings from shaft. Details things not to do. Does not include stripping.

Shows step-by-step disassembly of a DC motor and the tools to use. Demonstrates how to mark parts, and how to label and record connections for use in assembly. Also explains how to check for shorts or opens in field and armature windings, how to test run the motor, and how to inspect parts for damage and wear.