Facebook Twitter LinkedIn YouTube Menu Search Arrow Right Arrow Left Arrow Down Arrow Up Home Arrow Next Arrow Previous RSS Icon Calendar Icon Warning Icon

Filter the results

  • Enter one or more words to find resources containing any of the words entered
  • Enter words or phrases between " " to find exact match

Resource categories

Resource Library

Getting the most from your call to EASA Technical Support

  • February 2017
  • Number of views: 1183
  • Article rating: No rating

 The purpose of this article is to provide the information you need to get the most effective and useful information from EASA’s Technical Support Department. This in turn helps you serve your customers quickly and efficiently. 

Solve vertical pump motor vibration

Knowledge of common vibratory forces helps diagnose and correct problems

  • February 2017
  • Number of views: 4920
  • Article rating: No rating
Trade press article — Processing Magazine

High vibration is a common problem for motors that are installed on top of vertical pumps. Its source can be a mechanical issue with the pump, motor or coupling or even hydraulic forces from the pump.

Power to the pump

  • August 2016
  • Number of views: 2870
  • Article rating: No rating
Trade press article — Electrical Construction & Maintenance

An important step when selecting a centrifugal pump and an electric motor for an application or when troubleshooting operation issues is to determine how much power the pump should be using.

Mechanical repairs play a key role in motor repair and reliability

EASA AR100 details steps to take to clean, repair, and test equipment

  • November 2015
  • Number of views: 2890
  • Article rating: No rating
Trade press article — Plant Engineering

In a previous article in Plant Engineering ("A systematic approach to AC motor repair," Plant Engineering, April 2015), EASA highlighted the good practices for electrical repair found in ANSI/EASA Standard AR100 Recommended Practice for the Repair of Rotating Electrical Apparatus, and the significant impact they can have on motor efficiency and reliability. But that was only part of the story, because mechanical repairs—and even documentation, cleaning, and inspection—can also markedly affect motor reliability and efficiency.

On-site troubleshooting of eddy current press drives

Questions to ask in order to avoid unnecessary removal of large device

  • February 2011
  • Number of views: 1607
  • Article rating: 4.0


This article provides a look at one service centers work at troubleshooting drive units on stamping presses. Topics covered include:

  • On-site tests
  • Fact finding
  • Effects of contamination
  • Verifying DC portion of eddy current drive
  • Tachometer signal
  • The job performed by the press

Pinning down possibilities for pump problems

Troubleshooting should start by looking at the pump, the fluid and the system

  • January 2011
  • Number of views: 1150
  • Article rating: No rating

When a motor fails to perform, we know what to check: the voltage, whether it's balanced, the current, whether there is a ground, etc. When a pump fails to perform, many service centers are at a loss on how to troubleshoot it. If the pump has just been repaired and fails to perform, it will be hard to convince the customer that the pump is not the problem. The fact is, there are three areas of possibilities: It could be the pump, or it could be the fluid that is being pumped (the pumpage), or it could be the system of vessels, pipe and fittings connected to the pump (the system). Understanding a little bit about pump curves and pump performance parameters, and using the process of elimination, will allow the service center technician to narrow the possibilities - especially those that are pump related.

What does it mean when a rewound motor runs "hot"? Items to check to make sure it's operating properly

  • July 2008
  • Number of views: 1157
  • Article rating: No rating

Has this ever happened to you? You have rewound a motor without changing the design at all; you tested the motor before you sent it out, and everything appeared to be fine. But now your customer wants you to figure out what is wrong, or rewind the motor again. Before you consider this, there are a few things to check to see if the motor is, in fact, running properly. It is quite possible that the motor ran "hot" before it failed, but what are the chances that someone on-site put their hand to the frame before it had to be rewound?

DC generator woes: Why won't it generate?

  • October 2006
  • Number of views: 1205
  • Article rating: No rating

There are a number of different types of DC generators: shunt, series and compound, each of which can be separately or self-excited. A DC generator is built and designed exactly the same as a DC motor,and can be run as such. Regardless of the type, there are a number of reasons why a generator won't produce the correct voltage, or any voltage at all.

Understanding factors that cause shaft failures

  • March 2004
  • Number of views: 1420
  • Article rating: 5.0

Shaft failures are not an everyday occurrence, but when they come in, it can be an interesting challenge to determine the cause of failure. Regardless of what caused the shaft to fail, what actually happens when it bends or breaks? To understand shafts and why they fail, you need to understand the relationship between stress and strain for steel.

Troubleshooting tips for armature rewinds

  • April 2003
  • Number of views: 1877
  • Article rating: 5.0

When an armature is rewound, there is always a slim chance that it may be connected incorrectly. If two coil leads are switched, or if the error results in an armature where each coil closes on itself, normal tests will detect the problem. The trouble arises when the misconnection results in a uniform winding. When that happens, the result may be—in effect—an accidental redesign for a different voltage.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.


ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.



EASA Technical Manual

EASA Technical Manual cover

Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.