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Synthetic lubricants for use in rolling element bearings

  • November 2017
  • Number of views: 5205
  • Article rating: No rating

My first exposure to synthetic lubricants for rolling element bearings was during repair of high-speed, automotive engine-test dynamometers. For several years, our service center had repaired similar machines with rolling element bearings, but they were all oil lubricated by pump systems with specially-selected fittings near the bearings to deliver only small amounts of oil per minute.

We began to see rolling-element-bearing machines in for repair that were grease lubricated, and these displayed a specific make and type of lubricant on the nameplate. We purchased what was specified on the nameplate and all was well. Over time, we began to see more machines specifying the same make of grease, but a different grade or type. This led me to begin looking into the differences in the products.

Lubricantes sintéticos para rodamientos con elementos rodantes

  • November 2017
  • Number of views: 4962
  • Article rating: No rating

Mi primera experiencia con lubricantes sintéticos para rodamientos con elementos rodantes fue durante la reparación de dinamómetros para probar motores de automóviles de alta velocidad. Durante varios años nuestro centro de servicio había reparado máquinas similares con rodamientos con elementos rodantes, pero todas ellas estaban lubricadas con sistemas de bombeo de aceite con accesorios especiales cerca de los rodamientos para suministrar solo pequeñas cantidades de aceite por minuto.

Comenzamos a ver máquinas enviadas para reparación con rodamientos con elementos rodantes lubricadas con grasa y estas indicaban en la placa de datos una marca y tipo de lubricante específicos. Compramos lo que estaba especificado en la placa y todo salió bien. Con el tiempo, comenzamos a ver más máquinas que especificaban la misma marca de grasa, pero con un tipo o grado diferente y esto me condujo a comenzar a buscar las diferencias en los productos, ya que uno era muy costoso y tenía una vida útil limitada.

Variety of oil leaks and repair options explained

  • July 2016
  • Number of views: 3659
  • Article rating: No rating

In oil-lubricated machines, leaks are a frequent and difficult-to-diagnose and correct condition. Due to design issues, there may even be a few machines where oil leaks are simply part of the landscape and not correctable without major modifications. Topics discussed in this article include:

  • Overfilling
  • Checking/replacing sight glasses
  • Proper venting of labyrinth seals
  • Checking/repairing stand tubes (stand pipes)
  • Proper sealing
  • Examining condition of oil sumps
  • Draining oil before transporting
  • Oil foaming
  • Checking vibration levels
  • Checking to see if motor is running off electrical center

Variedad de fugas de aceite y explicación de las opciones de reparación

  • July 2016
  • Number of views: 3609
  • Article rating: No rating

En las máquinas lubricadas con aceite, las fugas son una condición frecuente y difícil de diagnosticar y de solucionar. Debido a problemas de diseño, incluso pueden existir unas pocas máquinas en las cuales las fugas de aceite simplemente forman parte del paisaje y no se pueden corregir sin realizar grandes modificaciones.

Los temas tratados incluyen :

Llenado excesivo de aceite
Verificación/reemplazo de los visores de aceite
Ventilación adecuada de los sellos de laberinto
Verificación/reparación de los tubos de presión (stand-pipes)
Sellado apropiado
Verificación del estado de los depósitos de aceite
Drenaje del aceite antes del transporte
Formación de espuma en el aceite
Comprobación de los niveles de vibración
Verificación para ver si el motor está trabajando fuera de su centro magnético

Value-added Repair and Service Opportunities for Optimizing Motor Reliability

  • June 2012
  • Number of views: 3005
  • Article rating: No rating
Convention presentation

This paper covers value-added repair and service opportunities that carry with them the added benefit of helping to optimize motor reliability.

Start with cause of oil leaks in repair process on sleeve bearing motors

  • July 2000
  • Number of views: 6395
  • Article rating: 4.5

Have you ever repaired a sleeve bearing motor, only to have the customer complain that it leaks oil? Perhaps the motor had a history of oil leaks, and the windings were oil-saturated when you dismantled it. Two-pole machines are especially notorious as chronic oil leakers. The first step toward correcting an oil leak is to identify the cause. 

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.