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Adjusting End Play on Vertical Pump Motors

  • January 2024
  • Number of views: 2439
  • Article rating: No rating

This video walks through the steps to adjust and set end play on a typical vertical hollow shaft pump motor.

The Pump Repair Option for Service Centers

  • February 2020
  • Number of views: 5183
  • Article rating: 1.3

EASA service centers looking for options for expansion, or to replace evaporating existing electric motor repair markets, have seen pump repair as a good fit. A majority of EASA service centers currently repair roto-dynamic pumps. Pumps are by far the largest category of machines driven by electric motors. If a service center is repairing electric motors, then it is almost certain that some of those motors are driving pumps, and the prospects for pump repair are its existing customers.

La Opción para la Reparación de Bombas en los Centros de Servicio

  • February 2020
  • Number of views: 5176
  • Article rating: 5.0

Los centros de servicio miembros de EASA que buscan expandirse o que estén interesados en reemplazar los mercados de reparación volátiles existentes, han visto en la reparación de las bombas algo idóneo. Por lo general, la mayoría de los mismos repara bombas roto-dinámicas. Por mucho, las bombas son la categoría más grande de máquinas accionadas por motores eléctricos.

Solve vertical pump motor vibration

Knowledge of common vibratory forces helps diagnose and correct problems

  • February 2017
  • Number of views: 14301
  • 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.

More on vertical bearing applications and configurations

  • June 2016
  • Number of views: 5711
  • Article rating: No rating

 Vertical motors can be identified by their capacity for an external thrust load. One common application with this factor is vertical pumps. The thrust load applied is the sum of the weight of the pump line shaft, the column of water in the casing that is being lifted, the weight of the pump impeller and the thrust produced by the pump’s volutes which forces the water to move upward. The distance between the motor and the impeller can be very short such as pumping from a tank at or above ground level to lifting water from a subsurface aquifer several hundred feet deep. In the latter example, the combined weight of the thrust load can be thousands of pounds (kilograms). The motor must then have a bearing design capable of these loads utilizing thrust bearings. 

Más sobre rodamientos en aplicaciones y consideraciones verticales

  • June 2016
  • Number of views: 8548
  • Article rating: 2.0

Los motores verticales se pueden identificar por la capacidad de soportar cargas de empuje externas. Una aplicación común en la que encontramos este factor son las bombas verticales. La carga de empuje aplicada es la suma del peso del eje lineal intermedio de la bomba (line shaft), la columna de agua que se está levantando, el peso del impulsor de la bomba y el empuje producido por las volutas de la bomba que fuerzan el agua hacia arriba. La distancia entre el motor y el impulsor puede ser muy corta, tal como sucede al bombear agua desde un acuífero subterráneo que se encuentra a cientos de pies de profundidad, hasta un tanque situado por encima o por debajo del suelo. En este último ejemplo, el peso combinado de la carga de empuje puede ser de miles de libras (kilogramos). El motor deberá estar diseñado con un rodamiento capaz de soportar estas cargas, por lo que se utilizan rodamientos de empuje. 

Guidelines for vertical pump removal and installation

  • February 2015
  • Number of views: 8656
  • Article rating: 5.0

Service centers that provide field service for equipment removal and installation have little trouble handling most common horizontal pumps. However, vertical turbine pumps (and similarly mounted vertical pumps) present some additional challenges.

Vibration problems with motors installed on vertical pumps

Knowledge of common vibratory forces helps diagnose, correct problems

  • February 2010
  • Number of views: 9820
  • Article rating: 4.0

When motors are installed on top of vertical pumps, high vibration is a common problem. The source of the problem can be a mechanical issue with the pump, motor or coupling, or it can be hydraulic forces from the pump. Often structural issues involving resonance amplify the vibration. An understanding of the nature of this style pump and the various forces is essential to diagnosing and correcting vibration problems on vertical pump motors.

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 September 2022
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.