Pump Motor Alignment – What You Need to Know

A pump motor alignment is a crucial part of any wastewater treatment system. It ensures that your pump is operating at peak efficiency, saving you money and increasing the lifespan of your equipment. But how do you know if your pump needs to be aligned? And what exactly does it mean to align a pump motor? In this article, we’ll answer those questions and more.

What Is a Pump Motor Alignment?

Pump motor alignment is the process of making sure that all of the components in your pump are working together properly. If your pump is not aligned, it will not work properly and could even cause damage to other parts of your system. Pump alignment is important for any type of water-based system, including wells, irrigation systems, septic tanks and more.

Why Does It Matter?

Pump motors need to be aligned on a regular basis so that they are always working at peak efficiency and effectiveness. This will save you money on energy bills and prevent any damage to your equipment or home. A small mistake in alignment can lead to major problems down the road, such as costly repairs or replacement parts. Pumps are expensive pieces of equipment, and when they break down unexpectedly, it can be devastating financially as well as emotionally.

Pump Motor Alignment Systems

There are two main systems used by manufacturers to align their pumps: “induction-alignment” and “magnetic-alignment.” Both systems work by using magnets or coils to move small pieces inside the pump casing so that they can be aligned correctly.

The most common way for a pump motor alignment system to be installed is as an integral part of the pump assembly itself, but it’s also possible for it to be installed separately from the pump if needed. This can happen if you have an older model engine where there aren’t any provisions for an integral system or if you need to repair or replace one that has been damaged or worn out by excessive wear.

Methods of Pump Motor Alignment

There are several different methods for aligning a pump motor, including:

Visual Inspection

This is one of the most common methods used by DIYers. With this method, you simply look at each individual piece inside the pump and make sure they’re all in their proper place. You can use tools like callipers to measure distances between parts if you want to be more thorough about it.

Electrical Testing

Another popular method of alignment involves checking how well electricity flows through each part of the pump when it’s running at full speed. If there are any electrical problems with your pump, this test will tell you right away!

Shaft To Shaft Alignment

The shaft to shaft alignment is the most important part of a pump motor alignment. The main reason for this is that if the two shafts are not aligned, then the pump will not work properly and may even cause damage to other components. To align the two shafts, you will need to use a dial indicator, callipers and a straight edge.

Horizontal Arc Alignment

Horizontal arc alignment is an important part of a pump motor alignment as it ensures that your pump operates at peak efficiency and also prolongs its life. A horizontal arc is an arc-shaped line drawn on each side of the output shaft of your pump that represents the input speed of your motor. If your horizontal arcs are not aligned, then it can cause vibration in your motor, which can lead to early failure or poor performance.

Reverse Indicator Alignment

Reverse indicator alignment refers to making sure that your reverse indicator lights up when it should (when there’s an issue with the pump). If these don’t line up correctly, there’s a good chance that your reverse indicator may not light up when needed — or worse yet — might stay lit all of the time! Either way, this can lead to serious problems down the road…so make sure you take care of this before installing it in your vehicle!

Causes Of Pump Motor Misalignment

Misalignment in a pump motor can be caused by many different things, ranging from the over-tightening of the motor mount to pumping oil that is too thick. Some of the most common causes of misalignment are listed below.

  • Overtightening of the motor mount
  • Use of the wrong type of seal on the shaft
  • Incorrect alignment at the assembly stage
  • Use of the wrong size impeller or diffuser on the pump!
  • Excessive vibration during operation
  • Pumping dirty oil or water with solids in it!
  • Using an old worn out pump


Pump motor alignment can save money and help your equipment run smoothly for longer. Of course, it’s usually easier to pay a professional to do this work. But if you feel confident, there are some things you should always keep in mind when doing this yourself.