Pneumatic mixers are extremely reliable and relatively simple machines -- in both design and operation. With proper care it’s not uncommon for pneumatic mixers to remain in service for as long as 20 years before they need to be repaired or replaced. Following a few simple rules of operation and easy routine maintenance recommendations will go a long way toward maximizing your mixer’s service life.

Quality of supply air

As with any pneumatic equipment, it’s critical that the supply air is free from moisture and particulate material. To ensure this, simply install a moisture trap and filter in the air line ahead of the motor. For the most efficient output and control of speed, use air lines that are the same size or the next pipe size larger than the motor intake port for efficient output and speed control. Use ONLY compressed air to drive motor.

Consistency of lubrication

Lubricating is necessary to prevent rust on all moving parts. An automatic air line lubricator should be installed 18” or as close as possible in the air line just ahead of the motor. Use #AD220 or a detergent SAE#10 automotive engine oil for lubricating. Adjust the lubricator to feed one drop of oil for every 50-75 CFM of air moving through the motor. Failing to properly lubricate will cause excessive internal heat build-up, loss of internal clearances and rapid motor damage.

**Caution: Only operate with the impeller submerged in the material (under load). Never allow air motor to “run free” at high speeds with no loads. Severe damage and/or injury could result.

Cleanliness of exhaust muffler

While it won’t impact the service life of the motor, a dirty or clogged exhaust muffler will restrict airflow and reduce motor performance. Keep a clean muffler installed to keep your mixer running at optimal performance. 

Routine Maintenance of Pneumatic Mixers

When all these guidelines are followed, then the first maintenance check is not necessary until 500 hours of operation. To perform routine maintenance, simply check the inline filter and exhaust muffler. If needed, clean or replace the filter and muffler, and upon visual inspection, determine if greater or less time than 500 hours will be necessary between future maintenance cycles. This one simple procedure will help assure the product’s performance and service life.

If any of these variables are not addressed, and equipment is not properly maintained, you will very likely notice the following signs of decreased motor performance:

  • Decreased motor speed
  • Difficulty starting motor in higher viscosity materials
  • Change in motor sound

If you are experiencing any of these issues with your pneumatic mixer Fawcett offers a full repair service with free estimates. Click here for more information: Fawcett Repair Center

Bonus: In addition to following these simple rules of operation and routine inspection to maximize your mixer’s service life and optimize performance, it’s best to keep the impeller itself as clean as possible. Ensure minimal or no debris or material build-up to achieve the best possible mixing action.


For over half a century, Fawcett Mixing Equipment Specialists has looked at new ways to improve quality, maximize efficiency, and minimize safety concerns to find solutions for a variety of mixing applications.

Let the mixing equipment specialists at Fawcett help you find the precise solution that works for your mixture requirements. Contact us today to learn more about our Pneumatic Mixers and all Fawcett products.