How-To Blogs & Videos
Troubleshooting Your Air Compressor When Your Motor Just Hums, Clicks, or Won't Start
There’s no sound more frustrating in a workshop than the failed attempt of an air compressor to start. Instead of the satisfying roar of a motor kicking on, you get a hesitant hum, a lonely click, or, worst of all, silence.
When this happens, your project stops, but the solution is often simpler (and cheaper) than buying a new unit. At Master Tool Repair, we know these symptoms are clues. Here is your definitive guide to diagnosing the three most common air compressor motor issues and gett
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Dec 17, 2025
How to Test an Air Compressor Motor Capacitor
Is Your Air Compressor Motor Failing? It Might Just Be the Capacitor!
If your air compressor won’t start, runs sluggishly, or just hums instead of kicking on, the issue may not be the motor itself—it could be a faulty capacitor. Knowing how to diagnose capacitor failure can save you time and money by avoiding unnecessary motor replacements.
Signs of a Bad Capacitor
A faulty capacitor often mimics motor failure, but here’s how to tell the difference:
✅ Capacitor Failure Symptoms
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Feb 21, 2025
A Comprehensive Guide to Selecting Electric Motors for Air Compressors
The Top 6 Things To Consider When Choosing an Electric Motor for Your Air Compressor
Are you in the market for a new electric motor for your air compressor but feeling overwhelmed by the options available? Don't worry; we've got you covered! Here are some essential steps to help you navigate the selection process and find the perfect motor for your needs:1. Determine Your Horsepower Requirement
Assess the power needed for your specific application by calculating the required horsepower (HP)
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Mar 19, 2024