About Air Compressors.com

More than 16 years on line helping folks with their air compressor problems!

You are here: Home / Sears compressor motor running and belt squealing

Sears compressor motor running and belt squealing

My sears compressor starts pumping fine until about 60psi and then the pump stops and the electric motor keeps running squealing the belt.when i shut it off and turn the pulley by hand the pump turns free and easy.

___________________________

Mmmm, yes, that is odd.

As the pressure in the tank increases towards cut out pressure, the load (the work the pump and consequently the motor has to do to pump more air) increases.

So, it seems to me that as the load increases the harder work is stalling the pump.

It could be that the heat that is generated by the pumping process, causing something to bind in the pump, stopping the pump sheave, and forcing the belt to move through the sheave groove instead of rotating the sheave. This would create the squealing sound you hear.

You say that you remove the belt, and the pump sheave turns easily by hand, which seems to contradict what I’ve just said.

Unless, the time it takes you to disconnect the belt allows the unit to change (cool?) in some way that relieves the binding.

First thing though? Check the alignment between the two sheaves as well as the mount of the pump and motor to ensure that as the back pressure grows, that isn’t forcing them out of proper alignment?

Well, what did you find? Please leave a comment and tell us the model of the compressor, and upload a photo or two via the form below.

 

 


New comment? New question? Please add it here along with photos to help others help you with your compressor and equipment problem!

Subscribe to this page / comment / post
Notify of
guest
guest
0 Comments
Inline Feedbacks
View all comments

Search here to find the specific compressor info you need!

The latest pages added to this site include…

  • The Porter Cable compressor tank is full, but I can’t get air to come out? – December 2020
  • The compressor appears to compress the air but there no air at the hose on a 921.166460 – December 2020
  • Bambi 75/250 won’t build air after being on its side – November 2020

Getting around this site…

  • About Air Compressors
  • Sitemap – About-Air-Compressors.com
  • About Different Brands of Air Compressors
  • Calculating CFM
  • Identifying An Older Air Compressor
  • Jim Graham

Troubleshooting a compressor. Issues common to all and by the compressor make.

  • Troubleshooting Your Compressor
  • Compressed Air How To
  • Picking A Compressor
  • Air Compressor Parts
  • What Is My Compressor Worth

To help you understand compressors!

  • Compressed Air Treatment
  • General Compressed Air Information

Disclosures etc.

  • Privacy Policy
  • Disclaimer & Copyright Policy
  • Contact About-Air-Compressors.com
Want to bragg about your gorgeous computer rebuild? We'd welcome it here!"

RSS feed information.

If you wish to be updated when new comments are posted, add: about-air-compressors.com/comments/feed/ to your RSS reader. Thanks.

© 2021 · about-air-compressors.com ·

wpDiscuz