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78sharpshooter

Belts slipping on 50 lbs LG

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i.5 HP motor spins at 1755 so the twin belt pulley is around 2.5" diameter and the belts slip to the point that the pulley gets pretty hot. I have it tensioned quite tight but was wondering if anyone else has input on how to fix this.

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Be certain the belts match your pulley width. V-Belts come in different widths  A, B, C etc;.

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You can also buy belt dressing. A spray that is tacky and helps to stop slipping. Works well on my 50lb

Also I have a 3.25 inch pulley, the size recommended by Sid of little giant. It seems a bit to fast to me. How do you like the 2.5" ?

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Which pulley did you buy?..................

  •  
  • Belt Type A (1/2") Datum Diameter 1.90"
  • Belt Type B (5/8") Datum Diameter 2.30"

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macbruce ,

     Looks like this pulley will take either A or B according to the spec sheet.

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I know that there are specifications as far as amount of contact a belt should have around the circumference of a pulley. I Googled minimum belt contact and found one document that might help.V-Belt Design Manual - Bando USA
https://www.google.com/url?sa=t&source=web&rct=j&ei=lK0GU9SmJqKz2QXM2oG4Ag&url=http://www.bandousa.com/html/pdfs/bu-143manual.pdf&cd=1&ved=0CCQQFjAA&usg=AFQjCNGxka9DaA7KrmorEszkUYz5L4WZaQ

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macbruce ,

     Looks like this pulley will take either A or B according to the spec sheet.

Ahh, never seen that before........ B) So that can't be it.

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Start with the basics get 2 new belts.

 

Gates no longer make matched sets of belts.  They claim manufacture is so good all belts match?????

 

Try to get the Industrial, equipment type belts, Gates & Napa call them Green Belts, they are better for this type use than automotive belts.   

 

Be sure to clean and sand the pulley grooves to get old oil or rust build up out.

 

Belts look for a reason to slip.   

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Definitely new belts. If you don't need to open the belt to fit it, raw edge wedge belts with a cogged form on the inside are better than either wrapped wedge belts or the older vee belts when you have to contend with small pulleys and minimal wrap. Gates seem about the best I've tried and the lengths really are that consistent.

 

Do a really good job of degreasing the pulleys (both of them) and it might well help to take any polished surface off the small pulley. Blasting works well, but a quick once over with a fairly coarse abrasive cloth is better than nothing.

 

If they have been slipping, check the small pulley still has V-shaped grooves. If they are starting to wear U-shaped, even slightly, replace the pulley.

 

Link belts are only really a good idea for stuff where the belt has to be split to install it. I think the link belts claim to be stronger and more vibration-resistant than conventional belts is based on the old 1950s-spec Vee belts. The latest generation wedge belts are, as you'd expect, also way ahead of the 1950s stuff. Gates had their "Quad-Power" belts maybe 20 years ago that would transmit 4 times more power-per-belt than the old ones would and things have moved on since then.

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Are you sure you are running the belts the right direction? Link belts have arrows on the back to show which way to run them. They don't grip well the wrong way.

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