Slipping belt onto motor shaft pulley

if you look on the base plate you should see a diagram of how to do it,but if yours don't have a diagram then remove the screws from the base plate it should be three or four they have arrows next to them. take the base plate off and remove the brush roller and the old belt off being sure to put on bear floor then put the belt on the drive shaft put the brushroller in left side first

The belt is slipping because something is binding up the brushes.

Yes, you need to replace the belt. You should actually change this belt every year. Here is a link to the belt you need and the manual which has instructions:

Eureka The Boss Smart Replacement Belts

Owner's Guide (3,666K download)

I had this same problem. The brush roll wouldn't spin, smoke came out, and it smelled like burning rubber. I changed the belt thinking that would fix the problem but it didn't, so I took the belt back off and checked the motor shaft in the back and found a whole bunch of hair wrapped around the shaft. Once I cut out the hair with some scissors and replaced the belt, everything worked like normal. I hope this helps.

if the belt has been slipping it may have pollished the moteror brush shaft and it just slips. take a small piece of sand paper or enery cloth and ruffen up the shaft to give it some grip.
if the metal shaft of the motor has been heated up due to slippage it will take some doing to ruffun it as the shaft will be hardend due to heat

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Generic problem for all Vacuums
Eureka the boss upright bagless
Posted by sweet0nes on July 18, 2008
Eureka the boss upright bagless vacuum. How do I open it to get to the belt area? The brush seems stuck. It won’t move.
Hello,
I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure. Knowing the brand name and model number for the vacuum but I can give you a generic way of changing the belt. You 1st need to remove the bottom plate by screws, levers or clips, then you can get @ the belt, if not then you should remove the top cover and then you can get @ the belt. 1st remove the belt from the brushroll and install the new belt on the pulley side of the brushroll and then use a belt puller or a screwdriver with a bend on the end and then stretch the belt onto the motor pulley and then track the belt in a straight line so that is running in a straight line. Replace the bottom plate and the belt change should be done. Please feel free to contact your local vacuum cleaner dealer in your area.
So if you need further assistance, please feel free to contact your local vacuum cleaner dealer in your area or in the yellow pages, or contact the factory phone number or website to further assist you with your questions.
http://www.eureka.com Customer Service
Customer Service Dept 1-800-282-2886
Electrolux Home Care Products
P.O. Box 3900
Peoria. IL 61612
Hours of Operation
Monday thru Friday 8:00am to 7:30pm CST
Saturday and Sunday 10:00am to 6:30pm CST
Thanks, Don the Vac Man
Go Ahead. Use Us.

make sure the vacuum is in the upright (locked position) - when you lower the handle, this puts tention on the belt. If it is in the upright and locked position, there is plenty of clearance (unless you have the wrong belt.