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depending on the age of the machine, there could be several possibilities
1-- belts are not tight enough--- belt tension system is not correct, wrong length belts
2--bearings for the shafts for the blades are rusted up and seized - preventing the blades from moving--- switch the machine off , disengage the belt drive and see if you can turn the blades by hand
3--- if you have an electric pto system to drive the belts to the blades then that system is not getting full power to engage the PTO or the clutch is not working--worn facings
take it to a service dealer and have a proper diagnosis done
:) welcome to the world of industrial machines. The good news is they are typically simple machines.
It is a good habit to take a few minutes to clean and oil your machine before you start sewing. Look for the oil points and give it one drop of quality sewing machine oil in each port.
Now let's try to determine why the hand wheel isn't turning. Loosen and remove the belt from the large reducer wheel under the table to the sewing machine. Try to turn the hand wheel. If it does turn.... Good! If it doesn't turn... we know the problem is in the the machine head and not the wheels below.
Make sure there is no bobbin thread or upper thread. Try to turn the hand wheel again. Anything?
Look carefully at the machine... is the take up lever bent? (personally had this happen with friends helped me move a big machine like this.)
Keep working this way... inspecting the machine until you find the problem. Good luck
Check the rear endcaps for damage. If they are OK, find the allen key that came with the treadmill (you used it to assemble the machine) and go to the back of the machine. If the belt is rubbing, find the left adjustment bolt and turn the screw 1/2 turn clockwise. Now, by hand move the belt a couple revolutions. If it still rubs, repeat the procedure till the belt stops rubbing. Now run the treadmill about 3MPH and fine adjust the belt by turning the screw 1/4 turn until straight. If the belt is not rubbing, run the machine (3MPH) and adjust the left bolt clockwise 1/8 - 1/4 turn watching closely till the belt is centered.
if you hear the motor moving with no belt turning the problem is either the front roller or the drive belt. If there is no motor movement then this is usually an indication of a bad control board located under the lower section of the treadmill.
Make sure that yo have the correct belt. I am sure that you have already done this. It sound like the drum it stuck. Make sure the drum will spin. Also without the the belt on make sure the motor will work on its known. See if this will help
I assuming these hex screws are near the rear of the unit. But they should not affect operation unless really out of whack, but they should be adjusted with the belt moving. Try manually moving the belt first.
If it moves and If it is a newer machine more than likely the motor sensor is telling the control board that the motor is not working and it is shutting down as a safety measure.
The Elite upright may need to have its drive belt checked. Check that the machine roller is still working. Then turn the vacuum off and locate the screws on the floor head by turning the machine over. If you remove a couple of screws the floor head will come off and you can check the belt. Usually old threads and hair can stop the roller bar from moving properly or may have got to the belt. Ensure that it moves freely simply by turning the roller with your hand. If it doesn't then its possible that the roller needs to be cleaned or the belt needs to be replaced. Drive belts are easy to get for most Hoover products; a smoke smell like burning rubber usually indicates the drive belt is about to give up or has simply snapped. Dont forget to rate if this solution has worked for you. Ty.
Make the machine safe from the power sourcefirst
When you remove the belt access door you are looking at the pump belt,
To gain access to the brush belt you must turn the machine over and remove the brush at the bottom of the machine.
there are two screw in the red retainers at each side of the brush, remove the screws and the retainers and the pivot arms ,you should see the brush belt and the pump