Self propel does not work and it is real hard to push this way. We checked the belts and they both ok. Not sure what else to look at, the on line manual does not show any information

Hi there SmartAlec from NelsonVacuums.com.au here. Ok on this particular machine the belts strtch quite a bit and make the machine very hard to push even though the belts seem to be ok. I would recommend first making sure that the driving self propell is actually working at all. Tip the machine on its back all flat and turn it on. When you push handle up and down you should see a pair of wheels spinning one way then the other (corresponding to the way handle is pushed or pulled). As long as the wheels are moving then it is just that the wide flat belt just needs changing even though it is not broken. If the wheels are not turning at all even though belts are in place then you have a more sinister problem that will require a technition to check over.
hope this helps!
happy Vacuuming :)