My vacuum has become extremely difficult to move when vacuuming my carpets - have to really keep press down on the handle to push the vacuum forward

The key to getting an Oreck to move or push is to use as low and angle of the handle as possible. The more upright the handle, the harder the machine is to push (move). The lower the angle or the closer the handle is to the carpet, the easier it is to move (push). Use a straight stiff arm that is pointed down and move your arm at the shoulder with a near locked elbow.

put your foot on the head then pull handle down

Hi there,

I'm sorry to hear you're having difficulty using your DC33 on this particular carpet. If you haven't already contacted our Helpline, I'd encourage you to do so, as we'll be able to discuss other options which may be more suitable for your needs.

You can reach us on 0800 298 0298 (UK), or 1-866-693-9766 (US). We'll look forward to hearing from you.

Best wishes,

Jack
Dyson Online Customer Support
http://www.dyson.com

Move the carpet height control switch to a higher position if the vacuum is difficult to push. If the setting is too low for the carpet being cleaned, the brushes press against the floor preventing the vacuum from moving easily.Set to a medium-high height setting then check.Slide the "Self-Propel" button to the "ON" position if the cleaner does not self-propel. -----------
The self-propel feature operates only when the cleaner switch and the self propel button are both ON. ---------- Try this settings and check.This should help.Thanks.Helpmech.

Check the axles of the wheels for debris accumulation. Also, make sure the height is set for the type of carpet that you have. Try pushing the machine on a bare floor--is it hard to move there also? Hope this helps!

tip unit back to lift brushes off floor and roll forward until over carpet edge. tip back unit to sit flush on carpet and unlock handle so it swings freely. now pull backwards ith finger on spray trigger. that's how it works, not by pushing forwad.

the lever on the handle should be pressed when you want to apply solution to the carpet

If you removed the bottom of your vacuum, then it's quite possible that the squeegee was not installed properly. On the side of the squeegee that faces up (to the operator) there is a groove that snaps over the baseplate. If the groove isn't snapped ove the baseplate, the vacuum is extremely hard to push (don't ask me how I know and I won't have to lie).

on the front of the base there are 3 very small rollers made out of rubber, these are either just dry and won't turn or worn and or damaged,

that is your problem / honest its that simple