Broken techdrive when techdrive is in the drive mode the vacum pulls away from me as if its popping a wheely and its trying to go so fast that the front will not stay flat on the carpet.

I've had that exact issue with a Kirby Diamond Edition. What has happened is that the bracket inside the machine that activates the forward and back motion of the tech drive has come out of its slot. The only way to fix this is to disassemble the machine and put it back into place.

http://www.vacpartswarehouse.com/category-s/99.htm?gclid=CPScgteG0KgCFQEKbAod8x8QiA

This should help

Best of luck

The pedal assembly must be replaced, as it has a gear pressed to it which has come loose. The handle, switch plate, and upper motor cover must be removed first. To remove the plastic switch plate, remove it's screws and insert a flat screwdriver into the rectangular slot in it to pop it of. Four screws hold the motor cover in place. Next the switch button must be removed. The Techdrive assembly can be removed by removing the three screws on the bottom. Drop the drive down, and unhook it's belt from the gear on the end of the armature shaft. The pedal assembly can be removed by removing the remaining screw from the bottom of the drive unit. The N/D pedal has two parts - the pedal itself, and the shift cam. Observe carefully how these units fit together. After installing the new pedal and replacing the screw to secure it, re-install the drive unit. The shift must be in the Drive position to install it, and replace the belt. Be sure to line up the arm on the drive unit so that it engages the slot at the base of the handle pivot and re-install the other items.

on the bottom of the vacume you should see about 4 screws ( philips ) that hold the plate in place, remove the screws and plate and this will expose the motor shaft,belt and roller ( you should also see the broken belt there two ) -- pop out the roller ( pull straight up ). put new belt onto the motorspindle and then onto the roller, snap roller back into place ( note: on the edges of the roller it is somewhat keyed to only fit into the vacume a certain way ), replace the the plate and screws and you are good to go. also while you are getting dirty -- clean the air filter and examine the hose between the floor roller and the suction hose for dirt build up and debris.

c...

I would guess the belt that powers the drive unit has broken. It needs to be replaced.

See if THIS helps.
Not sure how far you went disassembling the unit so here are a few more useful articles that you may want to see:
How to connect wires
How to get the transmission installed.

Rocky

Kirby N/D pedal is an assembly that can not just come out. So I would say that it is most likely broken. See THIS ITEM and if the part that was left on the floor is just a part of what you see in the picture then it is broken.
It is possible to assemble it back together but usually it falls apart again fairly quick and it is hard to get the angle at which pedal must be reassembled. We usually do not mess with it.

Good Luck

Hi

Ensure clutch selector knob front left lower side is in drive mode when you pull back the handle to vacuum.

http://dysonmanuals.llc.nu/

Chris.

look under the vacume cleaner and take off the cover make, shure the belt is where it needs to be, you should have a setting on the vacume cleaner that gives you an addjustment for the carpet your on, raze it up.

check belt not broken - could have happened when you caught tassle in head