I have a Series G Kirby Model G7D. The other day when I was vacuuming all of a sudden the TechDrive (Power Drive Assist N/D) pedal fell off. I see the hole that it goes into but when I put it in it's loose and falls out and doesn't control the power drive anymore. When I shook the vacuum I heard something rattling around inside the vacuum head. So I unscrewed the bottom and looked inside and found a small metal part labeled K3 on one side and T on the other side. It looks like it would fit on to the end of the metal rod of the TechDrive because it has ribbing inside the hole that would fit the ribbing on the TechDrive rod that goes into the vacuum head. But I don't know how it's supposed to line up to the other parts so the (Neutral & Power Drive) will work once I put it on. Is there anywhere I could find a picture that would show me how it should fit together?

this is the Exploded Parts Diagram.

https://www.partswarehouse.com/Kirby-Ultimate-G-Diamond-G7-Upright-Vacuum-Cleaner-s/2818.htm

It is a common fault. There is a video here

https://www.google.com/search?q=how+to+fix+a+kirby+vacuum+neutral+and+drive

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The pedal will need to be replaced. A shift mechanism pressed on the end of the shaft has come off and cannot be re-installed. The drive unit must be removed from the machine, and the pedal assembly and shift cam can then be replaced. This may not be a do-it-yourself repair, as a good deal of disassembly is required.

The drive/ neutral pedal assembly must be replaced. This part is pressed together and cannot be repaired. A new assembly is about $17-$20. The power drive unit must be removed from the machine.

This requires removal of the transmission assembly and replacement of the pedal assembly - it cannot be repaired. The handle and upper motor shell must be remove to access the transmission assemby. There are two screws in front, and two under the plastic switch plate.

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.

The green light is just to inform you that the brushroll is spinning. there is a magnet on the brushroll that makes the green light come on every time it rotates. also why it looks like the light flickers because the magnet only makes contact once per rotation of your brushroll. Let me know if you have any other questions.

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

I believe you called me after posting this question but for all other folks that may come across I'll repeat - ANY of following Kirby model shampooers will work - G3; G4; G5; G6; Ultimate G, Ultimate G diamond edition and Sentria.

Good feedback would be appreciated
THANK YOU

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

http://geeksquad.fixya.com/ThreadView.aspx?prdid=11557&thid=617575
Manual
Posted by Caroyl on May 23, 2008
Is there a manual I can download online for the
Kirby Ultimate G Series Diamond Edition, Model G7D?

Hello,
I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure. My suggestion is that you contact the Kirby Co in Cleveland listed below and they will instruct you either to down load a owner’s manual or they will mail one out to you, there might be a local Kirby dealer in your area that might have a manual as well. 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://kirby.com/ Customer Service – United States & Canada 1-800-494-8586
Hours 8:00 am to 5:00 pm (EST) U.S. & Canada Fax # 1 (216) 529-6146
Mail To:
Consumer Relations
The Kirby Company
1920 West 114 Street
Cleveland, OH 44102
Thanks, Don the Vac Man
Go Ahead. Use Us.