I have a Kirby Sentria no suction, fresh bag, new belt, totally cleaned and taken apart and belt and head gets hot after turning it on for a short time.

try running motor without belt if still gets hot motor overheating if doesnt get hot make sure belt not slipping

If the tray comes off the machine this is caused by a stretched belt, customers forget get to take of the tension of the belt when not using the shampooer, if left on the belt lifter hook it streches the belt. fit a new kirby genuine goyshan belt

that means its working properly. If you have no suction then it is usually the belt and or the bag. so make sure your bag is not full , make sure everything is attatched properly and the green light is on.... The Kirby is the best vac out there and little suction should never be a issue for us.. I am a proud owner of the sentria..Love it..

I just took a stiff piece of coax cable, and took the bag off where it attaches to the main unit, and took the head off ( the part with the brush roll in it) AMD cleaned every thing really well, turning the spindle for the fan while " snaking" it and pulled out a baby sock! Ta-Da! Works like New.

Take the front off the vacuum and check inside both the front portion and the canister for additonal clogs. Sometimes something will get caught in the impellor, causing the motor to overheat. Since there's little suction and the smell, I'd guess this is what happened.

An Ultimate G has lots of suction. If you turn on your vacuum and the bag immediately inflates - that is how you can tell if your Kirby is moving air (suction). There is a more modern brush that came out with the Ultimate G Diamond and the Sentria that has stiffer bristles that dig up pet hair better.

Another way to test the suction is to spread some baking soda onto a hard floor and vacuum it up - you can see how much suction your Ultimate G has, or take off the vacuum head and put on a hose and test the suction at the end of the tube.

Ways to increase your Ultimate G cleaning efficiency. Take off the vacuum head and remove the brush roller. Attach your hose attachment and **** vacuum out the head. Put on a new belt, and remove any hair and or string or threads that may be wrapped around the brush roller. Put the roller back on and on the ends of your roller you will see that the ends spin and have numbers on them. If your vacuum brushroll is original - you could have your bristles rather worn and so you can align the #3 on BOTH sides of the brushroller. This would be a good time to consider upgrading to the Sentria Brush.
Remove the bag, and replace with the CLOTH Kirby bag. It has the best filtration and it has the best airflow (which increases what you are referring to as suction). If you want to go the cheap route - at least get the paper Micron Magic with HEPA filtration (but it has slightly less air flow)
Remove the side mini emptor from the vacuum and check to see if there is anything clogged up on either the vacuum or the mini-emptor.
If your engine is running and inflating the bag and you replace the belt, the brush roller and to the cloth dust bag - your vacuum should pretty much run like a brand new Sentria Vacuum. Your vacuum system is outstanding, but may benefit from a little TLC if you have been neglecting it.

remove the cloth bag from the bottom it twists counter clockwise, un clip the bag from the top remove the head piece, turn the belt lifter clockwise and release the lever to remove the head, take off the head, in your attachments there should be a screen that covers the impeller that the belt rides on it goes on like the brush head, put your hose onto the bag port by turning clockwise. there it is it will not work without the screen cover. thanks Rene

Yes G3 and G4 had different gasket thus the suction blower connector connecting Kirby hose to the unit on later models is different. You do not need to replace entire hose but just the plastic part that connects to the vacuum. You can find it HERE. To remove old connector you may have to submerge the end of the hose into hot water (not to hot to touch) so the vinyl becomes soft and you can bend it in with finger bringing plastic end over the lip on the molded end of the hose.

Good Luck

As far as picking up - I suspect that your belt is not properly installed. Watch the video manual HERE. in the first halve of the video there is an instruction how to properly instal nozzle.

You have to turn the bag about 30-40 degrees countercloclwise so plastic protrusions on the tube top adater (ones that keep bag attached to the tube) will allign with cuts in bag cardbort so you can pull the bag off the adapter. If you will take a look at the new bag - you will see what I am talking about.

you have to make sure the green light is on.. in the corner .. and if it is that means its working properly. If you have no suction then it is usually the belt and or the bag. so make sure your bag is not full , make sure everything is attatched properly and the green light is on.... The Kirby is the best vac out there and little suction should never be a issue for us.. I am a proud owner of the sentria..Love it..