1)First, you turn the square belt lifter on the front of the power nozzle until the red arrows line up (belt off)
2)Remove the power head from the front of the machine. Now turn
the belt lifter the other way and line the green arrows up again. This
releases the tension on the belt
3)Turn it upside down and release the two clips that hold the metal baseplate on and remove the baseplate.
4)Grab the brushroll and pull it out of the power head. Slide
the new belt onto the center of the brushroll. It will hang loose...it
doesn't have to stretch around anything yet. MAKE SURE THAT THE
BRUSHROLL SPINS
FREELY!! If it doesn't, you'll burn all new belts quickly due to the added strain on the belt.
You can get a replacement belt here:
Kirby G5 Replacement Belt