How to dissasmble vacuum cleaner, kirby g4 to check if motor or switch is bad

Before you do all this, check the cord where it mounts to the handle up top by the pivoting strain relief. Frequently the cord goes bad right where it snaps in the strain relief.
first you will need to remove the handle, bag, and the cord. there is a release button for the handle, the mini emptor on the bottom of the bag twists off away from the body. there should be 2 screws on the scuff plate, one to hold the cord strain relief and another down by the transmission for the scuff plate. use a small flathead screw driver in the slot of the scuff plate and pry up. it will pop off. you should also take out the screw in the cord cover where it plugs, pop the cover off and remove the cord. now you can remove the top cover. there will be 2 screws in the front of the unit, and 2 screws under the scuff plate. they are either phillips or T15,T20 torx. remove those 4 screws and you can lift the top cover off and access the motor and the switch. check for bad motor carbon brushes and a worn commotator where the brushes ride. let me know if you need anything else.