WASHING MACHINE WILL NOT AGITATE DURING WASH CYCLE ,WHEN IT FILLS WITH WATER. SMELLS AS IF BELT IS BURNING .

If your washer fills with water but doesn't agitate, the problem is likely to be a faulty lid switch, a broken belt, or a problem with the motor. ... 1 Check the washing machine's spin cycle. If this works, the motor is operating and the belt is not broken. If the spin cycle doesn't work, the belt may be loose or broken.
https://www.hometips.com/repair-fix/washing-machine-agitate-spin.html

https://www.youtube.com/watch?v=LMgRO4GAgBg

the motor spins with out the belt , makes me tend to discount the capacitor
I would be looking for a tub brake that is not being opened to allow the tub to agitate
there are solenoid activated brake under the machine the applies a brake when you lift the lid during wash, when the program is finished
have a technician check it out

the strap (belt) is chipped, damaged, the spindle from the VAT ruptured, cracked the tank squealing stops, etc. more details please

Sounds like gearbox or check if a belt has came off or slipping underneath.

michael, try running the wash cycle under different levels eg. normal, delicate etc without a load and see if it agitates.If not, the mechanism has diengaged.

You are referring to the "agitator dogs". Does the unit run during the wash cycle put the agitator does not move?

belt is slipping inside the machine. Just like a car the belts inside age and expand. Try a new belt

Sounds like a belt has gone bad. Tip the waher toward the wall. You might see two belts. If you do not, get me you model # and I will see exactly what nodel you have.
Please let me know if I can assist you further

Thanks
Vic

It doesn't agitate If your washer doesn't agitate, check these:

Lid switch
Motor coupler
Belts
Clutch
Drive motor
Drive pulleys
Transmission
Agitator
Lid switch If the lid switch is defective, the washing machine may not agitate or function at all. The switch is inside the washing machine main housing near the door frame. Often you have to raise or open the top or front of the washing machine to get to the switch. If it's defective, you need to replace it. 

Motor coupler Many washers produced by Whirlpool® use a small, relatively inexpensive motor coupling. It's plastic and rubber and is mounted to the shaft of the motor on one side, and to the transmission on the other. Over time, the coupler wears out and fails. If this happens, you need to completely replace it.

Belts Many washing machines have one or two belts. If a belt is broken or badly worn, you need to replace it with a genuine belt from the manufacturer. (Some washing machine belts are designed with special characteristics not found in automotive belts.)

Clutch If your washer was made by GE®, it may use a clutch for agitating the clothes. As the clutch wears out, it may prevent the washer from agitating well or at all. If the clutch is worn, you need to replace it. For this job, you probably want to hire a qualified appliance repair technician.

Drive motor Many washer brands use a reversing motor. For agitation the motor runs in one direction, for spinning and draining, the other. It's possible for a motor to burn out in one direction and continue to operate in the other. If this happens, you need to replace the entire motor. 

Drive pulleys The motor or transmission drive pulley may be worn and unable to turn the drive belt. If so, replace the pulley.

Transmission The transmission could have either of these problems:

• Older washers produced by Whirlpool® have a transmission with an electro-mechanical shifter. If the shifter becomes even partially defective, the unit may not agitate properly or at all.



• The transmission may have a worn or broken gear, or some other internal problem.

If you suspect a transmission problem, you may have to call a qualified appliance repair technician to repair it.

Agitator The inside of the agitator--where the transmission shaft attaches--can become worn, and strip out the spline that allows the agitator to properly grip the shaft. Then the transmission shaft rotates back and forth as it should, but the agitator doesn't move properly. If this happens, you may need to replace the agitator and/or the transmission spline.

it sounds like a bad lid switch if it will not drain or spin,the switch controls that-mike