Brand new agitator does not rotate. I realized that I did not buy a new "seal-cap" that goes between the agitator and the cap. Would the missing cap cause the agitator to fail to rotate? GE spacesaver washer/dryer model # wsm2780wbwww

There are no washers of any sort on the Dyson's agitators. There are molded caps on each end, made to fit into the bracketry on the sides of the nozzle portion. If there's it seems as though there's something missing then you'll need to purchase a complete agitator, there are no replacement parts for agitators.

Post your model number HERE for diagrams and parts list you can order parts from.

you could spray the affected part with silicon,or cover the cap with a polythene bag?simple but effective.

Small garments can get caught under the bottom agitator. Disconnect power then remove the agitator cap to expose the agitator bolt. Using a small flat-head screw driver, insert it between the agitator and the cap then pry the cap off the agitator. Remove the barrier cap if present then remove the stud and seal holding the agitator to the shaft using a 7/16" socket wrench with extension. Once the stud and seal are removed, lift the agitator off the shaft. You may need and extra shear of force when pulling the agitator off the shaft.

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Does the lower half of the agitator still operate normally? (Back and forth) Can you spin the top half (spiraled part) of the agitator in both directions with out the lower half moving? If so then you have a worn set of agitator "dogs" they are little plastic ears located in the upper half of the agitator and catch the notched inner section of the agitator to make the top action work like a corkscrew, slipping one way and driving the other as the lower half goes back and forth.
To get at these parts you will need to remove the agitator, Remove fabric softener dispenser or cap on top, and look down inside tho opening.
You will need to remove the plastic cover inside that has two ears sticking up, pull on one side or the other and it should pop out, there will be a rubber seal around it so it will be a little difficult to remove.
Now you will have access to the bolt that holds the entire agitator in the machine. The agitator dogs are located right on the outer edge of the center cup that the bolt goes through. To access them you will want to seperate the two halves of the agitator and flip the top half upside down while holding your hand inside it to catch the cup with the dogs in it. Part number 80040, for the dogs.
Good luck to You!!

The agitator dogs (part # 80040) that grip and turn the top agitator to push the clothes into the bottom agitator during the wash cycle are worn and must be replaced. It costs about $5 and replacing it is an easy task to do.

Disconnect the power to the washer. Open the lid and remove the agitator cap by prying it with a flat-bladed screwdriver off the agitator top. Remove the 7/16 inch stud and seal holding the agitator to the shaft using a socket wrench with extension.

Lift the agitator off the shaft and pull the top agitator off the bottom agitator. Remove the cam that holds the agitator dogs from the top agitator.

Lay the cam upside down and install the agitator dogs on the slots. Hold the cam with the newly installed agitator dogs on one hand and the top agitator upside down on the other. Slide the cam up into the top agitator and turn the assembly in the upright position.

Align the cam and bottom agitator tabs and cut-outs and place the top agitator with the cam over the bottom agitator. Place the agitator assembly on the shaft and rotate it until the grooves match. Push the agitator down and reinstall the stud and seal. Do not over tighten the stud or the agitator will not spin properly.

The small plastic pieces that are located under the agitator center cap that grip the agitator and turn it during the wash cycle are worn out. They are called agitator dog ears or clutch dogs. They must be replaced.

1. Unplug the washer.
2. Remove the fabric softener dispenser, if there's any, by pulling it off the agitator top.
   
3. If no dispenser is installed, insert a flat screwdriver between the agitator and agitator cap. Pry the cap off the agitator then remove the upper part of the agitator.
   
4. Remove the barrier cap by pulling it up.
   
5. Use a socket wrench with extension or nut driver to remove the stud and seal holding the agitator to the shaft.
   
6. Remove the agitator mover by pulling it off the agitator.
   
7. Turn the agitator mover over on your palm. The cam and agitator dogs will come out on your palm. Pay attention to how the agitator dogs are installed. Remove the worn agitator dogs and install the new ones.
   
8. If the agitator dogs are not worn, check the agitator shaft. Remove the round rubber seal off the top of the agitator and remove the agitator by lifting it straight up. Call up service if the shaft is worn.
   
9. Reinstall the agitator. Rotate it until the grooves on the agitator matches the grooves on the shaft then push the agitator down.
10. Place the round rubber seal in the groove on the top of the agitator.
    
11. Turn the agitator mover over and carefully insert the cam and agitator dogs up into the agitator mover until it stops.
    
12. Carefully turn the agitator mover over in upright position.
    
13. Place the agitator mover with the cam and dogs over the agitator, lining up the tabs. The cam has a cut-out and tabs across from each other. The agitator has tabs across from each other. All of these must line up in order for the cam to slide down on the agitator.
    
14. Push the cam down until the tabs snap together.
    
15. Put the upper part of the agitator back.
16. Using a socket wrench with extension or nut driver, insert the stud and seal through the agitator into the shaft and tighten it.
17. Push the barrier cap and seal down into the agitator mover all the way. Make sure the round gasket is in the groove in the barrier cap. The barrier cap must be pushed down past the holes on the mover to allow the liquid from the dispenser to flow.
18. Press down on the fabric softener dispenser or cap until it is all the way down on the agitator.
    

it is a "trany" problem...just buy a new washer or it is a plastic cap inside that spiral part, that cap have groves...it is maybe goes bad....
GE as a brand has a lot of problem with washers, dryers, microwaves and fridges...and dishwashers so try to stay away of repairing or buying a new GE....

Two-Piece Agitator: Bottom Works, Top Does Not - Whirlpool brands

Some Whirlpool brands washing machines employ a two piece agitator. The bottom is call the agitator and the top is usually referred to a 'Mover'. A multi-piece cam and bearing assembly connects the two and allows the top portion to index.

If the bearing or cams become stripped or damaged, the mover will often not work. Fortunately, Whirlpool produces a cost effective agitator repair kit that replaces all of the critical components in this cam assembly. There are three different repair kits. They differ in the height of the cam.


Agitator Removal Instructions:


Remove Dispenser or Cap:
Some models of washing machines utilize a fabric softener dispenser that resides on top of the agitator. This dispenser simply snaps onto the top of the agitator. Other styles utilize a decorative cap. To remove the dispenser, simply grab it and firmly pull up. To remove the agitator cap, insert a small flat-head screw driver into the seam between the agitator cap and the upper agitator (mover). Use a twisting or prying action to pop the cap off of the agitator.

Remove Internal Debris Cap:
Inside the agitator you will see a cap with a raised handle, much like that of your automobile. Simply reach into the agitator and twist the cap while pulling up. This will remove the cap and its o-ring.

Remove Agitator Stud:
When looking into the agitator assembly, you will notice a single nut in the center of the agitator. Use a socket kit or nut driver to remove this bolt (agitator stud).

Remove the Upper Agitator (Mover):
With the bolt removed you should be able to remove the upper half of the agitator (mover) by simply pulling up. Sometimes pulling up will actually remove the whole agitator assembly. If this happens, place the Lower Agitator on the floor and stand on the flat lip. Then Pull up to separate the Upper Agitator (mover) from the Lower Agitator.

Remove the Cam and Clutch Dogs:
When you remove the upper agitator (mover) it contains the cam and clutch dogs. Tun the assembly upside down. The cam and dogs should then come out.

-- Stop Here if Replacing Cam Kit --

Remove O-ring:
The lower agitator remains on the transmission shaft. On the top of the agitator, there is an o-ring. Remove this o-ring.

Pull the Lower Agitator:
All that remains is the lower agitator. This can be removed by simply pulling straight up on the agitator.


Agitator Installation Instructions:

Set Lower Agitator:
Slide the lower agitator onto the transmission shaft. Rotate the lower agitator until the splines in the shaft match those in the agitator. Once aligned press the agitator down. Install the o-ring into the top of the lower agitator.

-- Start Here if Replacing Cam Kit --

Assemble Cam and Dogs:
Turn the cam upside down. Place the small round ear of the dog into the corresponding slot on the cam. Repeat this for each of the four cams.

Install Cam and Dogs into Upper Agitator:
Invert the Upper Agitator (mover) and slide the cam/dog assembly inside. The cam should be pushed into the mover until it shoulders. Then rotate the whole assembly upright.

Install the Upper Agitator (Mover) on the Lower Agitator:
The lower agitator has two tabs that stick up that are 180 degrees apart. These tabs fit into two slots on the bottom of the cam. Align the matching tabs and slots and place the Upper Agitator (mover) and cam assembly onto the lower agitator. Push down until the cam snaps onto the Lower Agitator. If the dogs fall out during this step it is necessary to return to the 'Assemble Cam and Dogs' section above and start over.

Install the Agitator Stud:
Place the bolt (agitator stud) into the hole in the bottom center of the cam. Use a socket kit or nut driver to tighten the bolt .

Install Internal Debris Cap:
Install the o-ring into the groove on the OD of the debris cap. With the o-ring in place, push the cap into the Upper Agitator (mover). It is important that the cap is pushed past the ports in the Upper Agitator (mover) so that the wash water can enter and exit as designed.

Install the Dispenser or Cap:
The final step is to replace the top cap. Both the cap and the dispenser simply snap into place. Just make sure they are installed as far down a they will go and are firmly in place.

Remove the cap off the top of the agitator. Then remove the 7/16 bolt below. Your problem is inside the top part of the agitator. YOu need to buy an agitator dog kit. When the part is removed you will see how to put it in.