Not agitating everything else works - Maytag MAV8557 Top Load Washer

Is this a machine withwith an agitator & a fixed drum? If this is the case I would think that the drive belt has stretched or broken.

Sounds like a drive belt slipping. Look under the base and see if the belt is tight between the motor and agitator base

I believe there is a set screw or screw that goes throught the agitator to the shaft.

The agitator is driven by a couple of different methods. The first is the agitator is splined and slips onto the matching splines of the agitator shaft from the transmission. The second is the use of a bell coupling which is splined to the agitator shaft as well and the agitator snaps onto the coupling. If the agitator does not agitate, first remove the agitator and watch the agitator shaft to see if it is working properly. This will require a small load setting of water and the machine set to run. If the agitator shaft is working properly, it is either the splines on the agitator or the bell coupling that is defective. If the agitator shaft does not work properly, the problem is in the transmission.
Hope this helps.

HI. this is usually caused by a faulty drive assembly(agitator gear components and clutch malfunction).

I recommend replacing the agitator components by purchasing a Agitator replacement kit. and, replace the clutch assembly as well. this will fix this issue.

Your agitator dogs must be replaced.
With a flat blade screwdriver pry off the top cover on the agitator.
Remove the 7/16 bolt inside.
Pull up on the agitator and remove it.
Purchase the agitator dog kit from the appliance parts store.About $10.00.

look on the inside your agitator makesure it not strip out cauing your agitator be lose might need to replace agitator

The plastic inside the agitator cog are worn.

Take off the top of the agitator. If any screw are available remove them. If not grab the agitator from the bottom and yank off. Unscrew the agitator drive cog and inspect underside of agitator. Go to an appliance repair shop and reorder a new one. Between $15-30.

A wears out clutch might prevent the washer from agitating well or at all. If the clutch is worn, you need to replace it. Good luck!

The pull at the bottom of transmission should turn both ways.. one way for spin the other way for agitate... if transmission turns both ways means not locked up and probley bad motor..