Large loads put a strain on the motor. There can be lots of causes but these three are the most common.
Cause 1
Agitator Repair Kit
If the washer won't agitate, replacing the agitator repair kit may solve the problem. The kit contains the agitator components that are most likely to wear out and/or fail. If any of the parts are worn out, stripped, or damaged, replace the kit.
Cause 2
Drive Block or Bell
The drive block connects the washer transmission to the agitator. If the drive block is worn out, the transmission shaft will still move back and forth, but the agitator will only move slightly or will not move at all. Inspect the drive block for damage. If the drive block is worn out, stripped, or damaged, replace it.
Cause 3
Motor Coupling
The motor coupling connects the motor to the washer transmission. If the washer is overloaded, the motor coupling will fail in order to protect both the motor and transmission. The motor coupling can also fail due to normal wear. Inspect the motor coupling to determine if it is broken. If the motor coupling is broken, replace it.
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I have a Kitchenaid top loader that works great until I do an extra large load. It fills with water but will not agitate. Agitate works on all other load sizes! On extra large sometimes it just sits silent after filling until the timer gets to drain and spin it then refills for the rinse cycle which is again hit or miss if it will agitate. I have found that when this is happening if I lift the full barrel from the inner sides and turn it slightly the motor kicks on and it starts agitating as it should. Lifting some of the weight of the load and turning the barrel a little makes it work? Is there some kind of pressure switch? Small medium and large loads always work fine. Thanks for any help.
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