We have a Whirlpool LBT6233DQO washing machine. It works fine, except sometimes during the spin cycle the agitator will work loose and rattle about in the tub, making quite a racket.
I cannot see anyway to secure the agitator to the spindle, it just slides over it. This particular machine was a display unit (it even has a sticker saying "display unit" under the lid). The reason I mention this is could it be possible the agitator was made to easily slide off for demonstration purposes on display units?
Any ideas?