It has been my experience with knocking kitchenaid is one of three reasons all related to the speed control of the mixer1 speed control board adjust speed screws2 speed Phase control board, needs replacing3 The motor governor behind the speed control board needs replacing
Speed board = $9.00Phase Board = $20.00Governor = $10.00Your time + one week for ordered parts asnd one hour to remove and replace.
all work is performed at the rear of the mixer and you need only a phillips #2 screwdriver, a pair of needle nose pliers, an 11/32 open end wrench (you will need this to adjust your speed control board after new install) and that's it. easy work all remove and replace. Oh! make sure that you pit some thermal paste behind the phase control board to avoid burn out.
But!!! before you buy parts and do all that, try adjusting the speed contol board first. Go here for a parts list for your model.
http://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=KV25G0X&siteCd=KAD&userType=Servicer then go here for instructions on tuning the mixer speed.
http://www.youtube.com/watch?v=pUo_ZU5xh3o if after you tune it you still get the knocking then use the parts list to order parts. two good parts sources are goodmans.com and mendingshed,com, they are reliable and have the parts in stock.
we need a make and model number
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