Washing machine agitator has grease on it & doesn't always turn
This assumes that you have a basic Kenmore / Whirlpool top load, direct drive, neutral drain (it doesn't spin until the pump removes most of the water) machine.
First, see the Sears parts site for your washer:
http://www.searspartsdirect.com/partsdirect/index.action
Enter your model number (###.######) and you'll see a list of major sub-components with diagrams and parts.
Also see the Whirlpool / Kenmore Service Manual for top load, direct drive washers:
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/f7e2147fa98b28cf85257122007475cb/$FILE/L-55.pdf
And the Whirlpool Parts list for these washers:
http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%20W10114743.pdf
It sounds as if the Gearcase Cover Seal may be worn and is allowing transmission oil to work it's way up the main agitator shaft.
I'd pull the motor and transmission to check for leaking and probably check all of the seals on the gearcase and drive tube.
(IT SOUNDS LIKE A REAL PAIN BUT ISN'T.) THE PARTS TO REPAIR ANY SEALS ARE INEXPENSIVE.:
For example, the above part number 3349985 is $9.09 at Sears and is a basic Whirlpool part.
See the following for how to release the console and cabinet and how to pull the pump, motor, gearcase and drive tube.
http://www.american-appliance.com/catalog/newsdesk_info.php?newsPath=16&newsdesk_id=142
In order to get the transmission out, you have to remove the cabinet, the fabric dispenser and both agitators. The top agitator uses a plastic 1/2" drive bolt (a 1/2" socket extension works well).
You don't have to remove the drum.
http://www.american-appliance.com/catalog/newsdesk_info.php?newsPath=16&newsdesk_id=137
In order to get the transmission out, you have to remove the cabinet, the fabric dispenser and both agitators. The top agitator uses a plastic 1/2" drive bolt. You don't have to remove the drum.
Lay the machine down (after disconnecting power and hoses, remove the pump (two clips), the motor (two screws hold two clips on the motor), lift and set the motor aside, remove two 1/2 inch bolts for the motor mounting plate and three 1/2 inch bolts for the transmission. Pull the transmission, remove the clutch (there is a spring clip that holds the clutch on the main agitator shaft, remove the 8 screws carefully the transmission holds 15Oz of 80-90 weight gear oil.
Check all the seals and replace as necessary.
Also see the following Whirlpool document on the transmission.
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/2550f737b3129b0c85256b0600504738/$FILE/787772%20%234.pdf
Overall, its a lot less expensive to replace a couple of seals than to replace a $170 gearcase.
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