Washing machine - Will not agitate
Here's the Sears Help for your washer if it "Won’t agitate or spin."  

It says it could be:


The lid lock switch
The washer drive motor
The washer timer


They also have blown-up diagrams of each assembly.  You can buy the replacement parts there.  (Or get the part number and search online.)

You can find the wiring diagram and user manual (not the repair manual) here.

Here is the service manual.  It is $9.95.  I haven't verified the helpfulness of this.