How to troubleshoot washing machine motor?

If you suspect a problem because your washing machine will not finish a cycle; try unloading the machine even if everything is wet, run another small cycle without any clothes and set for low water, no soap. See if it goes through the entire cycle. If it does then the motor is probably the problem. If it does not than you may have just stripped out the "Washing Machine Coupler." (see picture link below) NOTE: The part is cheap and may be fixed by a handy person.