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What causes my washer to lock-up on the spin cycle with motor still on?

What causes the pulleys to lock-up when it comes to the spin cycle? I've replaced the belt and the switch that locks the lid, when the spin cycle starts. It fills, agitates and drains fine - it just won't spin and the motor is still going and starts smelling in a short time like something's burning.
PK, February 2012
On what. Make & model needed if you want an answer.

Lincoln Appliance NZ, February 2012