Not washing but spins

I am not familiar with the Samsung line of washers and could not find yours with that model number. But in general here are the primary causes for a washer not to agitate:

Cause 1

Agitator Repair Kit

If the washer won't agitate, replacing the agitator repair kit may solve the problem. The kit contains the agitator components that are most likely to wear out and/or fail. If any of the parts are worn out, stripped, or damaged, replace the kit.

Cause 2

Drive Block or Bell

The drive block connects the washer transmission to the agitator. If the drive block is worn out, the transmission shaft will still move back and forth, but the agitator will only move slightly or will not move at all. Inspect the drive block for damage. If the drive block is worn out, stripped, or damaged, replace it.

Cause 3

Motor Coupling

The motor coupling connects the motor to the washer transmission. If the washer is overloaded, the motor coupling will fail in order to protect both the motor and transmission. The motor coupling can also fail due to normal wear. Inspect the motor coupling to determine if it is broken. If the motor coupling is broken, replace it.