washer will not spin, replaced coupler,drive block ok motor spin

Check the drive belt. Check the door switch with a multimeter.

Clutch

If the washer won't spin, the clutch assembly might be worn out. The clutch assembly makes the connection between the transmission and the inner tub. It is designed to allow the tub to get up to the proper spin speed gradually. As the clutch wears out it may prevent the tub from spinning. The clutch is not repairable, if it is loud or not working properly it will need to be replaced.

Drive Pulley

If the washer won't spin then the drive pulley might be worn out, seized, or damaged. Remove the drive pulley and inspect it carefully. If it is damaged or defective replace it.

Clutch Band kit

If the washer won't spin, the clutch band kit might be worn out. The clutch makes the connection between the transmission and the inner tub. It is designed to allow the tub to get up to the proper spin speed gradually. As the clutch wears out it may prevent the tub from spinning. If the washer won't spin, this clutch band kit may need to be replaced.

Tub Bearing

If the washer won't spin the tub bearing might have seized. This is a common problem and relatively easy to replace.

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Tub Seal and Bearing Kit

If the washer won't spin the tub seal and bearing might have seized. This is a common problem and relatively easy to replace.