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From what you have described your washer most likely has a bad clutch. You will also need to make sure your washer is draining completely. Here is a video that demonstrates gaining access to the clutch;
Always unplug or de-energize electrical equipment before removing covers or attempting service. Be careful and wear appropriate hand protection when working around sharp metal parts.
This video is for demonstration purposes only. The washer in this video may not look exactly like yours, but the procedure is basically the same.
I highly recommend having a trained service technician evaluate this problem. You can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
Here is a link that you may use to view the parts list diagram and for parts purchases;
Sears Parts Direct
I hope this is helpful. Check the things I have covered here, and if I may be of further assistance, include more details, in a reply to this post.