Check to see if the washer will agitate. Your details imply that the washer is draining. If it will not agitate or drain even though the motor is running (humming) and the washer drains okay, then you likely have a broken motor coupler in the washer. The motor coupler is shown in the bottom of the second image below. I provided the procedure for accessing this part. If you suspect that this is the problem with your washer, you can use the procedure shown below to access the motor coupler and check it. If it is broken, you can order a new motor coupler from the
website. The part number for the motor coupler is 285852A. Replace the motor coupler and reassemble the washer to fix this type of problem.
If the washer agitates and drains but will not spin, you could have a problem with the transmission, clutch, the basket drive, timer or the drive block. If you need more help, resubmit your question with additional details and the full model number of your Maytag Centennial washer.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services