Some repair / testing tips to verify this is the part you need:
If you turn your dryer on and hear a hum from the motor you may need to replace the motor. If you hit start and don't hear anything there could be a number of things to choose from. If you do hear a hum first open the dryer door, reach in, and manually spin the drum to verify that nothing is stopping the motor or drum from turning. If it spins freely the motor is most likely your problem. Although that is sufficient enough of a test, i know some people like me, believe in being thorough. For those like me you will need to unplug the dryer and remove the 2 phillips head screws located under the lint trap cover. Now put your knee on the front of the dryer, pull on the top cover while lifting at the same time until your able to lift the top cover up and out of the way. You will need a 5/16" nut driver to remove the screws on the left and right side of the drum holding the front panel on. You will need a small flathead screwdriver to undo the harness to the door switch. Once everything is undone you can lift the front panel up and place it out of the way. Release the tension on the belt, remove it, and pull the drum out. Now that there is nothing attached to the motor, again just for verification, manually spin the motor to make sure that there is nothing restricting the motor from turning. Now you can jump the two wires that run to the door switch harness, make sure nothing is grounded, plug the dryer back in, and start a cycle. If you still get a hum from the motor with nothing attached to it then replace the motor. You can also test for 240 vac at the 2 large guage wires to verify the motor is getting the correct amount of power with the dryer turned on.
Once you have your new motor you will need to follow all of the steps above to get to the motor inside the cabinet. You will also need to remove the vent from the back and get your dryer into the open so it's easier to work with. Remove all of the screws holding the back panel on and place it out of the way. Looking from the back, on the left is a black blower housing. Remove the 4 screws from the housing and place it out of the way. Inside the cabinet you will need a pair of vice grips fastened to the shaft of the motor where the belt pulley is located. Once you have the vice grips in place get back around to the blower in the back and with some force turn the blower clockwise until it breaks loose. Once you've removed the blower from the motor, undo the clips inside the cabinet holding the motor in place, and reverse the steps to install your new motor.
Here is a video that shows you how to get to the motor to change it:
Whirlpool Dryer Motor 279827
Whirlpool dryer motor 279827 fits Whirlpool dryers and all like makes and models. Our cost is $66.00, has a 1 year warranty, and free shipping! Give us a call anytime during our business hours are Monday - Friday 9 A.M. - 5 P.M., and Saturday 9 A.M. - 12 P.M. eastern standard time and we can help you with any questions. You can also submit any questions to our on line form on our contact us page we will get back to you as soon as possible.