The Sears power propelled mower resembles a push mower that is self propelled. When you want to change the drive belt on this particular type of mower, the key to this task is removing the blade adapter. Located beneath the deck of the lawn mower, it is an extension of the blade driveshaft which has been pressed on and then positively fastened by a central nut. Having this adapter makes it very convenient to use any blade for any purpose that you choose. However, when the drive belt breaks, there is no simple way to replace it unless you remove the blade adapter.
Place the front wheels of the lawnmower up on the ramps or concrete blocks. This gives you adequate clearance to work under the deck.
Attach the correct sized socket onto your ratchet, usually 9/16 inch but this can vary from model to model. Remove the bolts that hold the blade onto the adapter in a counterclockwise rotation. When using a wrench, use the box or closed end for this task.
Attach the prongs on your gear puller to the edges of the adapter. They will grab on like little grappling hooks. Tighten it up with the center bolt using your fingers and turning clockwise so all the prongs grip in symmetrical contact with the adapter.
Attach the correct wrench or socket to the center bolt and begin tightening it up. This action tightens the puller and will begin to pull on and therefore loosen the adapter.
Turn the bolt slowly but steadily. It may take a little bit of elbow grease to do this, but keep turning and eventually the adapter will give way and come off.
Pull the old belt off the drive pulley and pull it off the power pulley attached to the front wheels. Loop a new belt over the power pulley and the drive pulley.
Lubricate the drive shaft where the blade adapter was attached. Then using your hammer, lightly tap the blade adapter back into place. It may take quite a few taps, but it will go on. Once it is in place, reverse the steps to put everything back together.