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This video from Sears PartsDirect shows how to replace a transmission on a walk-behind lawn mower. The transmission rotates the axle to drive the wheels and move the mower forward. The drive cable pushes the transmission forward to engage the drive belt and spin the transmission pulley when you pull the drive lever up on the mower handle. Replace the transmission if it's locked up or won't drive the wheels when engaged. Visit us at: http://www.searspartsdirect.com/?sid=soc:fb:replacing-the-trans

This video from Sears PartsDirect shows how to replace a carburetor on a lawn mower. Located on the side of the engine block, the carburetor mixes air with fuel to form a combustible mixture that enters the cylinder and ignites to drive the piston. The engine won't start or won't run smoothly if the carburetor gets clogged or damaged. If the carburetor is defective, replace it using the steps in this video. Visit us at: http://www.searspartsdirect.com/?sid=soc:fb:replacing-the-carburetor-on-a-la