Replacing the Drive Belt on a Lawn Mower

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This video from Sears PartsDirect shows how to replace a drive belt on a lawn mower. The drive belt connects the crankshaft pulley to the transmission pulley. The transmission rotates the wheels to propel the mower. The mower won't move with a broken or worn drive belt. You can replace the drive belt using the steps in this video.

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The video includes these parts. Look up your model to make sure you get the right parts for your lawn mower.
Drive belt
http://www.searspartsdirect.com/part-number/954-04259A/0071/247.html?sid=soc:youtube:direct-part-link

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Transcript:
The drive belt connects the crankshaft pulley to the transmission pulley. The transmission rotates the wheels to propel the mower. The mower won't move with a broken or worn drive belt. You can replace the drive belt using the steps in this video. Let the engine cool. Wear work gloves to protect your hands. Now, let’s get started. Disconnect the spark plug wire from the spark plug. Remove the fuel tank cap. Place a plastic bag over the fuel tank opening and reinstall the fuel tank cap to prevent gasoline from leaking out through the fuel tank cap vent. Tilt the mower back to lift the front wheels then secure the mower handle to your worktable to hold the mower steady. Wedge a block of wood between the mower blade and the deck to keep the blade from turning when you loosen the blade bolt. Loosen and unthread the blade bolt while holding the cutting blade to keep it from falling. Pull the blade, blade support and blade bolt off the crankshaft. Remove the bottom drive cover mounting screws. Remove the debris shield mounting bolts and pull off the debris shield. Roll the drive belt off the crankshaft pulley, toward the engine. Pull the crankshaft pulley off and free the belt from the crankshaft. Release the clamp from the mower handle and lower the mower to the upright position. Remove the top drive cover mounting screws. Release the height adjuster lever and pull the drive cover off. Pull off the belt keeper from the top of the transmission. Release the drive belt from the transmission pulley and remove it. Push the drive belt through the deck opening and install the new drive belt on the transmission pulley. Reinstall the belt keeper on the transmission. Insert the drive cover tab into the deck slot by the engine and position the drive cover on the deck tray. Reconnect the height adjuster lever to the drive cover. Reinstall the top drive cover mounting screws. Tilt the mower back to lift the front wheels, then clamp the mower handle to your worktable to hold the mower steady. Route the drive belt over the crankshaft. Align the crankshaft pulley shaft indentions with the slot and slide the pulley onto the crankshaft. Roll the drive belt onto the crankshaft pulley. Push the debris shield tab through the deck opening and reinstall the debris shield. Reinstall the debris shield mounting bolts. Reinstall the bottom drive cover mounting screws. Position the blade, blade support and blade bolt on the crankshaft and hand-tighten the blade bolt into the crankshaft. Wedge a block of wood between the mower blade and the deck. Use a torque wrench to tighten the blade bolt. Remove the wood block from the cutting blade. Release the mower handle from the worktable and tilt the mower upright. Remove the plastic bag from the fuel tank opening and reinstall the fuel tank cap. Reconnect the spark plug wire to the spark plug.
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