DescriptionThis video provides step-by-step repair instructions for replacing the drive belt on a Troy-Bilt lawn mower (model 12AVB2RQ766). The most common reason for replacing this part is if the blade is not spinning or the self driving feature is not working.
All of the information for this replacement video is applicable to the following brands:
Troy-Bilt
Step-By-Step Instructions1
Troy-bilt Lawn Mower - Model 12AVB2RQ766
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Lawn Mower Drive Belt Replacement
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Tools & Assistance Needed
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You will need a 3/8th inch socket, a 5/8th inch socket, torque wrench, and a blade removal tool for this procedure, and you may need assistance.
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Before you begin, confirm the engine has cooled.
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Be sure there is little or no fuel in the tank.
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For safety, detach the ignition coil wire from the spark plug to prevent the engine from accidentally starting.
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Now tip the lawn mower back and use a weight to hold the handle assembly down.
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Use the 3/8th inch socket to unthread the seven lower screws securing the front transmission cover.
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Next, unthread the two upper screws securing the cover.
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Pull the wheel adjustment lever outward so you can fully detach the cover.
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Detach the belt guard, and release the belt from the drive pulley.
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Use a wood block or the blade removal tool to secure the blade.
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Use the 5/8th inch socket to unthread the bolt securing the blade adapter and blade.
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Set the blade and mounting plate aside.
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Use the 3/8th inch socket to unthread the two mounting screws securing the engine housing.
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With screws unthreaded, you can fully remove the housing, blade adapter and the old belt.
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To install the new drive belt, feed it through the deck and loop it onto the drive pulley.
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Next, reposition the blade adapter on the drive shaft and loop the belt onto the adapter pulley.
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Realign the engine housing by inserting the tab into the belt slot in the deck as you position it over the blade adapter.
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Rethread the mounting screws to secure.
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With the cutting edge facing downward, realign the blade on the adapter, reposition the plate and thread the bolt.
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Use the torque wrench to torque the bolt to manufacturer?s specifications to fully secure the blade, then remove the wood block or blade removal tool.
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Confirm the new belt is properly aligned on the drive pulley, and replace the belt guard.
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Hold the axle assembly in place as you insert the transmission cover tab under the belt slot in the deck.
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Make sure the drive cable is positioned in the notch in the cover.
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Pull the wheel adjustment lever outward to properly align the front of the cover.
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Replace the nine screws to secure the cover, starting with the lower middle screw.
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Remove the weight and return the lawn mower to its upright position.
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Reattach the ignition coil wire to the spark plug, and refill the fuel tank if necessary.
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Congrats! Your lawn mower is ready for use.