Replacing a Blade Drive Belt on a Riding Lawn Mower. This video shows how to replace a blade drive belt on a riding lawn mower. The blade drive belt connects the engine pulley to the mower deck pulleys and spins the cutting blades. A worn blade belt won't spin the blades fast enough to cut the grass. A broken blade belt won't spin the blades at all. Examine the blade drive belt and replace it with a part that fits your model if you find damage or excessive wear.
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Blade drive belt
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The first step to replacing the blade drive belt is to turn the ignition switch off and remove the key. Lift the mower hood and disconnect the spark plug wire. Lower the mower deck to its lowest position. Disengage the cutting blades. Roll the blade belt off the engine pulley and release the belt from the belt keepers. Remove the front lift link support retaining pin and washer, and then detach the support from the deck. Remove the left suspension arm retaining clip and then detach the arm from the mower frame. Remove the left rear deck bracket retaining clip and washer and then release the bracket from the deck. Repeat the process on the other side of the deck to disconnect the right suspension arm and right rear deck bracket. Pull the deck out far enough to access the blade drive belt. Note the routing of the blade belt through the pulleys and belt keepers. Refer to the belt routing sticker on the deck or your owner's manual for guidance. Release the belt from the idler pulleys, belt keepers and mandrel pulleys. Pull the belt off the mower deck. Loop the new belt around both mandrel pulleys. Route the belt through the idler pulleys and belt keepers. Push the deck under the mower frame. Reconnect the front lift link support to the deck using the washer and retaining clip. Reconnect the left suspension arm and deck bracket using the washers and retaining clips. Repeat the process to reconnect the right suspension arm and deck bracket. Route the blade belt through the belt keepers and roll the blade belt onto the engine pulley. Reconnect the spark plug wire and lower the mower hood.
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