How to Adjust a Belt Tensioner on a Toro Walk-Behind

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Toro walk-behind mowers use a rubber drive belt to propel the wheels. The mower has a tensioner adjustment mechanism to ensure the belt remains tight on the drive wheel and pulley assembly. A loose belt will not propel the mower effectively and may wear out prematurely from slipping on the metal drive wheel. Adjusting tension on the belt takes only a few minutes.

Shut off the Toro and wait for the engine to cool. Pull the spark plug wire off the tip of the plug on the engine block.

Take out the screws holding the belt guard cover over the drive mechanism. Remove the cover to expose the drive belt and tensioner.

Loosen the four handle bracket mounting screws on the tensioner. There are two screws on each side of the bracket surrounding the drive belt.

Loosen the screw on each side of the rear height adjuster bracket.

Slide both ends of the tensioner mechanism until the belt is taut on the pulley wheels.

Tighten all bracket screws with the screwdriver.

Engage the drive lever on the Toro. When pressing the center of the belt with your thumb, the belt should give less than 1/2 inch with proper tension.

Replace the belt guard cover and secure with the screws.

Attach the spark plug wire to the plug tip.

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