DescriptionThis video provides step-by-step instructions for replacing the alternator on Briggs and Stratton small engines, commonly found in Toro, John Deere, Lawn Boy, and Craftsman riding lawn mowers. The most common reason for replacing the alternator is when the battery keeps draining.
All of the information in this alternator replacement video is applicable to the following brands: Briggs & Stratton, Toro, John Deere, Lawn Boy, Craftsman
Tools used: 1/4” socket or nut driver, 3/8” socket or nut driver, flat-head screwdriver, 15/16” socket and pipe wrench, flywheel puller, torque wrench
Step-By-Step Instructions1
In this video, we will show one or more of these icons to alert you when to use caution before you replace the alternator in your engine.
2
Make sure the engine has cooled, the ignition switch is in the off position, and the key has been removed if applicable.
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If necessary, disconnect the headlight wire harness.
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Then, lift up the hood or engine cover and detach it.
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Now, rotate the air filter cover retaining knobs counterclockwise and pull off the cover.
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Lift out the air filter.
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Use a quarter-inch socket or nut driver to unthread the screw inside the filter housing.
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Now, use a 3/8 inch socket or wrench to unthread the four blower housing mounting bolts.
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Detach the oil drain tube and lift off the blower housing.
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Use a flathead screwdriver to pry off the screen assembly cap.
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Next, use a pipe wrench to secure the drive pulley and a fifteen-sixteenth inch socket to unthread the flywheel mounting bolt.
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Remove the bolt and lift off the screen assembly and washer.
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Lift off the flywheel fan.
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Rethread the bolt and use a flywheel puller to help detach the flywheel.
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Unthread the bolt and lift off the flywheel.
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Use the quarter-inch socket or nut driver to unthread the screws securing the alternator.
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Disconnect the alternator wire connector and release the wires from the retainers.
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To remove the old alternator, install the new alternator by positioning it on the engine.
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Replace the screws to secure, line the wires and the retainers, and connect the wire connector.
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Aligning the notch in the flywheel with the slot in the crankshaft, reposition the flywheel.
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Insert the flywheel key into the slot and push it into place.
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Realign the flywheel fan.
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Replace the screen assembly.
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Make sure the washer is in place, then rethread the flywheel mounting bolt.
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Torque the bolt to one hundred foot-pounds.
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Snap the cap into place.
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Reposition the blower housing.
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Make sure the housing is properly seated on the air diverter.
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Rethread and tighten the mounting bolts to secure the housing.
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The longer bolts go in the back.
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Replace the screw in the filter housing.
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Reposition the air filter.
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Realign the cover and rotate the retaining knobs clockwise to secure.
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Reattach the oil drain tube to the blower housing.
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Reinstall the hood or engine cover and reconnect the headlight wire harness if applicable.