Many residential walk behind lawn mowers include a safety feature known as a blade brake clutch system. Blade brake clutch systems allow the mower engine to continue running even when the blade is stationary. This feature comes in handy if you want to move the mower from one point to another without cutting the grass in between or having to restart the engine. If the clutch brake malfunctions or fails, you can remove it from the mower for repair or replacement.
Things You'll Need
- Plastic bag
- Piston stop
- Adjustable or open-end wrench
- Socket wrench
- Clutch retaining tool
- Jaw-style puller tool
- Hex-head screwdriver
Remove the spark plug to prevent the mower from accidentally starting during the repair process. Take off the gas cap and cover the fuel tank opening with a plastic bag. Replace the gas cap and screw it down tightly.
Find the clevis and actuator arm components on the top deck of the mower. Remove the cotter and clevis pins from the clevis, and slide the clevis from the actuator arm. Unhook the return spring. Insert a piston stop into the spark plug hole.
Turn the mower on its side to access the blade and muffler components. Remove the bolts securing the blade and muffler; the number and type of bolts varies by brand and model. Set the removed components aside.
Remove the socket head screw, lock washer and flat washer at the center of the clutch brake assembly. Insert a clutch retaining tool into the crankshaft.
Use a jaw-style puller tool to remove the clutch brake assembly from the crankshaft. Set the removed clutch brake assembly on a padded surface.
Remove the shoulder screws and pressure springs on the brake plate, using a hex-head screwdriver. Remove the brake plate and place it with the other removed components.
Use the jaw-style puller tool to remove the actuator and arm assembly. Remove the clutch brake housing.
Tips & Warnings
- Reverse the process to replace the removed mower components. Take the plastic bag off of the fuel tank opening before operating the mower.
- Unauthorized user repairs may void the warranty on your mower. Consult your warranty agreement for more information.
- Walk-Behind Lawn Mower Service Manual; Clymer Publishing
- Toro: Walk Behind Power Motor Drive Systems Service Manual
- Toro: Blade Brake Clutch System Service Manual
- Photo Credit Thinkstock/Comstock/Getty Images