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Small Engines (Lawn Mowers, etc.)/How to replace the flywheel on a Cub Cadet 12A-18MCO56



I tried to start my mower. When I pulled the start cord it was obvious something was wrong - the cord played out and rewound however, the flywheel was not being engaged and the engine was not turning over.I removed the engine shroud and discovered the center of the flywheel, where the main nut is located, was cracked and broken off in several areas. How do I replace the flywheel on a Cub cadet 12A-18MCO56? Is it fairly easy?  Do I need a puller to remove it? Thank you for taking time to address my issue.

Scott Ebert

What brand of engine is on the mower?

You should use have a flywheel puller to remove the flywheel...but if the old flywheel is cracked and had to be replaced you may be able to get by with out one.

The question I would really ask is why is the flywheel cracked?  Flywheels rarely crack.


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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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