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Small Engines (Lawn Mowers, etc.)/Craftsman snow blower auger/traction interlock

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Question
I bought this machine brand new in 2001 and at that time the interlock system worked perfectly. Recently the interlock system failed to work. There is nothing in the manual about adjusting, fixing or parts. When I contacted searsparts direct they could not help me but directed me to another of their repair sites. This site could not help me only offered to set up an appointment with a field service technician. Being a retired manufacturing engineer and on a fixed budget I prefer to perform my own repairs. Any assistance that you can render would be greatly appreciated. Thank you. Joe.

Answer
What is the model number of the machine?  The model nubmer will be on sticker, about the size of a business card, usually located on the rear of the machine or under the handle or drive cover.  The model number format will be similar to xxx.xxxxxxx

Rarely do the manufactures provide schematics for outdoor power equipment.  This makes it challenging to identify which circuit is what as well as if a switch is normally open or closed.

How did the interlock use to work?  If you released the wheel drive or blower auger would the engine stop?

Have you traced the wires from the handle to the switch or switches?  

Eric

Small Engines (Lawn Mowers, etc.)

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Eric A. Jones

Expertise

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.

Experience

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.

Education/Credentials
MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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