Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model
I had a similar problem with my Craftsman 42" lawn tractor with a Briggs and Stratton 17 HP engine. The problem turned out to be the solenoid valve on the bottom of the carburator. The valve shuts off the gas when you turn off the mower to stop backfire. After I replaced the valve, the mower is working like new.
Posted on Jun 01, 2013
When it stalls, does it die suddenly, as if you turned off the ignition? If so, there may be an electrical problem. Heat causes plastic circuit boards and connectors to expand, and if there's a crack it could open a circuit. One way to find it -- get a can of circuit chiller spray (like this). Run the tractor until it's hot, and stalls. Now spray various ignition parts, one-by-one, testing the tractor after each spray. I'd try the ignition switch, the relays, and the connectors around those. If it seems to fix it, repeat the experiment to be sure. Then replace the bad part.
If it stalls gradually, like it's being dragged down, then it could be mechanical friction - like a bearing or shaft that's heating up and expanding. If you drive around without the blades on, does this still happen? If so, that eliminates the mower deck with its spindles and pulleys as a cause, and suggests it could be the engine. Good luck!
Posted on Jun 05, 2010
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Posted on Jan 02, 2017
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