Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Have you by chance had the release valves pulled recently and forgot to push them back in? The only other thing that I can think of that would make both sides not operate all of a sudden is if the belt is not tight enough allowing it to slip and not turn the transmission input pulleys.
I would check the spring on the idler pulley that holds tension on the drive belt as well as the belt itself. It would be really odd for both transmissions to go out or bad at the same time.
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