Question about John Deere 420,1020,2010,2020,2510,2520 Tractor Float

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I have a John Deere 420 garden tractor it wont shift from high to low range, also the throttle ramps high to low it sounds like the thing is gonna blow up,I have cleaned the carb what's next?

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Check just above the idle fuel mixture screw on the front side of carb and see if the 1/4 inch welch plug blew out of carb.You should see a hole if its blown out of housing,if still there you would barely make out its location,these blow out for 2 reasons,using compressed air to clean carb and a back fire through maniforld.If still have problem I would suspect a split intake manifold near where it goes into block causing an air leak.Both of these are common problems.

Posted on May 05, 2010

  • Bill
    Bill May 05, 2010

    Forgot about the 2 speed.With engine off,you on the seat,with right hand pull back on lever towards the seat then over to high or low.Ours has a lock out that didnt start to work {pull back then over} until other parts started to wear out.



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