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Murray 42inch, 18hp, riding mower(about 7 yrs old) quits when I engage the blade. Also lately will quit running mid stream through cutting. I cleaned the air filter, changed the oil, have yet to check the spark plug. Has plenty of fresh gasoline. Starts up cold just fine. Once it shuts down I have to let it cool before I can start it again. That's when I try to engage the blade w/out any success.

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  • Barney_ro353 Aug 04, 2010

    Sounds like 2 problems here. First, if its runnin gthen just shuts down, may need to replace the coil. (Thats whats at the end of the sparkplug) To set it after replacing, use a business card to put inbetween the coil & the flywheel for the gap setting. ALso, check the safety switch for the blade engager. I have one & when I put it in reverse, the engine will kill

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  • Garden Master
  • 473 Answers

Blade switch is bad or dust collection has made it inoperable, believe it is located beneath your left foot under floorboard, very hard to access. If you can get to it blow out thoroughly with compressed air. If that does not work u will have to replace.

Posted on Aug 09, 2017

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I have a Scotts _ John Deere law mower tractor model S2048-S2554 Serial number 020-001, the engine runs but sounds like it is going to die or it needs air --- it runs unnevenly

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SOURCE: Craftsman riding mower starts rides a few minutes then stops

Make sure that when you check the oil that the mower has sat I say for at least 5mins. Your mower might have an oil sencer. If not I think it might be the coil gettin hot and shorting out.

Posted on Aug 23, 2009

  • 1 Answer

SOURCE: I have a 15.5 HP Sears Craftsman 42

I'm betting that you need a new safety kill switch - probably the one underneath the seat (the spring-loaded plunger switch that won't let you use the machine without your *** in the seat). Could also be the one behind the "dash" that is associated with the blade engagement mechanism.

I know that the under-seat-switch cannot be bypassed or it will disable the machine in the exact way that you described. Why do I say this? Because I just tried to bypass my own "***-in-the-seat-safety-switch" on my very own 15.5 HP, 42" Sears tractor, and it responded by punishing me - the absense of the switch caused the motor to cut out when I tried to put the machine in gear AND/OR engage the blade. It seems to have some measured capacitance - the absense of same seeming to interrupt the ignition timing enough to shut the motor down when you attempt to get anywhere past neutral or engage the blade. These "safety" switches may be needed by a very few who prefer to be drunk while they mow lawns on steep slopes that their tractor mowers were not designed for, but I find these items to be troublesome and enfuriating. My trees shed a lot of sticks in high winds, and I can't stand shutting the machine down and restarting it EVERY SINGLE TIME I have to dismount to clear sticks or other obstructions out of my mowing path. This is an obnoxious, "nanny-design" feature that desparately needs to be discontinued. It also makes both jump-starting the tractor and electrical troubleshooting much more difficult than they should be. The tractor should let you dismount without shutting down, as long as you have disengaged the blade and shifted into neutral. It should also let you jump start with jumper cables - impossible to do with your rear end in the seat. By the way, call Manufacturer's Supply, Inc. at 1-800-826-8563. They may have a replacement - their item number 31-9664 might do it, but talk to them first. I'm calling them tomorrow. Good luck.

Posted on May 17, 2010

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