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lawn mower

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  • 17-06-2012 3:40pm
    #1
    dvae
    Registered Users Posts: 335 ✭✭


    every time i try to start my lawn mower i get a huge kick back, and the chord gets pulled from my hand at a 1000mph. the mower started fine yesterday. i am now afraid to pull the chord again as it nearly broke my wrist earlier. next time i will have to get someone to pull the chord, while i pretend to empty the grass box. icon10.gif
    has anyone got any ideas to what could be causing this.


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    #2
    Discodog
    Registered Users Posts: 15,897 ✭✭✭✭Discodog


    Sounds like the ratchet on the recoil starter is not releasing. Remove the 3 or 4 nuts that attach the starter. When you pull the cord you should see a peg protrude from the starter & then retract when you let go. Try giving it some lubrication.


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    #3
    jimmyw
    Registered Users Posts: 3,382 ✭✭✭jimmyw


    When you had the kick back, did it actually run? Possible one or both of the keys that stops the flywheel or the blade from spinning around on the crankshaft is designed to shear if the engine hits an unmoveable object to protect it.But usually when this happens, it messes up the timing, hence the kickback.


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    #4
    dvae
    Registered Users Posts: 335 ✭✭dvae


    jimmyw wrote: »
    When you had the kick back, did it actually run? Possible one or both of the keys that stops the flywheel or the blade from spinning around on the crankshaft is designed to shear if the engine hits an unmoveable object to protect it.But usually when this happens, it messes up the timing, hence the kickback.


    yea it did start, but ive since realized that the blade had come loose.
    after doing a bit of research ive discovered that this can cause the keys to break.
    is this a big job to fix myself? thanks


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    #5
    jimmyw
    Registered Users Posts: 3,382 ✭✭✭jimmyw


    The key might not be sheared then, when the blade is tightened up, it might be ok.If it is,no its not a big job, it fits in a slot in the shaft and this also corresponds to a slot in the blade/flywheel.There is also a washer on the blade that's designed to allow the blade to slip on the shaft, but only temporarily if it hits a softer object.But the material in the key must be the right quality, (soft alloy) to make sure it will shear.it must not be of a harder material.

    These will give you some idea

    http://i6.ebayimg.com/04/i/001/26/3c/451e_35.JPG

    http://0.tqn.com/w/experts/Small-Engines-Lawn-1746/2010/04/flywheel-view.jpg

    http://0.tqn.com/w/experts/Small-Engines-Lawn-1746/2010/07/Broken_1.jpg


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