Question about Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag

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I have a CMM1200 19" 24 volt cordless mower that is two years old. It seems to charge just fine but when I insert the key and go to turn it on, only the blade goes around with almost no sound. The engine doesn't seem to "catch".

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  • Julie King
    Julie King Apr 26, 2012

    The nut does not turn either way, but the blade spins freely. What next?

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Hello. It sounds like the nut holding the blade tight to the shaft is loose. With the mower unplugged and off, with the key removed, do this. lift up the mower so that you can spin the blade manually. It should not spin freely, it should be hard to spin because if the bolt is tight you would be spinning the blade and the motor. If it is loose, get a wrench that will fit the nut and then hold the blade in place with a short piece of lumber [like a 24 inch piece of 2x4] and tighten the bolt. J.

Posted on Aug 28, 2010

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1 Answer

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I think you should check the charging system. You said you replaced the battery a few weeks ago. Even with the charging system not working, the battery might have enough power for a dozen or more start-ups; but using the lights may have drained what power was left. Get or borrow a battery charger and charge your battery. If mower then seems to be working fine, measure the voltage across the battery when the mower engine is running at normal speed (not idling). It should be 13.5 volts or more if the charging system is working. 12 volts or less means it's probably not working. Either test or replace the regulator/rectifier. Please rate me if you think this helped, thanks!

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After charging the mower, you must place the safety key in the mower before it will start. On models that have a bail handle, be sure to pull the bail handle back to the mower handle before engaging the start lever. If your mower still does not start, remove the safety key and ensure the bail and start lever are in the "off" position. Then firmly re-insert the safety key, pull the bail handle to the mower handle and engage the start lever.

Note - It is important that the bail and start lever are returned to the "off" position before inserting the safety key.
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