Question about Makita Tools 18V 1/2" Lxt Lithium - Ion Hammer Driver - Drill Kit - BHP451

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Maikita bhp 451 transmissions - Makita Tools 18V 1/2" Lxt Lithium - Ion Hammer Driver - Drill Kit - BHP451

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  • ben_kash Nov 02, 2008

    The transmission is toast on my drill and I didn't punish it at all.  This is the third time this has happened since I purchased this tool.  

  • Anonymous Nov 21, 2008

    it makes noise and it doesn't turn

  • dwoodman Dec 01, 2008

    same problem for me. I tried the standard tricks to remove the chuck but nothing works.Any suggestions?

  • Anonymous Dec 05, 2008

    3rd gear doesnt spin when pressure is put on it

  • ben_kash Mar 10, 2009

    I had  to get creative I bought a new drill from Home Depot returned the tool and used the new reciept to get the repair with the improved trans.

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The gearbox is good,what the problem is,is the nylon speed change ring that goes on the outside of the gearbox that takes the power of the gearbox,the end of the teeth,about 2mm or less strip making only noise when in 2nd or 3rd gear,,they sell it with the new gearbox and charge you,,,,,but you can buy it separatly,,,the part no.419558-2,,pick key 01820914

Posted on May 21, 2010

  • donna_ch8 Aug 26, 2010

    If you have repaired your BHP 451, could you tell me where the 2 small pins go when reassembling it? We can't find any gear assembly diagrams

  • Mani kurian
    Mani kurian Dec 03, 2013

    it goes on the plastic ring which has the speed selector.

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Yer Makita 451 is doggy tool i have 3 with gear box problems. Duds

Posted on Nov 27, 2009

  • Mani kurian
    Mani kurian Dec 03, 2013

    sell it on e-bay, can get up to 15.00 to 20.00 pounds.

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I had the same problem with my 451, after some research and with a exploded parts list i found that makita have an improved replacement gearbox assembly, The part number is 125430-5 Gear assembly and you will also need to replace the change lever, part 125435-5 total price inc delivery was $91.80 inc delivery from Syd Wilson electrics. syd2@iinet.net.au.

Posted on Dec 21, 2008

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You also might want to consider just buying a new drill-only replacement (currently $118.80 at Tyler Tool: tylertool.com/makita). Comes with a new three year warranty, so you can send it back to be repaired by Makita next time.

Posted on Mar 10, 2009

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