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

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  • Anonymous Jun 25, 2008

    1st & 2nd gear okay, 3rd gear slipping does anybody now how to solve this problem.

  • mountainmen Dec 22, 2008

    Looks like a common problem, try getting Makita to replace the gearbox as it would appear to be a common fault.
    Have a look at the faulty part with this link. (can't buy this bit, whole gearbox $40 in USA or in the UK £50-60).

  • chuzoo Apr 25, 2009

    Have the same problem with my Makita BHP 451. Took apart the gear box and only part that looks like it could fail is a plastic sleeve which slides back and forth and engages the various gear clusters. I guess if this gets sloppy it might not fully engage the high speed cluster which may cause drill to slip. Just a guess though. From parts lists looks like you have to replace the entire gear box.


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