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

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My makita 18v battery drill slips on 3rd gear whats the cause on it , or can you please send me a free copy of repair manual? thanks.

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Gears slip when drilling in all speeds although 3rd is the worst it applies to al setting settings as well screw, drill, or hammer. i've taken it apart the gears and visible parts are all fine none are...


As long as the shifter is fully engaging then you will need to replace the transmission. It comes as one complete assembly. Here is a diagram with part numbers. The trans is part #125433-9 (reference number 12) and is just over $53

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/makita/BDF451

Jul 12, 2011 | Makita BDF451Z 18V Lxt Lithium Ion 1/2"...

1 Answer

My makita impact driver has lost power. it seems to be using the hammer much more and seems to be slipping. both the hammer and the andvil don't appear worn. the bushes are fine. what could be the problem?


This is more then likely caused by the plastic gears inside the drill wearing down. Makita may replace/repair under warranty depending on when you purchased the drill.

Mar 18, 2011 | Makita 18V LXT Lithium - Ion Cordless...

2 Answers

18v makita batteries will not charge anymore, can they be repaired?


Hello successfulpl, those batteries can not be repaired, but, they can be, and should be recycled.

Jan 13, 2011 | Makita 2 Bl1830 18v Battery,dc18ra Charger...

1 Answer

Makita 8444d second and third gears sound noisy and do not engage


I had the same problem on my 8444, it was out of warranty (just over 2 years old) so I stripped it and found the plastic gear selector ring worn out. Was livid at this as these drills are marketed on the strength of the "all metal" MXT gearbox! Makita UK, to their credit, sent me a replacement gearbox free of charge when I pointed this out to them.

A year on and the replacement gearbox has now started doing the same in 3rd (high) gear. Doubt I can get another free 'box out of Makita (they would probably say I fitted it incorrectly) so am looking at buying just the drill body, which comes out at around £60 and will work with my existing batteries. Just not sure if I would trust the replacement not to fail, but a similarly powerful drill with 2 batteries would cost me wel over £200.

Jul 20, 2010 | Makita 6349DWDE 18V 1/2" MXT Driver -...

3 Answers

MAKITA LXT BL1830 18V LITHIUM-ION 3.0AH BATTERY


If the charge count on the batteries is under 300, Makita will replace them. Makita has a known defect in this battery that causes the battery to shut down before it is dead. So as of now they are exchanging ones with low use.

If they are truly defective and makita won't replace, you have to open them, find the dead cell or blown fuse, and replace. Search youtube makita battery for a video on repairing this battery. But once the red and green lights on the charger flash, the the battery can't be charged on a Makita charger -- it's been locked. So use a third party charger.

Apr 18, 2010 | Makita 2 Bl1830 18v Battery,dc18ra Charger...

1 Answer

Hi I have a makita drill 18 volt. I lent the drill to a friend and got it back not working properly. When I squeeze the button, the motor is running but the head of the drill is not turning and doesn't...


Check the speed control. There is a speed control usually from hi to low... sounds like it's in between speeds... try adjusting it back and forth...
It should go back into one gear and work fine.

Oct 06, 2009 | Makita 2 Bl1830 18v Battery,dc18ra Charger...

1 Answer

18v makita bhp451 cordless hammer drill.clutch slipping


its prob stuck between gears one and two try a little wd40 on the gear selector switch

Jul 18, 2009 | Makita 12 Volt Cordless Drill/Driver Kit

1 Answer

3rd gear slips AGAIN!


A gear needs replacement.
Most likely the speed change ring.
It's a known defect on these drills.

Jul 05, 2009 | Makita Tools 18V 1/2" Lxt Lithium - Ion...

2 Answers

Clutch slipping on cordless drill. need spare parts to repair.


Are you sure you do not have a tourque adjustment problem. If not I do not believe Makita will want to send you parts,you would have to know what is precisely wrong and by the time you went back and forth you might as well find nearest dealer for repairs and google search Makita.com for service parts near you + zip code to get your drill fixed.

Thanks , Please rate jj505

Mar 28, 2009 | Makita 6349DWDE 18V 1/2" MXT Driver -...

4 Answers

Maikita bhp 451 transmissions


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

Nov 02, 2008 | Makita Tools 18V 1/2" Lxt Lithium - Ion...

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