Question about Makita Drills

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I Have a Makita 8406C core drill which Hums but wont turn., I have replaced the brushes and cleaned the armature but to no avail. I am looking for a wiring diagram for The makita 8406C or suggestions for repair. i see it hase some kind of controller which may be the fault but am unable to test further. All help appreciated. Ric

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  • 31 Answers

Can you turn the armeture? If not you may have a frosen bearing

Posted on Jan 17, 2014


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Posted on Jan 02, 2017

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SOURCE: wiring diagram for makita 6510 LVR drill

I can't find the wiring schematic online but if you can bear with me I will make some phone calls thurs. and get one faxed to me. It has been so long since I had one apart that I can't remember.

Posted on Feb 11, 2009

  • 14 Answers

SOURCE: makita core drill model8406

Hi the 8406 was common for the intermediat gear to go have you yet stripped the gear box?
Quick test wear gloves to do this!
Turn on the drill if the chuck does not turn spin the chuck with a gloved hand TAKE CARE!! if the chuck catches grip one of the gears are gone.
Hope this helps let me know. Sean

Posted on Mar 04, 2008

SOURCE: Makita drill 6349D

dont think its

Posted on Oct 05, 2008

  • 1 Answer

SOURCE: Makita BHP451 Question

go with the hitachi, i've had 4 makita drills all with gearbox slipping. expensive to fix.

Posted on Feb 16, 2009

  • 154 Answers

SOURCE: how to properly clean armature on cb748 core

If you are getting arcing on the brushes then most likely the armauture has failed and cleaning will not cure the problem. If the unit has been run with the brushes sparking for a while the field coil may also be faulty. Best thing at this point is to dismantle the unit and take the armature and field in for testing or take it to a Dewalt service center for repair.

Posted on Aug 05, 2009

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It is very common for the armature to overheat and melt down.

Open it up and inspect the armature, it will be very obvious it is burnt.
If it is the case, replace the brushes (#16) and the armature(#14)
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If the tool is 'ticking' or 'grinding' when it spins check the condition of the armature before you install new brushes - the copper commutator should not look burnt or have raised segments - this is also a common repair on this tool. Replacing the armature is a fairly inexpensive and easy fix - you must split the entire clamshell housing to access this - be sure to fit all the components securely back into their slots or you may tear all the fan blades off the armature when you try and run it.

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It could be your brushes are worn down and not fully contacting the armature. If they are very short and the armature comutator looks burnt, you need part number CB424 to replace your brushes. Most likely your problem is the switch. Sometimes the contacts in the switch get dirty or burnt and if you move the switch just right, a clean contact may be made but usually it won't work. The switch is part number 651939-6. Both are available on sites like

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first measure of the batterie if its loaden ,only if the brushes are to short replace also anyway the armature and brushes BOTH . it is not good to switch only the carbonbrushes because of a marketing technical design concept because of the heat dissipation that playing tricks insite the armature and it is cheap made by Johnson
sometimes the half value compared to other brandnames.

Armatures are new designed in a short time

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Hi there,
This is simple to fix.It sounds like you need to replace the brushes.There are two types of brushes ones that are easy to change and one that have small holes in the front part of the brush housing that require a small piece of wire that runs through the holes and keeps the brushes in place for reassembly.The wires length will depend on the vent that is used to pull the wire out when the armature is back in place and the front piece is bolted back together.While the armature is out blow everything down with compressed air and use a hacksaw blade to clean the grooves between the metal plates on the armature and add a thin coating of grease to both ends of the armature If they need it you might want to clean out the holes that the armature ends seat in.Thank you for choosing and Good Luck!

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Remove the brush caps and have a look at the brush length.
If they are extremely short, or barely touching the commutator bars on the armature, you will need to purchase a brush set part # (193466-2). The way you are describing it behaving without a load, and charged battery, I can only assume this will fix it. The other thing you can do is open the clamshell housing and with a pick, attempt to move the armature fan and see if it will make several full rotations. I want to know if a piece of the magnet ring broke loose and is rolling around between the armature and the magnet ring causing your varying RPM.

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