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Discussion Starter · #1 ·
Hi,

I had a mishap with my Makita RT0701C router and it burned up :(. I found the right replacement parts online but there are two looped coils, one that is attached to the field (see picture below) and one that is attached to an orange wire going to a wire nut that connects it to two white wires. I can't find these replacement coils and I don't know what they are called. Can anyone here tell me what they are called and if possible a part number or what to shop for?

I thank you for any help you can provide in advance.

Best Regards,
Edwin van Doorn
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No such part in the
RT0701C_PB_Breakdown_RT0701C_8-13.pdf file I just downloaded.

I am guessing it could be the " wire-wound resistor coil" inside of the potentiometer of the speed controller and the potentiometer could have also blown up.

Check with Makita.
 

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Welcome to the forum, Edwin.
 

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Discussion Starter · #6 ·
Hi All,
Looks like they come with the stator, and I would guess that they are to "ground" the rotor. View attachment 403866
Thank you Brian for posting this. I think the stator is the same as the field in the diagram I found on the Makita website although they aren't shown in that overview. I spoke to Makita today as well as to a local repair shop for Makita (found on their website) but neither recognized the parts or could tell me which part they should come with. I do have to replace the field so I'll order that and see if it comes with the coils. If not, I'll probably hobby-Bob something together since I don't see any use for those coils other than being removable as opposed to being soldered on. I think I can achieve the same think with a small connector and the other end soldered to the brush holder. I have nothing to lose so I'm simply going to try that once the other parts come in.

To Reuelt, thank you for your input but it's definitely not part of the speed pot since that part is still funtional and undamaged.

To JW2170 and Old55, thank you for your warm welcome messages.
 

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I would tend to agree with Reuelt about the coils (when intact) being the contacts connecting the brushholders to the rest of the unit. No experience with the unit in question, but it has been a fairly common practice with lower powered brushed motors for a long time as it distributes the current around the brush holder fairly evenly to eliminate hot spots. Look at the brushholders inside the housing, if they are circular in section outside with a rectangular or square hole broached through for the carbon brushes, and have a machined semicircular recess around the outside, the coil slides over the brushholder body and into the recess.

Beware that if the field winding/stator can be installed in two orientations, and the coils land close to and ready to connect to the brushholders, the orientation will be important, and getting it wrong may reverse the direction of rotation of the spindle, remove collets, collet nuts etc before attempting to power up the first time after reassembly to avoid the spindle throwing these parts off. If the field winding/stator is asymmetrical or has something to index it into the housing so it can only go in in one position, reverse rotation shouldn't be an issue.

If the coils are the contacts for the brushholders, given the damage shown in the picture, there is a good hance that at least one armature winding is fried and a short circuit. If that is the case, a replacement machine maybe a cheaper option than buying parts to rebuild your unit. Investigate your armature before committing to buying parts.
 

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Discussion Starter · #9 ·
Thank you Reuel for the diagram. How is your experience with the clone router? Those are certainly cheaper than the original.

Malb, thank you for your insights. I'll definitely keep the polarization in mind. I did mark the field and bracket to identify the orientation of the field and identify the location of each coil. I'm still wondering why nobody (including Makita Tech Support) knows how to obtain the coils... I found that fix.com sells the armature and the field for a total of about $50 and other sites that are quite a bit less than that so rebuilding the original Makita router is still cheaper even than buying a clone. I did get a new router already to keep moving forward but want to keep the repaired one as a spare.

Best Regards,
Edwin
 

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Thank you Reuel for the diagram. How is your experience with the clone router? Those are certainly cheaper than the original.
Sorry, I must have uploaded the wrong file (deleted now)
Attached is the correct one with all the names.

The clone router works OK. Came with 3 bases and even the "trimmer guide". I replaced the aluminum roller of the trimmer guide with precision bearings. But had to buy the original Makita dust chute for the plunge base.
The 3 bases can fit the Original Makita motor - corded or 18V and the Hikoki (metabo-HPT) 18V and 36V compact routers.
 

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If my thoughts about the use of the coils is correct, ( just looked through a parts breakdown and they as I described) the two coils (actually springs) are most likely an integral part of the field winding. Basic current flow for the unit is:

through the control and switch module
through one winding of the stator
to one brush holder
through brush to armature and out the other brush
through second brush holder
to second stator winding
to mains neutral

Based on above and the style of brusholder used, the stator would have two connection terminals and two pigtails with the coil (spring) attached at the free end ready to slip over the brushholder.This is the brushholder image I found in a parts supply listing.
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These two portable belt sanders show how the ring goes around the brush holder. The trick is to get another ring and solder it in place. The ring is generally an integral part of the field coil windings but it can be replaced by splicing. I've done it on portable power tools that were worth rebuilding if that's all that's wrong. Sometimes the brush holder component gets loose and twists. This leads to a lot of sparking and eventually burns through the circular ring.

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