Part Location Diagram of 939539-00 DeWALT Carbon Brush
See part 104 in the diagram
Replacing your DeWALT Angle Grinder Carbon Brush
( Grid squares measure 1x1 inch )

Carbon Brush 939539-00

Manufactured by:
DeWALT
ERP Number:
ERP10185921
Part Number:
939539-00
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

Easy 

15 - 30 mins 

(8 rated repairs) ?

Does this part fit my model?

Need help finding your model number?

Product Description

?

Genuine Dewalt replacement part This brush is sold individually, 2 are needed for the tools shown below It is always best to replace both brushes, even if only one is worn. Worn brushes frequently are the cause behind a motor running poorly. Replacing brushes can fix a motor that's operating intermittently. New brushes can restore a motor's electric braking. Carbon brushes are one of the most commonly replaced power tool parts. This is because carbon brushes are wear items, meaning that through friction and use they will gradually wear away until they need replacing. Worn brushes are a common causes of intermittent motor function, reduced electric braking and reduced motor power. A worn-out brush will often be worn down near to the wire lead and can be cracked, pitted, or burned. When replacing carbon brushes, be sure to inspect your armature for burns, cracks, or other damage which can indicate larger motor problems.

Frequently Purchased Together

?

Troubleshooting

This part works with the following brands:
  • DeWALT
  • DeVilbiss
  • Black and Decker
  • Craftsman
This part works with the following products:
  • Angle Grinder
  • Grinder
Part# 939539-00 replaces these:
939539-00,

Videos For installing this part.

?
Replacing your Carbon Brush

Customer Part Reviews

?
4.7
Average Rating (out of 5):
★★★★★
★★★★★
(6 Reviews)
Click to filter by ratings:
  • 5 stars
    5
  • 4 stars
    0
  • 3 stars
    1
  • 2 stars
    0
  • 1 star
    0
  • 1
Sort by:  
Sorry, we couldn't find any existing reviews that matched. Try using some different or simpler keywords.

Questions & Answers

?

Our customer Service team is at the ready daily to answer your part and product questions.

Be the first to ask our experts a question about this part!

Ask our Team

We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.

Does this fit my product?

Customer Repair Instructions

All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.

Easy 

15 - 30 mins 

(8 rated repairs) ?
  • 1
Sort by:  
Sorry, we couldn't find any existing installation instruction that matched.

Motor stopped running: brushes were worn down and lost commutator contact

Ian from Aiea, Hawaii

3 of 3 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
939539-00
1. Removed housing screws.
2. Separated housing and removed armature.
3. Used 600 grit sand paper to clean commutator contacts.
4. Removed old brushes and slid new brushes in brush holders.
5. Used compressed air and blew out any debris.
6. Applied some wheel bearing grease to the gearing.
7. Reassemble d.

Tool was Craftsman 4 1/2\" angle grinder 16 years old.
Did you find this story helpful?
Thank you for voting!

on-off slide switch woul not stay latched, had to be held on at all times

PETER from LYONS, New York

2 of 2 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers
Remove grinder gear head, 4 screws.Remove rear housing 1 screw. disconnect brushes. Pull out rotor and attached fan,diffuser, and bearing. Pull leads out of stator and caps to remove 2 screws. Unplug switch leads, remove switch and switch support, power cord all together. Push stator assembly forward out of housing far enough to get link and button out of housing. Put new link in slot and snap button in end of link through housing opening. Push stator to the rear back onto the housing. Assemble everything back in reverse. Note; When putting rotor in housing make sure the little tabs on fan diffuser are lined up.
Did you find this story helpful?
Thank you for voting!

Brushes were pretty worn out.

Carol from Flagstaff, Arizona

2 of 2 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
939539-00
Removed the old brushes and replaced them with the new brushes. Very easy!! Only had to use a screw driver to put the housing back together.
Did you find this story helpful?
Thank you for voting!

Would not run

Gary from Columbus, Mississippi

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Remove the end cap of the grinder
Disconnect the brushes and holders
Remove the old brush holders
Install the new brush holders
Pull back brush holder spring and insert the new brushes and connect them
Place inner and out flanges on the spindle
Install the end cap

Did you find this story helpful?
Thank you for voting!

Would not run.

jeffrey from Skagway, Alaska

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Pliers, Screw drivers
Parts Used:
945614-00, 939539-00
1. removed one screw and the back cover.
2. remove switch, disconnect wires with pliers.
3. connect wires to new switch, replace in holder.
4. lift spring holder off brush, remove, disconnect wire.
5. attach wire of new brush, insert into holder, replace spring.
6. repeat #4&5 with second brush.
7. repl ace back cover.
Did you find this story helpful?
Thank you for voting!

Brushes worn out

Robin from NEW ULM, Minnesota

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
Parts Used:
939539-00
Remove the electrical cord end cover(four screws) and replaced the brushes.
Did you find this story helpful?
Thank you for voting!

Brush holders was bad and, brushes was worn out.

glenn from berkeley springs, West Virginia

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
Parts Used:
939539-00, 606574-01SV
Check the manual on how to take apart, one screw held the housing . One screw each held the brush holder. Removed the wire from the holder, then reinstall the holder, then installed the brushes. Screwed the housing back on, then back to grinding.

Work safe AND unplug the tool..
Did you find this story helpful?
Thank you for voting!

Worn out brushes, weak springs

Ignacio from Stevenson Ranch, California

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Pliers, Screw drivers
Single screw on grinder handle, loosen it and the cover pulls apart, very simple repair
Did you find this story helpful?
Thank you for voting!
  • 1

Model Cross Reference

This part works with the following models:
ERP Number: ERP10185921
Manufacturer Part Number: 939539-00
Brand Model Number Description
Craftsman 24544SE Grinder - Sears Craftsman 4-1/2 In
Black and Decker 26436 Angle Grinder - 4-1/2 Small Angle Grinder
Black and Decker 26437 Angle Grinder - 4-1/2 Small Angle Grinder
Black and Decker 26437OS Angle Grinder - 4-1/2 Angle Grinder
DeWALT 26742 Angle Grinder - Angle Grinder
Black and Decker 27326 Angle Grinder - 4-1/2 Small Angle Grinder
Black and Decker 27327 Angle Grinder - 4-1/2 Small Angle Grinder
Black and Decker 27703 Angle Grinder - 4-1/2 Right Angle Grinder
Black and Decker 27742 Angle Grinder - 4-1/2 Right Angle Grinder
Black and Decker 27743 Angle Grinder - 4-1/2 Right Angle Grinder
Craftsman 900245440 Angle Grinder - Angle Grinder
Craftsman 900264370 Angle Grinder - Grinder
Craftsman 900277031 Angle Grinder - Grinder
Craftsman 900277420 Angle Grinder - Grinder
Craftsman 900277421 Angle Grinder - Grinder
Craftsman 900277422 Angle Grinder - Grinder
Craftsman 900277431 Angle Grinder - Grinder
DeWALT D28090-B3 Grinder - 4-1/2 Small Angle Grinder
DeWALT D28090-BR Grinder - 4-1/2 Small Angle Grinder
DeWALT D28090AV-B3 Grinder - 4-1/2 Small Angle Grinder
DeWALT DW406 Angle Grinder - Angle Grinder
DeWALT DW818 Angle Grinder - Angle Grinder
DeWALT DW818-B3 Grinder - Slider Sag
DeWALT DW818-BR Grinder - 115mm Grinder
DeWALT DW821 Angle Grinder - Angle Grinder
DeWALT DWE4010-B3 Grinder - 700w Small Angle Grinder
DeWALT DWE4010-BR Grinder - 700w Small Angle Grinder