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DeWALT DW421 TYPE 1 Random Orbit Sander dewalt logo

 DeWALT DW421 TYPE 1 Random Orbit Sander Parts

Page A

 Fig # Img Part Name Availability Price
1Armature With Bearings Obsolete - Not Available
Part #: 578863-03
Discontinued
N/A
2Field Obsolete - Not Available
Part #: 807254-08
Discontinued
N/A
3Carbon Brush (Sold Individually)
Part #: 445861-25
Note: Sold Individually
In stock
25+ available
 $5.80
Add To Cart
4Brush Spring
Part #: 445860-00
In stock
17 available
 $3.99
Add To Cart
5Brush Ring, Brushes Sold Seperately
Part #: 449899-05
In stock
6 available
 $17.26
Add To Cart
6Switch (On-Off)
Part #: 144960-00
In stock
22 available
 $4.92
Add To Cart
7Power Cord - 10', 18 Gauge, 2-Wire -Terminals not included
Part #: 330072-97
In stock
16 available
 $21.75
Add To Cart
8Ball Bearing (6000DU)
Part #: 330003-17
In stock
9 available
 $11.01
Add To Cart
9Ball Bearing
Part #: 605040-05
In stock
23 available
 $5.45
Add To Cart
10Fan
Part #: 616020-00
In stock
3 available
 $3.99
Add To Cart
11Clamshell Set
Part #: 380382-00
Ships in 10 - 16 business days
 $19.29
Add To Cart
13Cord Protector
Part #: 330005-01
In stock
25+ available
 $5.06
Add To Cart
14Clamp,Cord
Part #: 380414-00
In stock
6 available
 $1.37
Add To Cart
15Cap and Screws
Part #: 285252-00
In stock
2 available
 $7.00
Add To Cart
16Lead Assembly
Part #: 144989-00
In stock
4 available
 $2.99
Add To Cart
Fig #ImgPart NameAvailabilityPrice
17Receptacle
Part #: 445964-00
In stock
14 available
 $2.99
Add To Cart
18Terminal
Part #: 825209-00
In stock
12 available
 $2.99
Add To Cart
19Clamshell Shroud
Part #: 610078-00
In stock
4 available
 $8.14
Add To Cart
21Retainer
Part #: 286181-00
In stock
8 available
 $6.65
Add To Cart
22Bearing Retainer (Self Tapping)
Part #: 603637-00
In stock
20 available
 $3.99
Add To Cart
23Ball Bearing (6202)
Part #: 330003-13
In stock
25+ available
 $5.45
Add To Cart
24-A5" Sander Pad Hook and Loop(Velcro)
Part #: 151281-08
In stock
25+ available
 $20.59
Add To Cart
24-BSander Pad 5" PSA No Vacuum Holes
Part #: 151662-00
In stock
17 available
 $18.82
Add To Cart
24-C5" PSA-Adhesive Sanding Pad 8 Vacuum Holes
Part #: 151281-09
In stock
25+ available
 $20.61
Add To Cart
25Baffle
Part #: 151549-00
In stock
2 available
 $3.59
Add To Cart
26Dust Seal/Brake
Part #: 151553-00
In stock
18 available
 $6.38
Add To Cart
27Cover,Switch
Part #: 144983-07
In stock
18 available
 $3.99
Add To Cart
28Dust Bag Asm
Part #: 386856-00
In stock
15 available
 $16.02
Add To Cart
29Dust Bag Asm
Part #: 386856-00
In stock
15 available
 $16.02
Add To Cart
30O-Ring
Part #: 56194-00
In stock
13 available
 $3.99
Add To Cart
Fig #ImgPart NameAvailabilityPrice
Dust Bag
Part #: 608354-00SV
In stock
25+ available
 $10.88
Add To Cart
Ring,O Obsolete - Limited Quantity
Part #: 152365-00
In stock
1 available
 $2.99
Add To Cart
32O Ring
Part #: 700871-00
Ships in 10 - 16 business days
 $7.08
Add To Cart
33Screw
Part #: 330019-11
In stock
1 available
 $1.99
Add To Cart
34Screw,Machine
Part #: 098012-11
In stock
6 available
 $2.99
Add To Cart
35Screw
Part #: 146929-01
In stock
25+ available
 $1.99
Add To Cart
36Screw,Plastite
Part #: 330019-02
In stock
20 available
 $1.99
Add To Cart
37Screw
Part #: 330019-08
Ships in 10 - 16 business days
 $1.20
Add To Cart
38Screw
Part #: 330019-03
In stock
25+ available
 $2.99
Add To Cart
39Screw
Part #: 330019-11
In stock
1 available
 $1.99
Add To Cart
39AScrew,M4X19
Part #: 330019-13
In stock
25+ available
 $1.99
Add To Cart
40Washer,Cone
Part #: 151652-00
In stock
12 available
 $2.99
Add To Cart
41Ident. Label
Part #: 398399-00
Ships in 10 - 16 business days
 $1.20
Add To Cart
43Ring,Retaining
Part #: 151669-00
Ships in 10 - 16 business days
 $1.37
Add To Cart
44Nut
Part #: 144956-00
Ships in 10 - 16 business days
 $1.20
Add To Cart
Fig #ImgPart NameAvailabilityPrice
50Dust Bag
Part #: 608354-00SV
In stock
25+ available
 $10.88
Add To Cart
861Kit Box
Part #: 625383-00
In stock
4 available
 $62.00
Add To Cart

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Discussion
Discussion for the DeWALT DW421 TYPE 1 Random Orbit Sander

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Sander stopped blowing dust into dust bag. I have disassembled it, cleaned it( no blockages found), replaced the sanding disc and the dust seal/brake "ring" and it still will not blow into the dust bag.
1276371
Question: Dewalt Dw 421 Sander

1276371

The sanding pad on my DEWALT DW 421 Palm Sander does not spin when pressure is applied to it. The motor runs fine. It is if the "transmission" is broke but the motor is fine. The local service center wants more money to diagnois and fix it than the cost of a new one. I have dismantled it and nothing seems to be broken. Any advice on what is broken.
Tinkerdave
Reply: Dewalt Dw 421 Sander

Tinkerdave

Hi,
You will need to replace the following:330003-13 Ball Bearing (6202),151553-00 Dust Seal/Brake.But first remove the old parts and make sure that your armature shaft is not broken.The 421 was known to have some armature breakage.If the armature is ok and spins freely then the replacement parts should fix your problem.The parts your replacing are normal wearable parts. Hope that helps.Good luck.
Tinker
I had a hard plastic dust collector and I am replacing it with the dust bag. Is the old male end of the dust bag on the sander to be removed?
WJA
Reply: Attaching Dust Bag To DW421 Sand...

WJA

Hello AZMort,

Which dust bag are you replacing there are two that you can choose from.
Dewalt type 1 orbital sander

why is it that the dewalt brushes come with the terminal ends on and the power cords , which require 2 different ends don't ? I thought I was buying a direct replacement cord !! It/ I ordered 2 , they are not installable as they are !! looking closer at the picture I see the ends , and looking at the existing cord , one needs a special tool to install those ends

I guess my point is , that if your going to sell a replacement cord it should be complete and ready to install, now I got to wait another week for the damn ends to get here !!
WJA
Reply: Power Cords,type 1 Dewalt Orbit...

WJA

Hello win38mag,

We are sorry for the problems you are having. I will have the description of the cord fixed. Saying -Terminals not included-

-WJA
bud660
Question: Dust Bag For Dw421 Sander

bud660

new bag wont fit ? trying to replace older hard plastic dust bag with part #60835-00sv
WJA
Reply: Dust Bag For Dw421 Sander

WJA

Hello bud660,

There are 2 different types of the Dewalt DW421 sander. check your type number to see if you have the right collector.

-WJA
1030179
Question: DW412 Shop-vac Adapter

1030179

Hi,

I have an old DW421 with a hard plastic dust collector, made out of a porus plastic. I would like to attach the sander to a 1 1/4" shop-vac hose. Will the current version of the cloth bag dust collector work with my sander? If so, does that part allow me to attach the shop-vac? If not, is there another way to attach the shop-vac?

Thanks,
Tim
jnphil
Question: Free Wheeling Sanding Pad

jnphil

Hello,
I replaced the pad and the dust/brake shield but the pad still spins at the motors RPM. What else could cause this?
Tinkerdave
Reply: Free Wheeling Sanding Pad

Tinkerdave

Hi, You will need to replace Ball Bearing (6202DU) Part Number: 330003-13.Hope this helps.
Tinker
randamadee
Question: Stops When Contacting Workpiece.

randamadee

i have the same problem as john, and no one has answered his concern. sander spins fine when turned on, but as soon as it contacts the workpiece it just stops spinning. any ideas what parts i need to replace.
Tinkerdave
Reply: Stops When Contacting Workpiece.

Tinkerdave

Hi, Replace bearing 330003-13.That is the only real thing that would cause it to stop when you put it to the work surface.Hope that helps.
All the best
Tinker
Gregg
Question: Palm Sander Does Not Orbit

Gregg

My Dewalt 421 palm sander does not orbit anymore. What is the problem? I took it apart and cleaned it and found a thin steel shim that was torn. Is that the problem? I cannot find it in the parts list.
thanks, Gregg
Mark
Reply: Palm Sander Does Not Orbit

Mark

Hi Gregg,

I would suspect that the problem is a bearing failure. Either the pad bearing or the lower armature bearing. The shim you saw was probably actually one of the bearing shields that fell off when the bearing failed. To repair your sander you will need to find the bad bearing and replace it.

Good luck with your repair!

-Mark
jose
Question: Replace Brushes

jose

How do I replace the brushes in my sander?
Mark
Reply: Replace Brushes

Mark

Hi Jose,

To replace the carbon brushes you will first remove the top cap on the sander. With the cap removed the brushes will now be accessible. Using a pick or small screwdriver, pull the brush springs (item #4) back. Now you can pull the brush from its holder. The brush wire pushes into its connector. Using a pair of needle nose pliers, pull the brush wire from its connector. Now you can install the new brushes in the reverse order.

I hope this helps with your sander repair!

-Mark
Mac Juno
Question: DW421 Pad & Retainer

Mac Juno

Are the 3 screws holding the pad to the retainer screwed tight or loose? I can't tell as my threads were stripped when I disassembled mine.
Mark
Reply: DW421 Pad & Retainer

Mark

Hi Mac,

The screws should be tightened down firmly so that the pad is held firmly and does not move.

-Mark
David
Question: DeWalt Dw421

David

My DeWalt DW421 orbital sander pad spins at the same rpm as the motor and becomes almost ballistic and dangerous. It is a useless piece of machinery in this state. I do not believe a "brake" will be able to stop or even slow down this spinning. It would wear out a brake very fast. It is out of warranty, but has not been used often enough to wear the sander out.
Mark
Reply: DeWalt Dw421

Mark

Hi David,

The problem is definitely with the dust seal / brake. All random orbital sanders use something similar to it. With all brands it is probably the second most common part that fails right after the sanding pad.

The brake for your DW421 sander the Brake is part #151553-00 and it is available from http://www.ereplacementparts.com.

Good luck with your repair!

-Mark
zachenos
Question: Weak Sander, Dead Drill, Oh My!

zachenos

Hello Folks -

My trusty orbital sander is loosing steam and not running with as much power as it used to. Ideas?

My Milwaukee PowerPlus 18v 1/2" Cordless Drill is also not up to snuff, however it simply will not turn. I though the problem was the batteries, however after replacement and a new charger I can verify full juice off the batteries with a multimeter, but the drill barely turns, and if it does it is so so weak. Before it totally nose dived I noticed a metalic/electric smell when I would run it. Towards the end the drill made a grinding sound as it revolved.

Suggestions on what to replace or shall I retire these tools for good?


Thanks!

Zach:confused::confused::mad::cool:
TERRY P
Reply: Weak Sander, Dead Drill, Oh My!

TERRY P

Zach..
The sander might just need a set of brushes and a bearing or two.
The cordless drill sounds like you cooked the motor. Only way to tell is to take them apart and search out the damage. If you've just replaced the charger and batteries you've already spent alot trying to correct the problem and at this point should probally keep going. The drill may have other issues also....like switch or transmission.
If your not sure which is the problem ,you might consider stopping by your local repair shop and let them check it out ,or you could end up replacing components it didn't need. Generally they can repair it at half the cost of a new one or less, or let you know if its ready for the retirement home...
dctoruro
Question: DeWalt DW421 Sander

dctoruro

I have a DeWalt DW421 Sander. Don't know if Type 1 or Type 2. Suspect an older Type1. Purchased at Orchard Supply Hardware in Sunnyvale, CA quite a few years ago. I have replaced the sander pad and would like to replace the three screws that hold the sander pad in place. However the three screws currently in place are finely threaded screws and there are none like them listed on the ereplacementparts.com web site under this model # for either type1 or type 2. Any idea where I might be able to find replacements? Thanks.
My DeWalt DW421 orbital sander worked fine at first, but did not survive much use. I would consider it dangerous when the pad begins to spin at the RPM of the motor. I would classify it as a short-life and high maintenance machine and would suggest purchasing a different brand.
Michael
Reply: DeWALT - DW421 DeWalt DW421

Michael

I have been using my DW421 for many years, it is the best orbital I have ever had. I am a professional cabinetmaker. I have had to replace the dustcover/brake piece in order to keep it from spinning out of control.
mitchhamman@hotmail.com
Review: DeWALT - DW421
5 star
mitchhamman@hotmail.com
my dewalt DW421 is such a good tool, I have two of them now.
Robert L Jones
Review: DeWALT - DW421
5 star
Robert L Jones
i like this tool i have had this a very long time but i like dewalt tools i believe there are the best tools built i have bought saws and drills love thim all.... dw421
Dave39
Review: DeWALT - DW421
4 star
Dave39
I have used this sander for many projects over the past years and find it to be well made and functional for the uses I put it through. It fits my hand well and allows for easy sanding whether it be removal of stock or fine finishing.
MattF
Review: DeWALT - DW421
5 star
MattF
I love this sander. It's light and powerful, and seems to be reliable. I agree with the review above, there is one problem. The dust collector is friction fit, and if you are not careful it can fall off easily. Other than that, it is a great tool.
John L.
Review: DeWALT - DW421
5 star
John L.
I have 3 of the dewalt DW421 sanders and they each have the same problem that when holding the sander off the surface they run great, but as you touch the surface it stops turning. I have replaced the brushes and still doesn't help. Does anyone had this same problem or know the fix. Thank YouJohn
David F.
Review: DeWALT - DW421
4 star
David F.
The DW421 is a great sander. It is lightweight, but still has lots of power. I have really liked the grip and the feel of the tool. When you put a heavy grit sandpaper on, it just feels like you can remove a lot of material quickly. It seems to have a solid construction. I have had good luck with DeWALT tools. Most of the ones that I have owned have been reliable. From other reviews that I have read, this sander uses a "controlled finishing system." As far as I know, this just means that a pad brake will keep the pad from spinning when it is not pressed against the material.My only two gripes with this tool are the dust collection system and the vibration during use. Several times the whole dust collection canister has slid off altogether. It is a friction fit design (why they would think this would be enough, I am not sure.) It seems like they could have easily put on a some type of locking mechanism that would keep it secured to the base of the sander. The vibration is not horrible, but it is noticeable after using the sander for a long time. My hands have that slightly numb feeling when I am done using it.I really like this sander, but with a few small changes DeWALT could have made a better product.
Michael
Reply: DeWALT - DW421

Michael

I put a screw in mine to keep the dust collection canister from falling off. My hands get numb after sanding for a while with any kind of orbital sander.
Accessories
Accessories for the DW421

Sandpaper Discs:
See more sandpaper discs 
2610922422
5-Pack Hook and Loop 80-Grit 5
$4.62

SR5R245
50-Pack Hook and Loop 240-Grit 5" 8 Vac. Sandpaper Discs
$30.17

SR5R065
50-Pack Hook and Loop 60-Grit 5" 8 Vac. Sandpaper Discs
$35.71

fancyboxy