Repair Forum     Repair Center    Blog
Sign In Support Shopping Cart
Authentic Parts
      Call us toll free 866-802-6383
8:00AM-10:00PM Mon-Fri, ET
9:00AM-8:00PM Sat, ET
Repair Parts Home    Power Tool Parts    DeWALT Parts    DeWALT Cordless Drill Parts    DeWALT DW991 TYPE 4 Cordless Drill Parts
DeWALT DW991 TYPE 4 Cordless Drill dewalt logo

 DeWALT DW991 TYPE 4 Cordless Drill Parts

Page A

 Fig # Part # Img Part Name Availability Price Qty
1392654-04
Clamshell Kit Obsolete - Not Available
Discontinued
$0.00N/A
2798954-00
Washer,Retain.
In stock
2 available
 $2.16
3151936-02
Gear,Planet 1ST
In stock
2 available
 $3.69
4385408-00SV
Carrier
Ships in 9 - 14 business days
 $14.91
5393111-04
Motor and Pinion
Note: Includes Figure 6
Ships in 9 - 14 business days
 $77.71
6389025-00SV
Brush Pair Kit
Note: Included In Figure 5
In stock
25+ available
 $14.76
7152274-19SV
Switch, V.S.R.
Note: Use actuator 611411-01
In stock
25+ available
 $67.08
391114-00
Button(Fwd/Rev)
In stock
2 available
 $1.12
151296-00
Button,Reverse
Note: Forward / Reverse
In stock
5 available
 $2.56
9153281-03
Shifter Obsolete - Not Available
Discontinued
$0.00N/A
10144658-00
Spring
In stock
4 available
 $1.12
11387374-00
Adjust Collar
In stock
2 available
 $5.05
12330075-46
Keyless Chuck (Jacobs, 3/8
In stock
25+ available
 $46.70
13605256-01
Screw (Reverse Thread)
Note: Torx T20 Head
In stock
25+ available
 $1.12
14148354-03
Bit Clip
In stock
25+ available
 $1.12
Fig #Part #ImgPart NameAvailabilityPrice
15607918-41
Screwdriver Bit
In stock
25+ available
 $0.95
16330019-00
Screw,Base
In stock
25+ available
 $1.12
17098091-10
Screw
In stock
15 available
 $1.12
18330019-04
Plastite Screw
In stock
25+ available
 $1.11
19N104678
Planet Gear
In stock
3 available
 $3.83
21388949-00
NP:DW991 T4
Ships in 9 - 14 business days
 $1.76
22395657-00
Dewalt Logo Label
In stock
25+ available
 $1.12
23A615824-12
Dewalt 14.4 Volt Battery (XRP, Ni-Cd)
In stock
2 available
 $88.36
23B615824-12
Dewalt 14.4 Volt Battery (XRP, Ni-Cd)
In stock
2 available
 $88.36
24385409-01
Carrier
Ships in 9 - 14 business days
 $13.87
25805068-01
Gear,Ring 2-RED
In stock
2 available
 $1.12
27798701-00
Case,Gear
In stock
2 available
 $8.93
28389025-00SV
Brush Pair Kit
In stock
25+ available
 $14.76
29389025-00SV
Brush Pair Kit
In stock
25+ available
 $14.76
30152482-00
Seal,Foam
In stock
2 available
 $1.12
Fig #Part #ImgPart NameAvailabilityPrice
31386154-01
Carrier,Output
Ships in 9 - 14 business days
 $13.87
32392755-00
Output Gear
In stock
2 available
 $3.17
33805063-02
Gear,Ring
Ships in 9 - 14 business days
 $4.77
34370506-02
End Cap Obsolete - Not Available
Discontinued
 $0.00N/A
35798966-01
Housing Assembly Obsolete - Not Available
Discontinued
$0.00N/A
36805004-00
Washer,Flange
Ships in 9 - 14 business days
 $2.40
37798959-00
Clip,Bearing
In stock
2 available
 $1.12
38387175-00
Detent Plate
Ships in 9 - 14 business days
 $1.28
39380793-00
Pin
In stock
10 available
 $1.28
40387172-00
Adjust Nut
Ships in 9 - 14 business days
 $1.12
41386279-00
Spindle Assembly
Ships in 9 - 14 business days
 $27.81
42386690-00
Ball
In stock
6 available
 $1.12
43152347-00
Spring
Ships in 9 - 14 business days
 $1.12
44380264-14SV
Transmission Assembly
Ships in 9 - 14 business days
 $61.24
45389073-00
CLTCH Mechanism Obsolete - Not Available
Discontinued
$0.00N/A
Fig #Part #ImgPart NameAvailabilityPrice
46798689-00
Plate,Thrust Obsolete - Not Available
Discontinued
$0.00N/A
800N017298
Grease,Molykote
Note: 8 oz.
In stock
3 available
 $69.66
861381121-00
Box,Kit
In stock
2 available
 $55.03
871ADC9310
DeWALT 7.2V-18V NiCd - NiMh - Li-Ion Battery Charger
In stock
12 available
 $76.31
871B388683-12
DeWALT 7.2V - 18V Charger
In stock
3 available
 $94.64

Enter your engine's type number in this search field to show the parts that match your engine.

Your engine's type number is the second part of the model number stamped on your Briggs & Stratton engine (see picture).

Drill Parts  Cordless Drill Parts  Drill Parts

Repair Articles

How to Remove a Stuck Drill Chuck
How to Remove a Stuck Drill Chuck

Broken gearboxes and sticky chuck screws can make removing a drill chuck difficult. This article explains the tricks you need to overcome these common repair setbacks.
Drilling, Fastening, and Hammering Power Tools
Drilling, Fastening, and Hammering Power Tools

This article lists the major categories of drilling, fastening, and hammering tools, and explains the basic applications, types, and features of each.
How to Hot-Wire Test a Cordless Drill Motor
How to Hot-Wire Test a Cordless Drill Motor

This article explains how to hot-wire test a cordless drill motor with step-by-step instructions and a demonstration video.
Removing And Replacing DeWALT Drill Transmissions
Removing And Replacing DeWALT Drill Transmissions

This article explains how to carefully remove the transmissions of DeWALT drills and drivers, and how to replace them again.
Discussion
Discussion for the DeWALT DW991 TYPE 4 Cordless Drill

Post a Comment
Login or signup to comment.
Login or signup to comment.
Ask a question, answer a question, or post a comment!
  • Subject:
  •  
  • Comment:
  •  
gscott
Question: Shifter For DW991

gscott

I see where the shifter switch (fig.9, part 153281-03) is no longer available. Is there one from another model that will work, mine is broken.
WJA
Reply: Shifter For DW991

WJA

Hello gscott,

Unfortunately the manufacture did not furnish a replacement part after they stopped supplying the 153281-03 shifter. They did use that part on a number of different models. You might try locating a used tool for spare parts.

Hope this helps,
-WJA
Purciful
Question: Dewalt DW991 Conversion

Purciful

I was wondering if anyone has ever converted a DW991 14v to a DW995 18v by simply just changing the clam shell. I recently loosened up the clamshell on the dw991 and plugged in a 18v and it worked just fine. I of course used a dremel to modifiy it a little. The clam shells online look identical except of course the battery base.
dale headley
Question: Chuck Removel

dale headley

How do I remove the chuck to make repairs. The drive gears are shot.
Mark
Reply: Chuck Removel

Mark

Hi Dale,

Replacing a drill chuck is a simple repair if you first know a couple of tricks. We have prepared an article and video that will provide you with all of the information you will need to replace your drill chuck. You can find the article and video at the following link...

http://www.ereplacementparts.com/article/890/Cordless_Drills_101.html

I hope this helps you with your repair!

-Mark

Thomas Ambler
Question: Help

Thomas Ambler

How do you replace a clutch on a DW991 type 3 cordless drill?
jack cunningham
Question: Chuck Won

jack cunningham

I have a dw991 cordless drill. I dropped it on chuck, now sometimes it will turn and sometimes it won't. Should I try to fix, or scrape it? Motor always runs.
Phil
Question: Dw991 Issue.

Phil

I have an old DW991 Type 1 , it's 10 or 12 years old now... been rock solid. Yesterday I was driving screws with it and it started ratcheting like I had it on a torque setting. I checked the collar , it was on " drill". Is this a clutch problem or a " transmission" issue? What parts might I need?
scrounga
Question: DeWalt 991 Trigger Repair

scrounga

Hi all, I have a dead trigger out of a 991 and I'm hoping someone with the same trigger can help me out. This is the standard DeWalt trigger fitted to their variable speed, forward/ revese drills and the current replacement part number is 152274. The main transistor in mine has burnt out and I am tying to find the value so I can replace it. The transistor is located under the large copper heatsink that wraps around the trigger. If you undo the single screw the heatsink will lift away and the transistor can be pried up (without damage) from the end where the screw attaches and the numbers may be printed on the underside of the tranistor. I took mine to the local Radio Shack type store and the helpful assistant explained that the zap that took out the transistor also took out enough of the numbers to make the value unobtainable. I found this drill in a dumpster at my work complete with 2 XR batteries and a charger in a panasonic case. I took it home thinking I might be able to use the motor out of it and expected to be throwing back in the bin after pulling it apart, but the first suprise was that the charger seemed to be charging the batteries OK. When I put the batteries in the drill, nothing. After pulling it apart and by-passing the trigger everything worked as it should so I started to examine the trigger.
After removing the heatsink and seeing the transistor conected to it I became very supicious because to need such a large heatsink that transistor was going to be getting a hard time. Once I pried it up I could see the hole litterally blown in it. I mangaged to borrow a trigger out of a 988 for testing and the 991 works perfectly. I don't want to pay $60- $90 for a new trigger when it is probably a $1 tranistor. I imagine there was quite a smell when the drill died and that's why it ended up in the bin. The transistor in the 988 trigger by the way was blank. Doh!!
Any help you can provide on the transistor value would be much appreciated.
PS you folk in the U.S. are so lucky to be able to buy repalcement parts so cheaply because here in Australia everything has to come through a dealer and they charge like a wounded bull. I WISH eReplacementparts would ship internationally. $11 for a clam shell, what a bargain!!!
I have a DeWalt 14.4v cordless drill model DW991 type 1. I ordered and eReplacementParts.com sent me the "replacement" switch 152274-19 as shown on the parts list, but the wire connections are not the same as the original switch. :confused:

The original has two wires from the brushes and three others; red and black that connect to the battery and a blue wire that connects to the side of the original switch. The new switch has two connectors marked M1 and M2 which I assume are the brush connectors, but there are no other wire connectors. Can anyone advise me how to connect the wires to the new switch?
kududave
Reply: DeWalt Model 991 Replacement Swi...

kududave

I figured it out myself. Connect the original battery leads(red and black) together, abandon the blue wire and connect the brush leads to the new switch. Works perfectly.
Conyers_gEEk
Question: Replacing Brushes On DeWALT DW99...

Conyers_gEEk

I have a 10 year old DeWALT DW991 cordless drill that is sparking a good bit and giving off a good whiff of smell. From the other threads, I can see that I need to replace the brushes. It appears that the motor on this unit is sealed and the brushes cannot be replaced easily. Is that correct? I assume that I can buy a new motor/pinion combination and it will come with new brushes. I just hate to spend extra money.
Dale
Reply: Replacing Brushes On DeWALT DW99...

Dale

I have found that by the time your brushes wear out. The bearing's on the motor are not far behind. I usually change the motor. If you just change the brushes. They don't seat real well on the old armature. And you will get a lot of sparking. Hope this helps.
dwerhane
Question: DeWalt DW991 Type 5

dwerhane

I have an old DW991 Type 5 cordless drill with fairly new batteries. When I squeeze the trigger there is a high pitched squeel but nothing else happens. It makes no difference what direction or setting the drill is on, it just doesn't work. Is this the trigger switch, the trans or the whole enchilada?
Thanks
Dave
cmoorejack
Reply: DeWalt DW991 Type 5

cmoorejack

Hey dwerhane,
you might have a seized motor but you will have to disassemble the tool to troubleshoot..once the motor is out you will be able to see if it is locked up by turning the gear on the shaft..another possibility is the switch.. check it for a burnt smell or a continuity test..
Hope this is helpful..
Craig
scrounga
Reply: DeWalt DW991 Type 5

scrounga

Hi there, incase you haven't fixed it or thrown it away yet I am sure it's the trigger that's packed it in. I have one that is doing the same thing and when I by-passed the trigger it worked fine. There is a transistor that is screwed to the large copper heat sink that wraps around the trigger and mine is burt out. A new trigger is expensive though, anything from $50- $90. My next job is to see if I can get the trigger apart but i'm not confident as it has spring loaded components and these don't like being reassembled. Just a little more thought by DeWalt would have made replacing the transistor fairly straight forward job. You will see what I mean when you pull the trigger out.
Hope this helps you or someone else,
Cheers Scrounga.
I have a Dewalt DW991 Type 3 Cordless drill. I need to get the chuck off so I can take apart the case and troubleshoot. I see that Mike has posted a good writeup on removing a chuck but I would like to know the size of the allen wrench that removes the chuck screw. I have tried all in my tool box and none fits.
TERRY P
Reply: Size Of Allen Wrench To Remove C...

TERRY P

It's not an allen key, it's a torx bolt. Size # t20. The screw comes off with left hand threads (clockwise). The chuck has right hand threads (comes off counter-clock wise)
gwlinn
Reply: Size Of Allen Wrench To Remove C...

gwlinn

Thanks, Terry. It was kinda hard to see down there. I know the case screws are torques, but it sure looked like the chuck screw was an allen.
Thubten Jampel
Question: Transmition Grease?

Thubten Jampel

The gears in my drill finally blew out. I am getting some replacments right now. What kind of grease do I use? Thanx
cmoorejack
Reply: Transmition Grease?

cmoorejack

Hey Thubten,
Every manufacturer has their own grease they recommend..but you can purchase a good gear grease at most auto outlets..a good rule of thumb is not too thick and not too runny..! only fill up your gear case a little more than half..if you put too much it could overheat..too little and your gears will wear out sooner..most high speed or heavy torque tools need special grease's but for a drill you should be ok to use a generic grease...
Hope this has been helpful..
Craig
Geneva Tool Repair
danavilla
Reply: Transmition Grease?

danavilla

I'm replacing some parts in a friend's Sawzall including wobble bearings, the intermediate gear and bearing plate. One of the parts listings show 2 different Milwaukee lubes for them, Type A and Type B.
Can I get lubes from auto parts store to suffice?

What do I ask for?


Dan
cmoorejack
Reply: Transmition Grease?

cmoorejack

Hey Dan,
If the replacement bearings are sealed then the grease for them is not an issue so one kind of grease will be ok..replace with a thicker gear grease if possible as it is designed to hold heat..just fill the gear chamber as full as possible and then coat the rest of the wobble mechanism with about a hand full.. auto parts store should have something compatible for you..
hope this is helpful..
Craig
Geneva Tool Repair
danavilla
Reply: Transmition Grease?

danavilla

Thanks Craig:

I haven't received the parts yet (ordered from eReplacement Parts) so I don't know if the bearings are sealed or not. Your advice is certain to assist me in the repair.

Dan
Accessories
Accessories for the DW991

Hole Saws:
See more hole saws 
49-56-0117
2" Hole Saw - 5/8"-18 Thread
$13.18

49-56-0062
1-1/4" Hole Saw - 5/8"-18 Thread
$12.18

49-56-0193
3-1/2" Hole Saw - 5/8"-18 Thread
$17.72

fancyboxy