Part Location Diagram of 42-66-0900 Milwaukee Chuck Assembly
See part 5 in the diagram
Replacing your Milwaukee Electric Drill Chuck Assembly
( Grid squares measure 1x1 inch )

Chuck Assembly 42-66-0900

Manufactured by:
Milwaukee
ERP Number:
ERP10129279
Part Number:
42-66-0900
Original Equipment Manufacturer ?
On Order

Easy 

15 - 30 mins 

(14 rated repairs) ?

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Product Description

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This drill chuck assembly is specially designed for use with Milwaukee compact driver drills. Its purpose is to secure drill bits. It is a keyless chuck that allows for quick and easy bit swap. The ratcheting action clicks the jaws tightly into place for reduced bit slippage. If your drill's bit retention is suffering, the rotation feels stiff, or the chuck has seized up entirely, a new chuck should fix the problem. Please note the screw used to secure this chuck it is sold separately. To complete this simple repair you should only need a screwdriver. • Make sure the unit is unplugged • Remove the chuck retaining screw • Remove old chuck and secure the new one • Tighten the chuck retaining screw • Test the tool

Troubleshooting

This part works with the following brands:
  • Milwaukee
This part works with the following products:
  • Electric Drill

Videos For installing this part.

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Replacing your Chuck Assembly
Replacing your Chuck Assembly

Customer Part Reviews

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Questions & Answers

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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 

(14 rated repairs) ?
  • 1
  • 2
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The chuck don\'t close very well

Francisco from Winder, Georgia

6 of 6 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
42-66-0900
I watched the ereplacement video on You Tube. It made replacing the chuck much easier than I though it would be. I copied it for those that need to see it.

https://www.youtube.com/watch?v=usC8unA5RiA
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THE CHUCK ON MY MILWAUKEE DRILL WOULDN\'T HOLD TIGHT ANY MORE, SO I REPLACED IT.

BRUCE from LEMONT, Illinois

4 of 4 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
42-66-0900, 05-88-1500
FIRST , I REMOVED THE SCREW INSIDE THE CHUCK, TURNING CLOCKWISE. THEN I INSERTED A LARGE HEX WRENCH IN THE CHUCK, TIGHTENED IT, THEN HIT IT WITH A HAMMER, THE CHUCK CAME LOOSE, AND I TOOK IT OFF. NEXT I SCREWED THE NEW CHUCK ON THE DRILL, INSERTED THE SCREW AND TIGHTENED IT COUNTER-CLOCKWISE, NICE AND TIGHT. THE JOB IS DONE.
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Chuck Assembly was wobbling, Brush Card Assembly was bad it was smoking, added bit holder and belt hook

Jeremy from Springfield, Ohio

3 of 3 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Removed Chuck Assembly screw with screwdriver and put allen wrench in Chuck Assembly put drill in low gear smacked allen wrench with hammer Chuck Assembly came right off.
Removed back of drill for Brush Card Assembly then opened drill shell unsoldered two wires from trigger soldered in the two wires on the new Brush Card Assembly re assembled drill shell put new Chuck Assembly on in reverse order, added Belt Hook with one Pan Head Screw and bit holder with one Pan Head Screw.
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Chuck would not turn

Richard from VENICE, Florida

1 person found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Socket set, Wrench set
Parts Used:
42-66-0900, 05-88-1500
Had to drill out screw that held chuck
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broken sleeve,bad chuck assemly

THANH from Silver Spring, Maryland

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Parts Used:
45-22-0825, 42-66-0900
removed old one and put the new one. Less than 10 min., done
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Serations inside chuck were worn out allowing drill bits to stop while drilling

Melvin from NASHVILLE, Illinois

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
42-66-0900
I first removed the screw that was at the bottom of the drill chuck. Which is a left handed thread. I then took a 3/8th allen wrench and put the short end where the drill bit would normally go. I then took a rubber mallot and hit the long end of the allen wrench to break the drill chuck loose. The threads on the chuck are right handed. It broke loose and all I had to do is unscrew it. The only other thing I did was put locktite on the screw I took out and put the left handed screw back in. It works fine now. Just to clarify the left handed screw is removed from the center of the drill chuck with the chuck opened all the way and the screw takes a large phillips screwdriver to remove it
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The chuck broke internally and had to be replaced.

Vernon from Bismarck, North Dakota

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers, Wrench (Adjustable)
Parts Used:
42-66-0900
I followed the ereplacement video and unscrewed the old chuck and screwed on the new. The video was very helpful.
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Chuck screw broke

Michael from Fond du Lac, Wisconsin

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
42-66-0900, 05-88-1500
Removed old chuck screw, replaced the chuck and screw and all is well.
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Chuck hard to turn

Fred from CANTERBURY, New Hampshire

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Wrench (Adjustable)
Parts Used:
42-66-0900
Clamped drill to worktable. Used large channel locks to open sticky chuck. Removed left hand threaded screw (right to loosen) from inside chuck opening. Used channel lock pliers to lock a large allen wrench in chuck. Used adjustable wrench to grab allen wrench and unscrew chuck. Install new chuck.
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The chuck wouldn\'t tighten past halfway down.

Leslie from Sandy, Utah

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Parts Used:
42-66-0900, 05-88-1500
1. Secure the drill in a vice.
2. Unscrew the retaining Phillips screw located inside the chuck by gently using the impact drill. The screw is left handed.
3. Secure an 3/8\" Allen wrench in the chuck.
4. Quickly hit the Allen wrench and the chuck unscrewed from the drill.
5. Screw the new chuck on the drill. ... Read more >6. Tighten the left handed screw securely inside the chuck.
7. Job completed.
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Model Cross Reference

This part works with the following models:
ERP Number: ERP10129279
Manufacturer Part Number: 42-66-0900
Brand Model Number Description
Milwaukee 2601-059 Electric Drill - 1/2" Compact Driver Drill
Milwaukee 2601-20 Electric Drill - 1/2" Compact Driver Drill
Milwaukee 2601-21 Cordless Drill - 1/2" Compact Driver Drill
Milwaukee 2601-22 Electric Drill - 1/2" Compact Driver Drill