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  Milwaukee 5378-21 1/2" Hammer Drill Parts
Milwaukee 1/2

Milwaukee 1/2" Hammer Drill Replacement Parts For Model 5378-21

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Page A
Milwaukee 5378-21 1/2
 Fig #
1
Chuck Screw
 $4.99

Part Number:05-88-1500

In Stock

In Stock
 $4.99
In Stock
 $4.99
2
Chuck Key
 $10.44

Part Number:48-66-3280

In Stock

In Stock
 $10.44
In Stock
 $10.44
3
1/2 Chuck
 $88.42

Part Number:48-66-1355

In Stock

In Stock

Note: Incl. Chuck Key
 $88.42
In Stock
 $88.42
4
Gearcase Assembly
 $34.74

Part Number:28-14-5382

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days

Note: Incl. Needle Bearing, Fixed Ratchet and Shifting Assy.
 $34.74
Usually ships in 7 - 12 business days
 $34.74
5
M4 X 52 Pan Hd. St T-20 Screw
 $3.99

Part Number:06-81-5380

In Stock

In Stock
 $3.99
In Stock
 $3.99
6
Washer
 $3.99

Part Number:45-88-5381

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
7
Pin
 $3.99

Part Number:44-94-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
8
1st And 2nd Spindle Gear Assem
 $22.40

Part Number:14-29-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $22.40
Usually ships in 7 - 12 business days
 $22.40
9
Washer
 $3.99

Part Number:45-88-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
10
Thrust Bearing
 $3.99

Part Number:02-80-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
11
Spring
 $3.99

Part Number:40-50-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
12
Steel Ball
 $3.99

Part Number:02-02-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
13
Pin
 $3.99

Part Number:44-60-5381

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
14
Gear Shaft Assembly
 $52.30

Part Number:14-29-5379

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $52.30
Usually ships in 7 - 12 business days
 $52.30
15
Ball Steel 3.0 Mm
 $3.99

Part Number:02-02-0165

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
16
Rubber Seal
 $3.99

Part Number:43-44-5381

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
17
Selector Housing Assembly
 $6.48

Part Number:14-34-5382

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $6.48
Usually ships in 7 - 12 business days
 $6.48
18
Ring Retaining 32mm
 $3.99

Part Number:34-80-5380

In Stock

In Stock
 $3.99
In Stock
 $3.99
19
Seal
 $3.99

Part Number:43-44-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
20
Washer
 $3.99

Part Number:45-88-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
21
Felt Seal
 $3.99

Part Number:43-44-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
22
Speed Selector Key
 $3.99

Part Number:43-96-5380

In Stock

In Stock
 $3.99
In Stock
 $3.99
23
Grease Plate
 $3.99

Part Number:44-66-5381

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
24
Gasket
 $3.99

Part Number:43-44-5379

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
25
M3.5 X 12 T-10 Screw
 $3.99

Part Number:05-88-5380

In Stock

In Stock
 $3.99
In Stock
 $3.99
26
Pinion Support
 $3.99

Part Number:42-36-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
27
Diaphragm Assembly
 $12.82

Part Number:28-14-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days

Note: Incl. Washer and Bearings
 $12.82
Usually ships in 7 - 12 business days
 $12.82
28
Rubber Knock
 $3.99

Part Number:42-34-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
29
Rubber Seal Ring
 $3.99

Part Number:43-44-5377

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
30
Fan Baffle Assembly
 $3.99

Part Number:14-34-5383

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
31
Armature Assembly
 $65.42

Part Number:16-07-5376

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $65.42
Usually ships in 7 - 12 business days
 $65.42
32
Field
 $42.90

Part Number:18-07-5376

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $42.90
Usually ships in 7 - 12 business days
 $42.90
33
Shifting Clip
 $3.99

Part Number:44-66-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
34
Motor Housing
 $7.77

Part Number:31-50-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $7.77
Usually ships in 7 - 12 business days
 $7.77
35
M3 X 6mm Pan Hd. Phillips St S
 $3.99

Part Number:06-81-5381

In Stock

In Stock
 $3.99
In Stock
 $3.99
36
Pressure Plate
 $4.99

Part Number:44-66-5379

In Stock

In Stock
 $4.99
In Stock
 $4.99
37
Carbon Brush Assembly
 $5.63

Part Number:22-22-5380

In Stock

In Stock

Note: Incl. Spring and Holder
 $5.63
In Stock
 $5.63
38
Carbon Brush Assembly
 $4.99

Part Number:22-22-5381

In Stock

In Stock

Note: Incl. Spring and Holder
 $4.99
In Stock
 $4.99
41
Switch
 $26.30

Part Number:23-66-5381

In Stock

In Stock
 $26.30
In Stock
 $26.30
42
Rear Handle Assembly
 $12.56

Part Number:14-34-5378

In Stock

In Stock
 $12.56
In Stock
 $12.56
43
M4 X 16 T-20 Screw
 $4.99

Part Number:05-88-1200

In Stock

In Stock
 $4.99
In Stock
 $4.99
44
Spindle Shaft
 $18.78

Part Number:38-50-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $18.78
Usually ships in 7 - 12 business days
 $18.78
45
Cord Protector
 $4.99

Part Number:44-76-0210

In Stock

In Stock
 $4.99
In Stock
 $4.99
46
Cord Set
 $17.26

Part Number:22-64-5378

In Stock

In Stock
 $17.26
In Stock
 $17.26
47
Carrying Case
 $39.75

Part Number:42-55-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $39.75
Usually ships in 7 - 12 business days
 $39.75
48
Side Handle
 $4.99

Part Number:31-05-5379

In Stock

In Stock
 $4.99
In Stock
 $4.99
49
Steel Washer
 $3.99

Part Number:45-88-5377

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
50
Side Handle Carrier Assembly
 $5.42

Part Number:14-34-5374

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $5.42
Usually ships in 7 - 12 business days
 $5.42
51
Depth Gauge
 $26.03

Part Number:44-94-5381

In Stock

In Stock
 $26.03
In Stock
 $26.03
52
M8 X 53 Bolt
 $3.99

Part Number:05-81-5378

In Stock

In Stock
 $3.99
In Stock
 $3.99
53
Side Handle Clamping Band
 $3.99

Part Number:40-50-5370

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
54
Side Handle Assembly
 $15.61

Part Number:14-34-5373

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $15.61
Usually ships in 7 - 12 business days
 $15.61
55
Ball Bearing
 $3.99

Part Number:02-04-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
56
Rotating Ratchet
 $3.99

Part Number:44-84-5380

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
61
Ball Bearing
 $3.99

Part Number:02-04-5381

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
62
Ball Bearing
 $3.99

Part Number:02-04-5382

In Stock

In Stock
 $3.99
In Stock
 $3.99
800
Service Nameplate Kit
 $3.99

Part Number:12-20-5378

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
800
Chuck Key Holder
 $5.32

Part Number:48-66-4040

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $5.32
Usually ships in 7 - 12 business days
 $5.32
800
Red Brush Leadwire Assy.
 $3.99

Part Number:23-94-5381

Usually ships in 7 - 12 business days

Usually ships in 7 - 12 business days
 $3.99
Usually ships in 7 - 12 business days
 $3.99
800
Black Brush Leadwire Assy.
 $3.99

Part Number:23-94-5379

In Stock

In Stock
 $3.99
In Stock
 $3.99
800
Type P Grease (1.5 Oz.)
 $8.59

Part Number:49-08-4250

In Stock

In Stock
 $8.59
In Stock
 $8.59
800
Apply Thin Coat Type Obsolete - Not Available
 $11.06

Part Number:49-08-0150

Discontinued

Discontinued
 $11.06
Discontinued
Page B
Milwaukee 5378-21 1/2
 Fig #
 Fig #
Drill Parts  Hammer Drill Parts

Repair Guides for Milwaukee 1/2" Hammer Drill 5378-21

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This article is a 101 repair guide for power tool switch replacements, explaining the general steps involved in replacing a switch assembly.

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This article defines the basic parts of most power tools, explains how they work, and what to look for when they stop working.

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This article is a troubleshooting guide for problems and malfunctions common to most electric power tools.

Questions & Answers for Milwaukee 5378-21

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