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Makita HR3851 Rotary Hammer

Makita HR3851 Rotary Hammer Parts

Page A
 Fig #
1
Needle Bearing 4516
 $27.38

Part Number:212551-3

In Stock, 2 available

In Stock, 2 available
 $27.38
In Stock, 2 available
 $27.38
2
Flat Washer 40
 $12.64

Part Number:267057-6

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $12.64
Ships in 1 - 14 business days
 $12.64
3
Barrel
 $74.83

Part Number:311674-5

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $74.83
Ships in 1 - 14 business days
 $74.83
4
O Ring 56
 $2.99

Part Number:213655-4

In Stock, 25+ available

In Stock, 25+ available
 $2.99
In Stock, 25+ available
 $2.99
5
Needle Bearing 4516
 $27.38

Part Number:212551-3

In Stock, 2 available

In Stock, 2 available
 $27.38
In Stock, 2 available
 $27.38
6
Flat Washer 45
 $9.51

Part Number:253832-6

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $9.51
Ships in 1 - 14 business days
 $9.51
7
Spiral Bevel Gear 36
 $47.56

Part Number:221347-1

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $47.56
Ships in 1 - 14 business days
 $47.56
8
Striker
 $19.72

Part Number:321369-2

In Stock, 2 available

In Stock, 2 available
 $19.72
In Stock, 2 available
 $19.72
9
Piston Ring 34
 $13.69

Part Number:412038-7

In Stock, 13 available

In Stock, 13 available
 $13.69
In Stock, 13 available
 $13.69
10
Inner Ring 30
 $16.70

Part Number:412041-8

In Stock, 2 available

In Stock, 2 available
 $16.70
In Stock, 2 available
 $16.70
11
Piston Ring 34
 $13.69

Part Number:412038-7

In Stock, 13 available

In Stock, 13 available
 $13.69
In Stock, 13 available
 $13.69
12
Inner Ring 30
 $4.52

Part Number:341743-8

In Stock, 5 available

In Stock, 5 available
 $4.52
In Stock, 5 available
 $4.52
13
Pin 8
 $3.99

Part Number:256029-6

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $3.99
Ships in 1 - 14 business days
 $3.99
15
Crank Cap
 $9.05

Part Number:155981-4

In Stock, 3 available

In Stock, 3 available
 $9.05
In Stock, 3 available
 $9.05
16
O Ring 60
 $3.99

Part Number:213654-6

In Stock, 11 available

In Stock, 11 available
 $3.99
In Stock, 11 available
 $3.99
17
Rod
 $22.74

Part Number:312956-8

In Stock, 1 available

In Stock, 1 available
 $22.74
In Stock, 1 available
 $22.74
18
Needle Bearing 1212
 $15.20

Part Number:212108-0

In Stock, 9 available

In Stock, 9 available
 $15.20
In Stock, 9 available
 $15.20
19
Crank Shaft
 $36.42

Part Number:321726-4

In Stock, 4 available

In Stock, 4 available
 $36.42
In Stock, 4 available
 $36.42
20
Woodruff Key 4
 $2.99

Part Number:254001-2

In Stock, 25+ available

In Stock, 25+ available
 $2.99
In Stock, 25+ available
 $2.99
21
Retaining Ring R-47
 $2.99

Part Number:962203-3

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $2.99
Ships in 1 - 14 business days
 $2.99
22
Ball Bearing 6204LLU
 $18.21

Part Number:211324-1

Discontinued

Discontinued
 $18.21
Discontinued
23
O Ring 48
 $3.99

Part Number:213606-7

In Stock, 1 available

In Stock, 1 available
 $3.99
In Stock, 1 available
 $3.99
24
Crank Housing
 $84.05

Part Number:157307-6

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $84.05
Ships in 1 - 14 business days
 $84.05
25
Helical Gear 33
 $22.27

Part Number:221689-3

In Stock, 8 available

In Stock, 8 available
 $22.27
In Stock, 8 available
 $22.27
26
Needle Bearing 1210
 $7.66

Part Number:212102-2

In Stock, 3 available

In Stock, 3 available
 $7.66
In Stock, 3 available
 $7.66
27
Needle Bearing 2216
 $15.20

Part Number:212359-5

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $15.20
Ships in 1 - 14 business days
 $15.20
29
Torque Limiter Assembly
 $190.28

Part Number:134527-9

In Stock, 1 available

In Stock, 1 available
 $190.28
In Stock, 1 available
 $190.28
34
Thin Washer 15
 $2.99

Part Number:253314-8

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $2.99
Ships in 1 - 14 business days
 $2.99
35
O-Ring
 $3.99

Part Number:421689-5

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $3.99
Ships in 1 - 14 business days
 $3.99
36
Cup Washer 4
 $2.03

Part Number:654031-7

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $2.03
Ships in 1 - 14 business days
 $2.03
37
Flat Washer 4
 $2.03

Part Number:654032-5

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $2.03
Ships in 1 - 14 business days
 $2.03
38
Pan Head Screw M4X8
 $2.99

Part Number:652014-1

In Stock, 3 available

In Stock, 3 available
 $2.99
In Stock, 3 available
 $2.99
39
Gear Housing Obsolete - Not Available
 $51.12

Part Number:157369-4

Discontinued

Discontinued
 $51.12
Discontinued
40
Rubber Pin 6
 $2.99

Part Number:263005-3

In Stock, 9 available

In Stock, 9 available
 $2.99
In Stock, 9 available
 $2.99
41
Stop Ring E-4
 $2.99

Part Number:961011-9

In Stock, 10 available

In Stock, 10 available
 $2.99
In Stock, 10 available
 $2.99
43
Needle Bearing 609
 $10.67

Part Number:212011-5

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $10.67
Ships in 1 - 14 business days
 $10.67
44
O Ring 10
 $3.99

Part Number:213055-8

In Stock, 14 available

In Stock, 14 available
 $3.99
In Stock, 14 available
 $3.99
45
Change Shaft
 $22.74

Part Number:321727-2

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $22.74
Ships in 1 - 14 business days
 $22.74
46
Plate
 $3.02

Part Number:342786-3

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $3.02
Ships in 1 - 14 business days
 $3.02
47
Steel Ball 4.8
 $3.99

Part Number:216002-8

In Stock, 2 available

In Stock, 2 available
 $3.99
In Stock, 2 available
 $3.99
48
Compression Spring 3
 $3.99

Part Number:231317-2

In Stock, 1 available

In Stock, 1 available
 $3.99
In Stock, 1 available
 $3.99
49
Change Lever
 $3.99

Part Number:410331-3

In Stock, 11 available

In Stock, 11 available
 $3.99
In Stock, 11 available
 $3.99
50
Flat Washer 4
 $3.99

Part Number:941052-1

In Stock, 13 available

In Stock, 13 available
 $3.99
In Stock, 13 available
 $3.99
52
Hex. Socket Head Bolt M4X16
 $3.99

Part Number:922126-7

In Stock, 25+ available

In Stock, 25+ available
 $3.99
In Stock, 25+ available
 $3.99
53
Spring Washer 5
 $3.99

Part Number:942101-7

In Stock, 2 available

In Stock, 2 available
 $3.99
In Stock, 2 available
 $3.99
54
Hex. Socket Head Bolt M5X12
 $3.99

Part Number:922212-4

In Stock, 2 available

In Stock, 2 available
 $3.99
In Stock, 2 available
 $3.99
55
Piston
 $18.21

Part Number:321370-7

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $18.21
Ships in 1 - 14 business days
 $18.21
56
Key 4
 $2.99

Part Number:254231-5

In Stock, 8 available

In Stock, 8 available
 $2.99
In Stock, 8 available
 $2.99
57
Cylinder Liner
 $164.94

Part Number:152335-6

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $164.94
Ships in 1 - 14 business days
 $164.94
58
Impact Bolt
 $27.14

Part Number:323718-9

In Stock, 1 available

In Stock, 1 available
 $27.14
In Stock, 1 available
 $27.14
59
Steel Ball 7.9
 $2.99

Part Number:216004-4

In Stock, 10 available

In Stock, 10 available
 $2.99
In Stock, 10 available
 $2.99
60
X Ring 28
 $27.26

Part Number:213428-5

In Stock, 3 available

In Stock, 3 available
 $27.26
In Stock, 3 available
 $27.26
61
O Ring 27
 $3.99

Part Number:213411-2

In Stock, 5 available

In Stock, 5 available
 $3.99
In Stock, 5 available
 $3.99
62
O Ring 27
 $3.99

Part Number:213411-2

In Stock, 5 available

In Stock, 5 available
 $3.99
In Stock, 5 available
 $3.99
63
O Ring 50
 $3.99

Part Number:213604-1

In Stock, 14 available

In Stock, 14 available
 $3.99
In Stock, 14 available
 $3.99
64
Tool Holder Obsolete - Not Available
 $117.42

Part Number:322221-7

Discontinued

Discontinued
 $117.42
Discontinued
64
Tool Holder
 $90.23

Part Number:323717-1

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $90.23
Ships in 1 - 14 business days
 $90.23
65
Steel Ball 7.9
 $2.99

Part Number:216004-4

In Stock, 10 available

In Stock, 10 available
 $2.99
In Stock, 10 available
 $2.99
66
Tool Retainer(You May Need 265890-0 Bolt and 231375-8 Spring
 $19.72

Part Number:331301-8

In Stock, 12 available

In Stock, 12 available
 $19.72
In Stock, 12 available
 $19.72
68
Hex. Socket Head Bolt M6X25
 $2.99

Part Number:922341-3

In Stock, 7 available

In Stock, 7 available
 $2.99
In Stock, 7 available
 $2.99
69
O Ring 32
 $2.99

Part Number:213459-4

In Stock, 3 available

In Stock, 3 available
 $2.99
In Stock, 3 available
 $2.99
70
Ball Bearing
 $13.57

Part Number:211106-1

In Stock, 8 available

In Stock, 8 available
 $13.57
In Stock, 8 available
 $13.57
71
Oil Seal 14
 $21.23

Part Number:213160-1

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $21.23
Ships in 1 - 14 business days
 $21.23
72
Fan 94
 $9.05

Part Number:241634-2

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $9.05
Ships in 1 - 14 business days
 $9.05
73
Armature Assembly 115V
 $186.87

Part Number:514771-8

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $186.87
Ships in 1 - 14 business days
 $186.87
74
Insulation Washer
 $3.99

Part Number:681635-2

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $3.99
Ships in 1 - 14 business days
 $3.99
75
Ball Bearing
 $11.37

Part Number:211066-7

In Stock, 25+ available

In Stock, 25+ available
 $11.37
In Stock, 25+ available
 $11.37
75
Ball Bearing 6200DDW
 $13.57

Part Number:211087-9

In Stock, 10 available

In Stock, 10 available
 $13.57
In Stock, 10 available
 $13.57
76
O Ring 30
 $2.99

Part Number:213406-5

In Stock, 3 available

In Stock, 3 available
 $2.99
In Stock, 3 available
 $2.99
77
Baffle Plate
 $4.52

Part Number:410163-8

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $4.52
Ships in 1 - 14 business days
 $4.52
78
Hex. Bolt M5X45
 $3.25

Part Number:265347-1

In Stock, 2 available

In Stock, 2 available
 $3.25
In Stock, 2 available
 $3.25
79
Field Assembly 115V
 $74.47

Part Number:524631-6

In Stock, 6 available

In Stock, 6 available
 $74.47
In Stock, 6 available
 $74.47
82
Motor Housing
 $68.76

Part Number:159034-1

In Stock, 7 available

In Stock, 7 available
 $68.76
In Stock, 7 available
 $68.76
83
Brush Holder Cap
 $2.99

Part Number:643650-4

In Stock, 25+ available

In Stock, 25+ available
 $2.99
In Stock, 25+ available
 $2.99
84
Carbon Brush Set
 $15.54

Part Number:CB155

In Stock, 25+ available

In Stock, 25+ available
 $15.54
In Stock, 25+ available
 $15.54
85
Rear Cover
 $10.67

Part Number:284055-5

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $10.67
Ships in 1 - 14 business days
 $10.67
86
Spring Washer 5
 $3.99

Part Number:942101-7

In Stock, 2 available

In Stock, 2 available
 $3.99
In Stock, 2 available
 $3.99
87
Hex. Socket Head Bolt M5X16
 $2.99

Part Number:922222-1

In Stock, 1 available

In Stock, 1 available
 $2.99
In Stock, 1 available
 $2.99
88
Hex. Socket Head Bolt M6X55
 $3.99

Part Number:922376-4

In Stock, 2 available

In Stock, 2 available
 $3.99
In Stock, 2 available
 $3.99
90
Flat Washer 6
 $2.99

Part Number:941151-9

In Stock, 25+ available

In Stock, 25+ available
 $2.99
In Stock, 25+ available
 $2.99
91
Hex. Nut M6
 $3.99

Part Number:931302-2

In Stock, 23 available

In Stock, 23 available
 $3.99
In Stock, 23 available
 $3.99
92
Spring Washer 6
 $1.99

Part Number:253428-3

In Stock, 9 available

In Stock, 9 available
 $1.99
In Stock, 9 available
 $1.99
93
Flat Washer 6
 $2.99

Part Number:941151-9

In Stock, 25+ available

In Stock, 25+ available
 $2.99
In Stock, 25+ available
 $2.99
94
Pan Head Screw M5X25
 $2.99

Part Number:911243-8

In Stock, 20 available

In Stock, 20 available
 $2.99
In Stock, 20 available
 $2.99
96
Handle Set
 $24.24

Part Number:182564-7

In Stock, 3 available

In Stock, 3 available
 $24.24
In Stock, 3 available
 $24.24
97
Pan Head Screw M4X16
 $2.99

Part Number:911129-6

In Stock, 3 available

In Stock, 3 available
 $2.99
In Stock, 3 available
 $2.99
98
Dust Cover
 $3.99

Part Number:421265-5

In Stock, 3 available

In Stock, 3 available
 $3.99
In Stock, 3 available
 $3.99
99
Grip 32
 $22.74

Part Number:273472-4

In Stock, 5 available

In Stock, 5 available
 $22.74
In Stock, 5 available
 $22.74
100
Wing Bolt M6X18
 $3.99

Part Number:924321-5

In Stock, 6 available

In Stock, 6 available
 $3.99
In Stock, 6 available
 $3.99
101
Rubber Washer 5.5
 $3.99

Part Number:261049-7

In Stock, 2 available

In Stock, 2 available
 $3.99
In Stock, 2 available
 $3.99
102
Grip Base
 $7.66

Part Number:164543-7

In Stock, 4 available

In Stock, 4 available
 $7.66
In Stock, 4 available
 $7.66
103
Grip Holder
 $16.70

Part Number:164572-0

In Stock, 2 available

In Stock, 2 available
 $16.70
In Stock, 2 available
 $16.70
104
Hex. Socket Head Bolt M6X14
 $2.99

Part Number:922316-2

In Stock, 25 available

In Stock, 25 available
 $2.99
In Stock, 25 available
 $2.99
106
Cushion Plate
 $7.66

Part Number:343754-9

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $7.66
Ships in 1 - 14 business days
 $7.66
107
Handle Set
 $24.24

Part Number:182564-7

In Stock, 3 available

In Stock, 3 available
 $24.24
In Stock, 3 available
 $24.24
108
Handle Shaft
 $3.99

Part Number:321210-9

In Stock, 3 available

In Stock, 3 available
 $3.99
In Stock, 3 available
 $3.99
109
Cord Guard
 $2.99

Part Number:682503-2

In Stock, 10 available

In Stock, 10 available
 $2.99
In Stock, 10 available
 $2.99
109
Cord Guard 8
 $4.18

Part Number:682567-6

In Stock, 1 available

In Stock, 1 available
 $4.18
In Stock, 1 available
 $4.18
110
Power Supply Cord Unit
 $31.67

Part Number:664658-5

In Stock, 9 available

In Stock, 9 available
 $31.67
In Stock, 9 available
 $31.67
111
Strain Relief
 $3.99

Part Number:687001-1

In Stock, 11 available

In Stock, 11 available
 $3.99
In Stock, 11 available
 $3.99
112
Pan Head Screw M4X18
 $2.99

Part Number:911133-5

In Stock, 20 available

In Stock, 20 available
 $2.99
In Stock, 20 available
 $2.99
113
Pan Head Screw M4X8
 $2.99

Part Number:652014-1

In Stock, 3 available

In Stock, 3 available
 $2.99
In Stock, 3 available
 $2.99
114
Hex. Socket Head Bolt M6X25
 $2.99

Part Number:265914-2

In Stock, 22 available

In Stock, 22 available
 $2.99
In Stock, 22 available
 $2.99
116
Switch
 $42.45

Part Number:651145-3

In Stock, 17 available

In Stock, 17 available
 $42.45
In Stock, 17 available
 $42.45
118
Rubber Sheet
 $2.67

Part Number:423156-6

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $2.67
Ships in 1 - 14 business days
 $2.67
120
Rubber Ring 9
 $2.99

Part Number:262051-3

In Stock, 5 available

In Stock, 5 available
 $2.99
In Stock, 5 available
 $2.99
121
Rubber Ring 9
 $2.99

Part Number:262052-1

In Stock, 19 available

In Stock, 19 available
 $2.99
In Stock, 19 available
 $2.99
122
Sleeve 6
 $3.02

Part Number:257636-8

In Stock, 25+ available

In Stock, 25+ available
 $3.02
In Stock, 25+ available
 $3.02
Miscellaneous Parts
 Fig #
400
Plastic Carrying Case Comp. Obsolete - Not Available
 $80.03

Part Number:150589-9

Discontinued

Discontinued
 $80.03
Discontinued
401
Depth Gauge
 $7.66

Part Number:321248-4

Ships in 1 - 14 business days

Ships in 1 - 14 business days
 $7.66
Ships in 1 - 14 business days
 $7.66
403
Hex. Wrench 4
 $4.09

Part Number:783202-0

In Stock, 2 available

In Stock, 2 available
 $4.09
In Stock, 2 available
 $4.09
900
Compression Spring 15
 $2.99

Part Number:231375-8

In Stock, 17 available

In Stock, 17 available
 $2.99
In Stock, 17 available
 $2.99
901
Hex. Bolt M8X12
 $4.99

Part Number:265321-9

In Stock, 17 available

In Stock, 17 available
 $4.99
In Stock, 17 available
 $4.99
904
Cap
 $2.99

Part Number:421596-2

Discontinued

Discontinued
 $2.99
Discontinued
905
Spline to SDS Plus Obsolete - Not Available
 $216.60

Part Number:752117-A

Discontinued

Discontinued
 $216.60
Discontinued
906
Hammer Service Kit
 $35.84

Part Number:193281-4

In Stock, 6 available

In Stock, 6 available
 $35.84
In Stock, 6 available
 $35.84
Discuss  |  Repair Videos
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Power Tool Care and Maintenance 101

This article suggests guidelines for power tool care and maintenance. It also describes information tools available at eReplacementParts.com.

Accessories
Accessories for the Makita HR3851

Questions & Answers

What do you think when it stop hammering?
Felix Wernet for model number Hr3851 no. 24913e asked on 2019-07-25
Hello Felix, thank you for inquiring. If it doesn't hit or is not hitting hard enough, you will want to consider the Hammer Service Kit part number 193281-4 for your model. Good luck with your repair!
I need the spring and bolt that is at the other end of the retainer that locks the bit in place by turning to the red dot.is it part #265321-9 hex bolt and #231375-8 spring? thank you
gary for model number hr3851 asked on 2019-10-04
Hello Gary, thank you for writing. It looks to be Hex Socket Head Bolt part number 922126-7, and Compression Spring part number 231317-2. Good luck with your repair!
How to change bits cant get out
Greg for model number HR3581 asked on 2019-10-24
Hello Greg, Thank you for the question.For Installing or removing the bit, Press in the tool retainer and turn it until the red dots on the tool retainer and the tool holder are aligned. Release the tool retainer. Insert the bit into the tool holder as far as it will go. Press in he tool retainer and turn it a full 180 degrees. Then release it to secure the bit. To remove the bit, follow the installation procedure in reverse. Hope this helps!
Discussion
Discussion for the Makita HR3851 Rotary Hammer

Discussion is closed. To ask our experts a question about a part, use the Q&A feature on our product pages.
Question: Makitahr3851

deniser

Hammering intermittently - what part do I need
WJA
You made need the Hammer Service Kit, part number 193281-4
Question: Makita Hr3851

1198215

My drill will stop drilling if you apply very much pressure to it . What part do I need to replace?
Hi,
I sounds like your torque limiter is slipping.This is none repairable and needs to be replaced as 134527-9 Torque Limiter Assembly.Hope that helps.Good luck.
Tinker
WJA
Question: Hammer Service Kit 1932814

731313

Hello 731313,

The Makita service kit, part number 1932814 includes the o-rings, piston rings, brush set and grease.

-WJA
Question: Llorenzo

llorenzo

my 3851 lost power when is hammer, what part have to change to repair link removed thanks
Hi llorenzo,
That's one of the best rotor hammers made.I would put a service kit in it but I don't see one listed. email ereplacement parts here and see if they can find the number for the kit.Your striker is starting to freeze in the cylinder and its time to service the tool.Hope that helps.Good luck.
Tinker
WJA
Hello llorenzo

Makita does offer a service kit for the HR3851. It is part number 193281-4.

Hope this helps,
-WJA
Question: Rotary 3851

931559

Hi,
Your striker is starting to size in the cylinder.To see if this is the problem stand the nose od the tool up and put 10-15 drops of oil down the nose and let it sit over night.IF this fixes the problem then you will be in need of a service kit soon to prevent the problem from coming back again. Hope that helps.Good luck.
Tinker
WJA
Question: Smoked The Drill

nascar76

Hello JB,

The parts you are going to want to look at for burnt windings, parts that smell like the insulation has burnt, and discoloration are the following part numbers. Armature, part number 514771-8, Field assembly, part number 524631-6. And while your at it replace the brush set, part number CB155. While you have it torn down look for any worn parts especially in the hammer area of the tool.

-WJA
Question: 3851 Rotary Hammer

chip

will the tool holder screw into the barrel?
WJA
Hello Chip,

Yes the tool holder, part number 322221-7 does thread into the barrel, part number 311674-5.

WJA
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