Milwaukee 2551-22 Service Parts List
SERVICE PARTS LIST
notch in the gear case to install.
SPECIFY CATALOG NO. AND SERIAL NO. WHEN ORDERING PARTS
M12™ FUEL™ SURGE™ 1/4" Hex Hydraulic Driver
EXAMPLE:
00
Component Parts (Small #)
0
Are Included When Ordering
The Assembly (Large #).
11
8
7
6
4
3
2
1
FIG. PART NO. DESCRIPTION OF PART NO. REQ.
1 34-60-0725 'C' Retaining Ring (1)
2 45-88-1881 Double Chamfer Washer (1)
3 40-50-1470 Spring (1)
4 45-22-2643 Sleeve (1)
5 02-02-0170 3.5mm Steel Ball (1)
6 40-50-0008 Anvil Spring (1)
7 34-60-0002 Retaining Ring (1)
8 45-88-0177 Washer (1)
9 --------------- Ball Bearing (1)
10 --------------- Front Gear Case with Ball Bearing (1)
11 42-92-0056 Gear Case Cover (1)
28 --------------- Planetary Gear (3)
30 --------------- Ball Bearing (1)
40 06-82-0079 M3 x 22mm Pan Hd. ST T-10 Screw (1)
41 06-82-6351 M3 x 16mm Pan Hd. ST T-10 Screw (7)
42 23-28-0012 Light Pipe (1)
43 --------------- Housing Cover - Right Housing (1)
44 45-24-2553 Forward/Reverse Shuttle (1)
45 --------------- Housing Support - Left Housing (1)
46 42-70-0058 Housing Clip (1)
47 --------------- Belt Clip (1)
48 05-88-1015 M2.5 x 6mm Pan Hd. Phillips Mach. Sc (1)
49 --------------- Fuel Gauge Label (1)
50 14-30-0028 Front Gear Case Assembly (1)
51 14-46-0004 Pulse Unit (Sealed System) (1)
52 14-30-0123 Gear Case End Cap Assy. with Gears (1)
53 44-66-0037 Gear Case End Cap with Ball Bearing (1)
54 14-20-2555 Electronics Assembly (1)
55 16-01-1046 Rotor Assembly (1)
CATALOG NO. 2551-20
58
40
60
43
62
9 10
50
11 62
10
9
6
51
5
51
BULLETIN NO.
54-26-0005
REVISED BULLETIN
STARTING
SERIAL NO.
41
(7x)
40 41 42 43 45
57
46 49 58 59
29
53
30
52
28
5
28
FIG. PART NO. DESCRIPTION OF PART NO. REQ.
56 42-70-0495 Belt Clip Kit (1)
57 31-44-2551 Housing Kit (1)
58 12-20-1551 Service Nameplate (1)
59 10-20-2553 Spanish/French Warning Label (1)
60 42-55-2551 Zippered Tool Bag (1)
62 45-88-1882 Nylon Gearcase Washer (1)
When servicing, remove 90-95% of the existing grease
prior to installing Type ‘J’. Original grease maybe similar
in color but not compatible with ‘J’.
FIG. LUBRICATION
(Type 'J' Grease, No. 49-08-4220):
10 Coat anvil opening in the front of the gear case with grease.
51 Lightly coat front washer surface of Pulse Unit (51) with
grease, place a dab in the ball slot of anvil.
28,53 Lightly coat the inside gear teeth of ring gear end cap (53)
and the gear teeth of the planet gears (28) with grease.
55 Coat pinion of rotor assembly (55) with grease.
28 29
30
K42A
55
30
29
29
51
54
42
44
45
46
NOTE:
Assemble the three planet gears (28) on
posts of pulse unit (51). Place gearcase
end cap (53) onto pulse unit. Turn anvil
on pulse unit to rotate gears to seat end
cap properly. Align tab on end cap with
WIRING INSTRUCTION
SEE PAGE 2
59
MILWAUKEE TOOL l www.milwaukeetool.com
13135 W. LISBON RD., BROOKFIELD, WI 53005
DATE
Apr. 2019
49
56
47
Drwg. 2
47
48
48
Prior to installing Stator/Rotor Assemblies, place the
Selector PCBA into the slotted Housing Support cavity.
Press wires into channel as shown. Carefully place
Stator/Rotor Assemblies into Housing Support, being
sure all components are firmly and squarely seated.
Stator
Ground
Terminal
Selector PCBA
Rotor
Gear Case Assembly
Main PCBA
LED
Assembly
Forward/Reverse
Shuttle
On-Off Switch
Battery Terminal Block
Connector
Housing Support
Housing Clip to be placed here
Prior to installing the Gear Case Assembly, be sure all
elements of the Electronics Assembly are seated properly
(Stator, Main PCBA, Selector PCBA, On-Off Switch, LED
Assembly and Battery Terminal Block Connector). Be sure the
Grounding Terminal is in place and that all wires are pressed
down into all wire traps and channels. Check to assure that
wires will not interfere with moving parts.
Prior to installing the Housing Cover, place Forward/Reverse
Shuttle onto On-Off Switch and through Housing Support
opening. Check to assure that wires will not be pinched.
Secure the Housing Cover to the Housing Support with seven
M3 x 16mm ST T-10 Screws. Be sure to replace the Housing
Clip at the bottom of the battery opening.
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