Milwaukee Service Parts Bulletin

Model: 18 Gauge Shear 6852-20

Bulletin No.: 54-44-0551

Revised Bulletin: 54-44-0550

Date: Oct. 2019

Wiring Instruction: 58-01-1805

Serial Number Prefix & Break: A60B

General Information

Specify Catalog No. and Serial No. when ordering parts.

Example: Component Parts (Small #) are included when ordering the Assembly (Large #).

Parts List

Fig.	Part No.	Description of Part	No. Req.	Fig.	Part No.	Description of Part	No. Req.
1	02-04-0640	Ball Bearing	(1)	37	43-84-0460	Knurled Insert	(3)
2	02-04-0645	Ball Bearing	(1)	38	06-75-2115	10-24 x 1-1/4 Skt. Hd. Cap Screw	(3)
3	02-04-0852	Ball Bearing	(1)	39	48-44-0170	Blade - Right Side	(1)
★4	02-04-1020	Ball Bearing	(1)	40	42-40-0520	Bushing	(2)
5	02-50-1611	Needle Bearing	(1)	41	48-44-0150	Blade Center	(1)
6	02-50-2400	Needle Bearing	(1)	42	48-44-0160	Blade Left Side	(1)
7	06-82-7275	7-18 x .75 Slotted Plastite T-20	(6)	43	43-76-0400	Shear Housing	(1)
8	45-30-0035	Slug	(1)	44	49-96-0070	5/32 Hex Allen Wrench (Not Shown)	(1)
9	12-99-2665	Service Nameplate	(1)
10	48-08-0500	Shear Head Assy. (Includes 35 thru 44)	(1)
11	16-10-2210	Armature Assembly	(1)
12	18-07-2206	Field	(1)
13	22-18-1210	Brush Card Assembly	(1)
14	22-64-6510	Cord Set	(1)
15	23-66-2587	Switch	(1)
★16	28-14-2394	Gearcase	(1)
17	28-28-2320	Diaphragm	(1)
18	31-15-2010	Handle Halve	(1)
19	31-50-2010	Motor Housing	(1)
20	32-40-0100	Intermediate Gear	(1)
21	32-75-0115	Spindle gear	(1)
22	34-80-1400	Retaining Ring	(1)
23	36-66-0125	Intermediate Pinion	(1)
24	38-50-5754	Spindle	(1)
25	42-14-0450	Baffle Assembly	(1)
26	43-44-0985	Gasket	(1)
27	44-76-0210	Cord Protector	(1)
★29	45-88-0396	Chuck Washer	(1)
30	45-88-7990	Thrust Washer	(1)
31	45-30-0030	Slug	(1)
32	22-84-0845	Fan	(1)
33	22-18-1310	Brush Assembly	(1)
34	23-52-1610	Brush Spring	(1)
35	45-88-7310	Washer	(1)
36	43-16-0100	Eccentric Assembly	(1)

Lubrication

Fig. 16: Place 5 grams (3/16 oz.) of Type "Y" Grease, No. 49-08-5270 on top of the inserted intermediate ball bearing (1) and on the intermediate pinion (23). After inserting the balance of the gearing mechanism (20, 30, 28 and 21), place 13 grams (1/2 oz.) of "Y" Grease at the armature pinion centerline in the gearcase and fill to the top of the intermediate gear (20). Grease must contact at least 25% of the intermediate gear teeth.

Fig. 5, 6, 17: During assembly, use a dab of Type "E" Grease, No. 49-08-4122 to lubricate flats, pivot hole and sides of center blade (41), eccentric assembly (36) and bushing (40).

Before assembly, lightly coat all press fit areas with lightweight spindle oil.

Notes

Needle bearings to be pressed flush to .010 under flush from the end which has the vendors identification.

Servicing Shear Head Assembly No. 48-08-0500

When servicing the Shear Head Assembly No. 48-08-0500, pay close attention to the placement of the Bushings. One bushing is to be placed in the hole of the Center Blade and held in place with the front most screw on the Shear Housing. The other bushing is to be located below the small concave notch of the Center Blade and secured with the middle screw on the Shear Housing.

Prior to assembly, it is recommended to use Type 'E' Grease, No. 49-08-4122 on the following areas: Place a dab of grease in the pivot (bushing) hole and on the bushing notch of the Center Blade. Place a dab of grease on the rear flats of the Center Blade. Coat both bushings completely with grease. Place a liberal amount of grease on the entire Eccentric Assembly.

Diagram: Bottom view of Shear Head Assembly showing bushing placement.

Removing Shear Head Assembly From Tool

Front View: Illustration shown without tool attached for clarity of spreader wrench placement on shear head.

Prior to using the spreader wrench, this screw must be loosened two turns. Remove this screw.

Insert the end of the spreader wrench into the bottom rear opening of the shear head assembly as shown. Twist the wrench in a clockwise direction (allowing the rounded cam to roll and spread the back of the shear housing). The spreader wrench will rotate approximately 1/4 turn and stop at the next flat after the cam. To remove the spreader tool, turn counter-clockwise.

Diagram: Illustration showing the process of removing the shear head assembly using a spreader wrench.

Service Tools

Spreader Wrench No. 61-30-0300 for 14 Gauge Shear Head 48-08-0505 used on Shear No. 2636-20
Spreader Wrench No. 61-30-0300 for 18 Gauge Shear Head 48-08-0507 used on Shear 2637-20
Spreader Wrench No. 61-30-0310 for 18 Gauge Shear Head 48-08-0500 used on Shears 2635-20 and 6852-20

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