Milwaukee 5303-20 Guide

54-24-0575
54-24-0576
1-1/8" ROTARY HAMMER 893B
Feb. 2006
5303-20 58-01-1130
FIG. PART NO. DESCRIPTION OF PART NO. REQ.
3 12-20-0407 Nameplate (1)
6 10-07-6215 Product Label (2)
8 45-88-1245 Washer (1)
9 44-90-0340 Snap Ring (Ext.) (1)
10 43-87-0080 Isolation Block (1)
102 31-15-0255 Brush Cover (2)
106 05-74-0685 Screw (4)
107 05-74-0715 Screw (2)
108 05-78-0715 Screw (3)
109 05-74-0695 Screw (2)
110 05-74-0700 Screw (2)
113 05-78-0745 Screw (4)
132 34-40-0145 O-Ring (1)
200 31-40-0040 Gearcase (1)
204 44-86-0625 Splined Retainer (1)
206 31-15-0305 Crankcase (1)
207 43-44-0375 Gasket (1)
208 45-88-8825 Washer (1)
209 34-40-4440 O-Ring (1)
210 02-80-6025 Thrust Bearing Set (1)
211 14-73-0246 Wobble Shaft Assembly (1)
212 36-66-3160 Reduction Gear Shaft (1)
214 45-88-1250 Washer (1)
215 40-50-8895 Spring (1)
216 45-22-0300 Coupling Sleeve (1)
217 45-88-1240 Washer (1)
218 36-92-0745 Wobble Plate (1)
219 32-60-2621 Reduction Gear (1)
220 32-60-2155 Offset Gear (1)
221 32-60-2165 Internal Gear (1)
222 44-82-0190 Ram (1)
223 --------------- Piston (1)
224 44-60-1405 Wrist Pin (1)
225 45-88-1180 Washer (2)
226 44-90-4500 Shift Ring (1)
227 34-40-4454 O-Ring (1)
228 44-60-1485 Pin (1)
229 44-66-6055 Retaining Plate (1)
232 --------------- Spindle (1)
233 40-50-7975 Belleville Spring (6)
234 45-88-7765 Stop Washer (1)
235 32-75-1205 Spindle Gear (1)
236 44-90-4510 Retaining Ring (Ext.) (1)
237 45-88-1255 Washer (1)
FIG. PART NO. DESCRIPTION OF PART NO. REQ.
238 02-80-0150 Thrust Washer (1)
239 45-88-0775 Locking Washer (1)
240 45-60-0495 Striker Support (1)
241 44-82-0085 Ram Catcher (1)
242 34-40-4451 O-Ring (1)
243 42-76-0725 Thrust Collar (1)
244 44-90-4415 Retaining Ring (1)
245 45-56-2535 Striker (1)
246 45-88-1260 Washer (1)
247 34-40-4452 O-Ring (1)
248 45-88-1265 Washer (1)
249 34-40-4453 O-Ring (1)
251 34-40-4459 O-Ring (1)
252 42-76-0265 Quik Change Collar (1)
253 44-90-0105 Ring (1)
254 02-02-0100 Ball (6)
255 40-50-8900 Spring (1)
256 44-90-0350 Snap Ring (Int.) (1)
257 44-90-0110 Ring (1)
258 40-50-8905 Spring (1)
259 45-88-1270 Washer (2)
260 45-88-1275 Washer (1)
267 05-77-0030 Bolt (1)
269 45-60-0511 Spindle Bearing Support (1)
270 44-90-0115 Ring (1)
274 34-40-4465 O-Ring (1)
420 36-66-4266 Intermediate Gear Set (1)
426 45-88-1170 Washer (1)
427 45-88-1175 Washer (2)
605 43-46-0170 Depth Gauge (1)
610 48-03-3040 Quik Change SDS-Plus Chuck (1)
700 48-55-5303 Carrying Case (1)
703 49-15-0305 Side Handle w/Depth Rod (1)
1202 44-10-0075 Shift Lever (1)
10-15-0270 Warning Tag (1)
14-46-5303 Lubrication Service Kit (1)
PAGE 1 OF 2
SEE BACK PAGE OF THIS BULLETIN
FOR ADDITIONAL LUBRICATION
AND SERVICE NOTES
REVISED BULLETIN
SERVICE PARTS LIST BULLETIN NO.
EXAMPLE:
Component Parts (Small #) Are Included
When Ordering The Assembly (Large #).
WIRING INSTRUCTION
DATE
0
00
CATALOG NO.
SPECIFY CATALOG NO. AND SERIAL NO. WHEN ORDERING PARTS
SERIAL
NUMBER
MILWAUKEE ELECTRIC TOOL CORPORATION
13135 W. LISBON RD., BROOKFIELD, WI 53005
Drwg. 4
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FIG. PART NO. DESCRIPTION OF PART NO. REQ.
4 22-64-0505 Cord Set 1
5 44-76-0285 Strain Relief 1
7 44-60-0015 Grooved Dowel Pin 1
100 31-50-0955 Motor Housing 1
101 31-15-0440 Motor Cover 1
103 31-44-2100 Handle Set 1
105 18-07-0121 Field - Service 1
111 05-74-0705 Screw 4
112 05-78-0720 Screw 2
114 05-78-0715 Screw 4
115 42-96-0170 Bearing Cup 1
116 31-05-0220 Air Deflector Ring 1
117 45-30-0210 Vinyl Slug 4
118 23-94-1030 Wire 1
119 23-94-1030 Wire 1
120 22-20-0230 Brush Holder 2
123 42-70-1100 Field Centering Clip 2
125 31-17-0240 Cord Clamp 1
127 45-30-0220 Slug 2
128 23-94-1035 Wire 1
129 23-94-1040 Wire 1
130 42-92-0015 Bearing Cover 1
135 23-66-1685 Switch 1
406 16-07-0121 Armature 1
407 22-84-0940 Fan 1
408 02-04-1800 Ball Bearing 1
409 02-04-1815 Ball Bearing 1
410 43-06-0135 Insulating Disc 1
411 44-90-4405 Retaining Ring 1
413 45-22-0465 Sleeve 1
414 45-36-1595 Spacer 1
420 36-66-4266 Intermediate Gear Set 1
1201 22-18-0940 Brush (2) Service Kit 1
Qty. Cat. No. Description
1 34-40-4452 O-ring
1 44-90-4415 Retaining Ring
1 34-40-4459 O-ring
1 42-76-0265 Quik Change Collar
1 34-40-4465 O-ring
1 22-18-0940 Brush Ser ice Kit (2)
1 44-10-0075 Shift Le er
2 05-81-0932 Switch Screws
1 45-30-0055 Silicone Slug
Qty. Cat. No. Description
1 49-08-4250 Type "P" Grease (1.5 oz.)
1 49-08-4255 Type "Q" Grease (1.5 oz.)
1 44-76-0285 Strain Relief
1 43-87-0080 Isolation Block
2 42-96-0170 Bearing Cup
1 43-44-0375 Gasket
2 45-88-1180 Washers
2 34-40-4454 O-ring
1 34-40-4451 O-ring
Service Kit 14-46-5303 Contains:
SEE BACK PAGE OF THIS BULLETIN
FOR ADDITIONAL LUBRICATION
AND SERVICE NOTES
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SERVICE NOTES:
5303-20
1. For any service that requires access into the gearcase, the shift lever must be removed. To remove, shift to the hammer and drill mode and
insert a screwdriver under the lever end and pry up. The lever will be destroyed and must be replaced.
2. To remove the gearcase, remove the retaining ring (256) with special pliers 46-59-9057 and remove it with the gearcase.
3. To remove the spindle, the two mounting bolts (110) must be removed with a metric allen wrench.
4. To remove the ram, tap the end of the striker with a hammer, this frees the ram from the ram catcher.
5. To remove the ram catcher, striker and striker support from the spindle, remove the internal retaining ring with a small screwdriver by pushing
on the ring through the two small ports in the spindle where the ring is visible. Push the ring in and towards the open end of the spindle. Press
out all internal parts.
6. To remove the rear thrust bearing, remove the spiral lock retaining ring with a screwdriver and then remove the thrust bearing.
7. To remove the spindle gear/clutch, press the spindle gear against the disk springs and remove the retaining ring that fits into the gear counter
bore. Once this retaining ring is removed, all of the parts will slip off of the spindle.
8. To remove the wobble shaft, turn the shaft so the wobble finger leans toward the motor housing. Pull out on the shaft, tilt and wiggle it to get it
to clear the crankcase.
9. To disassemble the wobble shaft, remove the retaining ring by the drive gear. Press the drive gear off, remove all remaining parts.
10. To remove the bearing housing (269), try turning it by twisting on the lugs by hand. If it can be moved, continue to twist and pull to remove. If it
will not move, it must be removed with an internal bearing puller.
11. When removing the intermediate shaft, note the number of shim washers that are between the snap ring and the bearing. Be sure
to return them all when reassembling the tool.
12. To remove the handle, push out dowel pin (7), open handle, remove snap ring and washer from anti-vibration rubber mount, disconnect field
leads under motor cover and remove handle.
13. To remove motor, remove two screws from the top of the crankcase and four screws (111) from deep pockets in motor housing (100).
Slide motor and motor housing out of crankcase.
14. To remove armature from motor assembly, pull brushes off of commutator, slide bearing cover (130) from under bearing, slide armature out.
15. When reassembling bearing housing (269) to crankcase do not press it completely into place before the piston and wobble shaft are in place.
16. Shim washers (427) as required, maximum of 2.
17. When reassembling the wobble shaft,
a clearance of .001 to .003 inch must
be maintained between the drive gear
and the inner race of the wobble plate.
The ground side of the gear must
face the wobble plate.
18. Before assembling wobble shaft to
crankcase, assemble the loose rollers
that support the drive gear end of the
wobble shaft in their shell in the crankcase.
Hold the rollers in place with grease.
(Tool may not have loose rollers)
19. When reassembling the clutch be sure
to stack the disk springs as shown.
20. Thrust bearing on spindle
must be assembled as shown.
21. To push the internal retaining ring into the spindle that retains the striker, striker support and ram catcher, use an old, used piston. The position
of the ring can be visually checked by looking in the removal ports.
22. Seal of item (413) to face bearing.
23. Check items (117 and 127), replace if worn or missing.
24. Bearing Cup (115) to be placed in motor cover (101) before assembly.
25. To assemble the Quik Change chuck ejector ring (257), assemble the inner and outer springs, the locking ring and all six balls. Enclose the
balls with your hand so they cannot fall out and press in the ejector ring with an old, used SDS-plus adapter body. While this is in place push
the plastic sleeve onto the locking ring. Pull the locking sleeve back, toward the motor to eject the adapter body.
BULLETIN 54-24-0576 Feb. 2007PAGE 2 OF 2
SEE BACK PAGE OF THIS BULLETIN
FOR ADDITIONAL LUBRICATION
AND SERVICE NOTES

Torque (in lb.) Description Thread Locking Sealant
22 Motor/armature bolts (2) None
22 Motor housing bolts (4) None
9 Cord Clamp screws (2) None
85 Anti-vibration post (1) None
10 Handle screws (3) None
16 Motor cover screws (4) None
50 Spindle retaining bolts (2) Blue
22-26 Gearcase screws (4) None
GREASING INSTRUCTIONS:
5303-20
Type "P" Grease (Cat. No. 49-08-4250)
1. Place 1/2 oz. at needle bearing / splined retainer area of gear case.
2. Grease assembled wobble shaft with 1/2 oz. of grease.
3. Place 1/8 oz. in armature pinion / intermediate shaft assembly (420) ca ity.
4. Place 1/4 oz. of grease in wobble shaft dri e gear ca ity of crankcase.
5. Grease clutch and clutch springs on spindle with 1/8 oz. of grease.
NOTE: Total amount used; 1 1/2 oz. (one complete tube)
Type "Q" Grease (Cat. No. 49-08-4255)
1. Coat the spindle inside and out.
2. Coat all parts assembled on or in spindle except for clutch.
3. Coat piston (inside and out), ram, wrist pin and wrist pin washers or sliding bow. DO NOT coat the flat face of the ram.
NOTE: Total amount used; 3/4 oz. (1/2 of a full tube)
1/8 oz. Type "P"
Coat Type "Q"
1/2 oz. Type "P"
1/4 oz. Type "P"
Coat Type "Q"
Coat Type "Q"
1/8 oz. Type "P"
1/2 oz. Type "P" at needle
bearing/splined retainer