Here are the diagrams and repair parts for Official Milwaukee 0512-21 14.4-v 1/2" power plus drill/driver, as well as links to manuals and error code tables, if available.

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#4
14.4 volt 1/2" power plug driver-drill diagram
Service nameplate
Part #12-20-0860
The manufacturer no longer makes this part, and there's no substitute part
#6
14.4 volt 1/2" power plug driver-drill diagram
Shield
Part #45-22-0145
The manufacturer no longer makes this part, and there's no substitute part
#100
14.4 volt 1/2" power plug driver-drill diagram
Motor
Part #23-30-0115
The manufacturer no longer makes this part, and there's no substitute part
#138
14.4 volt 1/2" power plug driver-drill diagram
Lead wire assembly
Part #23-94-9010
The manufacturer no longer makes this part, and there's no substitute part
#103
14.4 volt 1/2" power plug driver-drill diagram
Rubber sleeve
Part #45-22-0570
The manufacturer no longer makes this part, and there's no substitute part
#1100
14.4 volt 1/2" power plug driver-drill diagram
Housing ay
Part #31-50-0495
The manufacturer no longer makes this part, and there's no substitute part
#1
14.4 volt 1/2" power plug driver-drill diagram
Warning label
Part #10-15-0450
The manufacturer no longer makes this part, and there's no substitute part
#104
14.4 volt 1/2" power plug driver-drill diagram
O-ring
Part #34-40-2005
The manufacturer no longer makes this part, and there's no substitute part
#135
14.4 volt 1/2" power plug driver-drill diagram
Switch
Part #23-66-1295
The manufacturer no longer makes this part, and there's no substitute part
1-1/4 oz. type "g" grease no. 49-08-4140, in grease cavity. 1-1/2 oz. type 'b" grease, no. 49-08-0600, to build up wall of grease around grease cavity.
Part #N/P
The manufacturer no longer makes this part, and there's no substitute part