TM  10-3930-669-20 16-6.  TOP WINDSHIELD WIPER ARM REPLACEMENT. This task covers: a.   Removal b.   Installation INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive (Item 1, Appendix B) Materials/Parts Nut, Lock Washer, Lock Equipment Condition Engine OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) a.  Removal. WARNING Wiper arm is spring loaded and could cause injury during removal. (1)   Remove nut (1) and wiper arm assembly (2) from drive shaft (3). 16-17