TM 10-3930-659-20 16-7. REAR WINDOW WIPER ARM AND BLADE MAINTENANCE (Con't). 2. Remove retainer (10) and plate (9) from cab (8). 3. Remove two nuts (11 and 12), lockwasher (13), and window wiper arm (4) from cab (8).   Discard lockwasher. 4. Remove nut (21), cap (20), nut (19), washer (18), and gasket (17) from pivot assembly (16).  Discard gasket. 5. Remove two screws (22), plate (23), and gasket (24) from cab (8). 6. Remove two screws (14), washers (15), and pivot assembly (16) from cab (8). 7. Remove nut (25) and crankpin (26) from pivot assembly (16). TA706986 16-24