FORWARD HANGER BEARING COUPLING REMOVAL/INSTALLATION

TM 1-1520-238-23 Change 4 6-31 6.6. FORWARD HANGER BEARING COUPLING REMOVAL/INSTALLATION – continued CAUTION When installing forward hanger bearing coupling, ensure that bolts are installed through 0.250 INCH bolt holes on cou- pling aft flange. Do not install bolts through any of 0.500 INCH lightening holes. Installation of bolts through lighten- ing holes will result in failure of drive shaft and/or coupling. b. Install coupling (1). Torque bolts (2) and (5) to 125 INCH-POUNDS. (1) Position coupling (1) between flange (7) and shaft (4) with nutplates (14) facing forward. Aline bolt holes. (2) Install five bolts (5) through flange (7) and coupling (1) forward flange (6). (3) Install five bolts (2) through coupling (1) aft flange (3) and shaft (4). (4) Torque bolts (2) and (5) to 125 INCH- POUNDS. Use torque wrench adapter and torque wrench. (5) Apply corrosion preventive compound to bolts (2) and (5). Use corrosion preventive compound (item 62A, App F). c. Inspect (QA). d. Secure forward catwalk (para 2.84). e. Secure access doors T250L, T250R, T290L, T290R, and L325 (para 2.2). f. Perform drive system vibration maintenance operational check (TM 1-1520-238-T). END OF TASK 5 7 2 1 4 M04-0439-3 14 6 3