TM 9-2320-361-34 I 15-9. TANK BODIES FRAME SILL MAINTENANCE (Contd) b. Inspection c. Installation 4. Remove two locknuts (2), washers (3), screws (4), and frame sill (5) from tank body (1). Discard locknuts (2). 5. Remove locknut (11), washer (12), and screw (13) from bracket (14) and frame sill (10). Discard locknut (11). 6. Remove locknut (7), washer (8), screw (9), and frame sill (10) from tank body (6). Discard lock- nut (7). Inspect each frame sill (19), (5), or (10) for end splits or rotting. Replace if end split exceeds width of frame sill (19), (5), or (10) or frame sill (19), (5), or (10) is damaged. NOTE ● Perform steps 1 through 3 for M50A2 sill installation. . Perform step 4 for M49A2C sill installation. . Perform steps 5 and 6 for M50A3 sill installation. . Assistant will help with installation of frame sill. 1. Install frame sill (19) on tank body (15) with screw (18), washer (17), and new locknut (16). 2. Install bracket (22) on frame sill (19) with screw (24), washer (21), and new locknut (20). Do not tighten locknut (20). 3. Install bracket (22) on bracket (25) with screw (26) and new locknut (23). Tighten locknut (20). 4. Install frame sill (5) on tank body (1) with two screws (4), washers (3), and new locknuts (2). 5. Install frame sill (10) end on tank body (6) with screw (9), washer (8), and new locknut (7). 6. Install frame sill (10) end on tank body (6) and bracket (14) with screw (13), washer (12), and new locknut (11). 15-34