5-35. UNDERFRAME RETRACTABLE MECHANISM MAINTENANCE (M313).
This Task Covers:
Body Frame Beam and Guide Rollers Removal
Sprocket Assembly Installation
Sprocket Assembly Removal
Body Frame Beam and Guide Rollers Installation
Cleaning and Inspection
l Semitrailer parked on flat level surface with wheels
l Grease (Item 7, Appendix E)
l Dry cleaning solvent (Item 14, Appendix E)
l One self-locking nut
l General mechanics tool kit
l Forty cotter pins
BODY FRAME BEAM AND GUIDE ROLLERS REMOVAL I
Expand both side walls of semitrailer about 12 inches (30.48 cm) (para 2-13).
Remove 64 screws (20) and ten outer access covers (19, 23, and 24) from under semitrailer frame (1).
Remove 20 cotter pins (6) from ten beam shafts (7). Discard cotter pins.
Remove ten beam shafts (7) and beam rollers (14) from retractable beams (2).
Remove 20 cotter pins (3) from ten guide roller shafts (4). Discard cotter pins.
Remove ten guide roller shafts (4) and body frame guide rollers (5) from retractable beams (2).
b. SPROCKET ASSEMBLY REMOVAL I
Use this task to remove the left or right side sprocket assembly. Right sprocket
assembly is shown.
Remove self-locking nut (10) from lock assembly (9) and rear mechanism box.
Disengage and remove lock assembly (9) from ratchet pawl (8).
Remove 30 screws (21) and five inner access covers (22 and 25) from semitrailer frame (1).
Loosen five setscrews (11) securing shaft collars (13) to ratchet drive shaft (12).
As ratchet drive shaft is removed, note order and position of collars, spacers, sprocket
assemblies and bushings to ensure proper installation.
Remove ratchet drive shaft (12) by sliding shaft towards rear of the semitrailer frame(l). As the front end of the
ratchet drive shaft passes through each of the five mechanism boxes and four crossmembers, remove shaft
collars (13) with setscrews (11), sleeve spacers (15 and 17), sprocket assembly (16), and sleeve bushings (18).