ARMY TM 5-5420-212-10-1
MARINE CORPS TM 08676A-10/1-1
Inspect nut and bolt for damage to threads.
Remove burrs from captive pin (7) with flat file.
Replace components as necessary.
Open prongs of cotter pin (6), slide chain link (4) through prongs, then close prongs.
Insert cotter pin (6) through hole in captive pin (7) until fully seated, then bend prongs around captive pin.
Secure chain to cross girder with bolt (2), new locknut (1), and washer (3).