BU 510-4 SWIVEL FOR BU 500-4-A
BU 510-5 SWIVEL BLOCK FOR 74
BU 511 SWIVEL PIN (ALL BACKUPS)
BU 512 HOUSING HEAD ONLY
BU 512-1-A HOUSING ASSY W/PIN & HANDLE
BU 512-4-A HOUSING ASSY W/PIN & HANDLE
BU 512-R REBUILT HOUSING ASSY (WHEN AVAILABLE)
BU 513-1 RETURN SPRING HOUSING
BU 514 PULL PIN
BU 515 BUSHING (3/4 X 1)
BU 517-1 CLEVIS PIN FOR 147-40
BU 518-1-A TAIL SHAFT W/PIN
BU 518-2-A TAL SHAFT W/PIN
BU 518-A TAIL SHAFT W/PIN
BU 521-100 AIR CONTROL/BACKUP TOOL
BU 521-A BACKUP AIR CYLINDER C500 TONG
BU 521-X B/U CYLINDER COUNTERWEIGHT
BU 522 BACKUP TOOL STIRRUP
BU 523 REPAIR KIT FOR BU 521-A
BU 523-1 RETAINING RING
BU 523-2 PISTON W/ROD FOR BU 521-A
BU 523-3 LOCK NUT
BU 523-4 CYLINDER END
BU 524 NUT OF BACKUP TOOL
