| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | 421-64-A1102 | STEERING UNIT - ORBITROL VALVE BODY | | A51001-UP- |
| 2 | 421-64-A1161 | CAPSCREW | | A51001-UP- |
| 3 | 421-64-A1230 | END CAP | | A51001-UP- |
| 4 | 421-64-A1140 | GERATOR | | A51001-UP- |
| 5 | 421-64-A1150 | SPACER | | A51001-UP- |
| 6 | 421-64-A1240 | SPACER PLATE | | A51001-UP- |
| 7 | 421-64-A1130 | CENTERING SPRING KIT | | A51001-UP- |
| 8 | 421-64-A1120 | BUSHING, SEAL GLAND | | A51001-UP- |
| 9 | (NSS) | SEAL | | A51001-UP- |
| 10 | (NSS) | RING | | A51001-UP- |
| 11 | (NSS) | O-RING | | A51001-UP- |
| 12 | (NSS) | SEAL | | A51001-UP- |
| 13 | (NSS) | RACE, BEARING | | A51001-UP- |
| 14 | (NSS) | BEARING ASSEMBLY, NEEDLE | | A51001-UP- |
| 15 | (NSS) | CONTROL ASSEMBLY | | A51001-UP- |
| 16 | (NSS) | PIN | | A51001-UP- |
| 17 | (NSS) | RETAINER | | A51001-UP- |
| 18 | (NSS) | BALL | | A51001-UP- |
| 19 | (NSS) | O-RING | | A51001-UP- |
| 20 | (NSS) | SEAT, CHECK | | A51001-UP- |
| 21 | (NSS) | O-RING | | A51001-UP- |
| 22 | (NSS) | SCREW, SET | | A51001-UP- |
| 23 | (NSS) | O-RING | | A51001-UP- |
| 24 | (NSS) | DRIVE | | A51001-UP- |
| 25 | (NSS) | O-RING | | A51001-UP- |
| | | | |
| 421-64-A1250 | SERVICE KIT, STEERING VALVE | | A51001-UP- |
| | | | |
| | F1 - INCLUDED IN STEERING VALVE SERVICE KIT. | | |
| | | | |
