| Item | Part No. | Part Name | Qty | Serial No. |
| 423-64-15401 | VALVE ASS'Y,STEERING DEMAND | 20001- | ||
| 1 | \6\ | HOUSING,VALVE | 20001- | |
| 2 | \6\ | SPOOL | 20001- | |
| 3 | 421-64-15710 | POPPET | 20001- | |
| 4 | 421-64-15340 | SPRING | 20001- | |
| 5 | 421-64-15730 | SCREW,CAP | 20001- | |
| 6 | 421-64-15780 | O-RING (K17) | 20001- | |
| 7 | 421-64-15830 | PISTON | 20001- | |
| 8 | 421-64-15840 | SPRING | 20001- | |
| 9 | 421-64-15740 | SEAT,SEAT | 20001- | |
| 10 | 421-64-15750 | SPRING | 20001- | |
| 11 | 421-64-15760 | CAP | 20001- | |
| 12 | 421-64-15790 | O-RING (K17) | 20001- | |
| 13 | 421-64-15870 | O-RING (K17) | 20001- | |
| 14 | 421-64-15420 | BOLT,SOCKET HEAD | 20001- | |
| 15 | \6\ | SPOOL | 20001- | |
| 16 | 421-64-15320 | SHIM | 20001- | |
| 17 | 421-64-15490 | SPRING | 20001- | |
| 18 | 421-64-15440 | PLUG | 20001- | |
| 19 | 421-64-15470 | O-RING (K17) | 20001- | |
| 20 | 421-64-15480 | RING,BACK-UP (K17) | 20001- | |
| 21 | 421-64-15450 | PLUG | 20001- | |
| 22 | 421-64-15460 | O-RING (K17) | 20001- | |
| 23 | 421-64-15880 | VALVE ASS'Y,RELIEF | 20001- | |
| 24 | 421-64-15720 | PLUG | 20001- | |
| 25 | 421-64-15330 | POPPET | 20001- | |
| 26 | 421-64-15860 | SPRING | 20001- | |
| 27 | 421-64-15310 | PLUG | 20001- | |
| 28 | 421-64-15850 | O-RING (K17) | 20001- | |
| 29 | 421-64-15810 | PLUG | 20001- | |
| 30 | 421-64-15820 | O-RING (K17) | 20001- | |
| 31 | 421-64-15890 | VALVE ASS'Y,RELIEF | 20001- |