| Item | Part No. | Part Name | Qty | Serial No. |
| (723-48-20102) | VALVE ASS'Y | 21290- | ||
| (723-48-20101) | VALVE ASS'Y | 20805-21289 | ||
| (723-48-20100) | VALVE ASS'Y | 20001-20804 | ||
| THESE ASSEMBLIES CONSIST OF ALL PARTS SHOWN IN FIGS.Y1664-01A0 TO Y1664-21A0. | ||||
| 723-46-17701 | PLUG ASS'Y | 20001- | ||
| 1 | 723-46-17711 | PLUG | 20001- | |
| 2 | 07000-11009 | O-RING | 20001- | |
| 3 | 07001-01009 | RING,BACK-UP | 20001- | |
| 4 | 07000-11007 | O-RING | 20001- | |
| 5 | 07001-01007 | RING,BACK-UP | 20001- | |
| 723-40-91500 | VALVE ASS'Y,RELIEF | 20001- | ||
| 6 | \6\ | SLEEVE | 20001- | |
| 7 | 700-80-64220 | RING | 20001- | |
| 8 | 700-22-11410 | O-RING | 20001- | |
| 9 | \6\ | SEAL | 20001- | |
| 10 | \6\ | POPPET | 20001- | |
| 11 | \6\ | PISTON | 20001- | |
| 12 | \6\ | SEAT | 20001- | |
| 13 | \6\ | SPRING | 20001- | |
| 14 | \6\ | SEAL | 20001- | |
| 15 | 709-25-11390 | O-RING | 20001- | |
| 16 | \6\ | POPPET | 20001- | |
| 17 | \6\ | O-RING | 20001- | |
| 18 | \6\ | PLUG | 20001- | |
| 19 | \6\ | NUT | 20001- | |
| 20 | \6\ | SPRING | 20001- | |
| 21 | \6\ | O-RING | 20001- | |
| 22 | \6\ | SPACER | 20001- | |
| 23 | \6\ | NUT | 20001- |