| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | XA2597 | CONTROL ELEMENT ASSEMBLY | | |
| 2 | XA2606 | PIN, THREADED | | |
| 3 | XA2608 | LOCKNUT, SEAL | | |
| 4 | XA2602 | SCREW, LOCKING | | |
| 5 | XA2605 | SPRING, PRESSURE | | |
| 6 | XA2609 | O-RING | | |
| 7 | XA2607 | SPRING, PRESSURE | | |
| 8 | XA2604 | BOLT, SPRING | | |
| 9 | XA2603 | PISTON, CONTROL | | |
| 10 | XA2598 | CONTROL ELEMENT ASSEMBLY (1) | | |
| 10 | XA2671 | CONTROL ELEMENT ASSEMBLY (2) | | |
| 11 | XA2606 | PIN, THREADED | | |
| 12 | XA2608 | LOCKNUT, SEAL | | |
| 13 | XA2610 | SCREW, LOCKING | | |
| 14 | XA2609 | O-RING | | |
| 15 | XA2613 | SPRING, PRESSURE | | |
| 16 | XA2612 | BOLT, SPRING | | |
| 17 | XA2605 | SPRING, PRESSURE | | |
| 18 | XA2614 | BUSHING | | |
| 19 | XA2611 | PISTON, CONTROL (1) | | |
| 19 | XA2673 | PISTON, CONTROL (2) | | |
| 20 | XA2615 | SCREW, LOCKING | | |
| 21 | XA2674 | O-RING | | |
| 22 | XA2589 | PIN, BREAK-OFF | | |
| 23 | XA2672 | ORIFICE | | |
| 24 | XA2594 | SCREW, LOCKING | | |
| 25 | XA2601 | CAPSCREW | | |
| 26 | XA2600 | PIN, BREAK-OFF | | |
| 27 | XA2599 | HOUSING | | |
| NS|30 | | NOTE: (1) INCLUDED IN PC1636 STEERING PUMP ASSEMBLY. | | |
| NS|31 | | (2) INCLUDED IN PC1637 BLOWER PUMP ASSEMBLY. | | |
| NS|32 | | (QUANTITIES SHOWN ARE FOR ONE REGULATOR ASSM ONLY.) | | |
