| Item | Part No. | Part Name | Qty | Serial No. |
| 421-35-11400 | VALVE ASS'Y,TREADLE | 4501- | ||
| 1 | \6\ | BODY,UPPER | 4501- | |
| 566-35-00130 | VALVE ASS'Y,UPPER | 4501- | ||
| 2 | \6\ | VALVE,UPPER (KIT A) | 4501- | |
| 3 | \6\ | RETAINER | 4501- | |
| 4 | \6\ | SPRING (KIT B) | 4501- | |
| 5 | \6\ | RETAINER | 4501- | |
| 6 | \6\ | O-RING (KIT A) | 4501- | |
| 7 | \6\ | WASHER,SPECIAL | 4501- | |
| 8 | \6\ | RING,RETAINER (KIT A) | 4501- | |
| 9 | \6\ | O-RING (KIT A) | 4501- | |
| 10 | \6\ | RING,RETAINER (KIT A) | 4501- | |
| 11 | \6\ | SPRING (KIT B) | 4501- | |
| 12 | 238-44-12230 | PISTON,RELAY | 4501- | |
| 13 | \6\ | O-RING (KIT A) | 4501- | |
| 14 | \6\ | O-RING (KIT A) | 4501- | |
| 15 | \6\ | SPRING,RETURN (KIT B) | 4501- | |
| 566-35-00140 | STEM ASS'Y | 4501- | ||
| 16 | \6\ | STEM | 4501- | |
| 17 | \6\ | SPRING,INNER (KIT B) | 4501- | |
| 18 | \6\ | SPRING,OUTER (KIT B) | 4501- | |
| 19 | \6\ | SLEEVE | 4501- | |
| 20 | \6\ | WASHER | 4501- | |
| 21 | 238-44-12330 | PISTON,UPPER | 4501- | |
| 22 | \6\ | SPRING,RUBBER (KIT A) | 4501- | |
| 23 | 238-44-12350 | SEAT,SPRING | 4501- | |
| 24 | 01580-10605 | NUT | 4501- | |
| 25 | 01602-20619 | WASHER,SPRING | 4501- | |
| 26 | 01643-30623 | WASHER | 4501- | |
| 27 | \6\ | O-RING (KIT A) | 4501- | |
| 28 | \6\ | BODY,LOWER | 4501- | |
| 421-35-15990 | VALVE ASS'Y,LOWER | 4501- | ||
| 29 | \6\ | VALVE,LOWER (KIT A) | 4501- | |
| 30 | \6\ | RETAINER | 4501- | |
| 31 | \6\ | SPRING (KIT B) | 4501- | |
| 32 | \6\ | RETAINER | 4501- | |
| 33 | \6\ | O-RING (KIT A) | 4501- | |
| 34 | \6\ | WASHER,SPECIAL | 4501- | |
| 35 | \6\ | RING,RETAINER (KIT A) | 4501- | |
| 36 | \6\ | O-RING (KIT A) | 4501- | |
| 37 | 238-44-12470 | COVER,EXHAUST | 4501- | |
| 38 | \6\ | VALVE,EXHAUST (KIT A) | 4501- | |
| 39 | 01220-40510 | SCREW | 4501- | |
| 40 | 01601-20513 | WASHER,SPRING | 4501- | |
| 41 | \6\ | O-RING (KIT A) | 4501- | |
| 42 | 01010-50620 | BOLT | 4501- | |
| 43 | 01602-20619 | WASHER,SPRING | 4501- | |
| 44 | 421-35-15190 | PLATE ASS'Y | 4501- | |
| 45 | 421-35-15270 | PLUNGER | 4501- | |
| 46 | 238-44-12530 | BOOT | 4501- | |
| 47 | 421-35-15290 | TREADLE | 4501- | |
| 48 | 238-44-12550 | BOOT | 4501- | |
| 49 | 238-44-12590 | PIPE | 4501- | |
| 50 | 238-44-12560 | PIN | 4501- | |
| 51 | 238-44-12570 | PIN | 4501- | |
| 52 | 238-44-12580 | ROLLER | 4501- | |
| 53 | 238-44-12610 | PIN,COTTER | 4501- | |
| 54 | 01252-30820 | BOLT | 4501- | |
| 55 | 01580-10806 | NUT | 4501- | |
| 56 | 01010-50825 | BOLT | 4501- | |
| 57 | 01602-20825 | WASHER,SPRING | 4501- | |
| SERVICE KIT | ||||
| KIT A | 238-44-05030 | SERVICE KIT,SEAL | 4501- | |
| KIT B | 421-35-05110 | SPRING KIT,SPRING | 4501- |