| Item | Part No. | Part Name | Qty | Serial No. |
| 23S-44-52120 | VALVE ASS'Y,AIR | 53001- | ||
| THE NABCO PART NUMBER IS THAT NA IS REMOVED FROM KOMATSU PART NUMBER LISTED BELOW. | ||||
| 1 | NA42411120090 | BODY | 53001- | |
| NA42412020010 | VALVE (KIT) | 53001- | ||
| 2 | NA42412120010 | CAP,VALVE | 53001- | |
| 3 | NA42412220010 | VALVE,INLET | 53001- | |
| 4 | NA42412420010 | SPRING,VALVE | 53001- | |
| 5 | NA45912420030 | GUIDE,VALVE | 53001- | |
| 6 | NA45912520030 | VALVE,EXHAUST | 53001- | |
| 7 | NA3061-0014 | O-RING (KIT) | 53001- | |
| 8 | NA42414320010 | SPRING,RETURN | 53001- | |
| NA42415020090 | PISTON | 53001- | ||
| 9 | NA42415320090 | PISTON | 53001- | |
| 10 | NA3051-1022 | O-RING (KIT) | 53001- | |
| 11 | NA3061-0010 | O-RING (KIT) | 53001- | |
| 12 | NA42416220090 | SPRING | 53001- | |
| 13 | NA42415620090 | SEAT,SPRING | 53001- | |
| 14 | NA0150-1010060 | WASHER | 53001- | |
| 15 | NA3001-0616 | BOLT | 53001- | |
| 16 | NA3026-0612 | SCREW AND WASHER | 53001- | |
| 17 | NA45433130010 | EXHAUST (KIT) | 53001- | |
| 18 | NA45433230010 | WASHER | 53001- | |
| 19 | NA3021-0005 | WASHER,SPRING | 53001- | |
| 20 | NA42217220010 | SCREW | 53001- | |
| 21 | NA42421020090 | PLATE | 53001- | |
| 22 | NA42422120010 | PLUNGER | 53001- | |
| 23 | NA42222220020 | BOOT (KIT) | 53001- | |
| 24 | NA3006-0822X | BOLT AND WASHER | 53001- | |
| SERVICE KIT | ||||
| KIT | 23S-44-52130 | REPAIR KIT,AIR VALVE | 53001- |