| Item | Part No. | Part Name | Qty | Serial No. |
| 23D-60-12301 | CONTROL VALVE ASS'Y | 4028-4500 | ||
| THE KAYABA KOGYO PART NUMBER IS THAT KB IS REMOVED FROM KOMATSU PART NUMBER LISTED BELOW. | ||||
| KB21013-21426 | SPOOL SECTION ASS'Y | 4001-4500 | ||
| KB21013-21462 | SPOOL SECTION ASS'Y,BLADE LIFT | 4028-4500 | ||
| 1 | \6\ | HOUSING | 4001-4500 | |
| 2 | \6\ | HOUSING,BLADE LIFT | 4001-4500 | |
| 3 | \6\ | O-RING (K15) | 4001-4500 | |
| 4 | \6\ | WIPER (K15) | 4001-4500 | |
| 5 | \6\ | SPOOL | 4001-4500 | |
| 6 | KB21011-22457 | SPRING | 4001-4500 | |
| 7 | KB21011-21251 | SEAT | 4001-4500 | |
| 8 | KB21011-22351 | SCREW | 4001-4500 | |
| 9 | KB21011-21851 | CAP | 4001-4500 | |
| 10 | KB21011-21152 | SEAL,PLATE | 4001-4500 | |
| 11 | KB92702-05121 | BOLT | 4001-4500 | |
| 12 | KB21011-22251 | HEAD,SPOOL | 4001-4500 | |
| 13 | KB21011-31507 | LINK | 4001-4500 | |
| 14 | KB21011-33307 | PIN | 4001-4500 | |
| 15 | KB94311-05082 | WASHER | 4001-4500 | |
| 16 | KB93601-12082 | PIN,COTTER | 4001-4500 | |
| 17 | KB21011-21951 | BRACKET | 4001-4500 | |
| 18 | 23D-60-12121 | BRACKET,BLADE LIFT | 4028-4500 | |
| 19 | KB21011-21152 | SEAL,PLATE | 4001-4500 | |
| 20 | KB92702-05121 | BOLT | 4001-4500 | |
| 21 | KB21011-21052 | VALVE | 4001-4500 | |
| 22 | KB21011-22452 | SPRING | 4001-4500 | |
| 23 | \6\ | O-RING (K15) | 4001-4500 | |
| 24 | KB21013-20931 | VALVE ASS'Y | 4028-4500 | |
| 25 | KB21013-20932 | VALVE ASS'Y | 4028-4500 | |
| KB21013-20169 | INLET SECTION ASS'Y | 4001-4500 | ||
| 26 | KB21011-20163 | HOUSING | 4001-4500 | |
| 27 | \6\ | O-RING | 4001-4500 | |
| KB21003-00207 | PLUG ASS'Y | 4001-4500 | ||
| 28 | KB21001-00504 | PLUG | 4001-4500 | |
| 29 | \6\ | O-RING | 4001-4500 | |
| 30 | KB21013-30664 | RELIEF VALVE ASS'Y,RELIFE | 4001-4500 | |
| 31 | KB21011-20361 | OUTLET SECTION | 4001-4500 | |
| 32 | KB21031-30104 | STUD | 4001-4500 | |
| 33 | KB93328-08652 | NUT | 4001-4500 |