| Item | Part No. | Part Name | Qty | Serial No. |
| 23A-60-12600 | CONTROL VALVE ASS'Y | 4001-4500 | ||
| THE KAYABA KOGYO PART NUMBER IS THAT KB IS REMOVED FROM KOMATSU PART NUMBER LISTED BELOW. | ||||
| KB21013-33315 | SPOOL SECTION ASS'Y | 4001-4500 | ||
| KB21013-32399 | SPOOL SECTION ASS'Y | 4001-4500 | ||
| 1 | \6\ | HOUSING | 4001-4500 | |
| 2 | \6\ | O-RING (KIT) | 4001-4500 | |
| 3 | \6\ | WIPER (KIT) | 4001-4500 | |
| 4 | \6\ | SPOOL | 4001-4500 | |
| 5 | \6\ | SPOOL | 4001-4500 | |
| 6 | KB21011-30613 | SPRING | 4001-4500 | |
| 7 | KB21011-30702 | SEAT,SPRING | 4001-4500 | |
| 8 | KB21011-30507 | SCREW,CAP | 4001-4500 | |
| 9 | KB21011-31011 | CAP | 4001-4500 | |
| 10 | KB21011-31702 | PLATE,PLATE | 4001-4500 | |
| 11 | KB92702-06181 | BOLT | 4001-4500 | |
| 12 | KB21011-31507 | LINK | 4001-4500 | |
| 13 | KB21011-33307 | PIN,CLEVIS | 4001-4500 | |
| 14 | KB94311-05082 | WASHER | 4001-4500 | |
| 15 | KB93601-12082 | PIN,COTTER | 4001-4500 | |
| 16 | KB21011-31205 | BRACKET | 4001-4500 | |
| 17 | KB21011-31702 | PLATE,PLATE | 4001-4500 | |
| 18 | KB92702-06181 | BOLT | 4001-4500 | |
| 19 | KB21011-32404 | POPPET | 4001-4500 | |
| 20 | KB21011-30604 | SPRING | 4001-4500 | |
| 21 | \6\ | O-RING (KIT) | 4001-4500 | |
| 22 | KB21011-30917 | SPACER | 4001-4500 | |
| KB21013-34810 | SECTION ASS'Y,INLET | 4001-4500 | ||
| 23 | KB21011-30336 | HOUSING | 4001-4500 | |
| 24 | \6\ | O-RING (KIT) | 4001-4500 | |
| 25 | KB21013-30664 | RELIEF VALVE ASS'Y | 4001-4500 | |
| KB21013-34845 | SECTION ASS'Y,INLET | 4001-4500 | ||
| 26 | KB21011-30351 | HOUSING | 4001-4500 | |
| 27 | \6\ | O-RING (KIT) | 4001-4500 | |
| KB21003-00207 | PLUG ASS'Y | 4001-4500 | ||
| 28 | KB21001-00504 | PLUG | 4001-4500 | |
| 29 | \6\ | O-RING (KIT) | 4001-4500 | |
| KB21003-00191 | PLUG ASS'Y | 4001-4500 | ||
| 30 | KB21001-00127 | PLUG | 4001-4500 | |
| 31 | \6\ | O-RING (KIT) | 4001-4500 | |
| 32 | KB21051-30106 | STUD | 4001-4500 | |
| 33 | KB93118-08652 | NUT | 4001-4500 | |
| 34 | KB21051-30105 | STUD | 4001-4500 | |
| 35 | KB93128-10082 | NUT | 4001-4500 | |
| SERVICE KIT | ||||
| KIT | 23A-60-06220 | SERVICE KIT,CONTROL VALVE | 4001-4500 |