| Item | Part No. | Part Name | Qty | Serial No. |
| 423-57-A1100 | SEAT ASSEMBLY, OPERATOR'S | | |
| 1 | 01640-21123 | WASHER | | |
| 2 | 01643-31032 | WASHER | | |
| 3 | 02010-20625 | BOLT | | |
| 4 | 02011-20502 | BOLT | | |
| 5 | 423-57-A1290 | SPACER | | |
| 6 | 423-57-A1370 | WASHER, RECTANGULAR | | |
| 7 | 423-57-A1380 | WASHER, RUBBER | | |
| 8 | 423-57-A1390 | CABLE | | |
| 9 | 423-57-A1410 | BELT, SEAT | | |
| 10 | 423-57-A1420 | NUT, PUSH-ON | | |
| 11 | 423-57-A1440 | BRACKET, L.H | | |
| N/I | 423-57-A1450 | BRACKET, R.H | | |
| 12 | 423-57-A1460 | NUT, CENTERLOCK - 3/8 UNC | | |
| 13 | 423-57-A1470 | NUT, CENTERLOCK - 7/16 UNC | | |
| 14 | 423-57-A1480 | SPACER | | |
| 15 | 423-57-A1510 | KNOB, BACK REST TILT | | |
| 16 | 423-57-A1520 | KNOB, SEAT TILT | | |
| 17 | 423-57-A1530 | PIN, SPIRAL | | |
| 18 | 423-57-A1110 | SEAT ASSEMBLY | | |
| 423-57-A1360 | COVER, SEAT BACK CUSHION | | |
| 423-57-A1430 | FASTENER, COVER | | |
| 19 | | SUSPENSION ASSEMBLY (SEE PG 05-054) | | |
| | | | |
| | F1 - USED ON MACHINES WITH S/N A25025 AND BELOW. WHOLE SEAT ASSEMBLY | | |
| | AND SUSPENSION MUST BE REPLACED IF CONVERTING TO KOMATSU SEAT | | |
| | P/N 423-57-11104. | | |
