| Item | Part No. | Part Name | Qty | Serial No. |
| (1281 177 H91) | UNDERCARRIAGE | | |
| (1281 178 H91) | TRACK FRAME | | |
| 1280 537 H91 | FRAME ASSY, LEFT TRACK | | |
| 1280 538 H91 | FRAME ASSY, RIGHT TRACK | | |
| 1 | (NSS) | FRAME, TRACK | | |
| 2 | 621 338 C1 | BAR, FRONT IDLER WEAR | | |
| 2 | 662 526 C1 | BAR, FRONT IDLER WEAR | | |
| 3 | 1233 532 H1 | BLOCK, TOP IDLER MOUNTING | | |
| (1261 941 H91) | STABILIZING LINKAGE | | |
| 4 | 338 159 R1 | RING, RETAINING | | |
| 5 | 1283 831 H1 | RETAINER, RING | | |
| 6 | 743 286 C1 | BAR, REAR RIGID | | |
| 7 | 621 410 C1 | BAR, LOCK | | |
| 24 875 R1 | BOLT, HEX - 5/8NCx2 | | |
| 25 537 R1 | WASHER, FLAT - 5/8 | | |
| 8 | 621 411 C1 | SHIM, LOCK BAR | | |
| 9 | 1306 387 H1 | SHIM, LOCK BAR | | |
| 10 | 621 560 C1 | PIN, MOUNTING | | |
| 11 | 1252 418 H91 | CROSSBAR, FRONT | | |
| 24 895 R1 | BOLT, HEX - 3/4NCx4-1/2 | | |
| 25 548 R1 | WASHER, FLAT - 3/4 | | |
| (1251 269 H91) | TRACK ROLLERS AND IDLERS | | |
| 12 | | ROLLER, TRACK (SEE PG 14-008) | | |
| 24 880 R1 | BOLT, HEX - 5/8NCx3-1/2 | | |
| 25 537 R1 | WASHER, FLAT - 5/8 | | |
| 13 | | IDLER, TOP (SEE PG 14-006) | | |
| 24 878 R1 | BOLT, HEX - 5/8NCx2-3/4 | | |
| 25 537 R1 | WASHER, FLAT - 5/8 | | |
| (1281 179 H91) | FRONT IDLER AND ADJUSTER | | |
| 14 | | IDLER, FRONT (SEE PG 14-010) | | |
| 15 | 622 044 C1 | BAR, WEAR | | |
| 870 325 R1 | BOLT, HEX - 7/16NCx1-3/8 | | |
| 115 314 | WASHER, LOCK - 7/16 | | |
| 16 | 621 423 C1 | SHIM, WEAR BAR | | |
| 17 | 1280 497 H1 | PLATE, THRUST | | |
| 24 875 R1 | BOLT, HEX - 5/8NCx2 | | |
| 18 | 1280 498 H1 | SHIM, THRUST PLATE | | |
| 19 | | SPRING, TRACK (SEE PG 14-012) | | |
| 20 | | ADJUSTER, TRACK (SEE PG 14-012) | | |
| 21 | | FINAL DRIVE AND SPROCKET (SEE PG 07-082) | | |
| (1285 338 H91) | COUNTERWEIGHT | | |
| 22 | 1285 310 H1 | COUNTERWEIGHT, FRONT IDLER | | |
| 24 868 R1 | BOLT, HEX - 1/2NCx4 | | |
| 25 555 R1 | WASHER, FLAT - 1/2 | | |
| 9412 230 | NUT, LOCK - 1/2NC | | |
| 23 | | BAR, RUB (SEE PG 15-006) | | |
| 24 | | STEP, FOOT (SEE PG 15-006) | | |
| (1301 227 H91) | TRACK FRAME COVERS | | |
| 25 | 1301 187 H91 | COVER, FRONT | | |
| 24 860 R1 | BOLT, HEX - 1/2NCx1 | | |
| 25 536 R1 | WASHER, FLAT - 1/2 | | |
| 26 | 1301 182 H91 | COVER, REAR | | |
| 24 860 R1 | BOLT, HEX - 1/2NCx1 | | |
| 25 536 R1 | WASHER, FLAT - 1/2 | | |
| 27 | | TRACK ROLLER SHIELD (SEE PG 14-014) | | |
| | | | |
| | F1 - PART NUMBER IS A NON-SERVICE PART AND IS LISTED FOR REFERENCE ONLY. | | |
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