| Item | Part No. | Part Name | Qty | Serial No. |
| 1 | 20Y-70-K4521 | ARM | 40399- | |
| 20Y-70-K4520 | ARM | 40001-40398 | ||
| 2 | 20Y-70-32E50 | SEAT (WELDED) | 40001- | |
| 3 | 20Y-970-3570 | BRACKET (WELDED) | 40001- | |
| 4 | 20J-70-12180 | SEAT (WELDED) | 40001- | |
| 5 | 20Y-62-K5630 | SEAT (WELDED) | 40001- | |
| 6 | 20Y-70-31272 | BUSHING | 40001- | |
| 7 | 20Y-70-32410 | BUSHING | 40001- | |
| 8 | 205-70-73180 | BUSHING | 40001- | |
| 9 | 07020-00000 | FITTING,GREASE | 40001- | |
| 10 | 07145-00090 | SEAL | 40001- | |
| 11 | 20Y-70-23220 | SEAL | 40001- | |
| 12 | 20Y-70-23230 | SEAL | 40001- | |
| 13 | 20Y-70-31160 | PIN | 40001- | |
| 14 | 205-70-66580 | PLATE | 40001- | |
| 15 | 01010-81230 | BOLT | 40001- | |
| 16 | 01643-31232 | WASHER | 40001- | |
| 17 | 20Y-70-31431 | SPACER¤ 1.0MM | 40001- | |
| 18 | 205-70-71190 | PIN | 40001- | |
| 19 | 205-70-66580 | PLATE | 40001- | |
| 20 | 01010-81230 | BOLT | 40001- | |
| 21 | 01643-31232 | WASHER | 40001- | |
| 22 | 20Y-70-31381 | SPACER¤ 1.0MM | 40001- | |
| 23 | 20Y-70-31391 | SPACER¤ 2.0MM | 40001- | |
| 24 | (707-01-XR270) | CYLINDER GROUP,(SEE FIG. Y1620-41A1) | 40001- |