| Item | Part No. | Part Name | Qty | Serial No. |
| 20U-70-00122 | BOOM ASS'Y,1ST | 1394- | ||
| 20U-70-00121 | BOOM ASS'Y,1ST | 1001-1393 | ||
| 1 | \6\ | BOOM,1ST | 1394- | |
| \6\ | BOOM,1ST | 1001-1393 | ||
| 2 | 20T-70-81140 | BUSHING | 1001- | |
| 3 | 07020-00675 | FITTING,GREASE | 1001- | |
| 4 | 09453-00002 | STOPPER | 1001- | |
| 5 | 01580-11210 | NUT | 1001- | |
| 6 | 20U-70-21720 | COVER | 1001- | |
| 7 | 01011-81010 | BOLT | 1001- | |
| 8 | 01010-81090 | BOLT | 1001- | |
| 9 | 01643-31032 | WASHER | 1001- | |
| 10 | 07145-00050 | SEAL,DUST | 1001- | |
| 20U-70-00221 | BOOM ASS'Y,2ND | 1001- | ||
| 11 | \6\ | BOOM,2ND | 1001- | |
| 12 | 20U-70-21491 | BUSHING | 1001- | |
| 13 | 07020-00000 | FITTING,GREASE | 1001- | |
| 14 | 07145-00070 | SEAL,DUST | 1001- | |
| 15 | 20U-70-21712 | BRACKET,3RD | 1001- | |
| 16 | 07020-00000 | FITTING,GREASE | 1001- | |
| 20U-70-00321 | LINK ASS'Y,SUB | 1001- | ||
| 17 | \6\ | LINK,SUB | 1420- | |
| \6\ | LINK,SUB | 1001-1419 | ||
| 18 | 21W-70-31130 | BUSHING | 1001- | |
| 19 | 07145-00050 | SEAL,DUST | 1001- | |
| 20 | 07020-00900 | FITTING,GREASE | 1001- | |
| 21 | 07049-01012 | PLUG | 1001- | |
| 22 | (20U-63-X2314) | ARM CYLINDER GROUP | 1001- | |
| 23 | (20U-63-X2231) | OFFSET CYLINDER G. | 1001- |