- Wheel Tractor-Scraper:
- 621H (S/N: DBK1-UP; HKK1-UP; NYY1-UP; EAZ1-UP)
- 623H (S/N: EJD1-UP; DBF1-UP)
- 627H (S/N: LCT1-UP; DBW1-UP)
Description of Change: The cushion hitch return lines for the machines listed above has been updated. The new lines routing provide improved service life of the hose assembly and tube assembly.
Adaptable To:
| New Parts List | |||
| Item | Qty | Part Number | Description |
| 1 | 1 | 440-6876 | Tube As |
| 2 | 1 | 1P-3703 | Rectangular Seal |
| 3 | 1 | 441-3488 | Hose As |
| 4 | 2 | 5K-9090 | O-Ring Seal |
| 5 | 1 | 8T-4139 | Bolt |
| 6 | 1 | 8T-4223 | Hard Washer |
| 7 | 1 | 1F-1609 | Spacer |
| 8 | 1 | 8T-4648 | Bolt |
| 9 | 1 | 8T-4223 | Hard Washer |
| 10 | 2 | 3S-2093 | Cable Strap |
| - | 1 | 3J-1907 | O-Ring Seal |
 | |
| Illustration 1 | g03456852 |
 | |
| Illustration 2 | g03456853 |
View of area A | |
New tube assembly (1) replaces the former 346-5534 Tube As in the 310-5530 Cushion-Hitch Lines Gp. Use rectangular seal (2) to attach top end of the new tube assembly (1) to the cushion hitch valve with existing bolts and washers.
Reuse the same mounting hardware from the former tube assembly. After replacing the new tube assembly (1), a new 3J-1907 O-Ring Seal may be needed to reinstall the existing 346-6320 Hose As to the port on the side of the new tube assembly.
New hose assembly (3) replaces the former 346-6228 Hose As in the 310-5530 Cushion-Hitch Lines Gp. Use O-ring seal (4) to attach new hose assembly (3) to the elbow on the return manifold block.
 | |
| Illustration 3 | g03470276 |
View of area B (D) 276-3469 Plate | |
Use 276-3469 Plate (D), grommet, clip halves that were securing the former tube assembly to mount the lower part of the new tube assembly (1) along with new bolt (5) and hard washer (6). Refer to Illustration 3 for proper orientation of mounting hardware.
 | |
| Illustration 4 | g03470296 |
View of area C | |
Install spacer (7) to the threaded hole where the 276-3469 Plate (D) was previously mounted. Hold the grease lines to the spacer using bolt (8), hard washer (9) and a cable strap (10). A cable strap (10) will be needed to reattach the grease lines further up on the new tube assembly (1) to the existing dual strap swivel mount.
The updated 310-5530 Cushion-Hitch Lines Gp is adaptable to machines and effective in production with machines that are listed in Table 2.
| Sales Model | Adaptable to Machines | Effective with Machines |
| 621H | S/N:DBK1-127 | S/N:DBK128-UP |
| S/N:EAZ1-125 | S/N:EAZ126-UP | |
| S/N:HKK1-131 | S/N:HKK132-UP | |
| S/N:NYY1-123 | S/N:NYY124-UP | |
| 623H | S/N:DBF1-170 | S/N:DBF171-UP |
| S/N:EJD1-106 | S/N:EJD107-UP | |
| 627H | S/N:DBW1-330 | S/N:DBW331-UP |
| S/N:LCT1-111 | S/N:LCT112-UP |