- Landfill Compactor:
- 836H (S/N: BXD1-UP; XTR1-UP)
- Excavator:
- 385C (S/N: EDA1-UP; KGB1-UP; SBE1-UP; T2E1-UP; KKK1-UP; EAM1-UP; JCM1-UP; WAW1-UP)
- Motor Grader:
- 24M (S/N: B9K1-UP)
- Mobile Hydraulic Power Unit:
- 385C MHPU (S/N: MSF1-UP)
- Off-Highway Truck/Tractor:
- 772 (S/N: RLB1-UP)
- Track-Type Tractor:
- D9T (S/N: TWG1-UP; RJS1-UP)
- Underground Articulated Truck:
- AD45B (S/N: CXM1-UP)
- Wheel Dozer:
- 834H (S/N: BTX1-UP)
- Wheel Loader:
- 988H (S/N: BXY1-UP)
- Wheel Tractor-Scraper:
- 631ESeries II (S/N: 1AB1-1445,1446-UP; 1NB1-UP; 3ND1-UP)
- 390D (S/N: WAG1-UP; BYP1-UP; WAP1-UP; WBT1-UP; KCZ1-UP)
- AD55 (S/N: DNW1-UP)
- 631G (S/N: DFA1-UP; DEM1-UP)
- 633ESeries II (S/N: 2PS1-UP)
- 637ESeries II (S/N: 1FB1-531,532-UP)
- 637E (S/N: 1JB1-UP)
- 637G (S/N: DFJ1-UP; DEX1-UP)
- 657E (S/N: 5YR1-UP; 6TR1-UP; 90Z1-UP; 91Z1-UP)
- 657G (S/N: W1B1-UP; W1C1-UP; W1E1-UP; A4G1-UP)
ReferenceDisassembly and Assembly, "Pistons and Connecting Rods - Install"
The new 20R-0629 Cylinder Pack As and 20R-0631 Cylinder Pack As are composed of a single piece steel piston with a lower ring land support.
Note: Due to a difference in the weight of the new pistons and existing pistons, the new piston must not be matched with the existing pistons. All the pistons must be replaced in an engine as a set.
The new 20R-0629 Cylinder Pack As is adaptable back to first production on the serial numbers that are listed above. Refer to Table 1 for information on the new cylinder pack assemblies and the parts that are replaced.
| 20R-0629 Cylinder Pack As (18:1 Compression Ratio) | ||
| New Part Number Included | Existing Part Number | Part Description |
| 20R-0629 | 10R-8760 | Cylinder pack |
| 368-7818 | 329-4511 | Piston |
| 250-2940 | 230-2569 | Retainer |
The new 20R-0631 Cylinder Pack As is adaptable back to first production on the serial numbers that are listed above. Refer to Table 2 for information on the new cylinder pack assemblies and the parts that are replaced.
| 20R-0631 Cylinder Pack As (16.3:1 Compression Ratio) | ||
| New Part Number Included | Existing Part Number | Part Description |
| 20R-0631 | 10R-8763 | Cylinder pack |
| 368-7816 | 329-4510 | Piston |
| 250-2940 | 230-2569 | Retainer |
 | |
| Illustration 1 | g02552100 |
Shape of the existing piston that is replaced | |
 | |
| Illustration 2 | g02552196 |
Shape of the new piston with the lower ring land support | |
Refer to Tables 3 and 4 for information on the parts that are included in the new cylinder pack assemblies.
| Components within the 20R-0629 Cylinder Pack As | ||
| Part Number | Description | Quantity |
| 10R-2117 | Connecting Rod | 1 |
| 180-7350 | Piston Pin | 1 |
| 223-9159 | Top Piston Ring | 1 |
| 238-2707 | Int. Ring | 1 |
| 246-5659 | Oil Ring | 1 |
| 250-2940 | Pin Retainer | 2 |
| 368-7818 | Piston Body As | 1 |
| 322-1126 | Cylinder Block Liner | 1 |
| 258-8117 | Gasket Kit | 1 |
| Components within the 20R-0631 Cylinder Pack As | ||
| Part Number | Description | Quantity |
| 10R-2117 | Connecting Rod | 1 |
| 180-7350 | Piston Pin | 1 |
| 223-9159 | Top Piston Ring | 1 |
| 238-2707 | Int. Ring | 1 |
| 246-5659 | Oil Ring | 1 |
| 250-2940 | Pin Retainer | 2 |
| 368-7816 | Piston Body As | 1 |
| 322-1126 | Cylinder Block Liner | 1 |
| 258-8117 | Gasket Kit | 1 |