SPACER 9R9407 - Caterpillar

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)
390D (S/N: WAG1-UP; BYP1-UP; WAP1-UP; WBT1-UP; KCZ1-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)
AD55 (S/N: DNW1-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)
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)
Service Magazine SEPD1771, 18 April 2014, "New Cylinder Pack Assemblies Are Available in Sets for Certain Machines Equipped with C18 Engines ". Disregard this article. The effectivity has been updated.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.
Table 1
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.
Table 2
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 supportRefer to Tables 3 and 4 for information on the parts that are included in the new cylinder pack assemblies.
Table 3
Components within the 20R-0629 Cylinder Pack As    
Part Number     Description     Quantity    
10R-2117     Connecting Rod     1    
180-7350