BUSHING 5378507 - Caterpillar

Table 1
Description     Former Part Number     New Part Number    
Gear Pump Group     155-3609     337-9944    
Gear Assembly     151-8285     337-9943    
Coupling     221-3403     335-1995    The improved coupler is effective with the following machines:
D8R (S/N: 9EM4688-UP)The improved coupler is adaptable to the following machines:
D8R (S/N: 9EM1-4687)The new 335-1995 Coupling can be used in conjunction with the following parts:
The former 155-3609 Gear Pump Group or the new 337-9944 Gear Pump Group
The former 151-8285 Gear Shaft Assembly or the new 337-9943 Gear Shaft Assembly The former 221-3403 Coupling can only be used if the coupling has been reworked to the dimensions that are in Illustration 1. The former coupling can also be used if the fit for the coupling to the gear assembly is correct. See Illustration 3.
Illustration 1 g01680563
(A) The correct dimension for the counterbore is 10.5 0.25 mm (0.413 0.010 inch).The former 221-3403 Coupling can be reworked by making the counterbore 2 mm (0.079 inch) deeper. See Illustration 1.
Illustration 2 g01654736
(1) The former 221-3403 Coupling (B) With a coupler that is sitting freely on top of the gear assembly, a gap between the end of the coupler and the face of the pump indicates that a thrust load will occur.
Illustration 3 g01654737
(2) The improved 335-1995 Coupling (B) With a coupler that is sitting freely on top of the gear assembly, no gap between the end of the coupler and the face of the pump indicates that no thrust load will occur.