HYDRAULIC CONTROL 6V1138 - Caterpillar

Illustration 1 g02976198
Section view through pump gears
Typical example
Illustration 2 g02976196
The section view is of the bypass valve that is located in the pump assembly.
Table 1
Specification for 189-8777 Engine Oil Pump Gp
Item Qty Part Specification Description
A - - Distance between the front face of the gear and the housing is 43.00 0.25 mm (1.693 0.010 inch).
B - - Length of the gear is 33.00 0.03 mm (1.299 0.001 inch).
Depth of the bore for the gear is 33.13 0.02 mm (1.304 0.001 inch).
C - - Diameter of the gear shaft is 15.600 0.005 mm (0.6142 0.0002 inch).
Bores in the pump bodies for the gear shaft is 15.641 0.008 mm (0.6158 0.0003 inch)
1 1 105-1805 Spring Length under test force is 54.5 mm (2.15 inch).
Test force is 51.99 1.90 N (11.69 0.43 lb).
Free length after test is 64.98 mm (2.558 inch).
2 1 Relief valve plunger Diameter of the plunger is 17.000 0.013 mm (0.6693 0.0005 inch).
Bore in the pump body for the plunger is 17.100 0.025 mm (0.6732 0.0010 inch).