TURBOCHARGER GP 3899185 - Caterpillar

Table 1
Method of determining flow loss
Pump flow at 690 kPa (100 psi)
− Pump flow at 6900 kPa (1000 psi)
Flow loss
Table 2
Example of determining the flow loss
217.6 L/min (57.5 US gpm)
− 196.8 L/min (52.0 US gpm)
20.8 L/min (5.5 US gpm) Flow loss that is expressed as a percentage of pump flow is used as a measure of pump performance.
Table 3
Method of determining percent of flow loss
Flow loss (L/min or US gpm) × 100 = Percent of flow loss
Pump flow at 690 kPa (100 psi)
Table 4
Example of determining percent of flow loss
20.8 L (5.5 US gal) × 100 = 9.5%
217.6 L/min (57.5 US gpm) Note: The values in the examples are not set values for any specific pump or for any specific pump condition. See the Specification for your machine for the pump flow of a new pump at 690 kPa (100 psi) and at 6900 kPa (1000 psi).Test on the Machine
Install a flow meter. Run the engine at high idle. Measure the pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi). Use these values in Formula 1 in Table 5.
Table 5
Formula 1
Pump flow at 690 kPa (100 psi)
− Pump flow at 6900 kPa (1000 psi) × 100 = Percent of flow loss
Pump flow at 690 kPa (100 psi) Test on the Bench
If the bench test can be performed at 6900 kPa (1000 psi) and at full pump rpm, determine the percent of flow loss by using Formula 1 in Table 5.If the bench test cannot be performed at 6900 kPa (1000 psi) or at full pump rpm, run the pump shaft at 1000 rpm. Measure the pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi). Use these values in the top portion of Formula 2 in Table 6. For the bottom part of the formula, run the pump shaft at 2000 rpm. Measure the pump flow at 690 kPa (100 psi).
Table 6
Formula 2
Pump flow at 690 kPa (100 psi)
Pump flow at 6900 kPa (1000 psi) × 100 = % percent of flow loss
Pump flow at 690 kPa (100 psi) and at 2000 rpm