SEAL 2770118 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
For any pump test, the pump flow at 690 kPa (100 psi) will be larger than the pump flow at 6900 kPa (1000 psi) if the pump is operating at the same rpm. The pump flow is measured in L/min (US gpm). The difference between the pump flow of two operating pressures is the flow loss.Method of determining flow loss:
Table 1
Method for determining flow loss: (1)    
Pump flow at
690 kPa (100 psi)    
217.6 L/min (57.5 US gpm)    
Pump flow at
6900 kPa (1000 psi)    
196.8 L/min (52.0 US gpm)    
Flow loss    
20.8 L/min (5.5 US gpm)    
( 1 ) Values in the formula are not values for any specific pump, or for any specific pump condition. See the specifications for the actual pump flow of a new pump at 690 kPa (100 psi) and at 6900 kPa (1000 psi).
Table 2
    Pump flow at
690 kPa (100 psi)        
-     Pump flow at
6900 kPa (1000 psi)        
    Flow loss        Example of determining flow loss:
Table 3
   
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.Method of determining the percent of flow loss:
Table 4
Flow loss (L/min or US gpm)     ×     100     =     Percent of flow loss    
Pump flow at
690 kPa (100 psi)    Example of determining the percent of flow loss:
Table 5
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 the pump flow of a new pump at 690 kPa (100 psi) and at 6900 kPa (1000 psi).Machine Test
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 the formula below.
Table 6
    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)    Bench Test
If the bench test can be run at 6900 kPa (1000 psi) and at full pump rpm, determine the percent of flow loss