BOOM & BEARING AS 2098872 - Caterpillar

Table 1
Required Tools    
Part Number     Description     Quantity    
4C-9910     Flow Meter     1    This test is designed to determine whether a pump is operating within design parameters.Note: Pump failure will generally begin with loss of efficiency at low idle, and in conditions that have high oil operating temperature. If the pump efficiency improves after increasing the speed of the engine, or after the oil is allowed to cool, test the pump first.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.
Table 2
Method for determining flow loss    
    Pump flow at
690 kPa (100 psi)        
-     Pump flow at
6900 kPa (1000 psi)        
    Flow loss        
Table 3
Example of determining 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)        The flow loss is used to measure the pump performance. Flow loss is expressed as a percent of pump flow.
Table 4
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 5
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)    If the percent of flow loss is greater than 10%, replace the pump.Bench Test
The bench test should be performed at full pump rpm in order to determine the percent of flow loss.If the bench test cannot be performed 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 Table 6. Run the pump shaft at 2000 rpm. Measure the pump flow at 690 kPa (100 psi). Use this value in the formula that is in Table 7.
Table 6
Method for determining flow loss    
    Pump flow at
690 kPa (100 psi)        
-     Pump flow at
6900 kPa (1000 psi)        
    Flow loss        
Table 7
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)    If the percent of flow loss is greater than 10%, replace the pump.