WASHER 5094458 - 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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
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 at a given rpm, the pump flow at 690 kPa (100 psi) will be larger than the pump flow at 6900 kPa (1000 psi). The difference between the pump flow of the two operating pressures is the flow loss.
Table 1
Method for determining flow loss    
    Pump flow at
690 kPa (100 psi)        
−     Pump flow at
6900 kPa (1000 psi)        
    Flow loss        
Table 2
Example of determining flow loss    
   
99 L (26 US gal)        
−    
95 L/min (25 US gpm)        
   
4 L/min (1 US gpm)        The flow loss is used to measure the pump performance. Flow loss is expressed as a percent of pump flow.
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    
4 L/min (1 US gpm)     ×     100     =     4%    
99 L (26 US gal)    Bench Test
The bench test should be run at full pump rpm in order to determine the percent of flow loss.If the bench test cannot be run 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 formula in Table 5. 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 6.
Table 5
Method for determining flow loss    
    Pump flow at
690 kPa (100 psi)        
−     Pump flow at
6900 kPa (1000 psi)        
    Flow loss        
Table 6
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 flow loss is higher than 5 percent, the pump is not functioning correctly.