ADHESIVE-BULK 4773770 - Caterpillar

Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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.
This test is designed to tell if a pump is operating within the design parameters.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 at the same rpm is the flow loss. Test on the Machine
Install a hydraulic flow tester on the machine. Record the pump flow at 1000 rpm and 690 kPa (100 psi). Record the pump flow at 1000 rpm and 6900 kPa (1000 psi). In order to calculate the flow loss, use the formula in table 1. Run the engine at full load rpm and record the pump flow at 690 kPa (100 psi). Use these values in the following formula.
Table 1
Method for determining flow loss    
Pump flow at 1000 rpm and
690 kPa (100 psi)    
- Pump flow at 1000 rpm and
6900 kPa (1000 psi)    
= Flow loss (L/min or US gpm)    
Table 2
Method for determining percent of flow loss on the machine    
Flow loss (L/min or US gpm)     × 100 = Percent of flow loss    
Pump flow at full load rpm and
690 kPa (100 psi)    If the percent of flow loss is greater than 10%, the pump performance is inadequate.Test on the Bench
Record the pump flow at 1000 rpm and 690 kPa (100 psi). Record the pump flow at 1000 rpm and 6900 kPa (1000 psi). In order to calculate the flow loss, use the formula in table 3. Run the test bench at 2000 rpm and record the pump flow at 690 kPa (100 psi). Use these values in the following formula.
Table 3
Method for determining flow loss    
Pump flow at 1000 rpm and
690 kPa (100 psi)    
- Pump flow at 1000 rpm and
6900 kPa (1000 psi)    
= Flow loss (L/min or US gpm)    
Table 4
Method for determining percent of flow loss on the