SHAFT-DRIVE 2476469 - Caterpillar

Problem: Percent of flow loss for Test 15 is 10% or More. Flow differential for Test 15 is higher than the flow differential for Test 17 by 0 to 2 gpm.
PROBABLE REASON:Pump is worn. RECOMMENDATION FOR ACTION:If flow loss is found to be too high for the machine application, install a new or rebuilt pump.Problem: Percent of flow loss for Test 15 is 10% or More. Flow differential for Test 15 is higher than the flow differential for Test 17 by 2 gpm or More.
PROBABLE REASON:A. Oil aeration (low oil level, hydraulic oil that is not the correct type, air leak in the suction line for the pump, oil leaks in the tank such as failure of seals or loose connections).B. Pump cavitation (restriction in the suction line for the pump, oil viscosity that is not correct). RECOMMENDATION FOR ACTION:Do Tests 18 through 25 to find if the reason is aeration or cavitation.Pump Test for Aeration and Cavitation
Tests 18 through 25: Aeration and Cavitation TestsThe eight tests are similar. Do the tests as follows: A. Open the manual load valve fully before starting the diesel engine.B. Run the engine at 600 rpm.C. Slowly close the manual load valve to get 1000 psi pressure.D. Write down the flow rate (gpm) and oil temperature.E. Then run the engine at 800 rpm (Test 20: 1000 rpm, Test 21: 1200 rpm, etc.) while keeping the adjustment of the manual load valve at 1000 psi pressure.F. Write down the flow rate (gpm) and oil temperature for all Tests 18 through 25.
Immediately after stopping the diesel engine, remove the Blocking Plate Assembly from the pressure line for the pump to prevent any possible damage later.
Problem: Percent of flow loss for Test 15 is 15% or More (20% or More for the 815 and 816 Compactors). Flow differential for Test 15 is 2 gpm or More than flow differential for Test 17. Tests 18 through 25 have the same flow differential.
PROBABLE REASON:Oil aeration (low oil level, hydraulic coil that is not the correct type, air leak in the suction line for the pump, oil leaks in the tank such as failure of seals, loose connections or pump cartridge is not installed correctly in pump body. RECOMMENDATION FOR ACTION: A. Check oil level and type of hydraulic oil being used.B. Check suction line for air leaks [Put foam (like shaving cream) on all connections. The foam will be pulled into the line at any point of leakage].C. Remove cover from hydraulic tank and inspect for oil leaks (check above the oil level first).D. Disassemble pump and check for correct assembly.Problem: Flow differential between each of the Tests 18 through 25 suddenly becomes lower at one test and the flow rate is the same for the remainder of the tests at higher engine speed (rpm). Example: 8 gpm difference between Tests 18 and 19, 19 and 20, 20 and 21, but 1 gpm difference between 21 and 22. Flow rate for Tests 23, 24 and 25 are