GENERATOR GP -E 20R0165 - Caterpillar

Test On The Machine
Install a flow meter. Run the engine at 1900 rpm. Measure the pump flow at 100 psi (690 kPa) and at 1000 psi (6900 kPa). Use these values in Formula I.Formula I: Test On The Bench
If the test bench can be run at 1000 psi and at full pump rpm, find the percent of flow loss using Formula I.If the test bench cannot be run at 1000 psi at full pump rpm, run the pump shaft at 1000 rpm. Measure the pump flow at 100 psi (690 kPa) and at 1000 psi (6900 kPa). Use these values in the top part of Formula II. For the bottom part of the formula, run the pump shaft at 2000 rpm. Measure the pump flow at 100 psi.Formula II: Operation Checks
The operation checks can be used to find leakage in the system. They can also be used to find a bad valve or pump. The speed of rod movement when the cylinders move can be used to check the condition of the cylinders and the pump.Raise and lower the blade and ripper several times. Operate the tilt control valve until the tilt cylinder is fully extended and retracted several times. 1. Watch the cylinders as they are extended and retracted. Movement must be smooth and regular.2. Listen for noise from the pump.3. Listen for the sound of the relief valve opening. The opening pressure of the relief valve is given in the subject, PRESSURE TEST OF THE MAIN RELIEF VALVE.Cylinder Speed Tests
All speed test are made with the engine at maximum rpm.System speeds that are the same as those given in the chart is an indication that the circuit operation is normal. The relief valve must be tested to be sure that the opening pressure of each is correct. (See chart for settings.)If only one of the cylinder speeds is slow, check that circuit for cylinder drift. If the travel time is not correct: 1. Check pump efficiency.2. Check the setting of the relief valve.3. Check the cylinders for leakage.4. The makeup valves could have leaks.5. The valve spools in the bulldozer control valves and in the ripper control valve could be worn.Drift Tests for Bulldozer Lift Cylinders
TEST NO. 1: Raise the front of the machine off the ground by lowering a level blade. Put the control lever in HOLD position. Shut off the engine and watch the lift cylinder rods for movement.TEST NO. 2: Raise the front of the machine off the ground by lowering a level blade. Shut off the engine. Hold the lift control lever in LOWER position. Watch the lift cylinder rods for movement.TEST NO. 3: Raise the blade off the ground. Put the control lever in HOLD position. Shut off the engine and watch the lift cylinder rods for movement.TEST NO. 4: Raise the blade off the ground. Shut off the engine. Hold the lift control lever in RAISE position. Watch the lift cylinder rod for movement. Drift Tests for Bulldozer Tilt