BLOCK 5240006 - Caterpillar

Hot oil and components can cause personal injury.Do not allow hot oil or components to contact skin.
The probable cause may be listed below.
The oil level is low.
The hydraulic oil cooler is plugged.
The hydraulic pump is badly worn.
The setting on one of the dump valves is too low.
There is air in the oil (oil aeration).
There are heavy hydraulic loads that cause one of the dump valves to open.
There is a restriction of the flow of oil through the system.
There is a high pressure leak in one or more circuits.
The oil is very dirty.
The bypass valve for air could be stuck open.
The oil bypass valve could be stuck open.The problem is a jerky erratic operation.The probable cause may be listed below.
Illustration 1 g00638122
Note 1Refer to the Testing and Adjusting, KENR5016-02, "Conveyor Hydraulic System Air - Purge" in order to perform this procedure.Note 2Refer to Testing and Adjusting, KENR5016-02, "Control Valve (Conveyor) - Test and Adjust" in order to perform this procedure.Note 3Refer to Disassembly and Assembly Manual, KENR2888 in order to perform this procedure.Test 1Conduct the following test with a 6V-7070 Digital Multimeter that is installed in series with the coil for the control valve. The current range is 0-1100 mA. Do not start the engine, but turn the engine start switch to the ON position. Apply the parking brake control and place the maximum propel speed potentiometer to one half. Move the propel control to the forward position. Select the AUTO position for the feeder auto/manual control and auger auto/manual control. Adjust the conveyor speed ratio control and the mix height control in order to obtain an output of 700 mA to the coil. The current should remain steady with no fluctuation in order to pass the test.Test 2Use pins #5 and #39 (left side) and pins #6 and #39 (right side) in order to test the duty cycle to the conveyor electronic control module from the potentiometer for the mix height control and the sensor buffer for the PWM sensor. The duty cycle is increased and decreased by turning the mix height control. Test the duty cycle at 30%, 50% and 70% of the output signal from the sensor buffer of the PWM sensor. The signal needs to remain steady with no fluctuation in order to pass the test. If the duty cycle fluctuates, test the potentiometer resistance of the mix height. As the knob is rotated, the resistance should be steady. As the knob is rotated, the resistance should increase in increments or the resistance should decrease in increments. Replace the potentiometer if the potentiometer is faulty. If the potentiometer of the mix height control functions properly, replace the sensor buffer of the PWM sensor. Calibrate the conveyor electronic control module.Test 3Use pins #27 and #39 (left side) and pins #28 and #39 (right side) in order to test the duty cycle to the conveyor electronic control module from the sonic feeder control sensor or the feeder control sensor paddle. Test the feeder control sensor paddle in order