VALVE GP-CHECK 1199046 - Caterpillar

Operation Description:This procedure is used when the quickdrop function for the bowl does not operate and there are no active diagnostic codes. Test Step 1. CHECK THE CURRENT AT THE BOWL DOWN SOLENOID.Note: The ET can be used in order to measure current at the solenoids. This procedure describes the use of the multimeter and AC current probe.
Stop the machine and turn the key start switch to the OFF position.
At the bowl down solenoid, connect the 155-5175 AC Current Probe around wire R716-PK. Connect the leads from the current probe to the multimeter.
Turn the key start switch to the ON position. Do not start the engine.
Move the joystick to the position for bowl quickdrop.
Measure the current to the bowl down solenoid.Expected Result:The current at the bowl down solenoid is above 1.7 amperes.Results:
YES - The current at the bowl down solenoid is above 1.7 amperes. It is likely that there is a hydraulic problem.Repair: Diagnose the hydraulic problem and correct the problem. See the proper service manual that is listed below:
Testing and Adjusting, RENR1528, " 621G and 627G Wheel Tractor-Scrapers Hydraulic System", "Troubleshooting"
Testing and Adjusting, RENR1534, " 623G Wheel Tractor-Scraper Hydraulic System", "Troubleshooting"
Testing and Adjusting, RENR1593, " 631G and 637G Wheel Tractor-Scraper Hydraulic System", "Troubleshooting" Stop.
NO - The current at the bowl down solenoid is below 1.7 amperes. Proceed to Test Step 2.Test Step 2. CHECK THE RESISTANCE OF THE BOWL DOWN SOLENOID
Disconnect the machine harness connector from the solenoid.
At the solenoid, measure the resistance from contact 1 to contact 2.Expected Result:The resistance is approximately 5 ohms.Results:
OK - The resistance is approximately 5 ohms. Proceed to Test Step 3.
NOT OK - The resistance is not approximately equal to 5 ohms.Repair: Replace the solenoid. Stop.Test Step 3. CHECK THE WIRING HARNESS
Stop the machine and turn the key start switch to the OFF position.
Disconnect the machine harness connector J2 from the ECM.
At the bowl down solenoid, disconnect the machine harness connector from the solenoid. Connect a jumper wire across the two terminals of the wiring harness connector.
At the Machine Control ECM, measure the resistance from contact J2-62 (wire R716-PK) to contact J2-52 (wire J807-BK).Expected Result:The resistance measurement is less than 5 ohms.Results:
YES - The resistance is less than 5 ohms. The wiring is correct.Repair: Recalibrate the joystick. See Testing and Adjusting, "Bowl Control (Joystick) - Calibrate". If the problem remains after the calibration, the ECM may have failed. It is unlikely that the ECM has failed. Exit this procedure and perform this entire procedure again. If the problem still remains, replace the Machine Control ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NO - The resistance measurement is greater than 5000 ohms.Repair: The wiring harness has failed between the ECM and the bowl down solenoid. Repair the wiring harness or replace the wiring harness. Stop.