BELT- 5050724 - Caterpillar

Illustration 1 g00739148
Schematic of the solenoid valve for the high flow (H1)Test Step 1. CHECK FOR AN OPEN WINDING IN THE SOLENOID (H1)
Turn the key start switch to the OFF position.
Raise the cab. See Operation and Maintenance Manual, "Cab Tilting".
Disconnect the connector for the solenoid valve (high flow) (7) .
Measure the resistance of the coil (H1) from contact 1 to contact 2 of the connector.Expected Result:The resistance should be approximately 6.5 Ohms.Results:
OK - The resistance is approximately 6.5 Ohms. Proceed to Test Step 2.
NOT OK - The resistance is considerably greater than 6.5 Ohms.Repair: The solenoid coil has failed. Replace the coil. Stop.Test Step 2. CHECK FOR AN OPEN IN THE WIRE HARNESS
Reconnect the connector for the solenoid valve (high flow).
Remove the floorplate in order to get to the ECM.
Disconnect the wire harness from the ECM.
Measure the resistance from contact 24 (wire P980-OR) to contact 26 (wire L999-GN) of the wire harness connector.Expected Result:The resistance should be approximately 7 Ohms.Results:
OK - The resistance is approximately 7 Ohms.Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the values that are present on the machine configuration screen match the machine's options. Verify that the values that are present on the machine configuration screen are installed correctly. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the test steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". Stop.
NOT OK - The resistance was considerably greater than 7 Ohms.Repair: There is an open in the wire harness or a bad connection in a connector. Locate the open wire. Repair the wire harness and/or the connector or replace the wire harness and/or the connector. Stop.