BEARING-NEEDLE 2478715 - Caterpillar

The solenoid is used to shutoff, release, distribute, or mix fluids on the machine. Generally, multiple solenoids are located together on a manifold. The solenoid converts electrical energy into magnetic energy, moving a spool located inside the housing of the valve. A spring is used to hold the spool in position until the solenoid is energized.The magnetic force that acts on the valve spool is created when a coil inside the solenoid is energized. Possible causes for an FMI 3 diagnostic code are:
The harness is shorted.
The Implement ECM has failed. A failure of the ECM is unlikely.Possible causes for an FMI 4 diagnostic code are:
There is an open in the circuit.
The harness is shorted to ground.
The solenoid has failed.
The ECM has failed. A failure of the ECM is unlikely.
Illustration 2 g03815004
Implement ECM 2 Solenoid Connections
Note: The diagram above is a simplified schematics of ECM connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR6408 for the complete schematic.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring harness for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.
FMI 3 diagnostic code, proceed to Table 3.
FMI 4 diagnostic code, proceed to Table 4.
Table 3
FMI 3 Troubleshooting
Troubleshooting Test Steps Values Results
1. Check The Machine Harness For A Short
A. Turn the key start switch and the disconnect switch OFF.
B. Disconnect the harness connection at solenoid.
C. Disconnect the harness connection at the ECM.
D. Measure the resistance of solenoid signal contact to all other ECM connections.
Each reading is greater than 5K Ω. OK - All resistance readings are greater than 5K Ω .
Proceed to Test Step 2.
NOT OK - One or more readings are less than 5 Ω.
Repair: A short exists between the signal contact and the circuit with the low resistance. Repair or replace the machine harness.
Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit.
Proceed to Test Step 2.
2. Check If The Diagnostic Code Remains
A. Reconnect all harness connectors. Return machine to normal operating condition.
B. Turn the key start switch and the disconnect switch ON.
C. Clear all diagnostic codes.
D. Operate the machine.
E. Stop the machine and engage the safety lock lever.
F. Check if the diagnostic code is active.
The diagnostic code is no longer