John Deere Fault Code
Free · no signupF402
Machine won't move; One track dead; Swing function fails.
System
RCU
Symptom
Machine won't move; One track dead; Swing function fails.
Diagnosis & fix steps
Solenoid Valve (General) Fault.
LOGIC: The RCU sees an open circuit or short in one of the hydraulic control solenoids.
ACTION: 1. Check the solenoid bank (behind the cab or by the pump).
2. Ohm-test the coil (usually 10-30 ohms).
FIX: Replace the faulty Solenoid Coil or repair the harness.
Red Seal field insights
Deere uses many identical solenoids. In a pinch, you can swap a "working" solenoid (like the Travel Speed) with a "failed" one (like the Arm-In) to see if the fault follows the coil.
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