RD 12/RD 12A Steering Systemwc_tx000669gb.fm 637.2 Troubleshooting the Steering SystemBackground Low hydraulic pressure in the steering circuit can be the result of a defective orworn steering valve or poor seals in the steering cylinder.A badly worn exciter pump will affect both the steering and the vibration circuitsbecause these circuits operate in series using the same supply.Note: In some cases the exciter pump may function well enough to operate the steeringcircuit but not the vibration circuit. This is due to the much lower pressure requirements ofthe steering circuit.Procedure Follow the procedure below to check the steering system.1. Remove the steering valve from the machine. See section Removing the Stee-ring Valve.2. Cap the hydraulic lines that feed the steering valve.3. Start the engine.4. Check the steering circuit relief pressure.The steering system has now been checked.WARNING! There is no steering control with the steering valve removed.f DO NOT drive the machine with the steering cylinder disconnected or inoperative!If ThenHydraulic pressure remains low Problem is in the steering valveHydraulic pressure increases Problem is in the steering cylinder
