Each step in the diagnostic process should be driven by a logical and evidence-based progression. Components should only be removed and replaced when there is a strong indication, based on symptoms and testing, that they are the source of the issue. This philosophy...
The directional valve is usually the easier of the two components to check first. Begin by confirming that the valve’s solenoids are operating correctly. You can use a small metal tool like a screwdriver or a thin steel ruler to detect the magnetic field from the...
