These hoses carry fluid under high pressure from the pump to the control valve or actuator. On a diagram, these are usually the thickest solid lines. They connect the main hydraulic pump to the selective control valves (SCVs). If a diagram shows a line coming directly from a pump symbol, it is a pressure line.
Identifying line types is critical for accurate troubleshooting: John Deere Hydraulic Hose Diagram
If a hydraulic function is slow or not working, the diagram becomes a diagnostic tool. These hoses carry fluid under high pressure from
: Excellent for finding common maintenance parts and high-level hose configurations for lawn and garden or compact utility tractors. John Deere Hydraulic Hose Diagram