Locating Buried Hydraulic Valves Without Boxes

Finding Direct-Buried Toro Hydraulic Valves

On older Toro hydraulic systems where valves are buried without boxes, a stuck-open valve and single-station operation indicate a hydraulic line issue or valve failure.

Location Methods

1. Metal detector: The 2-inch metal band on the valve housing is detectable. Sweep slowly in a grid pattern.
2. Pipe tracing from a known head: Dig down at the nearest sprinkler head, expose the lateral, and follow it back toward the valve (typically 3–6 ft away). "Pothole" every 3 ft to stay on the pipe.
3. Hydraulic tubing: Follow the small-diameter control tubing from the controller to the valve manifold.

Stuck-Open Valve Fix

• Debris in the valve seat or a torn diaphragm prevents closure.
• Disassemble, clean, replace diaphragm, and reassemble.
• Consider installing valve boxes during repair for future access.