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Toro TMC-212 Hydraulic System: Diagnosing a Stuck-On Zone

Hydraulic Conversion Kits Explained

The devices below your controller are a hydraulic conversion kit – allowing an electric controller to operate old hydraulic valves via tubing. One zone stuck on usually indicates a valve problem, not the conversion kit.

Diagnostic Swap Test

Swap tubing between stuck zone and working zone at conversion kit.
If original stuck zone still runs → valve is faulty.
If swapped zone now sticks → conversion kit solenoid is bad.

Long-Term Solution

Replace hydraulic valves with modern electric solenoid valves. Rewire directly to controller. Benefits: parts availability, rebuildable valves, no tubing leaks. Hydraulic systems are 40+ years old; conversion kits are obsolete technology.

Irrigation: Purging Irrigation System: Manual Valve Operation Guide; Toro 4‑Zone Hydraulic System: Two Stations Don’t Water – Valve Problem; Hunter XC Controller Zone 6 Stuck On: Diagnosis and Repair; Irrigation Pump Runs But No Water at Valves—Master Valve or Pump Relay; Identifying Vintage Brass Hydraulic Valves: The Imperial Brand; Toro Zone 4 Runs Constantly: Manual Valve Operation Guide; Hardie HR-6100 All Zones Run on Water Turn-On: Valve Bleed Screws Left Open; Toro Greenskeeper: One Zone Stays On Continuously; Irrigation System Design: Trenching, Well Pump, and Backflow; All Six Toro Valves Stuck Open After Winter: Pressure and Sequence Fix

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