The 8256-080 is a high-performance rotary electric actuator manufactured by Woodward, specifically designed for precise fuel control in prime movers such as diesel and gas engines. This unit features a Counter-Clockwise (CCW) rotation and an integrated return spring, ensuring the actuator returns to a fail-safe position (usually minimum fuel) in the event of a power loss.

Technical Specifications

• Model Series: 8256 (Electric Rotary Actuator).

• Rotation Direction: Counter-Clockwise (CCW) looking at the shaft.

• Return Mechanism: Internal Spring Return (fail-safe).

• Operating Voltage: 24 VDC (Standard).

• Dimensions: Approximately 7.5 inches (length) x 6.0 inches (diameter).

• Weight: Approximately 4.8 kg (10.6 lbs).

• Country of Origin: United States.

Application Fields

⚡ Power Generation: Used to control fuel racks or throttle valves on emergency generator sets. 🚢 Marine Propulsion: Integrated into engine governors for precision speed and load control. 🏭 Industrial Compression: Controls fuel or intake air flow on reciprocating gas compressors.

Product Usage Instructions

💡 Mounting: Ensure the actuator is mounted securely to the engine or governor drive bracket using the provided bolt holes. 🛠️ Linkage: Adjust the linkage length so that at the minimum actuator position, the engine fuel rack is at “stop,” and at the maximum position, it is at “full load.” ✅ Electrical: Connect the 24VDC control supply. Verify the polarity; reversing the connection may damage the internal electronics or cause incorrect rotation.

Common Questions & Answers

Q: What does the “Spring Return” feature provide? A: It provides a “Fail-to-Minimum-Fuel” safety function. If the electronic control signal or power supply is lost, the internal spring mechanically forces the actuator shaft back to the zero-fuel position, shutting down the engine to prevent overspeed. Q: How do I calibrate the travel limits? A: Travel is typically limited by mechanical stops on the linkage or the internal design. Ensure the control signal (from the governor controller) corresponds to the full travel range of the engine’s throttle arm. Q: Can I use this on a clockwise application? A: No. The 8256-080 is specifically built for CCW rotation. Installing it on a system requiring CW rotation will cause the fuel control to operate in reverse, potentially leading to engine runaway.

Product Maintenance Instructions

Regularly inspect the output shaft for signs of seal leakage, as oil ingress can degrade the internal motor windings. Check the linkage rod ends for play or wear; loose linkages can cause “hunting” or unstable engine speed control. In dusty or high-vibration environments, verify that the electrical connector is tight and free of corrosion. Lubricate the linkage joints periodically with high-temperature industrial lubricant to ensure smooth, responsive operation.

Recommended Similar Models

• 8256-081 (Clockwise version)

• 8256-074

• 8256-003

• 8256-070

• Woodward 1724/1712 Series Actuators