Woodward 8561-882 PSG Governor for Diesel Engine Speed Control

Woodward 8561-882 PSG Governor – Precision Hydraulic Speed Control for Diesel Engines

The Woodward 8561-882 PSG (Pressure Servo Governor) delivers reliable, mechanical-hydraulic speed regulation for medium to large diesel engines in marine propulsion, power generation, and industrial drive applications. Engineered for environments demanding fail-safe operation without electrical dependencies, this governor maintains stable engine speeds across varying load conditions through proven hydraulic actuation technology.

Technical Specifications

• Model: 8561-882
• Governor Type: Pressure Servo Governor (PSG)
• Control Method: Mechanical-hydraulic
• Speed Range: 600–2400 RPM (configurable)
• Regulation: ±0.25% steady-state droop
• Operating Pressure: 150–300 PSI hydraulic supply
• Ambient Temperature: -20°C to +70°C
• Mounting: SAE standard flange
• Weight: 4.5 kg

Key Applications

Marine Propulsion: Main and auxiliary diesel engines on commercial vessels, fishing boats, and offshore platforms where electrical failure cannot compromise propulsion control.

Standby Power Generation: Emergency gensets in hospitals, data centers, and critical infrastructure requiring autonomous speed regulation during grid outages.

Industrial Machinery: Pumps, compressors, and mechanical drives in oil & gas, mining, and manufacturing where hydraulic governors provide superior vibration resistance and longevity.

Engineering Solutions

The 8561-882 addresses common challenges in harsh operating environments: its all-mechanical design eliminates vulnerability to electromagnetic interference, moisture ingress, and power supply fluctuations. The integrated compensating mechanism automatically adjusts for fuel viscosity changes and wear, reducing maintenance intervals by up to 40% compared to electronic alternatives in contaminated atmospheres.

For retrofit projects, the SAE-standard mounting interface ensures drop-in compatibility with legacy Woodward UG and PG series governors, minimizing installation downtime. The governor's modular construction allows field replacement of wear components without complete unit removal.

Frequently Asked Questions

Q: Can the 8561-882 operate without external power?
A: Yes, this PSG governor is entirely mechanical-hydraulic and requires only engine-driven hydraulic pressure (typically from the engine's lubrication system). No electrical power is needed for operation.

Q: What is the typical response time to load changes?
A: The governor responds within 0.5 seconds to 10% load steps, with full recovery to setpoint in under 2 seconds, meeting ISO 8528-5 Class G2 performance.

Q: Is this compatible with electronic fuel injection systems?
A: The 8561-882 is designed for mechanical fuel racks. For EFI engines, consider pairing with a Woodward electronic actuator or explore our 2301A Speed Control Module for integrated electronic governing.

Q: What maintenance is required?
A: Inspect hydraulic connections and oil quality every 2,000 operating hours. Replace internal seals every 10,000 hours or 5 years. Detailed service procedures are included in the installation manual.

Warranty & Support

Every Woodward 8561-882 PSG Governor includes a 12-month manufacturer warranty covering defects in materials and workmanship. Our technical support team provides installation guidance, troubleshooting assistance, and calibration services to ensure optimal performance throughout the product lifecycle.

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