Woodward PSG Hydraulic Governor | Woodward PSG Governor | Part No. 8561-631 | Hydraulic-Mechanical Governor for Marine Diesel Engines

Manufacturer

Woodward, Inc.

Country of Origin

United States

Product Type

Hydraulic-Mechanical Governor

Marine Application

Main Propulsion Diesel Engines, Auxiliary Diesel Engines, Marine Generator Engines, Industrial Diesel Engines, Offshore Power Systems

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Product Introduction

The Woodward PSG Hydraulic Governor is a heavy-duty hydraulic-mechanical governor engineered to provide precise automatic speed control for diesel engines operating under continuously changing load conditions. Designed with Woodward's proven hydraulic governor technology, the PSG series has been widely installed on commercial ships, offshore vessels, power generation systems, and industrial engines for decades.

The governor automatically adjusts engine fuel delivery to maintain a stable RPM regardless of load fluctuations, ensuring efficient fuel consumption, smooth engine performance, and reliable operation.

The Woodward PSG Governor, including Part No. 8561-631, is recognized throughout the marine industry for its rugged construction, exceptional reliability, and ease of overhaul.

SM MARINE SERVICE™ supplies New, Used, and Professionally Reconditioned Woodward PSG Hydraulic Governors, complete with repair, calibration, overhaul, spare parts, and worldwide technical support.

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What is the Woodward PSG Hydraulic Governor?

The Woodward PSG is a self-contained hydraulic-mechanical governor that maintains constant engine speed by automatically controlling the fuel injection system.

Driven mechanically from the engine gear train, the governor uses centrifugal flyweights, a hydraulic oil pump, and a servo piston to regulate fuel delivery. When engine speed changes because of varying load conditions, the governor instantly compensates by increasing or decreasing fuel flow, maintaining stable RPM without operator intervention.

The PSG governor is commonly used on:

• Main propulsion engines
• Auxiliary diesel engines
• Marine diesel generator sets
• Offshore engines
• Industrial stationary diesel engines

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Main Features

• Genuine Woodward hydraulic governor
• Self-contained hydraulic lubrication system
• Precision mechanical speed control
• Adjustable droop setting
• High-speed stability
• Excellent transient response
• Rugged cast housing
• Long operational service life
• Easy overhaul and field maintenance
• Proven performance in marine environments

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Main Components

A typical Woodward PSG Hydraulic Governor consists of:

• Governor Housing
• Hydraulic Oil Pump
• Flyweight Assembly
• Hydraulic Servo Piston
• Drive Shaft
• Governor Springs
• Speed Adjusting Mechanism
• Droop Adjustment Assembly
• Compensating Needle Valve
• Bearings
• Oil Reservoir
• Output Shaft
• Mechanical Linkage
• Seal and Gasket Kit

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Working Principle

The governor is mechanically driven by the engine. As engine speed increases or decreases, centrifugal flyweights respond accordingly and control the hydraulic pilot valve.

Hydraulic oil pressure is directed to the servo piston, which adjusts the fuel rack or throttle linkage. This closed-loop hydraulic system continuously balances engine speed with fuel delivery, ensuring smooth operation even during rapid load changes.

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Marine Applications

The Woodward PSG Hydraulic Governor is widely used on:

• Cargo Ships
• Bulk Carriers
• Container Ships
• Oil Tankers
• Chemical Tankers
• Offshore Support Vessels
• Tug Boats
• Passenger Ships
• Fishing Vessels
• Marine Generator Sets
• Industrial Diesel Engines

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Common Problems & Troubleshooting

Engine Speed Hunting

Possible causes:

• Incorrect compensating adjustment
• Worn governor springs
• Air inside governor oil circuit

Oil Leakage

Possible causes:

• Damaged seals
• Worn gaskets
• Loose fittings

Slow Governor Response

Possible causes:

• Dirty governor oil
• Blocked hydraulic passages
• Internal wear

Unstable Engine Speed

Possible causes:

• Flyweight wear
• Incorrect droop adjustment
• Servo piston wear

No Governor Action

Possible causes:

• Broken drive shaft
• Hydraulic pump failure
• Internal mechanical damage

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Preventive Maintenance

To maximize service life:

• Use the recommended governor oil.
• Replace oil at scheduled intervals.
• Inspect for oil leakage.
• Check governor linkage movement.
• Inspect bearings and seals during overhaul.
• Verify droop adjustment.
• Perform governor calibration after repairs.
• Follow Woodward maintenance recommendations.

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Why Ships Continue Using the Woodward PSG Governor

The Woodward PSG Hydraulic Governor remains widely used because of its:

• Proven long-term reliability
• Excellent speed stability
• Robust hydraulic design
• Easy maintenance
• High overhaul capability
• Worldwide spare parts availability
• Compatibility with many marine diesel engines

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Frequently Asked Questions (FAQ)

Is the Woodward PSG Hydraulic Governor repairable?

Yes. Most PSG governors can be completely overhauled, including replacement of seals, bearings, springs, hydraulic components, and calibration.

Is calibration required after overhaul?

Yes. Proper calibration ensures accurate engine speed regulation and stable governor performance.

Do you supply genuine and reconditioned PSG governors?

Yes. SM MARINE SERVICE™ supplies New, Used, and Professionally Reconditioned Woodward PSG Hydraulic Governors, including Part No. 8561-631.

Do you provide worldwide shipping?

Yes. We ship worldwide from our Bangladesh office and China warehouse.

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Short Product Description

The Woodward PSG Hydraulic Governor (Part No. 8561-631) is a precision hydraulic-mechanical speed governor designed for marine diesel engines and generator sets. It delivers accurate engine speed regulation, dependable hydraulic control, and exceptional durability, making it one of the most trusted governor systems in the marine industry.

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User Manual & Technical Resources

Typical technical documentation includes:

• User Manual
• Operation Manual
• Installation Manual
• Service Manual
• Workshop Manual
• Maintenance Manual
• Parts Catalogue
• Calibration Procedure
• Troubleshooting Guide

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SM MARINE SERVICE™

SM MARINE SERVICE™ supplies New, Used, and Professionally Reconditioned marine governors, engine automation equipment, and genuine spare parts.

We provide:

• Worldwide Supply
• Governor Repair & Overhaul
• Calibration Services
• Genuine Spare Parts
• Technical Support
• Equipment Sourcing
• Fast Worldwide Shipping

Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

China Warehouse & Support Center
Shanghai, China

Website
www.smmarineservice.com

Email
info@smmarineservice.com

WhatsApp
+8801818929292

Marketing Contact
Nazmul Hasan Bhuiyan

 

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