Governor System
Woodward, Inc.
New product
The Woodward UG-8 is a proven mechanical-hydraulic governor designed to regulate the speed and load of diesel engines, generator sets, turbines, pumps, compressors, and other prime movers. It has been widely installed on marine auxiliary engines and generating sets where dependable mechanical speed control is required.
The unit shown in the supplied photographs is identified from its nameplate as a Woodward Type UG-8 Governor, bearing Part No. 8528-1017 and Serial No. 16361478. Its nameplate indicates a governor speed range of approximately 1650–1440 RPM.
| Information | Details |
|---|---|
| Manufacturer | Woodward |
| Manufacturer Origin | United States |
| Model | UG-8 |
| Product Type | Mechanical-Hydraulic Speed Governor |
| Visible Part Number | 8528-1017 |
| Visible Serial Number | 16361478 |
| Nameplate Governor Speed | 1650–1440 RPM |
| Unit Manufacturing Marking | Manufactured at Woodward Governor Company in Taiwan, China |
| Primary Function | Engine speed regulation and load control |
| Typical Marine Application | Diesel generators, auxiliary engines, propulsion engines, pumps and other prime movers |
| Control Type | Self-contained mechanical-hydraulic control |
| Available Condition | Used, refurbished, reconditioned or tested working, subject to stock |
The speed range and part number above apply to the photographed unit. UG-8 configurations can vary according to engine application, drive speed, rotation, linkage arrangement and installed options.
The Woodward UG family is one of the best-known mechanical-hydraulic governor families used in industrial and marine engine control. The UG-8 senses changes in engine speed mechanically and uses internally pressurized governor oil to reposition its output shaft.
The output shaft is mechanically connected to the engine fuel rack, fuel pump linkage, throttle mechanism or another final control device. When engine load changes, the governor adjusts the fuel-control position to restore the selected operating speed.
Unlike modern electronic governors, the standard UG-8 does not depend on an electronic control PCB, external speed sensor or software configuration for its basic governing function. This makes it suitable for older ships and machinery where ruggedness, repairability and long service life are important.
The Woodward UG-8 is a self-contained mechanical-hydraulic speed governor. It combines mechanical speed sensing, hydraulic amplification and output-shaft movement in one housing.
Its rotating flyweight or ballhead assembly reacts to engine speed:
The UG-8 can operate in an isochronous arrangement for constant-speed duty or use adjustable speed droop for load sharing between generator sets operating in parallel.
The photographed UG-8 governor has four clearly marked front controls:
Speed droop permits controlled speed reduction as load increases. It is especially important when two or more generators operate in parallel and must share load without instability.
The speed-setting control changes the governor’s reference speed. It may be used during setup, synchronization or normal engine-speed adjustment, depending on the installation.
The load-limit control restricts the maximum movement of the governor output shaft and therefore limits the maximum fuel command. On some applications, moving the load limit toward zero may also reduce fuel sufficiently for shutdown.
The idle-setting control establishes the lower operating-speed limit where the engine application requires a defined idle condition.
Adjustment must follow the engine maker’s commissioning procedure. Incorrect manipulation can cause unstable operation, poor load acceptance or overspeed risk.
The following are general published specifications for the Woodward UG-8 family. Exact values and configuration must always be confirmed against the individual nameplate, part number and engine application.
| Specification | General UG-8 Family Information |
|---|---|
| Governor Type | Mechanical-hydraulic |
| Rated Work Capacity | Approximately 13 N·m or 9 lb-ft, depending on publication and configuration |
| Maximum Output-Shaft Travel | Approximately 42° |
| Recommended Working Travel | Approximately 28° from no load to full load |
| Oil Capacity | Approximately 1.9 litres or 2 US quarts |
| Typical Internal Oil Pressure | Approximately 758–827 kPa or 110–120 psi |
| Recommended Oil | Clean oil selected according to operating temperature and Woodward oil guidance |
| Typical Oil Viscosity Range | Approximately 15–70 cSt at operating conditions |
| Dial-Type Approximate Weight | About 22 kg |
| Construction | Cast-metal housing with mechanical and hydraulic internal assemblies |
| Installation Position | Normally vertical; limited inclination may be permitted according to the manual |
| Operating Mode | Isochronous or droop, depending on application and adjustment |
The photographed unit has its own specified governor-speed range of 1650–1440 RPM. This unit-specific marking should take priority over generalized catalogue values.
The Woodward UG-8 governor commonly incorporates:
Engine rotation drives the governor’s internal oil pump and speed-sensing mechanism. The oil pump generates the hydraulic pressure needed to operate the governor power piston.
If engine speed falls, the centrifugal force produced by the rotating ballhead decreases. The speeder-spring force then moves the pilot valve away from its neutral position. Pressurized oil is directed to the power piston, which moves the terminal shaft toward an increased-fuel position.
If engine speed rises, centrifugal force increases and moves the pilot valve in the opposite direction. Oil is redirected so that the power piston reduces the fuel command.
The compensation system provides temporary feedback to prevent continuous correction and speed oscillation. When properly adjusted, the engine reaches its selected speed quickly without excessive hunting or overshoot.
Woodward UG-8 governors are commonly associated with:
Because the UG-8 was supplied in many part-number-specific configurations, compatibility should never be confirmed by model name alone. Drive-shaft type, direction of rotation, operating speed, output-shaft arrangement and required work capacity must be checked.
Possible causes include:
Check the engine and governor linkage before changing governor settings. A fuel-injection problem can resemble a governor fault.
Possible causes include:
Inspect:
Check:
Zero or unsuitable droop on multiple independently governed parallel units may cause poor load sharing.
Common leakage areas can include:
Persistent leakage should be corrected before low oil level causes unstable governing or internal damage.
Dirty or deteriorated oil is a major cause of hydraulic-governor trouble. Contamination can obstruct small hydraulic passages and interfere with pilot-valve movement.
Drain and replace the oil using the approved procedure. If the removed oil contains metal particles, sludge, water or severe discoloration, internal inspection may be necessary.
Possible causes include:
Stop the engine safely before inspecting the governor drive or linkage.
A standard mechanical Woodward UG-8 does not have an electronic display and does not generate digital alarm codes or fault messages.
Any related alarms—such as engine overspeed, generator underfrequency, overfrequency or load-sharing failure—normally originate from the engine safety system, generator protection relay, alarm-monitoring system or power-management system.
The prime mover must have an independent overspeed shutdown system. The governor itself must not be treated as the only overspeed protection device.
SM MARINE SERVICE™ can support the sourcing of Woodward UG-8 complete governors and associated components, subject to part-number verification and stock availability.
Potential supply items include:
Available conditions may include:
For correct replacement matching, buyers should provide clear photographs of the complete governor, nameplate, drive shaft, base, output-shaft arrangement and engine model.
Before ordering a replacement UG-8, confirm:
Two governors marked UG-8 may not be directly interchangeable if their internal configuration or application settings differ.
The UG-8 remains relevant because it is rugged, mechanically understandable and repairable. Many vessels continue operating engines originally designed around this governor and its linkage geometry.
Its principal advantages include:
When a vessel’s existing engine and generator system is designed for a UG-8, overhauling or sourcing the correct replacement unit can be more practical than redesigning the entire control arrangement.
The Woodward UG-8 is a mechanical-hydraulic governor used to regulate the speed and load of diesel engines, generator sets and other prime movers.
It is manufactured by Woodward, a United States-origin control-system manufacturer. The photographed unit is marked as manufactured at Woodward Governor Company in Taiwan, China.
The visible part number is 8528-1017.
The photographed nameplate shows Governor RPM 1650–1440. This is unit-specific information and must be verified when selecting a replacement.
Not automatically. The speed range, rotation, shaft, base, output configuration and application settings must be compared before interchangeability is confirmed.
New availability may be limited for some older configurations. Used, refurbished, reconditioned and tested working governors may be available through specialist marine suppliers.
SM MARINE SERVICE™ can support worldwide sourcing and supply of Woodward UG-8 governors and spare parts, subject to exact part-number verification and availability.
Many mechanical and hydraulic components can still be sourced or recovered through specialist channels. Availability depends on the exact governor version and part number.
Common causes include incorrect compensation, low or contaminated oil, binding linkage, fuel-rack problems, internal wear and improper output-shaft travel.
No. The standard mechanical UG-8 has no electronic display or internal digital alarm-code system.
Yes. Used, refurbished, reconditioned or tested working units can be sourced and supplied depending on stock availability.
Yes. Worldwide supply and shipping support are available for ship owners, managers, repair companies, shipyards and marine spare-parts buyers.
The Woodward UG-8 Part No. 8528-1017 is a mechanical-hydraulic speed governor designed for accurate speed and load control of marine diesel engines and generator sets. It features adjustable speed droop, speed setting, load limit, idle setting and hydraulic compensation. SM MARINE SERVICE™ can support worldwide supply of complete UG-8 governors and spare parts in used, refurbished, reconditioned and tested working condition, subject to availability and technical matching.
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???? Woodward Oils for Hydraulic Governors and Actuators – Reference 25071
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Always select the manual by governor type and part number. The UG Dial, Lever, pneumatic and option-equipped versions can require different publications and adjustment procedures.
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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