8516-039 or 8516-040: Which TG-13 Governor Do You Need?
Woodward 8516-039 and 8516-040 are TG-13 mechanical-hydraulic speed-droop governors for steam turbine applications. The unprefixed 8516-039 is rated at 4,000 RPM, while 8516-040 is rated at 6,000 RPM. Both are listed for counterclockwise drive rotation. Check the complete number on the installed governor before selecting a replacement; prefixed versions can have different specifications.
| Original TG-13 part no. | Rated speed | Drive rotation | Woodward preferred TG611-13 reference |
|---|---|---|---|
| 8516-039 | 4,000 RPM | CCW | 8516-179 |
| A8516-039 | 4,000 RPM | CW | 8516-180 |
| 8516-040 | 6,000 RPM | CCW | 8516-183 |
| A8516-040 | 6,000 RPM | CW | 8516-184 |
Source: Woodward Product Change Notification 07002, Rev. A, page 2. CW = clockwise; CCW = counterclockwise. Rotation is viewed from the top of the governor, as defined in Woodward Manual 04042.
The listed TG611-13 preferred items include an overspeed test device (OTD). These references help identify the appropriate newer configuration; they do not by themselves establish mechanical interchangeability.
TG-13 Operation and Mechanical Specifications
The TG-13 uses mechanical-hydraulic speed-droop control, rather than electronic speed regulation. Woodward Manual 04042 gives the following family-level specifications:
- Terminal-shaft travel: 40° maximum.
- Work capacity: 12.2 ft-lb (16.5 J) maximum over the full 40° travel.
- Speed setting: screw-type setting for the part numbers listed above.
The usable governor output travel and turbine linkage must be checked against the installed arrangement. The manual recommends using approximately two-thirds of full governor travel from no load to full load.
Check the Installed Configuration Before Ordering
Part number and mechanical fit
- Read the complete nameplate, including any letter prefix.
- Match the governor drive speed and CW/CCW direction.
- Compare mounting, terminal-shaft linkage and speed-setting arrangement.
Operating and protection requirements
- Check the existing turbine overspeed-protection arrangement before considering a TG611-13 unit with OTD.
- Review operating oil temperature. Some high-speed TG applications require an oil heat exchanger.
- Obtain engineering approval for any change from the installed configuration.
Installation and commissioning should follow Woodward Manual 04042 and the turbine manufacturer's procedures.
Confirm Your TG-13 Model
Send the nameplate photo and original part number. Include the turbine model if you are considering a TG611-13 replacement.
TG-13 Availability and Repair Support
Woodward's Product Change Notification 07002 lists 8516-039 and 8516-040 among the legacy TG-13 Last Time Buy items. Woodward stopped accepting new purchases of these listed part numbers from 31 March 2026 and states that repair and overhaul support continues until 31 March 2031.
Existing surplus or reconditioned units may still be available through independent suppliers. For a quotation, request the actual unit's part number, condition, photographs, inspection details and lead time. Availability is confirmed against the specific item offered.
Woodward TG-13 Manuals and Model References
Woodward TG-13 FAQs
Q: Can 8516-039 be used in place of 8516-040?
A: Not as a direct substitution. The original parts have different rated speeds-4,000 and 6,000 RPM. Match the nameplate, drive rotation and turbine installation first.
Q: What is the difference between 8516-039 and A8516-039?
A: Woodward lists 8516-039 as CCW and A8516-039 as CW. Both are rated at 4,000 RPM, but their specified drive rotations differ.
Q: Is TG611-13 8516-179 a direct replacement for 8516-039?
A: Woodward lists 8516-179 as the preferred reference. The TG611-13 configuration includes an overspeed test device, so mounting, linkage and protection requirements need engineering review before substitution.
Q: Are 8516-039 and 8516-040 still supplied new by Woodward?
A: No. These legacy part numbers reached Woodward's Last Time Buy cutoff on 31 March 2026. Independent stock and repair options must be checked separately.
Q: Does a 6,000 RPM TG-13 need an oil cooler?
A: Not in every installation. Woodward Manual 04042 notes that some high-speed TG applications need an oil heat exchanger, depending on operating temperature and oil conditions.
Woodward Governor and Turbine-Control Parts
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Request a Quote for TG-13 Parts
Include the full Woodward part number, quantity, required condition, delivery country and any available nameplate or mounting photos.