Woodward 8561-738 PSG Retrofit Governor
19° RH SHAFT · 3-SLOT PORTING · CCW ROTATION
Product Description
Model identityWoodward 8561-738 is a PSG governor retrofit part number for the Woodward SG-to-PSG conversion family. It identifies a vertical-mounted PSG governor configuration with CCW rotation, a solid two-weight ballhead and a defined shaft and porting arrangement.
For Woodward 8561-738, the speed-adjusting shaft is single notched at 19° RH and the terminal shaft is single serrated RH. The governor uses a standard splined drive shaft, 3-slot porting and a horizontal RH return spring; no speed-setting motor is fitted.
At installation, Woodward 8561-738 carries a high-speed stop factory setting of 4000 that must be adjusted to 3900. The PSG base is about 11 mm thicker than the SG base, raising the terminal and speed-adjusting shafts by about 11 mm and requiring the mounting and oil-path geometry to be checked together.
Technical Specifications
Configuration data| Technical item | 8561-738 value |
|---|---|
| Brand | Woodward |
| Product type | PSG governor retrofit part number |
| Series | PSG governor |
| Associated SG part numbers | 8512-132; 8512-133 |
| Speed-adjusting shaft | Single notched, 19° RH |
| Terminal shaft | Single serrated, RH |
| Ballhead | Solid with 2 weights |
| Porting | 3 slot |
| Drive shaft | Standard splined |
| Governor mounting | Vertical |
| Rotation | CCW |
| Return spring | Horizontal (RH) |
| High-speed stop | Factory set at 4000; adjust to 3900 at installation |
| Low-speed stop | Adjustable 0–1000 |
| Speed-setting motor | None |
Operating Characteristics
Governor behaviourWoodward 8561-738 uses a defined speed-limit and mechanical configuration so the PSG retrofit can be set against its governor record before the driven equipment is returned to service.
The factory setting is 4000; the installation setting is 3900.
The low-speed stop is adjustable from 0 to 1000, while the speed-setting motor is not fitted.
The solid two-weight ballhead, CCW rotation and RH horizontal spring define the governor response arrangement.
Installation Highlights
Mounting and oil pathThe installation of Woodward 8561-738 depends on PSG mounting geometry, shaft positions and the oil connection rather than on the part number alone.
The drive-shaft and mounting-base bolt pattern is shared with the SG arrangement.
The PSG base is about 11 mm thicker; the shafts sit about 11 mm higher and the mounting bolts need about 11 mm more length.
The PSG oil inlet is on the left side; any fuel-rack linkage or oil-pipe adaptation must be checked at the equipment boundary.
Frequently Asked Questions
Field questionsHow should Woodward 8561-738 be set before the governor is put into service?
Set the high-speed stop to 3900 during installation, then verify the mechanical stop and linkage movement before operation. The part is factory set at 4000, so the installation adjustment is part of the specified configuration.
What shaft and porting details must match when selecting Woodward 8561-738?
Match the single-notched 19° RH speed-adjusting shaft, single-serrated RH terminal shaft and 3-slot porting to the governor record. A similar shaft appearance is not enough to establish the required fit.
Can Woodward 8561-738 use the same mounting arrangement as an SG governor?
The drive-shaft and mounting-base bolt pattern between the SG and PSG governor is identified as identical, but the PSG base is about 11 mm thicker. Allow for the higher shaft position and use mounting bolts about 11 mm more in length for the PSG arrangement.
Which rotation and return-spring orientation belong to Woodward 8561-738?
Use the CCW rotation and horizontal RH return-spring arrangement listed for Woodward 8561-738. Confirm the installed linkage direction and spring orientation before connecting the governor to the driven mechanism.
Where should the oil connection be checked on a Woodward 8561-738 retrofit?
Check the oil inlet on the left side of the PSG governor and compare it with the existing pipe route. The SG arrangement can have a left- or right-side inlet depending on drive-shaft rotation, so the connection may require a minor adaptation.
How can a Woodward 8561-738 speed-limit problem be isolated after installation?
Check the high-speed stop setting, the low-speed stop range and the linkage travel separately, then verify the shaft direction against the CCW configuration. Do not infer a governor fault from a limit mismatch until the mechanical stop and connection geometry have been checked.
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For a Woodward 8561-738 enquiry, the assigned sales manager keeps the complete model and governor configuration together, provides lead-time information, coordinates requested carriers and supplies tracking details for shipped orders.
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