Caterpillar 7W-6722 Governor / Speed Actuator Assembly
Specifications
| Part type | Electronic governor / speed actuator assembly (Actuator AS) | |
|---|---|---|
| Caterpillar part number | 7W-6722 (also shown as 7W6722, CA7W6722) | |
| Engine applications | Caterpillar 3508, 3508C, 3512, 3512B, 3516 | |
| Generator / package applications | SR4, SR5, SR4B, SR4BHV, G3512, G3516, PM3508, PM3512, PM3516 | |
| Weight | Approx. 19.4 lb (8.8 kg) | |
| Overall dimensions | Approx. 13.3-13.4 in length x 7.3-9.8 in width x 7-8.3 in height (varies by source) | |
| Function | Converts governor/ECM control signal into mechanical fuel-rack movement to regulate engine speed |
Technical notes
The 7W-6722 is Caterpillar's Actuator Assembly used on the 3500-series fuel system, including the 3512B marine engine as well as the 3508/3508C, 3512 and 3516 platforms and their SR4/SR5 and PM/G generator packages. It serves as the electrohydraulic/electromechanical link between the governor or electronic control and the fuel rack, translating the speed-control signal into rack travel so the engine holds its commanded rpm under varying load. Distributors confirm a service weight near 19.4 lb (8.8 kg). On the 3512B it is a primary speed-governing component, so a failed or sluggish actuator typically presents as hunting, overspeed, or failure to reach rated rpm. Replacement units are sold both as genuine Cat and as rebuilt/aftermarket equivalents; confirm exact configuration against Cat SIS for the specific engine serial-number arrangement before fitting.
Compliance
Replacement engine fuel-system governing component; verify exact fitment against the engine serial number and Caterpillar SIS, and follow Cat service procedures, as no marine class or regulatory certification is asserted by the distributor listings reviewed.
Compatibility
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Related
●RFQ answered within ~4 h at major hubs routed to vetted suppliers no public pricing
Frequently asked questions
- Does Caterpillar 7W-6722 fit the 3512B marine engine?
- Yes. Distributor listings (e.g. FridayParts) explicitly list the 3512B among the engine applications for the 7W-6722 actuator assembly, alongside the 3508/3508C, 3512 and 3516.
- What does the 7W-6722 actuator do?
- It is a governor/speed actuator that converts the governor or electronic control signal into mechanical fuel-rack movement, regulating engine speed and fuel delivery on 3500-series engines.
- Is the 7W-6722 available as a genuine Cat part or only aftermarket?
- Both. It is listed on the official Cat Parts Store as well as by independent distributors offering new-aftermarket and rebuilt equivalents, typically with a warranty.
Caterpillar 7W-6722 Governor / Speed Actuator Assembly
No public pricing — quoted per request