A replacement stop solenoid can look nearly identical to another part and still differ in voltage, wiring, mounting, or the way it moves the fuel-control linkage. Before ordering, identify the installed unit and verify the exact application rather than choosing by appearance alone.
1. Record the machine and engine details
Write down the equipment make, model, serial number, engine make and model, and the solenoid’s installation location. Use the machine or engine parts manual to find the correct part reference. A machine model by itself may not identify the engine configuration or the correct shutdown assembly.
2. Capture every number on the old part
Photograph the label and copy all numbers exactly, including prefixes, suffixes, and voltage markings. Check the manufacturer’s parts information for superseded numbers and for whether the reference identifies a bare solenoid or a complete kit. Do not treat a similar-looking number as an interchangeable cross-reference unless the parts source confirms it.
3. Match the electrical specification
Confirm the rated voltage from the part marking and the equipment documentation. Twelve-volt and 24-volt versions exist within the same solenoid families, so the connector fitting does not establish electrical compatibility. Record the connector shape, number of terminals, wire colors or labels, and whether the original uses a separate harness or relay. Match the specified circuit design; do not assume that a two-wire and a three-wire unit can substitute for one another.
Shutdown designs can also differ in whether electrical power moves the mechanism toward shutdown or holds it in a running position. Woodward documents both energize-to-shutdown and de-energize-to-shutdown arrangements for governor shutdown solenoids. Confirm the machine’s documented operating logic before selecting a replacement, and follow the manufacturer’s service procedure for any electrical checks.
4. Compare mounting and movement
With the equipment safely shut down and the component identified according to its service manual, record the mounting-hole spacing, bracket shape and orientation, body length, plunger position, and the linkage connection. Note whether the assembly includes a return spring, protective cover, or mounting hardware. Compare these details with the catalog listing and the removed part; small differences can prevent correct installation or linkage travel.
5. Check the complete application, not just the solenoid family
Manufacturer documents show why the full kit reference matters: Woodward’s RSV governor shutdown kits specify left- or right-hand mounting, solenoid model, and 12- or 24-volt coil options. These examples are not universal fitment guidance; they show that the assembly and application details matter alongside the model number.
Browse the Stellar Spares stop-solenoid collection and compare the listed part number, machine or engine application, voltage, bracket, connector, and included components. For example, the collection lists distinct configurations such as a 12-volt kit without a bracket and a separate bracketed configuration. Check each individual listing for its stated application and what is supplied before ordering.
Stop solenoids and solenoid valves are different parts
An engine stop solenoid operates a shutdown or fuel-control mechanism. A solenoid valve instead opens or closes a fluid passage. The names overlap, but the function, body, connections, and fitment checks are different. If you need a fluid-control component, see our guide to choosing a replacement solenoid valve.
Before you order
- Confirm the machine and engine identity from their identification plates.
- Match the complete part number and any documented supersession.
- Verify rated voltage, terminal count, connector, and circuit design.
- Compare mounting orientation, dimensions, plunger connection, and included hardware.
- Use the manufacturer’s parts information when a listing or cross-reference is unclear.
A clear photo of the old solenoid label, connector, mounting face, and linkage can help resolve a mismatch before purchase. Do not rely on appearance or a broad machine-family name as proof of fit.
Sources: Woodward Manual 03013 describes different shutdown actions and voltage-specific coils; Woodward Manual 36706 documents RSV kit mounting styles and 12/24 V solenoid options; Cat part 125-5772 is an example of a specifically identified 24-volt fuel shutoff solenoid.
