12V 4 Wire Diesel Engine Stop Switch Electronic Shutdown Switch Steel Wire Flameout Controller

When a diesel will not shut down on the key, the fault is usually at the stop control rather than in the engine. This is that control: a 12 volt electric actuator that pulls the throttle lever to the stop position and lets it return on its own, replacing a cable or a lever you would otherwise have to reach by hand.

How it acts on the engine

The unit works through a wire rope. Energised, the rope applies force to the throttle lever of the diesel engine to stop it, then returns to position automatically once the signal is removed. That is the supplier's description of the mechanism and it is worth reading literally: the actuator moves an existing lever, so it has to be mounted where the rope can pull in a straight, unobstructed line. The supplier lists low working current, no heat build-up and stable operation as the characteristics of the controller, though no current figure in amps is published.

Fitment is narrow, and stated plainly

The supplier names one engine family only: Weichai. There is no second make, no engine code list and no year range, and nothing in the data supports fitting this to any other engine. The specification reference is 37axb12-220. Housing is plastic with iron internals, and at roughly 7.7 x 6 x 4.4 cm it is compact enough to sit on the oil pump handle, which is where the supplier expects it to mount.

Key features

• 12 V, four wire: the electrical configuration as the supplier states it.
• Self-returning action: the wire rope goes back to position without a separate reset.
• Reference 37axb12-220: quoted so it can be matched against an existing unit, not as a claim of origin.
• Compact housing: roughly 7.7 x 6 x 4.4 cm, intended to mount at the oil pump handle.
• Insulated shell: plastic body over iron components, per the supplier's material list.

Specifications

• Type: diesel engine stop switch / electronic shutdown actuator
• Voltage: 12 V
• Wire count: 4 wire
• Specification reference: 37axb12-220
• Stated engine: Weichai
• Dimensions: approx. 7.7 x 6 x 4.4 cm
• Weight: approx. 318 g
• Materials: plastic, iron
• Pull and hold winding arrangement: not described by the supplier
• Thread size, cable length, current draw and ingress rating: none published

What's in the box

• 1 x diesel engine stop switch
• 3 x accessories (not individually identified by the supplier)

Before you fit it

• An engine stop control is shutdown-critical. If it fails or is wired wrongly, the engine may not stop when commanded. Fitting and wiring should be done by a qualified person.
• Do not fit this to an engine outside the make the supplier states. No other fitment is published.
• No thread size or mounting hardware detail is given. Compare the photos and the 7.7 x 6 x 4.4 cm envelope against your mounting point before ordering.
• Test the shutdown function fully, with the engine under no load and clear space around it, before the machine is put back into service.

Match the reference number and the engine make first. Everything else about this part is secondary to getting those two right.

Returns, Refunds and Replacements

Products received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with local consumer laws. We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. Please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.