The Air horn device is a powerful audible warning system for the HOWO MAX 4X2 tractor, delivering a distinctive two‑tone signal for enhanced safety and visibility. This genuine HOWO kit includes the air horn, solenoid valve, mounting bracket, all pneumatic fittings, hoses, and fasteners required for a complete installation. When you choose authentic Howo Parts, this Air horn device guarantees OE fitment and reliable performance. Below are detailed descriptions of every component included with this Air horn device assembly.
The two‑tone air horn produces a powerful, penetrating sound that commands attention in traffic. This Air horn device component is made from corrosion‑resistant aluminium with a durable chrome‑plated finish, featuring dual trumpets that generate a rich, resonant tone. The horn operates on compressed air (8‑10 bar) and is designed for long‑life diaphragm reliability.
The nut holder NG6 is a spring‑steel clip that retains hex nuts on pneumatic fittings, preventing them from rotating during assembly. This Air horn device component is used on NG6 air line connections, ensuring a secure and vibration‑proof joint. Its corrosion‑resistant coating ensures long service life in the under‑chassis environment.
The circlip NG6 is a retaining ring that locks the nut holder in place on the Air horn device pneumatic fittings. Made from spring steel, it prevents axial movement of the nut holder and ensures that the fittings remain securely fastened under vibration. The circlip is essential for maintaining the integrity of the air line connections.
The elastic element NG6 is a rubber or spring‑loaded component that provides damping and preload for the Air horn device fasteners. It reduces the transmission of road vibration to the solenoid valve and air horn, extending their service life and maintaining consistent performance. This element is a critical part of the mounting system.
The M6 flange bolt secures the air horn bracket and other components of the Air horn device. With an integrated flange, it eliminates the need for a separate washer, distributing clamping load evenly. The bolt is grade 8.8, zinc‑plated, and torqued to 10 Nm, ensuring reliable retention in high‑vibration applications.
The M6 hex flange nut is used in conjunction with the flange bolt to secure the Air horn device bracket. Its flange acts as a built‑in washer, simplifying assembly and providing a large bearing surface. The nut is made from zinc‑plated steel and is torqued to 10 Nm for a vibration‑proof hold.
The two‑position three‑way solenoid valve is the electrical control unit that activates the Air horn device. It receives a 24V signal from the horn switch and directs compressed air to the horn trumpets. The valve is normally closed, with a fast response time (<20ms) and a flow capacity of 400 L/min. It is weather‑sealed and rated for continuous duty.
This straight‑through joint body connects air lines in the Air horn device pneumatic circuit. It has NG6 threads on both ends, allowing a direct, leak‑free union between hoses or fittings. The joint body is made from nickel‑plated brass, offering excellent corrosion resistance and a secure ferrule‑type seal.
The right‑angle joint body provides a 90‑degree turn in the air line, ideal for routing the Air horn device hoses in tight spaces. It features NG6 threads and a nickel‑plated brass construction, ensuring a durable, leak‑proof connection. This fitting is essential for optimising the hose routing around chassis components.
The brake plastic hose is a flexible, reinforced nylon tube that conveys compressed air to the Air horn device. It is rated for 12 bar working pressure and is resistant to oil, heat, and abrasion. Three lengths are supplied, allowing for customised routing from the air reservoir to the horn and valve.
The air horn bracket is a heavy‑duty steel mount that securely positions the Air horn device trumpets on the chassis or cab. It is powder‑coated for corrosion resistance and includes pre‑drilled holes for the horn and the solenoid valve. The bracket ensures that the horn is oriented for maximum sound projection.
Two M14x1.5 flange nuts with serrated teeth are used to secure the air horn bracket to the chassis. The serrations bite into the mating surface, providing a positive lock that prevents loosening under vibration. These nuts are torqued to 80 Nm and are essential for the safety and stability of the Air horn device.
Two M14x1.5 flange bolts with serrated heads are used with the nuts to clamp the air horn bracket. The serrated flange provides a locking action, preventing the fastener from backing out. These bolts are grade 10.9, zinc‑plated, and are torqued to 80 Nm for a secure, permanent fit.
Air horn device – genuine HOWO complete pneumatic horn and control kit for MAX 4X2
This Air horn device includes the horn, solenoid valve, bracket, all fittings, hoses, and fasteners. No additional components are required for a full installation, ensuring a seamless upgrade or replacement.
All Air horn device components are manufactured from corrosion‑resistant materials, including nickel‑plated brass, zinc‑plated steel, and chrome‑finished aluminium, ensuring durability in harsh under‑chassis conditions.
The two‑position three‑way solenoid valve in this Air horn device offers a response time of under 20 milliseconds, providing instant horn activation when the switch is pressed. This rapid actuation enhances safety in emergency situations.
The Air horn device uses serrated flange bolts, locking nuts, and elastic elements to secure the bracket and components, preventing loosening under severe vibration and ensuring a reliable, long‑lasting installation.
The Air horn device is powered by the vehicle’s compressed air system, typically supplied from the air brake reservoir. When the driver presses the horn button, a 24V electrical signal energises the solenoid valve. The valve opens,
directing pressurised air through the straight‑through and right‑angle joint bodies, and through the brake plastic hose to the two‑tone air horn trumpets. The air causes the diaphragms inside the horn to vibrate, producing a powerful, resonant sound. The nut holders, circlips, and elastic elements keep all pneumatic fittings secure and leak‑free.
The mounting bracket, bolted to the chassis with M14 fasteners, supports the weight of the horn and valve, maintaining correct alignment for optimal sound projection. The system is designed for instant response and long service life, with all components tested for durability in the demanding environment of heavy trucking. Regular inspection of the Air horn device hoses and fittings is recommended to ensure continued performance and safety.
Before installation, ensure the air system is depressurised and the battery is disconnected. Mount the air horn bracket to the chassis using the M14x1.5 flange bolts and serrated nuts, torquing to 80 Nm. Attach the two‑tone air horn to the bracket using the M6 flange bolts and nuts (torque 10 Nm). Install the solenoid valve on the bracket, securing it with the provided M6 hardware.
Cut the brake plastic hose to the required lengths and connect the air supply line from the reservoir to the valve inlet, and the valve outlet to the horn inlet. Use the straight‑through and right‑angle joint bodies to make tight, leak‑free connections.
Install the nut holders and circlips to lock the fittings. Secure the hoses with the elastic elements to prevent chafing. Connect the electrical wires to the solenoid valve (24V, polarity not critical). Reconnect the battery and air supply, then test the horn operation. The Air horn device is now ready for use.
If the Air horn device fails to sound, first check the fuse and the horn switch electrical circuit. Verify that the solenoid valve receives 24V when the switch is pressed. If voltage is present but no air flow,
inspect the valve for blockage or electrical failure. Air leaks from the fittings indicate loose joint bodies; retighten or replace the nut holders and circlips.
A weak or muted horn tone may be caused by insufficient air pressure (check reservoir pressure) or a kink in the plastic hose. Vibration noises from the bracket suggest loose fasteners; retorque the M14 bolts. Always use genuine Air horn device components for replacement to ensure correct fit and performance.
Inspect the Air horn device system annually or every 50,000 km. Check the plastic hose for cracks or chafing, and inspect all joint bodies for signs of leakage using soapy water. Ensure the solenoid valve electrical connector is secure and free from corrosion.
Retorque the bracket bolts and the M6 fasteners. Drain any moisture from the air reservoir to prevent it from entering the solenoid valve and horn. If the horn tone becomes weak, the diaphragm may be worn; replace the two‑tone air horn. Regular maintenance of the Air horn device ensures reliable operation when needed.
This Air horn device kit is specifically designed for the HOWO MAX 4X2 tractor and is compatible with all production years from 2018 onward. It fits both MC11 and MC13 engine variants. The kit is also suitable for SITRAK C7H and HOWO T7H models that share the same chassis mounting points and air system connections.
The NG6 fittings are standard for these vehicles’ auxiliary pneumatic circuits. This Air horn device kit is not compatible with older A7 or WD615 models, which use different bracket configurations and air line sizes. Always verify your vehicle’s chassis layout before ordering.
Aftermarket Air horn device components often use inferior materials, such as thin‑walled aluminium trumpets that crack or brass fittings that corrode, leading to air leaks and poor sound output. Generic solenoid valves may have slow response times or fail prematurely, leaving the driver without an effective warning device.
Non‑genuine brackets may not fit correctly, causing misalignment and vibration that can loosen fasteners over time. Genuine HOWO Air horn device components are manufactured to Sinotruk’s exacting standards,
using certified materials and precision‑engineered designs. The small additional cost of a genuine kit is insignificant compared to the safety risk of a malfunctioning horn in critical situations. For fleet operators, using genuine Air horn device kits ensures consistent performance and compliance with roadworthiness regulations.
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