The part is a complete 7-core electrical connection system for the HOWO MAX 4X2 tractor, enabling reliable communication of lighting and braking signals between the truck and its trailer. This Tractor attachment kit includes a high-quality 7-core socket, a secure storage housing, and all mounting bolts and nuts required for a professional installation. When you choose authentic Howo Parts, this Tractor attachment guarantees OE fitment, weather-resistant durability, and dependable electrical continuity. Below are detailed descriptions of every component included with this Tractor attachment assembly.
The socket is the primary electrical interface of The part, featuring a 7-pin configuration that conforms to ISO 7638-1 standards for commercial vehicle trailer connections.
This Tractor attachment socket is constructed from heavy-duty impact-resistant plastic with a corrosion-proof metal contact housing, ensuring reliable signal transfer for brake lights, turn signals, tail lights, and auxiliary power circuits. The socket includes a spring-loaded protective cover that automatically closes when the trailer plug is disconnected, preventing dust, moisture, and road debris from contaminating the contacts. The terminals are gold-plated for superior conductivity and corrosion resistance,
guaranteeing consistent electrical performance over millions of connection cycles. The socket is designed for 24V vehicle systems and is rated for continuous current up to 25A, making this Tractor attachment suitable for the most demanding heavy-haul applications.
A properly maintained Tractor attachment socket ensures that all trailer lighting functions operate correctly, which is essential for road safety and compliance with traffic regulations. The socket’s housing features a built-in sealing gasket that creates a watertight seal against the mounting surface, preventing water ingress behind the panel. The part socket is compatible with all standard 7-pin trailer plugs used in Europe, Asia, and Africa.
Four M8 flange bolts are supplied to secure the socket and its storage housing to the tractor chassis.
These Tractor attachment bolts feature an integrated flange that distributes clamping load evenly across the mounting surface, eliminating the need for separate washers. The bolts are manufactured from grade 8.8 steel with a zinc-nickel coating that provides excellent corrosion resistance in the harsh under-chassis environment.
The flange head design prevents the bolt from pulling through the mounting holes of The part components, ensuring a secure, rattle-free fit. Each bolt is torqued to 25 Nm, providing the correct clamping force to maintain the electrical ground integrity of The part system. The bolts are supplied with a pre-applied thread locking patch that activates during installation, preventing loosening due to road vibration. This Tractor attachment hardware is designed to withstand the extreme conditions of long-haul trucking,
including exposure to road salt, mud, and water spray. Using the correct Tractor attachment bolts is essential for maintaining the electrical connection’s stability and preventing intermittent faults caused by movement of the socket housing.
Four M8 hex flange nuts are provided to secure The part socket and storage housing from the rear side of the mounting panel. The flange acts as a built-in washer, providing a large bearing surface that prevents the nut from embedding into the panel material. These nuts are made from zinc-plated steel and feature a self-locking serrated face that bites into the mating surface, resisting loosening under vibration.
The flange nut design simplifies installation of The part by eliminating the need for a separate washer and reducing the number of components required. Torqued to 25 Nm in combination with the flange bolts, these nuts provide a secure, stable mounting for The part socket assembly.
The flange nuts are compatible with the M8x1.25 thread pitch of the bolts, ensuring a perfect fit and optimal clamp load. The corrosion-resistant coating ensures that The part fasteners will not seize, even after years of exposure to the elements. This allows for easy removal and reinstallation of The part components during routine maintenance or replacement.
The storage of socket (7-core) is a dedicated housing that provides a secure, weather-protected storage location for The part when the trailer is disconnected. This Tractor attachment storage unit is moulded from high-impact ABS plastic with UV-stabilisers to prevent fading and cracking from prolonged sun exposure.
The housing features a spring-loaded latch that holds the socket firmly in place, preventing it from bouncing or vibrating during travel. When the trailer plug is removed, the socket is pushed into the storage housing, which seals the connector against dust, water, and road debris, preserving the gold-plated terminals for future connections.
The storage housing includes an integrated cable guide that prevents the 7-core cable from kinking or chafing, ensuring The part wiring remains intact and protected. The housing is designed to be mounted on the chassis using the supplied M8 flange bolts and nuts, positioning The part socket at a convenient height for easy access. The part storage housing also features drainage holes to prevent water accumulation inside the unit, protecting the socket from corrosion. This Tractor attachment component is engineered for long-term durability, with all hinges and latches tested for over 10,000 operation cycles.
Tractor attachment – genuine HOWO 7-core trailer socket and mounting hardware kit for MAX 4X2
This Tractor attachment provides the socket, storage housing, and all mounting hardware in one kit. No additional parts are needed to install a fully functional trailer electrical connection on the HOWO MAX 4X2.
The part socket and storage housing are made from UV-stabilised materials with sealing gaskets that resist moisture, dust, and road salt. The gold-plated terminals ensure corrosion-free signal transfer.
The M8 flange bolts and serrated flange nuts in this Tractor attachment kit provide a secure, lock-tight mounting that resists loosening under severe road vibration, ensuring consistent electrical contact.
The part storage housing protects the socket when not in use, prolonging contact life and ensuring The part is always ready for connection. The housing includes cable management features to prevent wiring damage.
The part is the electrical interface between the HOWO MAX 4X2 tractor and its trailer. The 7-core socket transmits power and signals from the tractor’s lighting and braking systems to the corresponding circuits on the trailer. When the trailer is connected, the trailer plug is inserted into the socket, and the spring-loaded latch engages, locking the plug in place. The gold-plated terminals make contact with the plug pins, completing the electrical circuit.
The part socket routes voltage to the trailer’s tail lights, brake lights, turn signals, reverse lights, and auxiliary power circuits. When the trailer is disconnected, the socket is pushed into the storage housing,
where it is protected from the elements. The M8 bolts and nuts secure The part components to the chassis, providing a stable, ground-referenced mounting point. The part system is designed to operate reliably in all weather conditions, with self-cleaning terminals that wipe clean upon each connection cycle.
Before installing The part, disconnect the vehicle battery and ensure the mounting area on the chassis is clean and dry.
Position the storage housing on the chassis and mark the four mounting holes. Drill pilot holes if required, then secure The part storage housing using the M8 flange bolts and serrated flange nuts (torque to 25 Nm). Install the socket into the storage housing, ensuring the cable routing aligns with the cable guide.
Connect the 7-core cable to the tractor’s electrical harness using the provided wiring diagram (not included). Insert the socket into the storage housing and latch it in place. Test all trailer lighting functions after reconnecting the battery. The part installation is now complete.
If The part socket fails to transmit signals, inspect the terminals for corrosion or dirt. Clean the contacts with a contact cleaner spray. A loose connection can result from under-torqued M8 bolts; retorque to 25 Nm.
If the trailer plug does not engage properly, inspect the socket’s locking latch for debris. A damaged or broken Tractor attachment socket cover can allow moisture ingress; replace the socket assembly. Intermittent electrical faults may indicate a worn storage housing latch; replace the housing to ensure the socket is fully seated. Always use genuine Tractor attachment components for repairs to guarantee correct fitment and electrical performance.
Inspect The part system every 50,000 km or annually. Check the socket terminals for corrosion and clean as needed. Examine the storage housing for cracks or damage. Verify that the M8 bolts remain tight and that The part is securely mounted.
Lubricate the socket’s locking latch with a silicone spray to ensure smooth operation. If the vehicle operates in coastal or high-salt environments, inspect The part more frequently. Replace The part socket if the terminals are pitted or the spring tension has weakened. Regular maintenance of The part ensures reliable trailer lighting and reduces the risk of roadside electrical failures.
This Tractor attachment kit is specifically designed for the HOWO MAX 4X2 tractor and is compatible with all production years from 2018 onward. The 7-core socket conforms to ISO 7638-1, making it compatible with all standard trailer plug configurations used in international haulage.
The part kit is also suitable for SITRAK C7H and HOWO T7H models that use the same chassis mounting pattern. It is not compatible with older 4-core or 5-core trailer connection systems. Always verify your trailer plug type and chassis mounting dimensions before ordering The part kit.
Aftermarket Tractor attachment sockets often use inferior plastic housings that crack under UV exposure, allowing water ingress and causing short circuits. Generic storage housings may not have a secure latching mechanism, leading to the socket falling out during travel. Non-genuine fasteners may not have the correct thread pitch or corrosion resistance,
resulting in loose components and intermittent electrical faults. A failed Tractor attachment can cause loss of trailer lighting, creating a serious safety hazard and exposing the operator to traffic fines.
Genuine HOWO Tractor attachment components are manufactured to Sinotruk’s exacting standards, using UV-stabilised materials, gold-plated terminals, and certified grade 8.8 fasteners. The small additional cost of a genuine Tractor attachment kit is insignificant compared to the safety risk and legal consequences of a malfunctioning trailer lighting system.
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