The Cab door latch system is a comprehensive set of mechanical components that control the opening, closing, and locking of the driver and passenger doors on the HOWO MAX 4X2 tractor. This genuine HOWO kit includes inward and outward opening handles, lock rods, lock assemblies, stay wires, brackets, blanking caps, and all specialised fasteners required for a full door latch overhaul. When you choose authentic Howo Parts, this Cab door latch kit guarantees OE fitment, smooth operation, and long‑term durability. Below are detailed descriptions of every component included with this Cab door latch assembly.
The inward opening stay wire is a flexible steel cable that connects the inner door handle to the lock mechanism. This Cab door latch component allows the driver or passenger to open the door from inside the cab. Two cables are supplied, made from galvanised steel with a plastic outer sheath for smooth movement and corrosion protection.
The lock catch assembly is the striker plate mounted on the door frame that receives the door latch bolt. This Cab door latch part ensures the door closes securely and stays latched. Two assemblies are supplied, each made from hardened steel with a zinc‑plated finish and elongated adjustment slots for precise alignment.
The left inward opening handle is the interior door handle for the driver’s side. This Cab door latch component is made from impact‑resistant ABS plastic with a chrome‑plated finish, featuring an ergonomic pull design. It includes a return spring and is pre‑drilled for the stay wire attachment.
This bracket mounts the inward opening handle to the inner door panel. Two brackets are supplied, made from stamped steel with a corrosion‑resistant coating. The bracket provides the correct spacing and pivot point for smooth handle operation, ensuring the Cab door latch mechanism moves freely.
The right inward opening handle is the interior door handle for the passenger side. This Cab door latch handle is symmetrical to the left version but mirrored for the right door. It offers the same ergonomic design, durable construction, and chrome finish as the left handle.
Two door outer opening assemblies (YG1671340012 and YG1671340022) are provided for the left and right doors. Each assembly includes the exterior door handle, linkage, and pivot mechanism. These Cab door latch components are made from die‑cast zinc alloy with a chrome‑plated finish, designed for frequent use in harsh weather.
The left lock core pull rod connects the door lock cylinder to the latch mechanism. This Cab door latch rod is made from steel with a plastic coating, transferring rotational motion from the key cylinder to unlock the door. It is pre‑bent to the correct shape for the left door.
This pull rod connects the outer door handle to the latch mechanism on the left door. The Cab door latch rod is made from spring steel with a durable coating, ensuring reliable force transmission from the exterior handle to the latch release.
Two door lock assemblies (WG1671340151 and WG1671340152) are supplied for the left and right doors. Each assembly includes the latch bolt, pawl, return springs, and housing. These Cab door latch units are precision‑machined from steel with a corrosion‑resistant coating, providing secure locking and smooth release.
Two blanking caps are provided to cover unused holes in the inner door panel when the inward handle is not fitted. These Cab door latch caps are made from black ABS plastic and snap securely into place, providing a clean finish and preventing dust ingress.
The right outward opening pull rod connects the exterior door handle to the latch on the passenger side. This Cab door latch rod is identical in construction to the left version but formed for the right door, ensuring balanced operation.
This rod transfers the key cylinder rotation to the latch mechanism on the right door. The Cab door latch rod is made from steel with a protective coating, featuring the correct bend and length for the passenger side.
Six countersunk head Torx screws (ZQ2580612) are used to secure the lock assemblies and other flush‑mounted components of the Cab door latch. The countersunk heads ensure a flat surface finish, preventing snagging on clothing or interior trim.
Multiple pan head Torx screws (Q215B0616F31) are supplied in various quantities (6, 2, 6) to secure brackets, handles, and rods. These Cab door latch screws feature a large head for easy torque application and are made from corrosion‑resistant steel with a zinc plating.
Four additional countersunk head Torx screws (ZQ2580820) are used for heavier mounting points, such as the lock catch assembly. These larger screws provide extra strength for the Cab door latch components that bear the most load.
Four tapered teeth locking washers (Q41408) are used under the screw heads to prevent loosening due to vibration. These washers bite into the mating surface, ensuring that all Cab door latch fasteners remain tight over the life of the vehicle.
Six tapping screws with a hexagon flower pan head are supplied for securing trim panels and the blanking caps. These Cab door latch screws are self‑threading and designed for fast installation into plastic or sheet metal without pre‑drilling.
Cab door latch – genuine HOWO complete door lock and handle hardware kit for MAX 4X2
This Cab door latch kit includes every handle, rod, cable, lock, bracket, and fastener needed for a full door mechanism rebuild on both doors of the HOWO MAX 4X2. No extra parts required.
All Cab door latch components are made from corrosion‑resistant steel, zinc alloy, or UV‑stabilised plastics, ensuring reliable operation in extreme temperatures and high humidity.
The pull rods and stay wires in this Cab door latch kit are pre‑formed to the exact lengths and bends of the original HOWO parts, ensuring correct travel and smooth actuation.
This Cab door latch kit supplies every Torx screw, tapping screw, locking washer, and bolt required for installation. No need to reuse old, corroded hardware.
The Cab door latch system uses a combination of mechanical linkages to allow door opening from inside and outside, as well as key locking. From the inside, the driver pulls the inward opening handle, which pulls the stay wire connected to the door lock assembly’s release pawl, unlatching the door. From the outside, the exterior handle operates the outward opening pull rod,
which performs the same function. The key cylinder operates the lock core pull rod, which engages or disengages the lock mechanism to prevent the latch from being released. The door lock assembly itself contains the main latch bolt that catches the lock catch on the door frame. The blanking caps cover unused handle holes. All moving parts are designed for smooth operation with minimal play. Regular lubrication of the Cab door latch pivot points and rods is recommended to maintain smooth operation.
Before installation, remove the door trim panel and old components. Install the door lock assembly into the door cavity, securing it with the countersunk Torx screws. Attach the lock catch assembly to the door frame, adjust for proper alignment with the latch bolt. Install the inward opening handle and bracket on the inner panel,
connecting the stay wire to the lock. Install the outward opening handle on the exterior, connecting the pull rod. Install the lock core and connect the pull rod. Attach the blanking caps where needed. Finally, secure all fasteners with the supplied lock washers and tap screws. Test the operation of the Cab door latch from inside and outside, adjusting the rods and catch as needed. The Cab door latch is now ready for service.
If the door does not open from inside, the stay wire may be broken or disconnected; inspect the cable and its attachment to the handle and lock. If the door does not latch closed, the lock catch may be misaligned; adjust its position. A sticking exterior handle indicates a seized rod or pivot; lubricate with lithium grease. If the key cylinder does not turn, the lock core pull rod may be bent or the cylinder may be frozen; replace the cylinder. Loose handles often mean worn Torx screws; replace with new ones from the Cab door latch kit. Always use genuine components for reliable repair.
Inspect the Cab door latch system every 20,000 km. Check all handles for smooth operation and tighten any loose screws. Lubricate the lock mechanism, rods, and stay wire ends with a silicone spray or white lithium grease. Inspect the lock catch for wear and adjust alignment if necessary. Clean the key cylinder and lubricate with graphite powder. Replace any damaged blanking caps. A well‑maintained Cab door latch ensures easy entry and exit, and prevents lock‑outs or door opening while driving.
This Cab door latch kit is designed for the HOWO MAX 4X2 tractor cab and is compatible with all production years from 2018 onward. The NJ20 designation indicates compatibility with the latest door panel design. The kit includes both left and right door components. It is also suitable for SITRAK C7H and HOWO T7H models that share the same door architecture. It is not compatible with older A7 or WD615 models, which have different handle designs and rod lengths. Always verify your vehicle’s door panel type before ordering.
Aftermarket Cab door latch components often use softer metals and plastics that wear quickly, causing handles to become loose and locks to malfunction. Generic rods may not be the correct length, requiring bending that weakens them. Non‑genuine fasteners can strip or corrode, leading to component detachment.
Genuine HOWO Cab door latch components are manufactured to SINOTRUK’s exacting standards, using hardened steel, zinc‑alloy castings, and UV‑stabilised plastics. The small additional cost of a genuine kit ensures that the doors open and close reliably, which is essential for driver safety and cargo security.
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