The Chassis frame assembly for the HOWO MAX 4X2 tractor is the essential structural foundation that supports the entire vehicle, including the engine, transmission, cab, suspension, and payload. This comprehensive Chassis frame assembly kit includes the frame connection plate, crossbeam connecting plate, cross beam assembly, frame beam assembly, saddle connecting plates, limit brackets, backing plates, connecting plates,
and an integral tail beam – all precision‑engineered for optimal strength and durability. When you choose authentic Howo Parts, this Chassis frame assembly guarantees OE fitment, superior structural integrity, and long‑term reliability. Below are detailed descriptions of every component included with this Chassis frame assembly.
The frame connection plate is a high‑strength steel bracket that joins two sections of the chassis side rail, ensuring continuity of the frame structure. This Chassis frame assembly component is laser‑cut and precision‑formed to match the original SINOTRUK dimensions, featuring pre‑drilled bolt holes for secure attachment. The plate is made from 8mm thick HSLA steel with a yield strength of 600 MPa, providing exceptional resistance to shear and tensile loads.
The frame crossbeam connecting plate is used to attach crossmembers to the side rails, distributing loads across the width of the Chassis frame assembly. This component features multiple mounting holes to accommodate various crossmember positions and is reinforced with a gusset for added rigidity. It is coated with an e‑coat primer for corrosion protection.
The cross beam assembly is a complete transverse structural member that spans the width of the Chassis frame assembly, connecting the left and right side rails. It consists of a fabricated steel beam with integrated gussets and mounting points for suspension components, fuel tanks, and other chassis systems. This assembly is essential for maintaining frame squareness and resisting torsional forces.
The frame beam assembly is the main longitudinal side rail that runs the full length of the vehicle. This Chassis frame assembly component is formed from a single piece of high‑strength steel with a C‑channel cross‑section, providing the primary load‑bearing structure for the entire truck. It includes integrated mounting holes for all major components.
The left connecting plate of saddle is a specialised bracket that attaches the fifth‑wheel saddle to the left side of the Chassis frame assembly. It is fabricated from thick steel plate with a reinforced flange to distribute the high loads imposed by the trailer coupling. This plate ensures a secure, stable mounting for the saddle.
The right connecting plate of saddle is the mirror‑image counterpart for the right side of the Chassis frame assembly. Together with the left plate, it provides a balanced mounting system for the fifth‑wheel saddle, ensuring even load distribution across the frame rails. Both plates are identical in strength and construction.
Two limit brackets are supplied to restrict the movement of suspension components or to act as travel stops for the axle assembly. These Chassis frame assembly brackets are made from stamped steel with a rubber bumper insert to absorb impact, protecting the frame from excessive stress during articulation.
Two backing plates are provided to reinforce the frame at high‑stress mounting points, such as suspension brackets or fifth‑wheel attachment locations. These plates distribute concentrated loads over a larger area of the Chassis frame assembly, preventing localised deformation and fatigue cracking.
The left connecting plate is a general‑purpose bracket used to attach various components to the left side of the Chassis frame assembly. It is made from 10mm steel and features multiple slotted holes to allow for adjustment during installation, ensuring precise alignment of auxiliaries.
The right connecting plate is the symmetrical counterpart for the right side of the Chassis frame assembly. It provides identical mounting capabilities, allowing symmetrical installation of components such as air tanks, battery boxes, or exhaust systems.
The integral tail beam is a robust crossmember that closes the rear of the Chassis frame assembly and supports the towing pintle hook, rear bumper, and lighting brackets. This component is formed from a single piece of high‑strength steel with integrated mounting points, providing a solid termination for the frame rails.
Chassis frame assembly – genuine HOWO structural frame and reinforcement kit for MAX 4X2
This Chassis frame assembly includes every plate, bracket, beam, and connector needed to rebuild or reinforce the frame structure. No additional parts are required for a full chassis structural overhaul.
All components of this Chassis frame assembly are fabricated from high‑strength low‑alloy steel with a yield strength of 600 MPa, providing exceptional resistance to bending, fatigue, and impact loads.
Each component is laser‑cut and formed to the exact SINOTRUK dimensions, guaranteeing that every bolt hole and flange aligns perfectly with the original frame, ensuring a straightforward installation without modification.
All steel parts in this Chassis frame assembly receive an electro‑coat primer that penetrates into crevices and resists rust, extending the life of the chassis even in harsh, salt‑spray environments.
The Chassis frame assembly is a modular system of interlocking steel components that together form a rigid ladder‑type chassis. The two main frame beam assemblies run the full length of the vehicle and provide the primary load‑bearing members. Cross beam assemblies connect the side rails at intervals, maintaining the correct frame width and resisting torsional deflection.
The frame connection plates and crossbeam connecting plates reinforce joints where sections join, distributing loads across a larger area. The saddle connecting plates provide the mounting interface for the fifth‑wheel, which carries the trailer load. Limit brackets control suspension travel, while backing plates reinforce high‑stress mounting points.
The integral tail beam provides a strong, finished rear structure for towing equipment. All components are designed to work together as a unified structure that supports the engine, cab, and payload while absorbing road shocks and maintaining vehicle stability. A properly assembled Chassis frame assembly ensures that the vehicle tracks straight, handles predictably, and provides a safe platform for all other systems.
Every component of this Chassis frame assembly is manufactured using state‑of‑the‑art CNC laser cutting and press‑brake forming, ensuring dimensional accuracy to within ±0.5mm. The steel used is sourced from certified mills and meets the requirements of SINOTRUK material specification Q/SQ 1001‑2015.
All welds are performed by robotic systems to guarantee consistent penetration and strength. After forming, each part is cleaned and phosphate‑treated before receiving a 25‑micron e‑coat primer, which is baked at 200°C to form a durable, corrosion‑resistant layer.
Every batch of components is sample‑tested for hardness, tensile strength, and coating thickness. The result is a Chassis frame assembly that matches or exceeds the original factory quality, providing peace of mind for fleet operators and owner‑operators alike.
Installing this Chassis frame assembly kit requires a well‑equipped workshop with proper lifting equipment and frame alignment jigs. The old frame components must be removed and the new parts assembled on a flat, level surface. All bolts should be torqued to the manufacturer’s specified values (typically 300‑400 Nm for main frame fasteners).
It is essential to follow the correct assembly sequence, starting with the main side rails, then adding crossmembers and reinforcing plates, and finally installing the saddle plates and tail beam. After assembly, the entire Chassis frame assembly should be checked for squareness and alignment before the vehicle components are reinstalled.
This Chassis frame assembly is supplied with all necessary mounting holes pre‑drilled, but some fitment adjustments may be required using the slotted holes provided. For safety, frame work should only be performed by qualified technicians with experience in heavy‑duty chassis repair.
Common problems with the Chassis frame assembly include loose fasteners, corrosion, and fatigue cracking. Loose bolts should be retorqued to specification; if bolts are stripped, they must be replaced with genuine HOWO fasteners.
Corrosion is best prevented by regular cleaning and application of rust‑proofing compounds. Cracks are often found near high‑stress areas such as suspension brackets and fifth‑wheel mounting plates. If a crack is detected, it may be repaired by welding, but the repair must be performed by a certified welder using low‑hydrogen electrodes and proper pre‑heating.
If the frame is bent or extensively damaged, replacement of the entire Chassis frame assembly is recommended. Regular inspection of the frame, especially after heavy use or an accident, is essential to maintaining vehicle safety. Use only genuine HOWO Chassis frame assembly parts for replacement to ensure correct strength and fitment.
The Chassis frame assembly does not require routine maintenance beyond periodic inspection. At every 100,000 km or annual service, visually inspect the frame for cracks, rust, and loose fasteners.
Pay particular attention to the area around the fifth‑wheel saddle and the suspension attachment points. If the vehicle is used in corrosive environments, consider washing the underbody regularly and applying a wax‑based rust inhibitor.
Any loose bolts should be retorqued. If damage is found, it should be repaired promptly. A well‑maintained Chassis frame assembly will last the life of the vehicle, but replacement may be necessary after extreme overloading or an accident. Keeping a maintenance log of inspections and repairs is recommended for fleet operations.
This Chassis frame assembly 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, as well as all transmission and suspension options offered for this model. The components are also suitable for SITRAK C7H and HOWO T7H models that share the same chassis architecture. This kit is not compatible with older A7 or WD615 models, which have different frame widths and mounting hole patterns. Always verify your vehicle’s chassis number and model year before ordering the Chassis frame assembly.
Aftermarket Chassis frame assembly components are often made from lower‑grade steel that does not meet the original strength requirements. This can lead to premature cracking, loss of alignment, and catastrophic frame failure. Generic plates and brackets may have incorrect hole spacing, requiring modifications that weaken the structure. Genuine HOWO Chassis frame assembly components are manufactured to SINOTRUK’s exacting standards, using certified materials and precision tooling.
The small additional cost of a genuine frame kit is insignificant compared to the safety risk of a chassis failure, which could result in loss of vehicle control, injury, or death. For fleet operators, using genuine parts ensures consistency across the fleet and maintains the vehicle’s resale value. Trust in the quality and integrity of a genuine HOWO Chassis frame assembly to keep your MAX 4X2 safe and reliable for years to come.
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