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The foundation of a heavy-duty truck’s durability and load-bearing capability lies in its suspension system. For SANY trucks, this critical support is provided by the genuine SANY parts, specifically the Rear Steel Plate Spring Assembly with OEM number 131699000040A. This robust assembly, commonly known as a leaf spring pack, is engineered to absorb road shocks, support immense static and dynamic loads, and maintain proper axle alignment. The OEM 131699000040A is manufactured from high-grade spring steel, utilizing a multi-leaf design that provides an optimal balance of strength, flexibility, and longevity.
Rear Steel Plate Spring Assy.
Рессорный комплект задний
Conjunto de Ballesta Trasera
The SANY Rear Steel Plate Spring Assembly, identified by OEM number 131699000040A, is a masterpiece of traditional and proven suspension engineering. It is built to deliver unmatched durability, load management, and reliable performance over millions of cycles.
The assembly consists of multiple graduated leaves of spring steel. This design provides a progressive spring rate—softer for unloaded comfort and increasingly stiffer as load increases—ensuring optimal support and stability across all load conditions.
Each leaf undergoes precise heat treatment for core toughness and shot peening to induce beneficial compressive stresses on the surface. This process dramatically increases fatigue life and resistance to crack initiation.
A high-tensile center bolt securely clamps all leaves together, maintaining alignment. Strategic placement of graphite or plastic anti-friction pads between leaves reduces inter-leaf friction, minimizing wear and noise while allowing smooth articulation.
These features ensure the SANY Rear Leaf Spring Assembly OEM 131699000040A provides consistent, maintenance-free service. It is engineered not just to carry weight, but to manage the dynamic stresses of stopping, starting, and cornering while protecting the chassis and cargo.
The table below details the key technical specifications for the SANY Rear Steel Plate Spring Assembly. These parameters define its load capacity, dimensions, and compatibility.
This specification table highlights the engineered capacity of the SANY OEM 131699000040A. Always verify these details against your vehicle’s axle rating and chassis configuration.
The Rear Steel Plate Spring Assembly (OEM 131699000040A) performs several critical, interconnected functions within the vehicle’s suspension and chassis system. Its role extends far beyond simply holding the truck up.
The spring pack’s primary function is to support the vehicle’s curb weight plus the entire payload. It must also manage dynamic loads from acceleration, braking, and cornering forces, preventing axle hop and maintaining tire contact with the road.
As the wheels hit bumps and potholes, the leaves flex to absorb and dissipate kinetic energy. This protects the chassis frame, cargo, and onboard systems from damaging shock loads and provides a more stable ride for the driver.
The spring assembly, in conjunction with shackles and hangers, plays a key role in locating the rear axle. It controls fore-aft and lateral movement, contributing to proper wheel alignment, driveline angles, and overall vehicle tracking stability.
A correctly specified and healthy leaf spring assembly is therefore fundamental to vehicle safety, handling, and component life. The OEM 131699000040A is designed to fulfill all these roles in harmony with the specific SANY truck model.
Proper installation and regular inspection of the SANY Rear Leaf Spring Assembly (OEM 131699000040A) are crucial for safety and performance. Due to the high forces involved, professional installation is strongly recommended.
Ignoring spring maintenance can lead to catastrophic failure, axle misalignment, and dangerous handling. At the first sign of a broken leaf or significant sag, replace the assembly with a genuine SANY part like the OEM 131699000040A.
The SANY Rear Steel Plate Spring Assembly OEM 131699000040A delivers essential performance, durability, and economic advantages for operators in the most demanding sectors.
The heat-treated and shot-peened spring steel is engineered to withstand the constant flexing and high-stress loads of construction sites, mines, and quarries. This results in a longer service life compared to non-genuine alternatives.
The progressive rate design maintains stability whether the truck is empty or fully laden. This minimizes body roll and pitch, protecting the load and giving the driver confidence, especially on uneven terrain.
This assembly is critical for SANY off-highway dump trucks, concrete mixer trucks, and heavy haulers used in construction, mining, logging, and infrastructure projects where extreme payloads and rough ground are the norm.
The SANY Rear Leaf Spring Assembly is therefore a fundamental investment in vehicle capability and uptime. The genuine part number 131699000040A is designed with the precise spring rate, arch, and load capacity for its intended vehicle. Using an incorrect or substandard spring pack can lead to overloading, poor handling, premature wear on tires and driveline components, and even chassis frame damage.
Economically, the benefits are clear. A durable, correctly rated spring assembly prevents costly roadside failures and secondary damage. It maximizes vehicle utilization by reliably supporting rated payloads. For fleet managers, standardizing on genuine SANY parts like the 131699000040A simplifies maintenance planning and ensures consistent performance across the fleet, contributing to a lower total cost of ownership.
The SANY Rear Steel Plate Spring Assembly with OEM number 131699000040A is the proven, reliable backbone of your truck’s rear suspension. It embodies the strength and durability required to support profitable operations in the toughest environments.
Always choose genuine SANY parts like the 131699000040A to maintain the designed load capacity, ride characteristics, and safety margins of your vehicle. This component is built to last, providing a solid foundation for thousands of hours of productive work. For all your genuine SANY suspension and chassis component needs, explore our comprehensive parts catalog.
In the world of heavy machinery, performance is built from the ground up. The OEM 131699000040A Rear Leaf Spring Assembly is a critical part of that foundation, ensuring your SANY truck is always ready to carry the load.
The SANY Rear Steel Plate Spring Assembly, part number 131699000040A, is a classic example of applied mechanical engineering. Its function is based on the principle of a simply supported beam under load. Each leaf acts as a beam, with the axle seat acting as the point load and the spring eyes providing the supports. The multi-leaf design effectively creates a beam of variable cross-section, which is more efficient in distributing stress than a single thick leaf.
The material science behind the spring steel is crucial. Alloy steels like 50CrV4 (50 Chromium Vanadium) are favored for their excellent combination of high tensile strength, good toughness, and superior fatigue resistance. The vanadium addition enhances grain structure stability during heat treatment. The manufacturing process involves rolling the steel to precise tapered profiles, cutting to length, punching center and eye holes, and then the critical heat treatment cycle: austenitizing, quenching, and tempering.
Shot peening is a vital secondary operation. Small spherical media are blasted at the leaf surfaces at high velocity. This cold-works the surface layer, creating compressive residual stresses. Since fatigue cracks initiate in tension, this compressive layer makes it much harder for cracks to start and propagate, potentially tripling the fatigue life of the component.
The assembly’s progressive rate is a result of the interaction between leaves. Initially, only the longest (main) leaf and perhaps the second leaf carry the load. As deflection increases, shorter leaves gradually come into contact, effectively increasing the thickness and thus the spring rate of the entire pack. This provides a comfortable empty ride and a firm, supportive loaded ride.
Proper bushing design in the spring eyes is also key to performance and noise. Rubber bushings provide isolation from road noise and vibration. Their compliance also allows for slight misalignment during articulation. The design must balance durability with enough flexibility to prevent binding, which can lead to premature bushing failure or spring breakage.
This technical deep dive confirms that the SANY OEM 131699000040A is a highly engineered component where material selection, precise manufacturing, and thoughtful design converge. Its simplicity is deceptive; a well-designed leaf spring pack is a sophisticated solution to the complex problem of managing variable loads in a harsh, dynamic environment. Compromising on its quality directly compromises the vehicle’s fundamental capability and safety.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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