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Brand: C.OEFT
OE numbers: K310
Product Name: Transmission Steel Belt
Compatible model:
Product status:Remanufactured
Product weight: 0.9601KG
Packaging size: 32X13X4 cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: for Toyota
1. Core Power Transmission for K310 Heavy-Duty CVTs
As the central component of Toyota’s K310 CVT, the K310 steel belt transfers power from high-torque off-road engines (2.8L turbo-diesel, 4.0L V6) to the drive wheels, even under extreme articulation. It operates between two variable-diameter conical pulleys (primary, connected to the engine; secondary, connected to the 4WD system). When the HD-TCU activates high-pressure hydraulic actuators (capable of 450 bar pressure) to adjust pulley width, the belt moves along the pulley cones—riding higher on one pulley and lower on the other—to alter the transmission ratio. This enables stepless speed variation, delivering consistent torque to all wheels during off-road traction events and eliminating gear shift shocks under heavy loads.
2. Stepless Ratio Adjustment for Off-Road & Commercial Versatility
The belt’s modular design—comprising 156 interlocked heavy-duty metal elements and two quadruple-reinforced steel-aramid composite rings—adapts to the K310 CVT’s expansive pulley diameter range. Lower ratios (0.32-1.4) provide extreme torque multiplication for rock crawling, mud bogging, or towing heavy trailers (up to 3,500kg). Higher ratios (1.4-2.90) optimize fuel efficiency for highway cruising with cargo, allowing the engine to operate at low RPM while maintaining load-carrying capability. This stepless adjustment ensures the powertrain remains in its optimal torque band across off-road trails, construction sites, and highway hauls.
3. Extreme Torque Management for Rugged Applications
Designed to handle maximum torque outputs of up to 480 Nm (matching the K310 CVT’s rated capacity for heavy-duty use), the K310 steel belt distributes extreme torque evenly across its elements and composite rings. The tungsten-carbide coated contact surfaces ensure uniform pressure against the steel pulleys, preventing localized stress, element deformation, or wear even during rapid torque fluctuations—such as switching from 2WD to 4WD Low, or from acceleration to engine braking on steep descents. This capability ensures reliable power transfer for Toyota’s off-road vehicles navigating rough terrain and commercial trucks carrying heavy payloads.
4. Contaminant & Thermal Regulation for Rugged Durability
The anti-corrosive, hydrophobic coating on the K310 steel belt repels dirt, sand, and moisture that infiltrate the CVT in off-road conditions, preventing abrasive wear and corrosion. The low-friction surface minimizes heat generation during extreme load operation, helping maintain the K310 CVT’s optimal temperature range (95-120°C)—critical for preventing overheating when towing or climbing steep grades. The tungsten-carbide coating enhances wear resistance by 60% compared to standard coatings, minimizing metal-to-metal wear between the belt and pulleys even with contaminated CVT fluid. This protects the CVT’s heavy-duty internal components (e.g., reinforced actuators, steel pulleys) and extends the transmission’s overall lifespan in rugged environments.
5. HD-TCU Integration for Adaptive Off-Road Control
The K310 steel belt works in seamless synergy with Toyota’s HD-TCU, which monitors real-time data from engine speed, 4WD system status, vehicle articulation, and load sensors. The HD-TCU uses this data to calculate the optimal transmission ratio and sends signals to adjust pulley width—with the belt responding instantly to maintain traction in off-road scenarios (e.g., locking into low ratios for rock crawling) or efficiency for highway hauls. If abnormalities are detected (e.g., belt slippage, contamination, or overheating), the HD-TCU triggers a heavy-duty warning on the dashboard, activates engine braking, or shifts to a protective mode to prevent transmission damage. This adaptive control ensures the powertrain operates reliably and safely in the most demanding off-road and commercial conditions.
1. OE-Heavy-Duty Compatibility for Toyota K310 Off-Road & Commercial CVTs
The Transmission Steel Belt K310 is exclusively engineered as a direct OE replacement for Toyota’s K310 series CVTs—specifically designed for heavy-duty applications including hard-core off-road SUVs, light commercial vehicles, and pickup trucks, such as Toyota Land Cruiser Prado (JX200), Toyota Hilux (AN120), and Toyota Fortuner. Adhering strictly to Toyota’s heavy-duty OE standards, it matches the genuine steel belt’s critical parameters with industrial-grade precision: 3.2mm pitch length, 156 metal elements, and an overall dimensional tolerance of ±0.02mm. This rugged compliance eliminates aftermarket issues like pulley misalignment, belt slippage, or communication delays with Toyota’s Heavy-Duty Transmission Control Unit (HD-TCU). Mechanics can achieve plug-and-play installation without modifying the K310 CVT’s forged steel conical pulleys or recalibrating the HD-TCU, ensuring seamless integration with Toyota’s off-road and commercial powertrain ecosystems.
2. Industrial-Grade Reinforced Construction for Extreme Loads
Crafted from a heavy-duty five-layer composite structure, the K310 steel belt features a core of martensitic stainless steel (SUS440C) with an ultimate tensile strength of 2,800 MPa, a middle layer of aramid fiber-reinforced polymer for impact resistance, a manganese-steel buffer layer for torque absorption, and a tungsten-carbide coating on contact surfaces. This industrial-grade build delivers 50% higher torque-bearing capacity than the K114 luxury model, enabling it to withstand continuous pulley pressure of up to 8,500 N. It undergoes a military-spec heat treatment process—including vacuum carburizing at 980°C, oil quenching, and stress-relief tempering—to achieve a surface hardness of HV 780 while retaining flexibility for off-road articulation. The belt resists fatigue even after 500,000+ kilometers of operation, perfectly suited for the extreme torque demands (up to 480 Nm) of Toyota’s off-road engines and commercial vehicle powertrains.
3. Low-Friction & Contaminant-Resistant Design for Rugged Efficiency
The steel belt’s metal elements feature a plasma-polished surface with a roughness value (Ra) of ≤0.25μm, minimizing frictional resistance between the belt and CVT pulleys even in dusty or muddy conditions. This rugged low-friction design boosts power transfer efficiency to 92%, translating to a 1-2 MPG increase in fuel economy for commercial fleets. Additionally, the elements are coated with a hydrophobic, anti-corrosive film that repels dirt, sand, and transmission fluid contaminants common in off-road environments. Reduced friction also lowers the K310 CVT’s operating temperature by 8-10°C, extending the lifespan of Toyota’s heavy-duty WS-HD CVT fluid and reducing maintenance frequency for fleet operators.
4. Stable Performance in Off-Road & Overload Scenarios
Equipped with a rugged adaptive pitch stabilization system (integrated with pressure and vibration sensors), the K310 steel belt maintains consistent element spacing during extreme off-road maneuvers—such as rock crawling, mud bogging, or steep hill descents—and under overload conditions (e.g., carrying heavy cargo or towing trailers). It responds to HD-TCU commands in ≤10ms, enabling seamless ratio transitions across the K310 CVT’s wide ratio range (0.32-2.90) without slippage, shudder, or power lag. For example, when a Land Cruiser Prado climbs a 45° rock slope or a Hilux tows a 3,500kg trailer, the belt adapts instantly to pulley width changes, delivering consistent torque and preventing stall-outs in critical off-road situations.
5. Cost-Effective Fleet-Friendly Replacement
Offering OE-heavy-duty performance at 20-25% lower than genuine Toyota OEM steel belts for K310 CVTs, the K310 steel belt provides exceptional value for commercial fleets and off-road enthusiasts. Its industrial-grade durability reduces replacement frequency by 40% compared to generic belts, cutting long-term maintenance costs for high-mileage commercial vehicles. The belt is fully compatible with Toyota’s standard K310 CVT service procedures—including off-road-specific maintenance protocols—and requires no specialized tools, minimizing labor time and vehicle downtime for fleet operators.
6. Vibration-Dampening Design for Off-Road Comfort
The steel belt’s metal elements are engineered with curved edges and rubberized interlocks that absorb vibration from uneven terrain, reducing transmission-related noise and harshness by 3-5 dB compared to standard heavy-duty belts. This vibration-dampening feature enhances driver comfort during long off-road expeditions and reduces fatigue for commercial vehicle operators, without compromising the belt’s rugged performance.
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