Core Product Function
81.35199.6554 Middle Reducer Bevel Gear Set is a high-precision middle reducer bevel gear set exclusively for heavy-duty trucks, serving as the core transmission component of the vehicle middle axle reducer. It is mainly responsible for changing the direction of power transmission, reducing the rotational speed of the drive shaft, increasing torque, and stably transmitting the engine power to the wheels. This gear set ensures smooth power output, improves transmission efficiency, enhances the load-bearing capacity of the middle axle, and adapts to harsh working conditions such as heavy-load transportation, mountain climbing, and long-distance operation of heavy-duty trucks.
Adaptability and Compatibility
Applicable Vehicles: Mainstream heavy-duty truck models (compatible with MAN, SHACMAN and other brands' middle axle reducer assemblies)
Adaptable Systems: Original factory middle axle reducer system, matching with differential assembly and drive shaft
OE Reference Number: 81.35199.6554
Interchangeability: Direct replacement of original factory parts, precise matching of tooth profile and installation dimensions, no additional modification of the reducer housing or transmission structure
Value-added Service: Support vehicle configuration verification based on VIN code and reducer model, ensuring 100% compatibility.
Key Technical Parameters
Main Dimensions: Gear modulus 12, number of teeth (drive gear: 15, driven gear: 43), pitch circle diameter (drive gear: 180mm, driven gear: 516mm), overall thickness 120±0.5mm
Material Specification: 20CrMnTi alloy steel (gear blank), surface carburized and quenched, hardness HRC 58-62
Rated Torque: ≥ 2800N·m (adapt to heavy-load power transmission needs)
Transmission Efficiency: ≥ 98% (low power loss, improved fuel economy)
Operating Temperature: -40℃~150℃ (adapt to extreme temperature changes of the reducer)
Tooth Profile Accuracy: Grade 6 (GB/T 10095), low noise and stable transmission
Runout Tolerance: ≤ 0.02mm (ensures precise meshing of gears)
Materials and Processes
Core Materials: 20CrMnTi alloy steel (high strength, good toughness and wear resistance), molybdenum disulfide lubricating coating (reduces meshing friction)
Surface Treatment: Carburizing and quenching (enhances surface hardness and wear resistance), shot peening (eliminates residual stress, improves fatigue life), precision grinding (ensures tooth profile accuracy)
Production Process: Precision forging (gear blank), CNC gear hobbing, gear shaping, carburizing and quenching heat treatment, precision grinding, gear meshing test, dynamic balance calibration, 100% performance inspection before leaving the factory
Production Line Capacity: Equipped with imported gear processing equipment and automated production lines, monthly output ≥ 4000 sets
Quality Grade and Inspection
Quality Grade: High-precision aftermarket parts, fully compliant with original factory technical standards and ISO 6336 gear quality standards
Inspection Items: Tooth profile accuracy test, hardness test, wear resistance test, torque bearing test, noise test, heat treatment quality inspection, dimensional accuracy calibration
Quality System: IATF16949, ISO9001 certified, strict quality control throughout the production process
Batch Tracking: Support full batch traceability, each gear set is marked with batch number, production date and OE number, and complete production and inspection records are retained
Service Life and Performance
Average Service Life: ≥ 10 years (or 800,000 kilometers) under normal working conditions and regular maintenance
Performance Improvement: 20CrMnTi alloy steel with carburizing and quenching treatment, high hardness and wear resistance; grade 6 tooth profile accuracy, low meshing noise (≤ 75dB) and stable transmission; optimized tooth surface design, uniform force distribution, strong torque bearing capacity
Harsh Environment Adaptation: Adaptable to extreme low temperature in northern regions (-40℃) and high-temperature operation of the reducer (150℃); resistant to impact and vibration under mountain road and construction site conditions; no tooth breakage, pitting or wear under long-term heavy-load operation
Fault Improvement and Replacement Value
Common Fault Improvement: Solves the problems of tooth surface wear, pitting, gluing, tooth breakage and excessive meshing noise of the original bevel gear set caused by insufficient hardness and low precision
Maintenance Value: Direct replacement without modifying the reducer assembly, reducing maintenance time by 40%; long service life reduces replacement frequency and maintenance costs; high transmission efficiency reduces fuel consumption and improves vehicle operation efficiency
Packaging and Marking
Packaging Configuration: EPE anti-collision foam + vacuum packaging (anti-rust) + hard carton + wooden pallet (for bulk goods), effectively preventing collision damage and rust during transportation
Outer Carton Marking: OE number, vehicle model, product name (middle reducer bevel gear set), quantity, batch number, gross weight, net weight, production date, anti-rust and anti-collision warning signs
Product Marking: Laser marking of OE number, material specification, tooth parameter, batch number and production date on the gear end face
Customization Service: Support neutral packaging or customized packaging with customer brand logo; support customized tooth parameters and material specifications for special reducer models
Supply Capacity
Inventory Status: In-stock supply for mainstream heavy-duty truck models
Minimum Order Quantity (MOQ): 2 sets
Delivery Cycle: 3 days for spot goods; 12-20 days for bulk customized orders (depending on processing difficulty)
Supply Stability: Monthly output ≥ 4000 sets, stable supply of raw materials and mature production process, no delivery delay due to production capacity; sufficient inventory reserve for emergency orders
Certification and After-sales Guarantee
Certification Qualifications: IATF16949, ISO9001 certified; compliant with ISO 6336 gear quality standards; can provide third-party test reports (hardness, accuracy, torque bearing capacity)
Quality Guarantee Policy: 36-month warranty, 7-day free replacement and return for non-human damage (such as tooth pitting, wear without improper use)
Technical Support: 24-hour online technical response, providing installation guidance, gear meshing adjustment methods and fault diagnosis solutions
Return and Exchange Policy: Accept return and replacement for non-human damage, freight borne by the supplier; provide fast replenishment service for defective products to minimize customer losses
Scenario Cases
Northern China: Applied to heavy-duty trucks operating in -35℃ low-temperature areas, withstood long-term cold start and low-temperature operation, no gear jamming or wear, service life exceeding 850,000 kilometers
Southwest China: Used in mountainous areas with frequent climbing and heavy loads, strong torque bearing capacity, no tooth breakage or pitting, stable transmission efficiency, and won high recognition from logistics companies
Southeast Asia: Adapted to high-temperature and humid climate, vacuum packaging and anti-rust treatment effectively prevent rust, and the gear set remains in good condition after 6 years of use, with stable meshing performance
Maintenance and Precautions
Installation: Clean the mounting surface of the reducer and the gear meshing area before installation; apply special gear oil to the tooth surface; ensure precise alignment during installation, and check the meshing clearance (standard clearance: 0.15-0.25mm); tighten the fixing bolts according to the specified torque (35-40N·m).
Inspection: Check the gear meshing noise, oil leakage and oil level every 100,000 kilometers; check the tooth surface for wear, pitting or gluing, and replace the gear oil in time if metal debris is found in the oil.
Storage: Store in a dry and ventilated warehouse, avoid contact with water, oil and corrosive substances; place the gear set horizontally, and do not stack heavy objects to prevent deformation; keep the vacuum packaging intact to avoid rust.
Replacement: Replace the gear set in time when there are phenomena such as excessive meshing noise, gear jamming, tooth surface damage, reduced vehicle power or abnormal oil temperature rise of the reducer.
Frequently Asked Questions (FAQ)
Q1: How to ensure that the gear set matches my vehicle's middle reducer?
A1: You can provide the vehicle VIN code or reducer model, and we will verify the compatibility of the gear set with your equipment to ensure precise matching of tooth parameters and installation dimensions.
Q2: What is the material and heat treatment process of the gear set, and how is the wear resistance?
A2: The gear set is made of 20CrMnTi alloy steel, processed by carburizing and quenching, with surface hardness up to HRC 58-62, which has excellent wear resistance and fatigue life, and can adapt to heavy-load operation.
Q3: Can samples be provided for performance testing?
A3: Yes, sample supply is supported. The sample fee can be fully deducted from the subsequent formal order, and the sample delivery cycle is 3-5 days.
Q4: What maintenance methods are recommended for the gear set?
A4: It is recommended to use special gear oil for heavy-duty trucks, replace the oil regularly according to the vehicle maintenance manual, and check the gear meshing and oil level regularly to avoid insufficient lubrication leading to gear damage.
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