Heavy Duty SINOTRUK Bogie Leaf Spring
Searching for heavy-capacity SINOTRUK Bogie Leaf Spring assemblies to supply HOWO dump trucks, mining tippers, or commercial spare parts inventory? Engineered with premium high-tensile alloy spring steel, multi-layer stacked leaf architecture, and high-precision heat treatment, our bogie suspension springs deliver maximum load distribution, extreme dynamic shock resistance, and long-term flexural fatigue life under demanding mining and construction haulage conditions. Certified under strict ISO/TS 16949 quality management standards and European CE compliance, Haishuo is a direct OEM factory manufacturer supplying truck fleet operators, assembly factories, and commercial spare parts distributors worldwide.
Product Overview
A SINOTRUK Bogie Leaf Spring is a central heavy-load suspension component designed for SINOTRUK multi-axle commercial vehicles (6×4 and 8×4 configurations). Mounted pivotally on the center trunnion axle seat between the middle and rear drive axles, the bogie equalizer spring evenly distributes massive vertical payloads across both axles while enabling smooth axle articulation across rough, unpaved terrain.
Featuring eye-less flat slipper ends and a high-thickness multi-leaf stack, every SINOTRUK Bogie Leaf Spring manufactured by Haishuo undergoes computerized thermal processing, precision CNC forming, and high-stress shot peening to prevent fatigue micro-fractures, leaf separation, and premature metal sagging. Built to withstand the harsh mining roads of Southeast Asia, Africa, South America, and the Middle East, our springs maintain optimum structural balance. We provide direct wholesale bulk manufacturing as well as 100% custom fabrication engineered strictly according to client CAD drawings, OEM reference numbers, or physical sample dimensions.
Applicable Models
Key Features & Product Highlights
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Perfect Fit for SINOTRUK Vehicles: Precision-machined dimensions matching exact OEM trunnion seat profiles for SINOTRUK HOWO, HOWO A7, TX, NX, and HOHAN truck series.
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Balanced Tandem Weight Distribution: Central balance architecture equalizes heavy freight weight across middle and rear drive axles, preventing individual axle overloading.
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Eye-Less Flat Slipper Ends: Smooth flat ends slide freely against axle trunnion brackets, accommodating extreme suspension flex over off-road mining terrain.
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High-Tensile Forged Alloy Steel: Manufactured from premium alloy spring steel (60Si2Mn / 51CrV4 / SUP9) for exceptional yield strength, impact toughness, and fracture resistance.
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Computerized Heat Treatment & Shot Peening: Advanced quenching, tempering, and surface shot peening eliminate surface micro-fissures to extend operational fatigue life for every SINOTRUK Bogie Leaf Spring.
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Anti-Corrosion E-Coating Finish: Protected with high-durability black/gray electrophoretic coating (E-coating) or heavy anti-rust primer to resist road moisture, mud, and salt spray.
Technical Specifications
| Item | Specification |
| Product Name | Heavy Duty SINOTRUK Bogie Leaf Spring |
| Primary Keyword | SINOTRUK Bogie Leaf Spring |
| Target Vehicle Brand | SINOTRUK (China National Heavy Duty Truck Group) |
| Suspension Type | Tandem Axle Rear Bogie Suspension / Central Trunnion Balance Assembly |
| End Configuration | Eye-less Plain Ends / Slipper Contact Surface |
| Material Grade | Premium Alloy Spring Steel (60Si2Mn / 51CrV4 / SUP9) |
| Manufacturing Process | CNC Cutting, Hot Form Shearing, Heat Treatment, Shot Peening, E-Coating |
| Surface Finish | Black/Gray Electrophoretic Coating (E-Coating) / Anti-Rust Industrial Paint |
| Quality Certification | ISO/TS 16949 Certified, CE Compliance, SGS Tested |
Dedicated Vehicle Application & Model Compatibility
Our SINOTRUK Bogie Leaf Spring series is specifically engineered for high-tonnage SINOTRUK dump trucks, tractor units, and heavy freight chassis:
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SINOTRUK Mining Dumpers: HOWO 70T Mining Dumper, HOWO 90T Heavy Duty Mining Truck (AZ9770520005, AZ9770520006, etc.)
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SINOTRUK HOWO Heavy Tippers (6×4 / 8×4): HOWO 336 / 371 / 380 / 420 Heavy Dump Trucks (AZ9725520268, WG9725520286, etc.)
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SINOTRUK HOWO A7 Series: HOWO A7 6×4 & 8×4 Rear Tandem Axle Suspension Packs
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SINOTRUK HOWO TX & NX Series: New Generation Heavy Duty Construction Tippers & Cargo Haulers
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SINOTRUK Sitrak & HOHAN: Heavy Duty Commercial Cargo & Tipper Platforms
(Because bogie spring leaf counts and arch dimensions vary depending on exact rear axle load ratings, please provide your SINOTRUK OEM part numbers or sample specs for instant technical verification.)
Common Signs Your SINOTRUK Bogie Spring Needs Replacement
Routine inspection of HOWO tandem bogie springs prevents severe frame twisting, axle misalignment, and costly downtime in quarry and mining operations. Replace your SINOTRUK Bogie Leaf Spring if you observe the following issues:
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Visible Leaf Fractures or Broken Blades: Cracks or snapped blades around the center pin clamping area caused by continuous heavy off-road shock impacts.
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Vehicle Leaning or Sagging Rear Axle: The dump truck sitting unlevel or lower than normal under load due to lost arch elasticity in the spring pack.
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Distorted Trunnion Slide Contact: Excessive grooving or severe surface wear on the plain slipper ends where the spring contacts the axle seat.
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Severe Metallic Clunking Noises: Heavy clunking sounds during off-road hauling caused by shifted leaves or loose central U-bolts.
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Accelerated Drive Axle Tire Wear: Rapid or uneven tread wear across middle and rear drive tires caused by unbalanced axle weight distribution.
Technical Inspection & Quality Control
Every SINOTRUK Bogie Leaf Spring undergoes strict multi-stage quality control checks to match original factory specs:
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3D Geometry & Arch Verification: Precision laser measurement of total span length, free arch height, leaf thickness, and center bolt alignment.
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High-Tonnage Hydraulic Load & Deflection Testing: Verified on dynamic hydraulic presses to guarantee precise spring rate and dynamic rebound under max payload capacity.
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Metallurgical & Hardness Analysis: Hardness testing verifies uniform heat treatment grain structure and dynamic tensile resilience.
Manufacturing Process
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Raw Steel Inspection: High-tensile alloy spring steel flat bars undergo chemical composition analysis and tensile strength testing.
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CNC Cutting & Punching: Precision shearing, end profiling, and center bolt hole punching.
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Quenching, Tempering & Shot Peening: Computerized thermal treatment maximizes structural toughness, followed by shot peening to prevent fatigue micro-cracks.
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Protective Coating & Assembly: Leaves receive a durable E-coating before precision assembly with heavy-duty center hardware.
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Final Inspection & Packaging: 100% visual, dimensional, and dynamic load-deflection checks prior to export shipping.
Packaging & Export Shipping
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Anti-Rust Protection: Treated with rust-inhibiting coating and wrapped in heavy moisture-proof plastic film.
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Non-Fumigation Plywood Pallets: Secured on heavy-duty non-fumigation export pallets for rapid customs clearance at destination ports.
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High-Tensile Steel Strapping: Bound firmly with heavy steel bands and protective corner guards to prevent shifting during ocean transit.
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Container Loading Optimization: Customized container space utilization plans to maximize loading capacity in 20ft and 40ft HQ containers.
OEM & Custom Wholesale Manufacturing Services
We provide comprehensive OEM/ODM production capabilities for spare parts importers, mining fleet managers, and SINOTRUK repair centers:
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Custom leaf counts, spring width, leaf thickness ratios, and free arch heights.
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Customized trunnion seat wear profiles, center pin dimensions, and surface finishes.
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Private labeling, laser OEM part number marking, and customized export cartons.
Frequently Asked Questions (FAQ)
Q1: Is this bogie leaf spring compatible with original SINOTRUK HOWO trucks?
A: Yes! Our SINOTRUK Bogie Leaf Spring packs are manufactured according to strict OEM dimensions and fit directly onto HOWO 70T/90T, HOWO A7, TX, and NX tandem axle suspension seats.
Q2: Can you manufacture SINOTRUK leaf springs based on OEM part numbers?
A: Absolutely. We can produce springs directly based on your SINOTRUK OEM part numbers (e.g., AZ9725520268, WG9725520286), CAD drawings, or physical samples.
Q3: What steel grades do you use for HOWO heavy-duty springs?
A: We use premium high-tensile alloy spring steels such as 60Si2Mn, 51CrV4, and SUP9 to guarantee high yield strength and flexural fatigue resistance under heavy mining conditions.
Q4: Do you supply sample units for fitment testing?
A: Yes, sample units are available for distributors and repair centers to verify dimensions, arch height, and load performance prior to placing bulk container orders.
Q5: What is the standard production lead time for bulk export orders?
A: Standard manufacturing lead time typically ranges from 15 to 25 days depending on total order volume, customized tooling needs, and surface finish choices.
Request a Quote
Keep your SINOTRUK HOWO fleet operating at peak performance with maximum suspension reliability! Contact our technical sales team today to request a competitive wholesale quote for our ISO/TS 16949 certified SINOTRUK Bogie Leaf Spring products!
