Heavy Duty JAC Main and Auxiliary Leaf Spring Assembly
Looking for a premium performance JAC Main and Auxiliary Leaf Spring Assembly for JAC heavy-duty trucks, dumpers, and commercial logistics vehicles? Precision-engineered with an integrated main and helper (auxiliary) spring design, our leaf spring assembly provides maximum load-bearing capacity, superior shock absorption, and long fatigue service life under severe hauling conditions. Certified under strict ISO/TS 16949 quality systems with CE compliance, SGS，this combined leaf spring guarantees exceptional frame stability and axle alignment.
Product Overview
The JAC Main and Auxiliary Leaf Spring Assembly is a heavy-duty suspension solution engineered specifically for JAC commercial vehicle platforms. Featuring an integrated main-and-auxiliary (dual-stage) stacked design, the main spring handles smooth ride performance during light loads, while the auxiliary spring kicks in under heavy payloads to prevent axle sag, chassis flex, and frame strain.
Forged from high-tensile alloy spring steel, this combined multi-leaf spring efficiently absorbs harsh road impacts in construction sites, mining logistics, regional freight, and long-haul transport. We supply exact-fit aftermarket replacement leaf springs for JAC trucks as well as customized suspension solutions built strictly according to CAD drawings or physical samples.
Applicable Models
Key Features & Product Highlights
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Integrated Main & Auxiliary Design: Combines main and helper leaf springs into a single assembly for progressive load support under both light and extreme heavy-duty conditions.
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Direct Fitting for JAC Trucks: Precision-manufactured to match original factory dimensions and mounting geometry for JAC commercial trucks and dumpers.
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Premium Alloy Steel Construction: Forged from high-tensile alloy spring steel (60Si2Mn / 51CrV4 / SUP9) for maximum impact strength and fatigue resistance.
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Advanced Thermal Treatment & Shot Peening: Computer-controlled quenching, tempering, and high-stress shot peening ensure long fatigue life and consistent elasticity for every JAC Main and Auxiliary Leaf Spring Assembly.
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Superior Anti-Corrosion Finish: Finished with high-durability black electrophoretic coating (E-coating) or anti-rust paint to resist weather, road salt, mud, and chemicals.
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Flexible Customization Support: Full support for custom leaf thickness combinations, width, arch height, layer counts, and specialized surface treatments.
Technical Specifications
| Item | Specification |
| Product Name | Heavy Duty JAC Main and Auxiliary Integrated Leaf Spring Assembly |
| Primary Keyword | JAC Main and Auxiliary Leaf Spring Assembly |
| Compatible Truck Brand | JAC Commercial Trucks / Dumpers |
| Suspension Structure | Integrated Main & Auxiliary (Dual-Stage) Multi-Leaf Spring Assembly |
| Material Grade | Premium Alloy Spring Steel (60Si2Mn / 51CrV4 / SUP9) |
| Manufacturing Process | Shearing, Hole Punching, Heat Treatment, Shot Peening, Bushing Pressing, E-Coating, Assembly |
| Surface Finish | High-Durability Black Electrophoretic Coating (E-Coating) / Anti-Rust Paint |
| Quality Certification | ISO/TS 16949 Certified, CE Certified, SGS |
Vehicle Application & Compatibility
This JAC Main and Auxiliary Leaf Spring Assembly is widely applicable for various JAC commercial vehicle platforms operating across Southeast Asia, Africa, South America, and the Middle East:
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JAC Heavy Trucks & Construction Dumpers: Compatible with JAC Gallop (格尔发), JAC N-Series heavy trucks, and specialized engineering tippers.
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JAC Light & Medium-Duty Trucks: Suitable for heavy-load light trucks, cargo haulers, and regional logistics vehicles.
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Severe Hauling Logistics: Ideal for mining transport, cargo freight, and construction materials transport under continuous full-load operations.
(To ensure exact fitment for your JAC truck fleet, please confirm your truck chassis model, VIN, or original spring dimensions with our engineering team prior to ordering.)
Common Signs Your JAC Leaf Spring Assembly Needs Replacement
Routine inspection of your commercial vehicle suspension prevents unexpected fleet downtime. Replace your JAC Main and Auxiliary Leaf Spring Assembly if you observe any of the following symptoms:
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Visible Rear-End Sagging: Vehicle leans to one side or sags significantly when fully loaded.
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Cracked or Broken Leaves: Fractures on either the main or auxiliary spring layers caused by fatigue or overload.
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Abnormal Vehicle Sway & Instability: Excessive body roll or swaying during cornering and heavy braking.
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Uneven Tire Wear: Misaligned truck axles caused by worn leaf spring center bolts or deformed arch height.
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Frequent Bottoming Out: Suspension hitting frame stops frequently over rough or unpaved road surfaces.
Technical Inspection & Quality Control
Every JAC Main and Auxiliary Leaf Spring Assembly undergoes comprehensive quality inspections matching OEM standards:
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Dimensional & Arch Height Checks: Precise verification of total length, free arch height, center bolt position, and individual leaf thickness.
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Load Deflection & Stiffness Testing: Tested on hydraulic press machinery to verify stiffness under both main-only and main+auxiliary loading stages.
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Metallurgical & Hardness Testing: Metallographic testing confirms optimal heat treatment grain structure and uniform hardness across all leaves.
Manufacturing Process
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Raw Material Inspection: High-tensile alloy steel bars undergo chemical composition and tensile strength verification.
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Cutting & Machining: Precision shearing, end tapering, eye rolling, and CNC hole punching.
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Quenching, Tempering & Shot Peening: Computerized thermal treatment maximizes toughness, followed by shot peening to prevent fatigue stress cracks.
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Coating & Assembly: Main and auxiliary leaves receive a protective black E-coating before assembly with center bolts, clips, and heavy-duty bushings.
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Final Inspection & Packaging: 100% visual, dimensional, and load-test inspection prior to export packaging.
Packaging & Export Shipping
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Anti-Rust Protection: Treated with protective rust-inhibiting oil and wrapped in waterproof plastic film.
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Non-Fumigation Plywood Pallets: Securely bundled on heavy-duty non-fumigation pallets ensuring smooth customs clearance worldwide.
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High-Tensile Steel Strapping: Bound tightly with heavy steel bands and protective edge guards to prevent displacement during ocean transport.
OEM & Custom Manufacturing Services
We provide complete OEM/ODM manufacturing for JAC truck parts distributors, transport fleet owners, and repair workshops:
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Custom main/auxiliary leaf thickness ratios, width, arch heights, and leaf counts.
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Private labeling, custom laser part marking (part numbers, brand logos), and customized export cartons.
Frequently Asked Questions (FAQ)
Q1: What is the advantage of a main and auxiliary integrated leaf spring?
A: The integrated main and auxiliary setup allows smooth suspension travel under light loads, while engaging the auxiliary leaves under heavy payloads to greatly increase load capacity and prevent rear-end sag.
Q2: Is this leaf spring suitable for JAC heavy-duty dump trucks?
A: Yes! Our JAC Main and Auxiliary Leaf Spring Assembly is specifically engineered to endure extreme shock loads in mining, construction, and dumper operations.
Q3: Can you produce JAC leaf springs based on samples or CAD drawings?
A: Absolutely. We manufacture custom leaf springs matching your exact CAD drawings, physical samples, or original technical parameters.
Request a Quote
Keep your JAC truck fleet running efficiently and safely under extreme payloads! Contact our technical sales team today to request a competitive price quote for our ISO/TS 16949 certified JAC Main and Auxiliary Leaf Spring Assembly!
