Heavy Duty HOWO  Leaf Spring WG9725520286

Searching for direct factory replacement HOWO  Leaf Spring WG9725520286 assemblies  to supply SINOTRUK fleets, mining dump trucks, or international commercial spare parts inventory? Engineered with premium high-tensile alloy spring steel, 12-leaf heavy-duty stacked architecture, and high-precision thermal processing, our bogie suspension springs deliver maximum load-sharing balance, high impact resistance, and extended fatigue life under extreme off-road transport conditions. Certified under strict ISO/TS 16949 quality management standards with European CE compliance, Haishuo is a direct OEM factory manufacturer supplying truck builders, fleet operators, and spare parts wholesalers globally.

Product Overview

The HOWO Bogie Leaf Spring WG9725520286 is a crucial rear suspension component designed specifically for heavy-tonnage SINOTRUK commercial trucks (6×4 and 8×4 configurations). Positioned centrally on the balance trunnion shaft between the middle and rear drive axles, this 12-leaf bogie spring pack distributes massive payload weight evenly across both axles while enabling smooth axle articulation over rugged mining and construction terrain.

Forged from high-tensile alloy spring steel, every HOWO  Leaf Spring WG9725520286 manufactured by Haishuo features eye-less flat slipper ends engineered to slide smoothly against heavy axle trunnion brackets. Each spring unit undergoes computerized quenching and tempering, precision center-hole punching, and high-stress shot peening to prevent metal sagging, leaf cracking, and structural failure under heavy dynamic shock. Built to withstand demanding haulage conditions across Southeast Asia, Africa, South America, and the Middle East, our springs match original factory specifications 100%. We offer direct wholesale bulk manufacturing as well as custom engineering based on client drawings or physical samples.Key Features & Product Highlights

Applicable Models

Key Features & Product Highlights

• Direct OEM Fitment (WG9725520286 ): Exact dimensional matching for original SINOTRUK HOWO rear trunnion axle seats and U-bolt clamps.

• 12-Leaf Reinforced Stack Design: High-density stacked leaf profile engineered to support extreme overload payloads without permanent arch deformation.

• Eye-Less Flat Slipper Ends: Smooth flat contact ends accommodate extreme axle movement over uneven mining roads while minimizing bracket friction wear.

• High-Tensile Forged Alloy Steel: Manufactured from premium alloy spring steel (60Si2Mn / 51CrV4 / SUP9) for maximum yield strength, impact toughness, and fracture resistance.

• Computerized Heat Treatment & Shot Peening: Advanced quenching, tempering, and surface shot peening eliminate surface micro-fissures to extend operational fatigue life.

• Anti-Corrosion Industrial Coating: Protected with high-durability gray/black electrophoretic coating (E-coating) or heavy anti-rust primer to resist mud, water, and salt spray.

Technical Specifications

Item	Specification
Product Name	Heavy Duty HOWO  Leaf Spring WG9725520286
Primary Keyword	HOWO  Leaf Spring WG9725520286
OEM Reference Numbers	WG9725520286 / AZ9725520286
Target Vehicle Brand	SINOTRUK (China National Heavy Duty Truck Group)
Suspension Type	12-Leaf Rear Tandem Bogie Suspension / 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 Shearing, Heat Treatment, Shot Peening, E-Coating
Surface Finish	Dark Gray / Black Electrophoretic Coating (E-Coating)
Quality Certification	ISO/TS 16949 Certified, CE Compliance, SGS Tested

Vehicle Application & OEM Compatibility

Our HOWO  Leaf Spring WG9725520286 is specifically engineered for high-tonnage SINOTRUK commercial trucks and heavy mining rigs:

• SINOTRUK HOWO 7 Series: HOWO 336, HOWO 371, HOWO 380, HOWO 420 Heavy Duty Dump Trucks (6×4 and 8×4 tipper chassis).

• SINOTRUK Mining Dumpers: HOWO 70T and 90T heavy mining trucks operating in open-pit quarries and earthmoving sites.

• SINOTRUK HOWO A7 Series: HOWO A7 heavy dumpers and heavy-haul freight transport rigs.

• SINOTRUK HOWO TX & NX Series: New generation heavy-duty construction tippers and cargo haulers.

• Cross-Reference OEM Part Numbers: WG9725520286, AZ9725520286, WG9725520285.

(Because bogie spring stack thicknesses can vary depending on regional payload ratings, please verify your exact OEM part numbers or physical sample specs with our technical sales team.)

Common Signs Your HOWO  Spring Needs Replacement

Routine inspection of HOWO rear tandem bogie springs prevents severe frame twisting, axle misalignment, and costly breakdown downtime in quarry and construction operations. Replace your HOWO Leaf Spring WG9725520286 if you observe the following issues:

• Visible Fractures or Snapped Center Leaves: Cracks appearing around the center pin clamping area caused by severe off-road shock loading.

• Vehicle Leaning or Sagging Rear Axles: The dump truck sitting unlevel or lower than normal under load due to lost arch height.

• Distorted Trunnion Slide Contact: Deep grooving or severe surface wear on the plain slipper ends where the spring contacts the axle seat.

• Severe Metallic Clunking Noises: Heavy metallic clunking sounds during rough terrain travel caused by loose center bolts or shifted leaves.

• Accelerated Drive Axle Tire Wear: Rapid or uneven tread wear across middle and rear drive tires caused by unbalanced load distribution.

Technical Inspection & Quality Control

Every HOWO  Leaf Spring WG9725520286 undergoes strict multi-stage quality control checks matching original factory standards:

• 3D Geometry & Arch Verification: Precision laser checking of total span length, free arch height, leaf thickness profile, and center pin positioning.

• High-Tonnage Hydraulic Load Testing: Verified on dynamic hydraulic presses to guarantee precise spring rate and dynamic recovery under max dynamic payload.

• Metallurgical & Hardness Analysis: Hardness testing verifies uniform heat treatment grain structure and dynamic tensile resilience across all 12 leaves.

Manufacturing Process

1. Raw Steel Inspection: High-tensile alloy spring steel flat bars undergo chemical composition analysis and tensile strength testing.

2. CNC Cutting & Punching: Precision shearing, end profiling, and center bolt hole punching.

3. Quenching, Tempering & Shot Peening: Computerized thermal treatment maximizes structural toughness, followed by shot peening to prevent fatigue micro-cracks.

4. Coating & Stack Assembly: Leaves receive a durable E-coating before precision assembly with heavy-duty center hardware.

5. Final Inspection & Packaging: 100% visual, dimensional, and dynamic load-deflection checks prior to export shipping.

Packaging & Export Shipping

• Anti-Rust Protection: Treated with rust-inhibiting coating and wrapped in heavy moisture-proof plastic film.

• Non-Fumigation Plywood Pallets: Secured on heavy-duty non-fumigation export pallets for rapid customs clearance at destination ports.

• High-Tensile Steel Strapping: Bound firmly with heavy steel bands and protective corner guards to guarantee zero shifting during ocean transit.

• Container Space Optimization: Customized packing 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:

• Direct OEM manufacturing matching part numbers WG9725520286 and AZ9725520286.

• Custom leaf counts, leaf thickness profile, arch height, and wear surface coatings.

• Private labeling, laser OEM part number engraving, and customized export cartons.

Frequently Asked Questions (FAQ)

Q1: Is WG9725520286 interchangeable with AZ9725520286?

A: Yes! WG9725520286 and AZ9725520286 represent the exact same 12-leaf heavy-duty rear bogie spring specification for SINOTRUK HOWO trucks.

Q2: How many leaves are in the WG9725520286 spring assembly?

A: Standard OEM specification for WG9725520286 features a 12-leaf stacked profile designed for heavy-duty dump trucks and mining haulers.

Q3: What steel grades do you use for HOWO heavy bogie springs?

A: We use premium high-tensile alloy spring steels such as 60Si2Mn, 51CrV4, and SUP9 to guarantee maximum yield strength and fatigue resistance.

Q4: Do you supply sample units for fitment testing?

A: Yes, sample units are available for distributors and fleet owners to verify dimensions, arch height, and trunnion fitment 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 dump trucks and mining fleets operating with maximum load capacity! Contact our technical sales team today to request a competitive wholesale quote for our ISO/TS 16949 certified HOWO  Leaf Spring WG9725520286 products!