‌Genuine Sinotruk HOWO A7 Rear Multi-Leaf Spring WG9725520389 - OEM Heavy-Duty Suspension Kit

‌Genuine Sinotruk HOWO A7 Rear Multi-Leaf Suspension Spring (Part No. WG9725520389)‌

This OEM ‌multi-leaf spring‌ provides primary rear suspension for HOWO A7 8x4 dump trucks and heavy haulers. Engineered for extreme load distribution, it prevents axle wrap, reduces wheel hop, and maintains chassis alignment under full payload (up to 80 tons).

‌Technical Specifications‌:

• ‌Part Number‌: WG9725520389 (2023 upgraded specification)
• ‌Compatibility‌: HOWO A7 ZZ5727V3247D/ZZ5727N3247D chassis (2019-Present)
• ‌Spring Type‌: 9-leaf progressive rate parabolic design
• ‌Dimensions‌:
  • Length: 1,800mm (eye-to-eye)
  • Width: 90mm
  • Camber Height: 180mm (unloaded)
• ‌Material‌: 51CrV4 high-tensile steel (quenched & tempered)
• ‌Load Capacity‌:
  • Static: 15,000 kg/axle
  • Dynamic: 24,000 kg/axle (impact load)
• ‌Spring Rate‌: 350 N/mm ±5%
• ‌Finish‌: Shot-peened surface + electrostatic epoxy coating
• ‌Mounting‌: 30mm center bolt + double rebound clips
• ‌Certifications‌: ISO 18137, ECE R111, Sinotruk QC/T 291

‌Performance Advantages‌:
 ‌Fatigue Resistance‌: 500,000 cycles at 2x design load (proven in SAE J788 tests)
Anti-Friction Design‌: PTFE-coated interleaf liners reduce hysteresis
 ‌Corrosion Protection‌: 1,200-hour salt spray resistance
 ‌Precision Arch‌: CNC-formed for consistent axle alignment

‌Why Genuine OEM?‌

• Increases U-bolt life by 40% (matched spring seat profile)
• Maintains correct driveline angles (prevents propeller shaft wear)
• Optimized for HOWO A7 hydraulic dump body cycles
• 30% thicker master leaf vs aftermarket (8mm vs 6mm)
• 3-year/unlimited mileage warranty

‌Failure Prevention‌:
 Non-OEM springs cause:

• Premature shackle bushing failure ($1,200 repair)
• Dangerous axle misalignment
• Frame cracking at spring hangers

‌Installation Criticals‌:

• Torque sequence: Center bolt (300Nm) → U-bolts (450Nm criss-cross pattern)
• Requires bedding-in period: First 500 km at <50% load capacity
• Must replace in axle pairs