Product Introduction

The 3953200678 Balance Shaft Assembly is one of the core components of the rear tandem axle suspension system used on Mercedes-Benz SK series and Beiben NG80 heavy-duty trucks.

Installed inside the rear bogie suspension, the balance shaft serves as the pivot shaft for the equalizer beam, allowing the suspension to distribute vehicle weight evenly between the front and rear drive axles. This design improves traction, minimizes chassis stress, and enhances ride stability on uneven road surfaces.

The balance shaft assembly works together with:

• Equalizer beam
• Suspension brackets
• Leaf spring assembly
• Bronze bushings
• Oil seals
• Rear axle housing
• U-bolts
• Suspension pins

Its primary functions include:

• Balancing axle loads between tandem axles
• Supporting the equalizer beam pivot
• Absorbing road impacts and vibration
• Improving suspension flexibility
• Extending suspension component service life

During heavy-duty transportation, mining, and construction operations, the balance shaft is subjected to continuous shock loads, vibration, and high axle loads. Excessive wear or damage may cause:

• Suspension noise
• Uneven axle load distribution
• Premature bushing wear
• Vehicle instability
• Increased tire wear
• Reduced suspension performance

The 3953200678 balance shaft assembly is manufactured from premium forged alloy steel using precision CNC machining and advanced heat treatment. Critical bearing journals and sealing surfaces are accurately machined to OEM tolerances, ensuring excellent fitment, smooth rotation, and long service life.

Designed according to OEM specifications, this balance shaft assembly provides direct replacement compatibility for Mercedes-Benz SK series and Beiben NG80 rear suspension systems. It is widely used for suspension overhaul, fleet maintenance, heavy truck repair, mining vehicles, construction equipment, and commercial transportation.

Each balance shaft assembly undergoes comprehensive quality inspections including:

• Material composition analysis
• Hardness testing
• Shaft straightness inspection
• Journal diameter measurement
• Surface finish inspection
• Installation fitment verification

to ensure OEM-level quality, durability, and reliability.

Technical Specifications

Vehicle Fitment

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