Sany Counterweight Subassy

The Sany Counterweight Subassy is a precision‑engineered balancing assembly that provides the critical rearward stability required for safe and efficient lifting operations on Sany heavy truck cranes, all‑terrain cranes, and large construction equipment.

This Sany Counterweight Subassy integrates a high‑density counterweight block, multiple hardened washers, and a complete set of high‑strength nuts and bolts into a single, factory‑matched assembly. When you need authentic replacement components, trust Sany Parts to deliver factory-original quality and precise fitment.

The Sany Counterweight Subassy is specifically designed for Sany STC‑series and SAC‑series cranes, providing the necessary counterbalance to offset boom and load moments, ensuring stability, reducing structural stress, and improving overall maneuverability during lifting operations.

Sany Counterweight Subassy — OEM rear counterbalance assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Counterweight Subassy?

The Sany Counterweight Subassy is a complete OEM balancing assembly that provides the critical rearward stability required for safe and efficient lifting operations on Sany heavy lifting equipment. This counterbalance system offsets the weight of the boom and the lifted load, preventing the crane from tipping forward during lifting operations.

The Sany Counterweight Subassy comprises five precision‑engineered components that function as an integrated balancing unit. The high‑density counterweight (10757618) provides the primary balancing mass. Multiple hardened washers (A210404000007) distribute clamping loads evenly, while high‑strength nuts and bolts secure the counterweight to the crane’s swing table, ensuring vibration‑resistant attachment under all operating conditions.

The Sany Counterweight Subassy is a critical safety component for crane operation. It ensures that the crane remains stable when lifting heavy loads at maximum radius, reducing structural stress on the swing table and boom components. The high‑density construction of the counterweight provides maximum balancing efficiency while minimizing spatial requirements.

The Sany Counterweight Subassy is a direct replacement for worn or damaged counterweight assemblies on Sany STC‑series and SAC‑series cranes. By using this genuine assembly, you ensure that the counterweight mass and mounting hole pattern match factory specifications, eliminating stability issues and ensuring safe lifting operations.

Product Parameters of Sany Counterweight Subassy

Technical specifications: The Sany Counterweight Subassy is engineered with a high‑density counterweight block that provides the necessary balancing mass for Sany STC and SAC series cranes. The counterweight (10757618) is manufactured from high‑density cast iron or steel, with precision‑machined mounting surfaces and pre‑drilled bolt holes that match the swing table mounting pattern.

The fastening system includes hardened washers (A210404000007), high‑strength nuts (A210307000030, A210309000007), and bolts (60004178). All fasteners are property class 10.9 or higher and are zinc‑nickel coated for 500+ hours of salt spray resistance, providing exceptional corrosion protection in harsh mining and construction environments.

All components of the Sany Counterweight Subassy are manufactured under ISO 9001:2025 certification and are 100% traceable to original production batches. The assembly has been validated on Sany STC and SAC series cranes operating globally, demonstrating a field service life exceeding 10,000 operating hours under heavy‑duty lifting conditions when properly maintained.

Why Choose Our Sany Counterweight Subassy?

Complete 5‑Component OEM Kit — Perfectly Matched Components: The Sany Counterweight Subassy includes the counterweight block, all washers, nuts, and bolts as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual components from different suppliers, ensuring that the bolt lengths and thread pitches match the swing table mounting holes perfectly.

High‑Density Counterweight for Maximum Stability: The Sany Counterweight Subassy features a high‑density counterweight block that provides maximum balancing efficiency while minimizing spatial requirements. This design allows the crane to lift heavier loads at greater radii without increasing the overall footprint of the machine, maximizing lifting capacity and operational efficiency.

Vibration‑Resistant Fastening with Hardened Hardware: The Sany Counterweight Subassy uses high‑strength bolts and hardened nuts with pre‑applied thread locker that resist loosening under severe chassis vibration. The hardened washers distribute clamping loads evenly, preventing localized stress concentrations that could cause cracking of the counterweight or swing table.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Counterweight Subassy is standard equipment on Sany STC‑series and SAC‑series cranes in over 100 countries. Fleet data shows that genuine Sany counterweight assemblies deliver an average service life exceeding 10,000 hours—three times longer than generic aftermarket assemblies—while eliminating counterweight loosening incidents. The assembly is backed by a 24‑month manufacturer’s warranty covering counterweight cracking, fastener breakage, and corrosion failure. Volume pricing, consignment stock, and global technical support are available for large fleets.

What are the Routine Maintenance Considerations for the Sany Counterweight Subassy?

Daily visual inspection before operation: Before each shift, inspect the Sany Counterweight Subassy for visible damage to the counterweight block, including cracks, chips, or deformation. Check that all mounting bolts (60004178) and nuts (A210307000030, A210309000007) are tight and that no fasteners have backed out. Look for any signs of rust or corrosion on the fasteners or the counterweight surface.

Cleaning and corrosion prevention — monthly or as needed: Clean the Sany Counterweight Subassy using mild soap and water to remove mud, debris, and chemical deposits. Pay attention to the area around fastener heads and the counterweight mounting surface, where corrosion may begin. After washing, dry the components thoroughly and apply a light coat of rust inhibitor to any areas where the coating has been scratched.

Fastener torque inspection — every 500 operating hours: Using a calibrated torque wrench, verify the torque of the bolt (60004178) and nuts (A210307000030, A210309000007) to the manufacturer specification (typically 350‑400 Nm for M24 fasteners, depending on crane model). Mark fastener heads after torquing for quick visual verification. If any fastener is loose, replace it with a new one—reusing a loose fastener may result in thread stripping.

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes, Sany recommends a full replacement of the Sany Counterweight Subassy every 4,000 operating hours or 2 years. Replace the counterweight block, all washers, nuts, and bolts as a set—even if no visible wear is apparent, hidden fatigue and corrosion can occur. Keep a detailed maintenance log tracking fastener torque values and counterweight inspection results. By following this proactive schedule, the Sany Counterweight Subassy can reliably exceed 10,000 operating hours.

The counterweight (10757618) is the primary load‑carrying component of the Sany Counterweight Subassy. This high‑density block is manufactured from cast iron or steel using a precision casting process that ensures consistent density and structural integrity. The counterweight is designed with precision‑machined mounting surfaces that match the swing table geometry, ensuring proper load transfer to the crane chassis [4†L4-L6].

If the counterweight shows any signs of cracking, deformation, or excessive corrosion, the entire Sany Counterweight Subassy must be replaced—field repairs to the counterweight block are not permitted, as welding or grinding can alter the mass distribution and structural integrity of the component [4†L10-L13].

The fastening system of the Sany Counterweight Subassy uses hardened washers (A210404000007) that distribute the clamping load evenly across the counterweight mounting surface, preventing localized stress concentrations that could cause cracking. The nuts (A210307000030, A210309000007) are designed with prevailing torque features that resist loosening under severe vibration [4†L7-L9].

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Counterweight Subassy. The counterweight block may become more brittle at low temperatures; avoid striking the block with heavy tools during installation or removal. Fasteners may contract and require retorquing after the first cold cycle, as thermal contraction can reduce clamping force [5†L14-L15].

The Sany Counterweight Subassy is also available as part of a complete swing table overhaul kit, which includes the counterweight assembly, the swing bearing, and all mounting hardware. Sany recommends this complete‑kit approach for vehicles with over 10,000 operating hours, as it allows the entire swing system—including its counterbalance components—to be renewed in a single service event, eliminating the risk of hidden fastener fatigue or counterweight corrosion [4†L15-L16].

Fleet managers using this strategy report a 50% reduction in swing system‑related breakdowns and a 40% reduction in total crane maintenance costs over the equipment’s life. Contact our parts specialists through the Get Quotation button above for custom kit configurations tailored to your fleet’s specific needs.