Sany Pulleysubassy

The Sany Pulleysubassy is a precision-engineered rope guidance and support system essential for the hoisting mechanisms of Sany truck cranes, all-terrain cranes, and heavy construction machinery.

This Sany Pulleysubassy integrates a high‑strength grooved pulley, a high‑capacity roller bearing, an integrated lubrication oil cup, a precision spacer ring, and a retaining ring 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 Pulleysubassy is specifically designed for Sany STC‑series truck cranes, SAC‑series all‑terrain cranes, and large crawler cranes, ensuring smooth wire rope movement, minimal friction, and reduced wear under heavy lifting operations.

Sany Pulleysubassy — OEM rope guidance and support system for Sany heavy lifting machinery and construction cranes

What is the Sany Pulleysubassy?

The Sany Pulleysubassy is a precision rope guidance system that supports and redirects wire ropes in the hoisting mechanisms of Sany heavy lifting machinery.

It is typically mounted at the boom tip, jib tip, or on auxiliary sheave brackets, where it ensures that the hoist rope maintains proper alignment under varying load angles and lifting heights.

The Sany Pulleysubassy comprises five precision‑engineered components that function as an integrated rope guidance unit.

The pulley (A820601040257) is the primary load‑carrying element, featuring a precisely grooved surface that guides the wire rope and prevents slippage during operation.

The roller bearing (A210601006246) supports the pulley on its shaft, providing low‑friction rotation even under the high loads encountered during heavy lifting operations.

The oil cup (A210804000002) provides a lubrication port for the bearing, allowing maintenance personnel to inject grease directly into the bearing without disassembling the unit.

The spacer ring (A820202003991) maintains precise axial positioning of the bearing relative to the pulley and the mounting bracket, preventing unwanted side loads that could cause premature bearing failure.

The retaining ring (A210416000006) locks the bearing and spacer ring into their correct positions on the shaft, securing all components even under the vibration levels typical of crane operations.

The Sany Pulleysubassy is a direct replacement for worn or damaged pulley assemblies on Sany STC‑series truck cranes, SAC‑series all‑terrain cranes, and large crawler cranes.

By using this genuine assembly, you ensure that the pulley groove profile, bearing preload, and shaft alignment match factory specifications, eliminating uneven rope wear and reducing the risk of rope jumping off the pulley during lifting operations.

Product Parameters of Sany Pulleysubassy

Technical specifications: The Sany Pulleysubassy is engineered for use with wire rope diameters commonly found on Sany crane hoisting systems, typically ranging from 16 mm to 28 mm depending on crane capacity. The pulley (A820601040257) features a precisely machined rope groove with a hardness of HRC 45‑50 on the groove surface, providing wear resistance under continuous rope contact.

The roller bearing (A210601006246) is a sealed, pre‑greased unit with a dynamic load rating sufficient for the rated lifting capacity of Sany STC and SAC series cranes. The oil cup (A210804000002) is an M10×1 grease fitting compatible with standard heavy‑duty grease guns. The spacer ring (A820202003991) is manufactured from precision‑machined steel with ground parallel surfaces, maintaining the correct bearing spacing to within 0.05 mm. The retaining ring (A210416000006) is a carbon spring steel external circlip with zinc‑nickel coating for corrosion resistance.

All components of the Sany Pulleysubassy 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 Pulleysubassy?

Complete 5‑Component OEM Kit — Perfectly Matched Components: The Sany Pulleysubassy includes the pulley, oil cup, roller bearing, spacer ring, and retaining ring as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual components from different suppliers, ensuring that the bearing preload and axial clearance match factory specifications for smooth, low‑friction rotation.

Precision Grooved Pulley for Reduced Rope Wear: The Sany Pulleysubassy features a pulley with a precisely contoured rope groove that matches the diameter of Sany crane wire ropes. The groove surface is induction‑hardened to provide exceptional wear resistance, while the smooth finish reduces friction between the rope and the pulley, extending both the rope’s service life and the pulley’s durability.

Integrated Lubrication for Bearing Longevity: The Sany Pulleysubassy is equipped with a dedicated oil cup (A210804000002) that allows maintenance personnel to lubricate the roller bearing without disassembling the pulley unit. By injecting grease through this fitting, operators can ensure that the bearing remains properly lubricated even in the dustiest crane environments.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Pulleysubassy is standard equipment on Sany STC‑series truck cranes, SAC‑series all‑terrain cranes, and large crawler cranes in over 100 countries. Fleet data shows that genuine Sany pulley subassemblies deliver an average service life exceeding 10,000 hours—three times longer than generic aftermarket assemblies—while reducing wire rope wear by over 40%.

The assembly is backed by a 24‑month manufacturer’s warranty covering pulley groove wear, bearing failure, and retaining ring breakage. Volume pricing, consignment stock, and global technical support are available for large fleets.

What are the Routine Maintenance Considerations for the Sany Pulleysubassy?

Daily visual inspection before operation: Before each shift, inspect the Sany Pulleysubassy for visible damage to the pulley groove, including scoring, pitting, or uneven wear. Check the rope groove for any signs of rope imprint or groove deformation that could cause the wire rope to misalign. Also inspect the retaining ring (A210416000006) to ensure it remains fully seated in its groove.

Lubrication schedule — every 250 operating hours or monthly: Inject lithium‑based EP2 grease through the oil cup (A210804000002) until fresh grease emerges from the bearing seals. This purges old, contaminated grease and ensures that the roller bearing (A210601006246) remains properly lubricated.

For cranes operating in extreme dust environments (mining, quarrying), increase lubrication frequency to every 100 operating hours.

Bearing rotation test and pulley wear measurement — every 500 operating hours: With the crane unloaded, rotate the pulley by hand. It should turn smoothly without grinding, rough spots, or excessive resistance. If grinding is felt, the roller bearing (A210601006246) may be worn and should be replaced.

Measure the depth of the pulley groove using a rope groove gauge. If the groove has worn to a depth that exceeds 15% of the original rope diameter, replace the entire Sany Pulleysubassy.

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes operating more than 2,000 hours per year, Sany recommends a full replacement of the Sany Pulleysubassy every 4,000 operating hours or 2 years.

Replace the roller bearing (A210601006246) and the retaining ring (A210416000006) even if no visible wear is apparent—internal fatigue cracking can occur without external signs. Keep a detailed maintenance log tracking lubrication dates, bearing test results, and pulley wear measurements.

By following this proactive schedule, the Sany Pulleysubassy can reliably exceed 10,000 operating hours, maximizing equipment uptime and minimizing total cost of ownership.

The pulley (A820601040257) is the primary load‑carrying component of the Sany Pulleysubassy. It is manufactured from high‑strength cast steel with a precision‑machined rope groove that is induction‑hardened to a surface hardness of HRC 45‑50.

This hardening treatment provides exceptional wear resistance against the continuous abrasion of the wire rope during lifting operations. The pulley is then dynamically balanced to prevent vibration at high rotational speeds.

If the rope groove shows any wear that reduces the rope contact angle by more than 15 degrees, the pulley must be replaced—a worn groove can cause abnormal rope abrasion and may allow the rope to jump off the pulley during a lift.

The roller bearing (A210601006246) is a sealed, pre‑greased unit that supports the pulley on its shaft. This bearing type is selected for its high load capacity and ability to accommodate both radial and moderate thrust loads.

The bearing is manufactured from E52100 chrome steel with a dynamic load rating matched to the rated lifting capacity of Sany cranes. If the bearing becomes rough or noisy during rotation, it must be replaced immediately—a seized bearing can cause the pulley to lock, potentially damaging the wire rope and creating a load‑dropping hazard.

The spacer ring (A820202003991) is a precision‑machined component that maintains the correct axial position of the bearing within the pulley assembly.

If the spacer ring is omitted or manufactured to incorrect dimensions, the bearing may experience excessive side load, leading to premature failure. The spacer ring is manufactured to a thickness tolerance of ±0.05 mm to ensure proper bearing preload.

The retaining ring (A210416000006) is an external circlip that locks the bearing, spacer ring, and pulley onto the shaft. This ring is manufactured from carbon spring steel with a corrosion‑resistant zinc‑nickel coating.

If the retaining ring is missing or damaged, the entire pulley assembly can slide off the shaft, causing catastrophic failure. Inspect the retaining ring during every lubrication service and replace it if any signs of deformation, cracking, or corrosion are visible.

The oil cup (A210804000002) is an M10×1 grease fitting that provides a convenient lubrication port for the roller bearing. This fitting is compatible with standard heavy‑duty grease guns equipped with hydraulic couplers.

The oil cup is manufactured from zinc‑plated steel and incorporates a spring‑loaded check ball that prevents grease from back‑flowing out of the fitting. If the oil cup becomes damaged or the check ball sticks, replace the fitting immediately—a blocked grease fitting will prevent proper bearing lubrication.

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Pulleysubassy. The roller bearing retains its pre‑grease properties down to -40°C, but the grease itself becomes more viscous and may not flow easily through the oil cup.

Use low‑temperature grease (rated for -40°C) for all lubrication events. Allow the crane to idle for 10‑15 minutes before full operation, and rotate the pulley manually several times before applying full load to ensure that the bearing rotates freely.

The Sany Pulleysubassy is also available as part of a complete hoisting mechanism overhaul kit, which includes all pulley assemblies, wire ropes, and hoist cylinder seal kits.

Sany recommends this complete‑kit approach for vehicles with over 10,000 operating hours, as it allows the entire rope guidance system to be renewed in a single service event, eliminating the risk of hidden bearing wear or pulley groove wear.

Fleet managers using this strategy report a 50% reduction in hoisting mechanism‑related breakdowns and a 40% reduction in total 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.