Sany Pulley-Boom End

The Sany Pulley-Boom End is a precision‑engineered rope guidance assembly installed at the tip of the telescopic boom on Sany heavy truck cranes and all‑terrain cranes, providing accurate wire rope alignment for smooth hoisting operations.

This Sany Pulley-Boom End integrates a heavy‑duty pulley bracket, a complete pulley subassembly, multiple locking pins, a hardened shaft, spacer sleeves, and a catch plate 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 Pulley-Boom End is specifically designed for Sany STC‑series and SAC‑series cranes, ensuring reliable rope guidance, reduced cable wear, and extended service life under the most demanding lifting conditions.

Sany Pulley-Boom End — OEM boom‑tip rope guidance assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Pulley-Boom End?

The Sany Pulley-Boom End is a complete OEM rope guidance assembly mounted at the tip of the telescopic boom on Sany heavy lifting machinery. Its primary function is to ensure that the hoist wire rope maintains proper alignment as it exits the boom, preventing chafing, misalignment, and premature rope failure during lifting operations.

The Sany Pulley-Boom End assembly comprises 12 precision‑engineered components that function as an integrated rope guidance unit. The pulley bracket provides the structural foundation. The pulley subassembly (A819700000631) is the core rotating component that guides the wire rope with minimal friction. Multiple pins and shafts secure the assembly, while spacer sleeves maintain correct axial positioning.

The Sany Pulley-Boom End is a critical component for crane productivity and safety. It ensures that the hoist rope moves smoothly without binding or excessive wear, preventing premature rope failure and reducing the risk of load‑dropping incidents. The precision‑machined groove in the pulley maintains consistent rope contact, eliminating side loading that causes abrasion and rope fraying.

The Sany Pulley-Boom End is a direct replacement for worn or damaged boom‑tip pulley assemblies on Sany STC‑series truck cranes and SAC‑series all‑terrain cranes. By using this genuine assembly, you ensure that the pulley groove profile and bearing preload match factory specifications, eliminating rope misalignment and reducing the risk of cable override incidents.

Product Parameters of Sany Pulley-Boom End

Technical specifications: The Sany Pulley-Boom End is engineered for use with wire rope diameters commonly found on Sany crane hoisting systems. The pulley bracket (10585145) is fabricated from high‑strength steel with precision‑machined mounting surfaces. The pulley subassembly (A819700000631) features a precision‑machined groove with a surface hardness of HRC 45‑50.

The shaft (10583699) is manufactured from high‑strength alloy steel with precision‑ground bearing surfaces. Multiple locking pins (10583698, A829900002661, A210501000021) secure the assembly against vibration loosening. All components are manufactured under ISO 9001:2025 certification and are 100% traceable to original production batches. The Sany Pulley-Boom End has been validated on Sany STC and SAC series cranes, demonstrating a field service life exceeding 10,000 operating hours.

Why Choose Our Sany Pulley-Boom End?

Complete 12‑Component OEM Kit — Perfectly Matched Components: The Sany Pulley-Boom End includes every component as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual components from different suppliers, ensuring that the pulley groove profile and bearing preload match factory specifications.

Precision‑Machined Pulley Groove for Reduced Rope Wear: The Sany Pulley-Boom End features a precisely contoured 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 rope service life and pulley durability.

Multiple Locking Features for Vibration Security: The Sany Pulley-Boom End uses multiple locking pins, an elastic pin, and a catch plate that secure the assembly under all operating conditions. This redundant locking system prevents loosening even under high‑frequency vibration, ensuring that the pulley remains properly aligned for the life of the assembly.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Pulley-Boom End is standard equipment on Sany STC‑series and SAC‑series cranes in over 100 countries. Fleet data shows that genuine Sany boom‑end pulley assemblies deliver an average service life exceeding 10,000 hours—three times longer than generic aftermarket components—while eliminating rope abrasion failures. The assembly is backed by a 24‑month manufacturer’s warranty covering pulley groove wear, bearing failure, and shaft breakage. Volume pricing, consignment stock, and global technical support are available for large fleets.

What are the Routine Maintenance Considerations for the Sany Pulley-Boom End?

Daily visual inspection before operation: Before each shift, inspect the Sany Pulley-Boom End for visible damage to the pulley bracket, pulley groove, and all locking pins. Check the pulley groove for any signs of uneven wear, pitting, or scoring. Examine the shaft for any signs of bending or corrosion. Verify that all locking pins are fully engaged and that the catch plate is secure.

Lubrication — as required by pulley subassembly: The pulley subassembly (A819700000631) may require periodic lubrication depending on the bearing type. If the pulley does not rotate freely, apply the recommended grease through the grease fitting (if equipped). Otherwise, the sealed bearing requires no regular greasing. Do not over‑lubricate, as excess grease can attract dust and debris.

Pin and shaft inspection — every 500 operating hours: Inspect all pins (A210501000021, 10583698, A829900002661) for signs of wear or deformation. Measure the shaft (10583699) diameter; if wear exceeds 0.5 mm, replace the assembly. Check the spacer (10131942) and spacer sleeve (11104876) for wear; replace if any deformation is visible. Tighten the bolt (A210111000089) to the manufacturer specification of 25‑30 Nm.

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes, Sany recommends a full replacement of the Sany Pulley-Boom End every 4,000 operating hours or 2 years. Replace the pulley bracket, pulley subassembly, all pins, shaft, spacer sleeve, and catch plate as a set. Keep a detailed maintenance log tracking pin wear measurements and pulley rotation test results. By following this proactive schedule, the Sany Pulley-Boom End can reliably exceed 10,000 operating hours.

The pulley bracket (10585145) is the structural foundation of the Sany Pulley-Boom End. This high‑strength steel bracket provides precise mounting alignment and supports the pulley under full operational loads. The bracket features precision‑machined mounting surfaces that match the boom tip geometry. If the bracket shows any signs of cracking, bending, or deformation, the entire Sany Pulley-Boom End must be replaced—field welding repairs are prohibited, as welding heat can alter the metallurgical properties and cause premature fatigue failure.

The pulley subassembly (A819700000631) is the core rotating component of the Sany Pulley-Boom End. This subassembly includes the grooved pulley, the roller bearing, and the retaining hardware. The pulley 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 locking system of the Sany Pulley-Boom End uses multiple pins to secure the assembly under vibration. The pin (A210501000021) is a primary retaining pin, the elastic pin (A829900002661) provides secondary retention, and the backing pin (10583700) further secures the shaft. The catch plate (10137549) locks the pins in position. This redundant locking system prevents loosening even under severe crane vibration, ensuring that the pulley remains correctly aligned throughout the service life.

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Pulley-Boom End. The pulley bearing retains its pre‑grease properties down to -40°C, but the grease itself becomes more viscous and may cause slightly increased rotational resistance. Allow the machine to idle for 10‑15 minutes before full operation, and rotate the pulley manually several times before applying full load. The pulley groove may be more prone to impact damage in cold conditions due to increased steel brittleness; avoid shock loading that could cause groove cracking.

The Sany Pulley-Boom End is also available as part of a complete boom‑tip overhaul kit, which includes the pulley bracket, pulley subassembly, all pins, the shaft, spacer sleeves, and the catch plate. Sany recommends this complete‑kit approach for vehicles with over 10,000 operating hours, as it allows the entire rope guidance system at the boom tip to be renewed in a single service event, eliminating the risk of hidden bearing wear or groove damage.

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.