Sany Fixing-Shaft-Triple-Hinge

The Sany Fixing-Shaft-Triple-Hinge is a critical structural connection assembly that joins the boom, swing table, and luffing mechanism on Sany heavy truck cranes, all‑terrain cranes, and large construction equipment.

This Sany Fixing-Shaft-Triple-Hinge integrates precision‑ground shafts, pressure plates, a grease nipple cap, an oil cup, spacers, and a full complement of high‑strength fasteners 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 Fixing-Shaft-Triple-Hinge is specifically designed for Sany STC‑series and SAC‑series cranes, providing a robust pivot point that withstands the high loads and continuous articulation of the boom during lifting operations, ensuring stability, precision, and long‑term durability.

Sany Fixing-Shaft-Triple-Hinge — OEM boom pivot assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Fixing-Shaft-Triple-Hinge?

The Sany Fixing-Shaft-Triple-Hinge is a complete OEM pivot assembly that provides the critical connection between the boom, the swing table, and the luffing mechanism on Sany heavy lifting equipment. This robust hinge system enables controlled boom articulation, allowing precise adjustment of the boom angle during lifting operations.

The Sany Fixing-Shaft-Triple-Hinge assembly comprises 13 precision‑engineered components that function as an integrated pivot system. The lower luffing triple‑hinge shaft provides the primary pivot axis, while additional shafts and pressure plates secure the connection. The grease nipple cap protects the lubrication point, and the oil cup ensures continuous lubrication of the bearing surfaces.

The Sany Fixing-Shaft-Triple-Hinge is a critical component for crane stability and safety. It must handle the full weight of the boom and the lifted load, while allowing smooth, friction‑free articulation. The precision‑ground shafts and hardened pressure plates ensure minimal wear and consistent performance even under high dynamic loads during luffing maneuvers.

The Sany Fixing-Shaft-Triple-Hinge is a direct replacement for worn or damaged boom pivot assemblies on Sany STC‑series and SAC‑series cranes. By using this genuine assembly, you ensure that the shaft diameters, bushing clearances, and mounting bolt patterns match factory specifications, eliminating slop and ensuring precise boom control.

Product Parameters of Sany Fixing-Shaft-Triple-Hinge

Technical specifications: The Sany Fixing-Shaft-Triple-Hinge is engineered for maximum loads matched to the rated lifting capacity of Sany STC and SAC series cranes. The main pivot shaft (10838001) is manufactured from high‑strength alloy steel with precision‑ground bearing surfaces and induction‑hardened raceways (HRC 55‑60).

All shafts and pressure plates are zinc‑nickel coated for 500+ hours of salt spray resistance. The oil cup (A210804000002) provides a convenient lubrication point, while the protective cap (A290000001564) keeps the grease nipple clean and free from contamination. The fastening system includes property class 10.9 bolts and hardened washers that ensure vibration‑resistant attachment.

All components of the Sany Fixing-Shaft-Triple-Hinge 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 Fixing-Shaft-Triple-Hinge?

Complete 13‑Component OEM Kit — Perfectly Matched Components: The Sany Fixing-Shaft-Triple-Hinge includes every shaft, pressure plate, spacer, oil cup, protective cap, and fastener as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual pivot components from different suppliers, ensuring that all shaft diameters and bushing clearances match factory specifications.

Precision‑Ground Shafts for Smooth Articulation: The Sany Fixing-Shaft-Triple-Hinge uses precision‑ground shafts with induction‑hardened surfaces that provide exceptional wear resistance and smooth rotation. The triple‑hinge design allows controlled articulation of the boom without slop or binding, ensuring precise load positioning and reducing operator fatigue during luffing operations.

Integrated Lubrication for Extended Service Life: The Sany Fixing-Shaft-Triple-Hinge includes an oil cup (A210804000002) and a protective grease nipple cap (A290000001564) that enable easy lubrication of the pivot points. Regular greasing through this dedicated port ensures that the bearing surfaces remain properly lubricated, reducing wear and extending the service life of the hinge assembly.

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

What are the Routine Maintenance Considerations for the Sany Fixing-Shaft-Triple-Hinge?

Daily visual inspection before operation: Before each shift, inspect the Sany Fixing-Shaft-Triple-Hinge for visible signs of wear, corrosion, or looseness around the pivot points. Check that the protective grease nipple cap (A290000001564) is securely in place. Look for any signs of oil leakage from the oil cup or around the shaft seals. Check that all mounting bolts and pressure plates are tight.

Lubrication — every 250 operating hours: Apply the recommended EP2 lithium‑based grease through the oil cup (A210804000002) using a standard grease gun. Pump until fresh grease appears around the shaft ends, indicating that old, contaminated grease has been purged. Wipe off excess grease to prevent dirt accumulation. Ensure the protective cap is refitted after greasing to keep the nipple clean.

Shaft wear measurement and bolt torque check — every 500 operating hours: Using calipers, measure the shaft diameter at several points. If wear exceeds 0.5 mm from the original specification, the shaft must be replaced. Check the torque of all bolts (A210111000242, A210111000107) and the pressure plate bolts to the manufacturer specification (typically 100‑120 Nm for M16 fasteners). Mark bolt heads after torquing for quick visual verification.

Preventative replacement schedule — every 4,000 hours or 2 years: For high‑use cranes, Sany recommends a full replacement of the Sany Fixing-Shaft-Triple-Hinge every 4,000 operating hours or 2 years. Replace all shafts, pressure plates, spacers, and fasteners as a set—even if no visible wear is apparent, hidden fatigue and corrosion can occur. Keep a detailed maintenance log tracking lubrication dates, shaft wear measurements, and bolt torque values. By following this proactive schedule, the Sany Fixing-Shaft-Triple-Hinge can reliably exceed 10,000 operating hours.

The lower luffing triple‑hinge shaft (10838001) is the primary structural element of the Sany Fixing-Shaft-Triple-Hinge. This shaft is manufactured from high‑strength alloy steel using a forging process that ensures a continuous grain structure for maximum fatigue resistance. The shaft is precision‑ground to a surface finish of 0.4 μm Ra and induction‑hardened to a depth of 3‑4 mm with a surface hardness of HRC 55‑60, providing exceptional wear resistance under the high rolling and sliding contact stresses encountered during boom articulation.

The pressure plates (10818083, 10837516) secure the shaft in its housing and distribute the clamping force over a wide area, preventing localized deformation. These plates are manufactured from hardened steel with precision‑machined surfaces that match the shaft end geometry. The dead axle plate (A820101322968) provides an additional locking feature that prevents axial movement of the shaft under load, ensuring that the boom remains precisely aligned throughout the full range of luffing motion.

The spacer (A820202003976) maintains the correct axial clearance between the shaft and the housing, preventing end‑play that could cause misalignment and accelerated wear. This spacer is manufactured from hardened steel with ground parallel faces to ensure even load distribution. The oil cup (A210804000002) and protective cap (A290000001564) together form a reliable lubrication system that keeps the bearing surfaces supplied with clean grease, even in dusty crane environments.

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Fixing-Shaft-Triple-Hinge. Use low‑temperature grease (rated for -40°C) for lubrication. The steel shafts become more brittle at low temperatures; avoid shock loading that could cause shaft fracture. Allow the machine to idle for 10‑15 minutes before full operation, and cycle the boom slowly several times to warm the grease and allow the hinge to articulate freely before applying full load.

The Sany Fixing-Shaft-Triple-Hinge is also available as part of a complete boom articulation overhaul kit, which includes the triple‑hinge shaft, all pressure plates, spacers, fasteners, and the lubrication components. Sany recommends this complete‑kit approach for vehicles with over 10,000 operating hours, as it allows the entire boom pivot system to be renewed in a single service event, eliminating the risk of hidden shaft fatigue or bushing wear that could compromise boom control.

Fleet managers using this strategy report a 50% reduction in boom articulation‑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.