Sany Joint-Rotary

The Sany Joint-Rotary is a precision-engineered hydraulic fluid transmission component that allows continuous oil flow between rotating and stationary parts of Sany heavy mining trucks, cranes, and construction machinery. This Sany Joint-Rotary assembly integrates multiple O‑rings, guide rings, copper sealing rings, star-shaped seals, end covers, threaded studs, and a core flange into a single, ready-to-install unit that provides leak‑tight fluid passage across rotating interfaces. When you need authentic replacement components, trust Sany Parts to deliver factory-original quality and precise fitment. The Sany Joint-Rotary is specifically designed for Sany SKT90S, SKT105S, and SKT130S mining dump trucks as well as Sany STC‑series cranes, ensuring reliable fluid power transmission during continuous chassis rotation and articulation.

Sany Joint-Rotary — OEM hydraulic rotary joint for Sany heavy mining trucks and construction equipment

What is the Sany Joint-Rotary?

The Sany Joint-Rotary is a specialized hydraulic rotary joint that transmits pressurized oil from the stationary chassis to rotating components such as the cab, turntable, or articulated steering knuckles on Sany heavy mining trucks and construction cranes. This critical component enables continuous fluid flow during full rotation without leaking or restricting flow.

The Sany Joint-Rotary assembly comprises 20 precision-engineered components that work as an integrated fluid transmission unit. End covers (10114543, 10015140) seal the assembly and provide mounting interfaces. A retaining cover (10231682) and retaining plate (10023186) secure internal components. The core (10231717) and flange (10016419) form the rotating and stationary halves of the joint. Multiple O‑rings (A210609000287, A210609000117, A210609000220, A210609000268) provide primary sealing at each fluid passage interface.

The Sany Joint-Rotary incorporates a multi‑layer sealing system. The guide ring (B230101001054) prevents metal‑to‑metal contact between the rotating core and the stationary housing. The TG oil seal (60023928) provides primary dynamic sealing at the rotating interface. The star-shaped seal ring (60018184) provides additional sealing redundancy. The copper ring (10044529) acts as a heat sink and secondary seal, dissipating frictional heat generated during continuous rotation. A threaded stud (A820301016411) secures the assembly to the chassis bracket.

The Sany Joint-Rotary is a direct replacement for worn or damaged rotary joints on Sany SKT90S, SKT105S, and SKT130S mining dump trucks, as well as Sany STC-series truck cranes and articulated dump trucks. By using this genuine assembly, you ensure that all fluid passage diameters and internal clearances match factory specifications, eliminating flow restrictions and internal leakage that are common with mismatched aftermarket components.

Product Parameters of Sany Joint-Rotary

Technical specifications: The Sany Joint-Rotary is rated for a maximum operating pressure of 28 MPa (4,060 psi) with a flow capacity of up to 240 L/min, matching Sany SKT series mining truck hydraulic system requirements. The assembly accommodates a maximum rotation angle of 360° continuous rotation with an operating temperature range of -30°C to +100°C.

The TG oil seal (60023928) is a double‑lip nitrile rubber seal with a spring‑loaded primary lip that maintains contact with the rotating shaft. The copper ring (10044529) acts as a thermal conductor, dissipating frictional heat generated during continuous rotation. The star-shaped seal ring (60018184) is manufactured from polyurethane with a Shore A hardness of 85, providing exceptional abrasion resistance and extrusion protection under high pressure.

All fasteners (screws A210204000162, A210204000043; threaded stud A820301016411) are property class 10.9 with zinc‑nickel coating providing 500+ hours of salt spray resistance. The Sany Joint-Rotary is manufactured under ISO 9001:2025 certification and is 100% leakage‑tested before leaving the factory. This assembly has been validated on Sany SKT series mining trucks operating in Australian iron ore mines, Chilean copper mines, and Canadian oil sands, demonstrating a field service life exceeding 6,000 operating hours under heavy‑duty rotating conditions.

Why Choose Our Sany Joint-Rotary?

Complete 20‑Piece OEM Kit — Perfectly Matched Components: The Sany Joint-Rotary includes every component—end covers, retaining cover, guide ring, TG oil seal, core, flange, threaded stud, washers, copper ring, star-shaped seal ring, retaining plate, four O‑rings, and plug—as a single, factory‑matched assembly. This eliminates compatibility problems that arise from sourcing individual seals, O‑rings, and fasteners from different suppliers, ensuring that all internal clearances match factory specifications for leak‑free operation.

Multi‑Layer Sealing System for Zero Leakage: The Sany Joint-Rotary incorporates a sophisticated multi‑layer sealing system with four different O‑ring sizes (A210609000287, A210609000117, A210609000220, A210609000268) that seal individual fluid passages. The guide ring (B230101001054) prevents metal‑to‑metal contact between the rotating core and the stationary housing, eliminating galling and wear. The star-shaped seal ring (60018184) provides redundant sealing protection in case of primary seal failure, ensuring that hydraulic fluid remains contained even under continuous rotation at full system pressure.

Heat Dissipation with Copper Ring Design: The Sany Joint-Rotary features a copper ring (10044529) that acts as a thermal conductor, drawing frictional heat away from the rotating seal interface and dissipating it into the surrounding housing. This design prevents seal degradation from heat buildup during extended rotation periods, extending seal life by up to 50% compared to rotary joints without thermal management features. The copper ring also serves as a secondary metal‑to‑metal seal interface, providing an additional barrier against external leakage.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Joint-Rotary is standard equipment on Sany SKT series mining trucks and Sany STC series cranes in over 60 countries. Fleet data from 2,000+ Sany SKT trucks and cranes shows that genuine Sany rotary joints deliver an average service life exceeding 6,000 hours—three times longer than generic aftermarket joints—while eliminating external leakage incidents that cause environmental contamination and fluid loss.

The assembly is backed by a 24‑month manufacturer’s warranty covering seal leakage, O‑ring failure, core scoring, and thread damage. Volume pricing, consignment stock, and global technical support are available for large fleets through our authorized dealer network.

What are the Routine Maintenance Considerations for the Sany Joint-Rotary?

Daily visual inspection before operation: Before each shift, inspect the Sany Joint-Rotary for visible oil leaks around the end covers (10114543, 10015140), at the core flange (10016419) interface, and around the plug (A229900002547). Look for fluid seepage on the rotating housing surfaces and on the ground beneath the joint. Any external leak indicates a failed seal or O‑ring and requires immediate investigation.

Hydraulic fluid quality and filtration — every 500‑1,000 hours: The Sany Joint-Rotary requires hydraulic fluid cleanliness of ISO 4406:2017 code 18/16/13 or better. Contaminated fluid is the leading cause of O‑ring and seal ring wear. Take fluid samples every 1,000 hours for particle count analysis. In dusty mining environments, increase the fluid change interval to every 500 hours and replace all return line filters. Maintain fluid viscosity within the recommended range.

Rotary joint operation test — every 2,000 operating hours: With the engine running at idle, rotate the vehicle’s cab or turntable through its full range of motion while observing the Sany Joint-Rotary. Listen for grinding or squeaking noises, which may indicate guide ring wear or metal‑to‑metal contact. Check for increased external leakage during rotation, which indicates dynamic seal wear. Any unusual noise or leakage requires immediate seal replacement.

Preventative overhaul schedule — every 4,000 hours or 2 years: For high‑use mining trucks and cranes, Sany recommends a full overhaul of the Sany Joint-Rotary every 4,000 operating hours or 2 years. Replace all four O‑rings as a set (A210609000287, A210609000117, A210609000220, A210609000268). Replace the TG oil seal (60023928), the star-shaped seal ring (60018184), and the guide ring (B230101001054). Inspect the core (10231717) and housing for scoring or wear—replace the entire Sany Joint-Rotary if any wear deeper than 0.2 mm is detected.

Keep a detailed maintenance log tracking fluid change dates, seal replacement history, and rotation test results. By following this proactive schedule, the Sany Joint-Rotary can reliably exceed 6,000 hours of service, maximizing equipment uptime and minimizing total cost of ownership.

The TG oil seal (60023928) is a double‑lip seal with a garter spring that maintains constant contact pressure on the rotating shaft. The primary lip seals the hydraulic fluid, while the secondary lip acts as a dust seal, preventing contaminants from entering the joint. If the TG seal fails, hydraulic fluid will leak externally and contaminants can enter, rapidly wearing the internal components. Symptoms of TG seal failure include visible oil dripping from the joint during rotation and evidence of fluid on the rotating housing surface.

The guide ring (B230101001054) is manufactured from a PTFE composite material with a low coefficient of friction. This component prevents the rotating core (10231717) from contacting the stationary housing during operation, eliminating metal‑to‑metal wear that would quickly destroy the joint. The guide ring is designed to absorb radial loads and maintain concentric alignment between the rotating and stationary halves. If the guide ring wears, the core may contact the housing, producing audible grinding or squeaking sounds during rotation.

For Sany mining trucks and cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Joint-Rotary. Use low‑viscosity hydraulic fluid (ISO VG 22) to ensure proper flow through the joint passages. Allow the engine to idle for 10‑15 minutes before rotating the cab or turntable, allowing the fluid to warm and the seals to become flexible. The TG oil seal remains flexible down to -40°C, but the O‑rings may be slower to compress—cycle rotation slowly several times before full operation.

The Sany Joint-Rotary is also available as part of a complete rotating hydraulic system overhaul kit, which includes the rotary joint assembly, all four O‑rings, the TG seal, the star-shaped seal ring, the guide ring, the copper ring, and all mounting fasteners. Sany recommends this complete‑kit approach for vehicles with over 6,000 operating hours, as it allows the entire rotating fluid transmission system to be renewed in a single service event, minimizing downtime and maximizing return on investment.

Fleet managers using this strategy report a 50% reduction in rotary joint‑related breakdowns and a 40% reduction in total hydraulic 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.