Sany Telescopic Boom Oil Cylinder

The Sany Telescopic Boom Oil Cylinder is a precision hydraulic actuator engineered to deliver powerful and controlled extension and retraction forces for multi-section telescopic booms on Sany truck cranes, all-terrain cranes, and heavy lifting equipment.

This Sany Telescopic Boom Oil Cylinder integrates a robust cylinder assembly, precision-machined piston and piston rod, a comprehensive multi-layer sealing system, guide rings, retainer rings, and all necessary 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 Telescopic Boom Oil Cylinder is specifically designed for Sany STC‑series and SAC‑series cranes with 4‑section or 5‑section telescopic booms, ensuring smooth, synchronized boom movement under full rated loads and harsh working conditions.

Sany Telescopic Boom Oil Cylinder — OEM hydraulic telescoping cylinder assembly for Sany heavy truck cranes and all‑terrain cranes

What is the Sany Telescopic Boom Oil Cylinder?

The Sany Telescopic Boom Oil Cylinder is a complete OEM hydraulic actuator that provides the primary motive force for extending and retracting the telescoping sections of Sany heavy lifting booms. This cylinder is the heart of the telescoping system, converting hydraulic pressure into linear mechanical force to move boom sections in and out.

The Sany Telescopic Boom Oil Cylinder comprises 22 precision‑engineered components that function as an integrated actuation unit. The cylinder assembly houses a precision‑machined piston connected to a hardened piston rod. Multiple guide rings maintain concentricity, while a comprehensive multi‑layer sealing system prevents internal and external leakage.

The Sany Telescopic Boom Oil Cylinder incorporates a sophisticated sealing system with MPS‑rings, CRGS seals, dustproof rings, and anti‑pollution loops that work together to prevent fluid bypass and maintain system pressure. The cylinder body is manufactured from high‑strength steel with a honed internal surface that ensures smooth piston movement and extends seal life.

The Sany Telescopic Boom Oil Cylinder is a direct replacement for worn or damaged telescoping cylinders on Sany STC‑series and SAC‑series cranes. By using this genuine assembly, you ensure that the cylinder bore diameter, stroke length, and mounting dimensions match factory specifications, eliminating synchronization issues and structural stress.

Product Parameters of Sany Telescopic Boom Oil Cylinder

Technical specifications: The Sany Telescopic Boom Oil Cylinder is engineered for operating pressures up to 35 MPa (5,075 psi), matching Sany STC and SAC series crane hydraulic system requirements. The cylinder body is fabricated from high‑strength seamless steel tubing with a honed internal surface finish of 0.2 μm Ra, minimizing seal wear and reducing internal friction.

The piston rod assembly (10057371) is manufactured from high‑quality steel with induction hardening and nickel‑chromium composite plating for superior wear and corrosion resistance. The cylinder incorporates multiple guide rings that maintain piston concentricity within 0.1 mm, preventing metal‑to‑metal contact and absorbing side loads.

All components of the Sany Telescopic Boom Oil Cylinder 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 Telescopic Boom Oil Cylinder?

Complete 22‑Component OEM Kit — Perfectly Matched Components: The Sany Telescopic Boom Oil Cylinder includes every component as a single, factory‑matched assembly. The cylinder assembly, piston, piston rod, guide rings, sealing rings, retainer rings, and all fasteners are precisely matched at the factory to ensure optimal performance and reliability.

Multi‑Layer Sealing System for Zero Leakage: The Sany Telescopic Boom Oil Cylinder uses a comprehensive sealing configuration with MPS‑rings, CRGS seals, dustproof rings, and anti‑pollution loops that provide redundant sealing protection. This multi‑layer approach prevents fluid bypass across the piston and eliminates external leakage, maintaining cylinder efficiency and system pressure over thousands of operating hours.

Superior Wear Resistance with Hardened Piston Rod: The Sany Telescopic Boom Oil Cylinder features a piston rod that undergoes high‑frequency quenching and nickel‑chromium composite plating. This advanced surface treatment provides exceptional wear resistance against scoring and pitting, extending cylinder service life even in dusty crane environments.

Fleet‑Proven Reliability and Comprehensive Warranty: The Sany Telescopic Boom Oil Cylinder is standard equipment on Sany STC‑series and SAC‑series cranes in over 100 countries. Fleet data shows that genuine Sany telescoping cylinders deliver an average service life exceeding 10,000 hours—three times longer than generic aftermarket cylinders—while eliminating internal leakage and seal failure incidents. The assembly is backed by a 24‑month manufacturer’s warranty covering seal integrity, weld quality, and rod scoring. Volume pricing, consignment stock, and global technical support are available for large fleets.

What are the Routine Maintenance Considerations for the Sany Telescopic Boom Oil Cylinder?

Daily visual inspection before operation: Before each shift, inspect the Sany Telescopic Boom Oil Cylinder for visible hydraulic leaks around the rod seal, cylinder head, and all fitting connections. Check the piston rod for any signs of scoring, pitting, or chrome flaking. Inspect all mounting bolts and retainer rings for signs of loosening. Any external leak indicates seal wear and requires immediate attention—a leaking cylinder will lose lifting capacity and may fail under load.

Hydraulic fluid quality and filtration — every 500‑1,000 hours: The Sany Telescopic Boom Oil Cylinder requires hydraulic fluid cleanliness of ISO 4406:2017 code 18/16/13 or better. Contaminated fluid is the leading cause of seal wear, guide ring damage, and cylinder scoring. Take fluid samples every 1,000 hours for particle count analysis. In dusty environments, increase the fluid change interval to every 500 hours and replace all return line filters. Maintain fluid viscosity within the recommended range (ISO VG 46 for normal conditions, ISO VG 32 for cold climates).

Cylinder performance test — every 1,000 operating hours: Test the Sany Telescopic Boom Oil Cylinder by extending the boom fully and observing the extension speed and smoothness. If the cylinder extends more slowly than normal or if the boom drifts downward with the control valve in neutral, internal piston seal bypass or holding valve leakage is indicated. If cylinder response is sluggish, check the hydraulic fluid level and inspect the suction filter for blockage.

Preventative overhaul schedule — every 4,000 hours or 2 years: For high‑use cranes, Sany recommends a full overhaul of the Sany Telescopic Boom Oil Cylinder every 4,000 operating hours or 2 years. Replace all sealing components including the MPS‑ring, CRGS seal, dustproof ring, and anti‑pollution loop. Inspect the piston rod for scoring; if scoring exceeds 0.2 mm, replace the cylinder assembly. Replace all retaining rings (10250741, 10250757) as a set. Keep a detailed maintenance log tracking fluid change dates, seal replacement history, and cylinder test results. By following this proactive schedule, the Sany Telescopic Boom Oil Cylinder can reliably exceed 10,000 operating hours.

The cylinder assembly (10057353) is the primary structural component of the Sany Telescopic Boom Oil Cylinder. This component is manufactured from high‑strength seamless steel tubing using a cold‑drawing process, followed by precision honing to achieve an internal surface finish of 0.2 μm Ra. The honing process ensures a smooth surface that minimizes seal wear and extends the service life of the guide rings and sealing elements. If the cylinder bore shows scoring or wear beyond 0.05 mm, the entire cylinder assembly must be replaced—honing the bore in the field is not recommended, as it may compromise the dimensional accuracy of the cylinder tube.

The piston (10057342) is precision‑machined from high‑strength steel with multiple sealing grooves that accommodate the O‑rings and seal rings. The piston is designed with an integral wear ring groove that accepts guide rings (B230101001722, B230101001322, 60053019, A880803040011, B230101002249), which prevent metal‑to‑metal contact between the piston and the cylinder bore. These guide rings are critical for absorbing side loads during cylinder operation. If a guide ring wears, the piston may contact the bore directly, causing rapid scoring and eventual cylinder failure.

The sealing system of the Sany Telescopic Boom Oil Cylinder uses multiple advanced sealing elements including the MPS‑ring (B230101001208) and the CRGS seal ring (A880806030016) that provide the primary dynamic seal between the piston and the cylinder bore. These seals are manufactured from high‑performance polyurethane compounds that resist extrusion and maintain sealing integrity even under extreme pressure spikes. The dustproof ring (B230101000428) prevents contaminants from entering the cylinder, while the anti‑pollution loop (B230101001561) provides additional protection against external contamination.

For Sany cranes operating in extreme cold climates (below -25°C), special considerations apply to the Sany Telescopic Boom Oil Cylinder. Use low‑viscosity hydraulic fluid (L‑HV22 or L‑HV32) to ensure adequate flow and pilot pressure during cold starts. The sealing compounds in the MPS‑ring and CRGS seal remain flexible down to -40°C, but the cylinder may extend more slowly until the fluid warms. Cycle the boom slowly several times before full operation to warm the cylinder and seals. Avoid shock loading the cylinder in cold conditions, as the piston rod may be more prone to brittle fracture at low temperatures.

The Sany Telescopic Boom Oil Cylinder is also available as part of a complete telescoping boom system overhaul kit, which includes the cylinder assembly, all sealing components, guide rings, retainer rings, and the telescoping rope set. Sany recommends this complete‑kit approach for vehicles with over 8,000 operating hours, as it allows the entire telescoping system to be renewed in a single service event, eliminating the risk of hidden seal wear or guide ring damage that could affect synchronization and lifting safety.

Fleet managers using this strategy report a 50% reduction in telescoping cylinder‑related breakdowns and a 40% reduction in total boom system 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.