Crawler Crane Luffing Cylinder | EP-HCYY11112018 Model
Crawler Crane Luffing Cylinder
EP-HCYY11112018 · Φ280mm · Stroke 3,507mm · 31.5 MPa · 1,155 kg
The main boom luffing actuator for lattice boom crawler cranes — one of the heaviest and highest-pressure cylinders in the mobile crane industry. At 1,155 kg with a Φ280 bore operating at 31.5 MPa, this cylinder raises and lowers the lattice boom through its full angular range, supporting the combined weight of the boom sections, pendant ropes, hook block, and suspended load on cranes rated at 100+ tonnes lifting capacity.
Technical Specifications
▲ Dimension Drawing
| Parameter | Specification |
|---|---|
| Product Name | Crawler Crane Luffing Cylinder |
| Cylinder Model | EP-HCYY11112018 |
| Bore (D) | Φ280 mm |
| Rod (d) | Φ250 mm |
| Stroke (S) | 3,507 mm |
| Installation Distance (L) | 4,218 mm |
| Working Pressure | 31.5 MPa |
| Maximum Withstand Pressure | 39 MPa |
| Weight | 1,155 kg |
| Application | Lattice Boom Crawler Crane |
▲ Crawler Crane Luffing Cylinder | EP-HCYY11112018 ModelHow the Luffing Cylinder Controls a Lattice Boom
A crawler crane's lattice boom can extend 50–100+ metres in length, constructed from interlocking steel lattice sections. The luffing cylinder connects the crane's revolving superstructure to the boom foot, converting hydraulic pressure into the angular force needed to raise the boom from near-horizontal (maximum radius, minimum height) to near-vertical (minimum radius, maximum height).
The 89.3% rod-to-bore ratio (Φ250/Φ280) reveals this cylinder's primary function: it works predominantly in tension — pulling the boom upward against gravity. The thick Φ250 rod provides the tensile cross-section needed to suspend a lattice boom assembly that can weigh 50+ tonnes. The 3,507 mm stroke spans the boom's full angular range from approximately 30° to 85° from horizontal.
At 31.5 MPa working pressure — significantly higher than the truck crane luffing cylinder (25 MPa) — this cylinder produces approximately 1,943 kN of force. The 39 MPa burst rating (1.24× safety factor) reflects the crawler crane industry's tighter pressure margins, where every kilogram of cylinder weight affects the crane's lifting capacity at the boom tip. Browse the full mobile machinery hydraulic cylinder range.
Crawler Crane vs Truck Crane Luffing Cylinder
The crawler crane luffing cylinder operates at 31.5 MPa vs 25 MPa for the truck crane version. Higher pressure produces equivalent force from a smaller bore — the Φ280 bore is smaller than the truck crane's Φ320, saving weight that directly translates to additional lifting capacity.
The Φ250 rod inside the Φ280 bore is almost entirely rod — designed for tensile loading as the cylinder pulls the boom upward. The small annular area limits oil flow for precise, controlled boom movement at altitude.
Despite operating at higher pressure, the crawler crane luffing cylinder is one-third the weight of the truck crane version — because every kilogram on the superstructure reduces the net lifting capacity at the boom tip. Weight optimisation is critical in crawler crane design.
Crawler Crane Cylinder Family
Korea Ever-Power manufactures 8+ cylinder models for lattice boom crawler cranes — luffing, rack support, frame support, boom angle, and supplementary bracing cylinders:
Luffing Cyl. Φ280, 1155kg
Rack Support Cyl. Φ70, 48kg
Frame Support Cyl. Φ140, 123kg
Boom Angle + Additional Support (5 models)
Why Choose Korea Ever-Power
Korea Ever-Power is a professional hydraulic cylinder manufacturer and supplier, specialising in forklift hydraulic cylinders, aerial work vehicle cylinders, mobile machinery cylinders, offshore cylinders, and industrial engineering cylinders. Our production facilities are equipped with composite machining centres, multi-station welding robots, automated assembly lines, specialised cylinder testing machines, and a dedicated quality inspection area — ensuring every cylinder meets OEM-grade performance standards.
Korea Ever-Power forklift tilt cylinders are manufactured to the same specifications and quality standards as original equipment cylinders fitted to major forklift brands worldwide. Every cylinder is 100% hydrostatic pressure tested, dimensionally inspected, and shipped with a test certificate and seal kit. Contact the Korea Ever-Power team for pricing and lead time.
Frequently Asked Questions
What Our Customers Say
"Replaced the luffing cylinder on our 150-tonne crawler crane. Korea Ever-Power delivered the EP-HCYY11112018 with full 39 MPa pressure test certification. After 10 months of heavy lattice boom work, zero drift and zero leakage."
A. Volkov — Heavy Crane Director, Russia
"The 31.5 MPa operating pressure matches our crane's original specification exactly. At 1,155 kg, handling required our 30-tonne assist crane. Chrome quality across the 3.5-metre rod is excellent — uniform finish, no defects."
L. Berger — Crane Service Engineer, Germany
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