Truck Crane Luffing Cylinder | EP-HCYY11112016 Model
Truck Crane Luffing Cylinder
EP-HCYY11112016 · Φ320mm · Stroke 4,000mm · 25 MPa · 3,500 kg
The largest and heaviest cylinder in the entire product range — and the single most critical actuator on a truck crane. The luffing cylinder raises and lowers the main boom through its full angular range, supporting the combined weight of the boom, the extension sections, the hook block, the wire rope, and the suspended load. At 3,500 kg, Φ320 bore, and 4,000 mm stroke, this is heavy-duty hydraulic engineering at its most demanding.
Technical Specifications
▲ Dimension Drawing
| Parameter | Specification |
|---|---|
| Product Name | Truck Crane Luffing Cylinder |
| Cylinder Model | EP-HCYY11112016 |
| Bore Diameter (D) | Φ320 mm |
| Rod Diameter (d) | Φ280 mm |
| Stroke (S) | 4,000 mm |
| Installation Distance (L) | 4,750 mm |
| Working Pressure | 25 MPa |
| Maximum Withstand Pressure | 37.5 MPa |
| Weight | 3,500 kg |
| Application | Truck-Mounted Crane |
▲ Truck Crane Luffing Cylinder | EP-HCYY11112016 ModelHow the Luffing Cylinder Controls the Main Boom
The luffing cylinder connects the crane superstructure to the boom base, converting hydraulic pressure into the angular force needed to raise (luff up) or lower (luff down) the main boom. As the boom angle increases from horizontal toward vertical, the geometric advantage changes — requiring different forces at different angles.
At Φ320 bore and 25 MPa, the cylinder produces approximately 2,011 kN (205 tonnes) of push force — enough to raise a fully extended boom with its maximum rated load from horizontal to near-vertical. The 87.5% rod ratio (Φ280/Φ320) means the rod is almost as thick as the bore — providing the column strength needed to push the 4,000 mm stroke under the massive bending moments generated by the boom's cantilever weight.
The 37.5 MPa maximum withstand pressure (1.5× working) accounts for dynamic overloads: sudden load release when the hook snags and releases, wind gusts on the extended boom, and emergency stops during luffing. The cylinder must survive these transients without seal failure or structural damage. Browse the full mobile machinery hydraulic cylinder range.
Luffing Cylinder: The Biggest Numbers in the Catalogue
Installing or replacing this cylinder requires a separate mobile crane. The cylinder itself is a structural steel assembly — the wall thickness at Φ320 bore and 25 MPa is substantial. Handling, shipping, and installation all require heavy-lift planning.
The stroke covers the boom's entire angular range from near-horizontal to near-vertical. The rod extends over 4 metres — requiring exceptional chrome quality and straightness across the full length to maintain seal integrity.
At 25 MPa, the Φ320 bore area produces over 200 tonnes of force. This is the force needed to raise a fully loaded boom — including the boom self-weight, extension sections, wire ropes, hook block, and the rated load — against gravity.
Key Advantages
- Φ320 bore — the largest in the product range — produces 2,011 kN (205 tonnes) of luffing force at 25 MPa working pressure.
- 25 MPa / 37.5 MPa pressure rating — 1.5× safety factor for the dynamic loads of boom luffing with suspended loads.
- Holding valve for boom position lock — the boom stays at any set angle without continuous hydraulic pressure. Load-holding prevents uncontrolled boom lowering under system failure.
- ⚡ 4,000 mm stroke — covers the full angular range of the main boom from near-horizontal to near-vertical luffing positions.
- ️ 87.5% rod ratio — the Φ280 rod provides column strength for the 4-metre extended push under massive cantilever loads.
Truck Crane Cylinder Family
Spring Cyl. Φ63, 5kg
Anti-Tilt Cyl. Φ190, 590kg
Pin Cyl. Φ80, 18kg
Luffing Cyl. Φ320, 3500kg
Counterweight Cyl. Φ200, 55kg
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
"The luffing cylinder is the heart of a truck crane. We replaced the EP-HCYY11112016 on our 250-tonne crane — installation required a 60-tonne assist crane. After 12 months of heavy use, the boom luffs smoothly with zero drift at any angle."
M. Dubois — Heavy Lift Director, France
"We bench-tested the cylinder at 37.5 MPa for 20 minutes — zero leakage. The Φ280 rod chrome finish is flawless across the full 4-metre length. At 3,500 kg, this is serious hardware — the quality matches the scale."
J. Eriksson — Chief Engineer, Sweden
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