Crawler Crane Frame Support Cylinder | EP-HCYY11112023 Model
Crawler Crane Frame Support Cylinder
EP-HCYY11112023 · Φ140mm · Stroke 640mm · 30 MPa · 40 MPa Max · 123 kg
The highest-pressure cylinder in the crawler crane family — operating at 30 MPa working and 40 MPa maximum withstand pressure. The frame support cylinder provides structural bracing for the main crane frame, locking the frame structure in its deployed configuration during lifting operations. At Φ140 bore with an 85.7% rod ratio, this cylinder functions as a hydraulically actuated structural member that can be extended for operation and retracted for transport.
Technical Specifications
▲ Dimension Drawing
| Parameter | Specification |
|---|---|
| Product Name | Crawler Crane Frame Support Cylinder |
| Cylinder Model | EP-HCYY11112023 |
| Bore (D) | Φ140 mm |
| Rod (d) | Φ120 mm |
| Stroke (S) | 640 mm |
| Installation Distance (L) | 983 mm |
| Working Pressure | 30 MPa |
| Maximum Withstand Pressure | 40 MPa |
| Weight | 123 kg |
| Application | Lattice Boom Crawler Crane |
▲ Crawler Crane Frame Support Cylinder | EP-HCYY11112023 ModelHow the Frame Support Cylinder Braces the Crane Structure
The crawler crane frame must be rigid during lifting — any flexibility in the frame allows the superstructure to twist or deflect under eccentric loads, reducing both stability and lifting capacity. The frame support cylinder locks the frame in its extended configuration, acting as a rigid strut between frame members.
At 30 MPa working pressure and 40 MPa maximum — the highest pressure rating in the entire crawler crane range — this cylinder must withstand the full structural loads transmitted through the crane frame during heavy lifts. The 1.33× safety factor (30→40 MPa) is tighter than typical hydraulic cylinders because the frame support operates primarily as a static structural member, not a dynamic actuator.
The 85.7% rod ratio (Φ120/Φ140) confirms this is a column/strut cylinder — the thick rod carries compressive loads transmitted through the frame structure. The 640 mm stroke provides the deployment range needed to extend the frame bracing from its folded transport position. Browse the full mobile machinery hydraulic cylinder range.
30 MPa / 40 MPa — Why the Highest Pressure?
The frame support cylinder is part of the crane's structural load path — it transmits overturning moments, torsional loads, and dynamic forces from the superstructure through the frame to the tracks. The cylinder must be as strong as a steel strut of the same cross-section.
The Φ120 rod inside the Φ140 bore leaves only 10 mm of wall thickness — this cylinder is essentially a solid steel column with a thin hydraulic sleeve around it. The hydraulics are only needed for extension/retraction; during operation, it functions as a rigid mechanical member.
The 40 MPa maximum withstand pressure accounts for the extreme transient loads that can occur during seismic events, sudden load release, or emergency swing stops. The frame support must survive these peak loads without failure.
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
"The frame support cylinders on our crawler crane had started weeping oil — a serious safety concern for a structural member. Korea Ever-Power's EP-HCYY11112023 replacements passed our 40 MPa proof test without issue. The 123 kg weight required a small chain hoist for installation."
T. Hoffmann — Crane Safety Inspector, Austria
"Good quality at competitive pricing. The Φ140 bore and 30 MPa rating match our original crane specification. Chrome finish on the Φ120 rod is clean — important for a cylinder that sits exposed to weather during crane setup periods."
S. Kim — Heavy Equipment Procurement, South Korea
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