Crawler Crane Rack Support Cylinder | EP-HCYY11112022 Model
Crawler Crane Rack Support Cylinder
EP-HCYY11112022 · Φ70mm · Stroke 1,237mm · 20 MPa · 48 kg
The cylinder that extends and positions the outrigger rack structure on lattice boom crawler cranes. The rack support system widens the crane's footprint during lifting operations — increasing stability by distributing the ground bearing pressure across a larger area. At 48 kg with a 1,237 mm stroke, this cylinder deploys the opening rack from its folded transport position to its fully extended working configuration.
Technical Specifications
▲ Dimension Drawing
| Parameter | Specification |
|---|---|
| Product Name | Crawler Crane Rack Support Cylinder |
| Cylinder Model | EP-HCYY11112022 |
| Bore (D) | Φ70 mm |
| Rod (d) | Φ50 mm |
| Stroke (S) | 1,237 mm |
| Installation Distance (L) | 1,437 mm |
| Working Pressure | 20 MPa |
| Maximum Withstand Pressure | 30 MPa |
| Weight | 48 kg |
| Application | Lattice Boom Crawler Crane |
▲ Crawler Crane Rack Support Cylinder | EP-HCYY11112022 ModelHow Rack Support Cylinders Stabilise the Crawler Crane
Large crawler cranes operate near their tipping limits during heavy lifts. The opening rack support system extends outward from the crane's tracks, creating a wider base of support. The rack support cylinder pushes the rack structure from its folded position (for transport) to its deployed position (for lifting), adding several metres to the crane's effective track width.
The 1,237 mm stroke provides the full range of rack deployment — from fully folded to fully extended. The Φ70 bore at 20 MPa produces approximately 77 kN of extension force, sufficient to deploy the rack structure and hold it rigidly in position against the overturning moments generated during crane operation.
The 71.4% rod-to-bore ratio (Φ50/Φ70) provides a balance between push force (for deployment) and column strength (for holding the rack in position under side-loading). The cylinder must resist lateral forces from wind, ground slope, and dynamic load swings. Browse the full mobile machinery hydraulic cylinder range.
Rack Support: The Stability Margin That Enables Heavy Lifts
For road or site transport, the racks fold inward — the crawler crane fits within its track width. For lifting, the racks deploy outward — typically adding 2–4 metres per side. The cylinder makes this transition hydraulic and controlled.
By widening the base, the rack reduces the ground bearing pressure — preventing the crane from sinking into soft ground. On construction sites with poor soil conditions, the rack support is essential for safe crane operation.
The crawler crane uses multiple rack support cylinders — front and rear, left and right. The EP-HCYY11112022 is one variant; related models (EP-HCYY11112024, 26) serve front and behind positions with different mounting geometries.
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
"We replaced all 4 rack support cylinders on our 200-tonne crawler crane. The EP-HCYY11112022 deployed smoothly on first extension — the 1,237 mm stroke matches the original specification exactly. Crane passed its load test at full rack extension."
M. Petersen — Crane Operations Manager, Denmark
"At 48 kg, the rack support cylinder is manageable for a 2-person team with a chain hoist. Good quality chrome, tight seals. Cost approximately 35% below OEM price."
C. Nakamura — Equipment Buyer, Japan
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