Truck Crane Spring Cylinder | EP-HCYY11112013 Model
Truck Crane Spring Cylinder
EP-HCYY11112013 · Φ63mm · Stroke 25mm · 20 MPa · 5 kg
The smallest cylinder on a truck crane — but one with a critical function. The spring cylinder provides a controlled return force within the boom support mechanism, ensuring consistent boom positioning and smooth operation during crane setup and teardown. At only 5 kg and 267 mm installation distance, it fits into tight spaces within the crane superstructure.
Technical Specifications
▲ Dimension Drawing
| Parameter | Specification |
|---|---|
| Product Name | Truck Crane Spring Cylinder |
| Cylinder Model | EP-HCYY11112013 |
| Bore Diameter (D) | Φ63 mm |
| Rod Diameter (d) | Φ32 mm |
| Stroke (S) | 25 mm |
| Installation Distance (L) | 267 mm |
| Working Pressure | 20 MPa |
| Maximum Withstand Pressure | 30 MPa |
| Weight | 5 kg |
| Application | Truck-Mounted Crane |
▲ Truck Crane Spring Cylinder | EP-HCYY11112013 ModelHow the Spring Cylinder Functions in the Crane Boom System
The spring cylinder sits within the boom support mechanism, providing a controlled hydraulic spring force. Unlike a mechanical spring, the hydraulic spring cylinder delivers a precise, adjustable return force — maintaining constant tension on the boom support linkage regardless of temperature, wear, or operating angle.
With only 25 mm of stroke, this is a short-travel actuator designed for force application rather than displacement. The Φ63 bore at 20 MPa produces approximately 62 kN of force through this minimal stroke — more than sufficient for the spring function in the boom support.
The compact 267 mm installation distance allows the cylinder to fit within the confined geometry of the boom pivot area, where space is limited by the boom hinge pins, hydraulic routing, and structural members. Browse the full mobile machinery hydraulic cylinder range.
Why Hydraulic Spring Instead of Mechanical Spring?
Adjustable Force
The hydraulic pressure can be set precisely via a relief valve — the spring force is tunable for different boom configurations and load conditions. A mechanical spring has fixed characteristics that change with temperature and fatigue.
Compact Envelope
A mechanical spring producing 62 kN of force would require a much larger installation volume. The hydraulic cylinder delivers the same force in a 267 mm package with Φ63 mm diameter.
Damping Capability
The hydraulic oil provides inherent damping — absorbing shock loads and vibrations. A mechanical spring would transmit these directly to the boom structure, accelerating fatigue at the pivot points.
Key Advantages
- Ultra-compact: 267 mm × Φ63 mm — fits within the confined boom pivot area alongside hydraulic lines, hinge pins, and structural members.
- 20 MPa / 30 MPa rating — 1.5× safety factor handles dynamic loads from boom oscillation and wind gusts during crane operation.
- ⚡ Only 5 kg — the lightest cylinder in the truck crane family. Adds negligible weight to the boom assembly.
- 25 mm precision stroke — short-travel design for force application. The minimal stroke ensures rapid response and precise force control.
- ️ Hard-chrome rod — even the shortest-stroke cylinders benefit from precision rod finishing for seal longevity in the vibration-heavy crane environment.
Truck Crane Cylinder Family
EP-HCYY11112013 ← this product
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
"Replaced spring cylinders on 3 truck cranes. The 5 kg weight and 267 mm length made the swap easy — 20 minutes per cylinder. Boom support tension is consistent across all operating angles."
K. Novak — Crane Technician, Czech Republic
"Good quality, competitive price. The hydraulic spring force is smoother and more consistent than the mechanical springs we replaced. Boom oscillation during setup has noticeably decreased."
S. Popov — Service Engineer, Bulgaria
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