Truck Crane Pin Cylinder | EP-HCYY11112015 Model
Truck Crane Pin Cylinder
EP-HCYY11112015 · Φ80mm · Stroke 225mm · 20 MPa · 18 kg
The cylinder that locks and unlocks the telescoping boom sections. During boom extension, the pin cylinder inserts locking pins into alignment holes — mechanically connecting adjacent boom sections so they move as a single structural member. During retraction, the pin cylinder retracts the pins, releasing the sections for sequential telescoping.
Technical Specifications
▲ Dimension Drawing
| Parameter | Specification |
|---|---|
| Product Name | Truck Crane Pin Cylinder |
| Cylinder Model | EP-HCYY11112015 |
| Bore Diameter (D) | Φ80 mm |
| Rod Diameter (d) | Φ40 mm |
| Stroke (S) | 225 mm |
| Installation Distance (L) | 440 mm |
| Working Pressure | 20 MPa |
| Maximum Withstand Pressure | 30 MPa |
| Weight | 18 kg |
| Application | Truck-Mounted Crane |
▲ Truck Crane Pin Cylinder | EP-HCYY11112015 ModelHow Pin Cylinders Enable Boom Telescoping
A telescoping truck crane boom consists of multiple nested sections that slide inside each other. To extend the boom, one section must be pinned (locked) while the adjacent section extends hydraulically. The pin cylinder inserts a hardened steel pin through matching holes in adjacent sections — creating a temporary rigid connection.
The 225 mm stroke provides enough travel to fully insert and retract the locking pin through the boom section wall thickness — typically two walls (inner and outer section) of 15–25 mm each, plus clearance. The Φ80 bore at 20 MPa produces approximately 100 kN of insertion force — enough to drive the pin through under misalignment or contamination conditions.
Pin cylinders must be extremely reliable — a pin that fails to insert leaves the boom section unlocked, which can lead to uncontrolled boom collapse under load. A pin that fails to retract prevents boom retraction for transport. Both failure modes are operationally critical. Browse the full mobile machinery hydraulic cylinder range.
Why Pin Reliability Is Non-Negotiable
Boom sections flex under load — the pin holes may not align perfectly. The 20 MPa pressure and Φ80 bore provide enough force to drive the pin through slightly misaligned holes without jamming.
Construction site dust, rust, and debris can accumulate in pin bores between operations. The cylinder must push through contamination reliably — every time, in every condition.
Most truck cranes include proximity sensors on the pin cylinder to confirm pin insertion before allowing boom loading. The cylinder's stroke must be precise and repeatable to trigger these sensors correctly.
Key Advantages
- 225 mm stroke for full pin engagement — enough travel to insert the locking pin through both boom section walls with clearance for misalignment and wear.
- 20 MPa / 30 MPa rating — the 100 kN insertion force drives pins through misaligned holes and contaminated bores.
- ⚡ 18 kg manageable weight — light enough for single-technician handling during maintenance, while robust enough for the forces involved.
- 440 mm installation distance — compact enough to fit within the boom section overlap zone.
- ️ Repeatable stroke for sensor compatibility — consistent stroke length ensures reliable pin position feedback to the crane's safety interlock system.
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
"Pin cylinders are the most replaced cylinder on our crane fleet — they cycle thousands of times during boom telescoping. Korea Ever-Power's EP-HCYY11112015 has been running 14 months without a pin insertion failure."
T. Lindgren — Crane Fleet Manager, Sweden
"The 225 mm stroke accommodates the slight misalignment in our older boom sections — the original shorter-stroke cylinders sometimes jammed. The Korea Ever-Power cylinders insert cleanly every time."
N. Al-Rashid — Crane Operator, UAE
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