Tanım
TRUCK CRANE HYDRAULIC SYSTEMS · UNITED KINGDOM
Rear Outrigger Rack Cylinder — Behind Cylinder for Opening Rack Support
Engineered for precision outrigger deployment on truck-mounted cranes and aerial work vehicles, this hydraulic cylinder delivers controlled, reliable rack-opening force under demanding British industrial conditions.
What Is the Rear Outrigger Rack Cylinder?
The rear outrigger rack cylinder — officially designated the behind cylinder for opening rack support — is a compact, single-rod hydraulic actuator purpose-built to extend and retract the rear outrigger rack beam on truck-mounted cranes, aerial work platforms, and similar mobile lifting equipment. When the vehicle is parked on a jobsite, this cylinder pushes the rack outward to widen the crane’s support footprint, fundamentally improving machine stability before any load is lifted. The deployment action must be smooth, controllable, and repeatable across thousands of cycles, which is precisely what this unit is engineered to deliver. With a bore of 40 mm, a rod diameter of 25 mm, and a stroke of 635 mm, the cylinder operates at a rated working pressure of 12 MPa while maintaining structural integrity up to a maximum withstand pressure of 18 MPa — margins that reflect real-world shock loads experienced on British construction sites, port terminals, and utilities infrastructure projects.
Understanding the product code HCYY11112026 helps buyers quickly confirm specification fit: the bore-rod-stroke combination of Φ40 × Φ25 × 635 maps directly to common rear-outrigger mounting envelopes found across European truck-crane platforms. An installation distance of 840 mm allows for slight frame variation between vehicle generations without requiring custom bracketry, and the complete assembly weighs just 9 kg — a figure that matters to field engineers handling multiple swaps during planned maintenance shutdowns at UK depots.
Operating Principle and Internal Design
The cylinder operates on a straightforward double-acting hydraulic principle: pressurised oil enters the cap-end port to extend the rod, pushing the rack beam outward with controlled, measurable force; oil entering the rod-end port retracts the rod, pulling the rack back into its travel position before the vehicle moves. This bidirectional control is essential because inadvertent partial extension of a rack cylinder is one of the most common causes of outrigger-related crane incidents on worksites across England, Scotland, and Wales.
The internal architecture centres on a honed steel barrel machined to tight cylindricity tolerances, a hard-chrome-plated solid rod for corrosion resistance and seal longevity, and a composite piston seal package rated to withstand the 18 MPa proof-pressure requirement. End caps are threaded and torqued to specification rather than welded, enabling field-level seal replacement without specialist equipment. Precision-ground rod bearing bands maintain concentricity under the off-axis loads that rack-support geometry frequently introduces, preventing the rod-seal contact that causes early leakage in lower-grade units. The overall result is a cylinder that integrates cleanly into existing truck-crane hydraulic circuits operating at system pressures between 10 and 14 MPa — the dominant range across European OEM platforms.
Varil Malzemesi
Cold-drawn seamless steel tubing, honed to Ra 0.4 μm, for consistent seal performance and extended service life across 200,000+ cycles.
Piston Çubuğu
45# or 40Cr steel, hard-chrome plated to 20–30 μm, ground and polished. Resistant to the salt, grit, and dampness typical of UK outdoor operations.
Seal Package
Imported composite polyurethane and PTFE seals from Parker or equivalent. Rated for operating temperatures from -20°C to +100°C — handling British winter and summer extremes comfortably.
Surface Finish
External surfaces treated with industrial-grade epoxy primer and topcoat. Mount interfaces precision-machined for direct OEM bolt-up without shimming or rework.
Teknik Özellikler
Extracted directly from the manufacturer’s product datasheet. All values are factory-tested.
| Behind Cylinder for Opening Rack Support | ||||||
|---|---|---|---|---|---|---|
| Silindir Modeli | Teknik Özellikler | Çalışma Basıncı | Maksimum Dayanım Basıncı | Yolculuk (mm) | Montaj Mesafesi (mm) | Ağırlık |
| HCYY11112026 | Φ40 × Φ25 × 635 | 12 MPa | 18 MPa | 635 | 840 | 9 kg |
Key Performance Advantages
Pressure Safety Margin
A 50% safety margin between working pressure (12 MPa) and proof pressure (18 MPa) covers hydraulic surge events without component distortion or seal extrusion.
Compact 9 kg Assembly
Light enough for single-person installation during scheduled maintenance — no lifting equipment required on most UK truck-crane service bays.
Direct OEM Bolt-Up
An 840 mm installation distance accommodates standard European rear-outrigger frame spacing. No custom adaptor plates or machined interfaces are needed in most retrofit scenarios.
All-Weather Seal Integrity
Polyurethane and PTFE composite seals maintain zero-leak performance from sub-zero Scottish Highland winters to summer peak temperatures on southern English infrastructure sites.
Field-Serviceable Design
Threaded end caps and a modular seal kit mean depot engineers can rebuild cylinders in the field rather than sending complete assemblies back to the supplier, reducing vehicle downtime.
Chrome-Plated Rod Durability
Hard-chrome plating on the 25 mm rod resists the road salt, hydraulic fluid contamination, and abrasive grit that shorten conventional mild-steel rod life on UK outdoor crane fleets.
Application Scenarios Across the UK
Construction Sites
Tower block erection, steel frame assembly, and precast concrete placement across London, Manchester, Birmingham, and Edinburgh urban developments.
Port & Logistics
Container handling and ship-to-shore lifts at Felixstowe, Southampton, and Tilbury — environments where outrigger reliability is safety-critical.
Utilities & Energy
Transformer installation, wind turbine maintenance, and overhead line work on networks operated by National Grid and regional distribution companies throughout England and Wales.
Municipal Services
Emergency response, bridge inspection, and street furniture installation where mobile cranes must deploy and retract outriggers rapidly in constrained public spaces.
Full Truck Crane Cylinder Series
The rear outrigger rack cylinder is part of a comprehensive truck-crane hydraulic cylinder family covering boom extension, luffing, slewing, and outrigger actuation. Explore the full range to simplify your procurement and ensure cross-family compatibility.
Customer Success Cases
Real-world performance across demanding UK and European crane operations.
Infrastructure / Mobile Crane Fleet
Northern England Crane Hire Company — Outrigger Cylinder Fleet Refresh
A mobile crane hire operator based in Leeds, serving infrastructure contractors across Yorkshire and the North East, was experiencing recurring outrigger rack cylinder failures on a mixed fleet of 25–50-tonne truck cranes. Cylinders were lasting fewer than 18 months before developing rod seal leaks — primarily driven by road-salt contamination on the A-roads and motorway maintenance corridors where the fleet operated. After sourcing replacement HCYY11112026 units from Boom Cylinders, they retrofitted 14 machines over a single planned maintenance week. The hard-chrome rod specification and upgraded composite seals addressed the corrosion mechanism directly. Eighteen months post-installation, zero units have been returned for leakage failures. Total cost of ownership dropped significantly compared with their previous OEM-equivalent supplier’s parts, and lead times from our team were consistently inside 10 working days — critical for a hire business where machine downtime directly reduces revenue.
“We’ve been buying boom and outrigger cylinders from this team for three years. The HCYY11112026 is the best value-for-money rear rack cylinder we’ve tried — quality is consistently OEM-level and delivery to our Manchester depot is always reliable.”
“Ordered four units for our road-work crane fleet in the Midlands. Installation was straightforward — bolt-in replacement with no modification needed. The technical team answered our specification questions clearly before we placed the order, which gave us confidence.”
“Good product, honest pricing, and they were willing to discuss customising the rod end connection to match our older crane’s mounting pattern. That kind of flexibility is rare from international hydraulic suppliers.”
Manufacturing Facility & Custom Engineering Capability
Our production facility operates CNC turning centres, internal honing lines, and dedicated assembly bays for hydraulic cylinder production — all under a documented quality management system. Standard lead times for stock specifications such as the HCYY11112026 rear outrigger rack cylinder are 7–10 working days for quantities up to 20 units. For larger fleet orders, we discuss production scheduling with customers directly to align with planned maintenance windows.
Our engineering team accepts full custom specifications. UK buyers working with older crane models, bespoke outrigger geometries, or non-standard port arrangements can submit their drawings or dimensional requirements for a no-obligation feasibility review. We have produced modified bore/rod/stroke combinations, non-standard end connections, and cylinders with integrated position sensors for customers across the UK crane, utility, and marine-crane sectors. Whether you need 2 units or 200, our factory can accommodate one-off specials and repeat-run production alike. The product definition stays on file for future orders, simplifying reordering and ensuring dimensional consistency across a multi-year parts agreement.
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boom-cylinders.com | Specialist Truck Crane Hydraulic Cylinders | Serving the United Kingdom | edit by gzl
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