{"id":1606,"date":"2026-09-09T05:16:50","date_gmt":"2026-09-09T05:16:50","guid":{"rendered":"https:\/\/boom-cylinders.com\/?post_type=product&p=1606"},"modified":"2026-09-09T09:18:56","modified_gmt":"2026-09-09T09:18:56","slug":"hcyy11112026-rear-outrigger-rack-cylinder","status":"publish","type":"product","link":"https:\/\/boom-cylinders.com\/fi\/product\/hcyy11112026-rear-outrigger-rack-cylinder\/","title":{"rendered":"Takatukijalan telineen sylinteri"},"content":{"rendered":"
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TRUCK CRANE HYDRAULIC SYSTEMS \u00b7 UNITED KINGDOM<\/p>\n

Rear Outrigger Rack Cylinder \u2014 Behind Cylinder for Opening Rack Support<\/h2>\n

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.<\/p>\n

Pyyd\u00e4 tarjous \u2014 sales@boom-cylinders.com<\/a><\/div>\n<\/div>\n<\/div>\n

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What Is the Rear Outrigger Rack Cylinder?<\/h2>\n

\"BehindThe rear outrigger rack cylinder \u2014 officially designated the behind cylinder for opening rack support \u2014 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 \u2014 margins that reflect real-world shock loads experienced on British construction sites, port terminals, and utilities infrastructure projects.<\/p>\n

Understanding the product code HCYY11112026 helps buyers quickly confirm specification fit: the bore-rod-stroke combination of \u03a640 \u00d7 \u03a625 \u00d7 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 \u2014 a figure that matters to field engineers handling multiple swaps during planned maintenance shutdowns at UK depots.<\/p>\n<\/div>\n<\/div>\n

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Operating Principle and Internal Design<\/h2>\n

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.<\/p>\n

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 \u2014 the dominant range across European OEM platforms.<\/p>\n<\/div>\n<\/div>\n

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\u2699<\/div>\n

Barrel Material<\/h3>\n

Cold-drawn seamless steel tubing, honed to Ra 0.4 \u03bcm, for consistent seal performance and extended service life across 200,000+ cycles.<\/p>\n<\/div>\n

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\ud83d\udd30<\/div>\n

Piston Rod<\/h3>\n

45# or 40Cr steel, hard-chrome plated to 20\u201330 \u03bcm, ground and polished. Resistant to the salt, grit, and dampness typical of UK outdoor operations.<\/p>\n<\/div>\n

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\ud83d\udd12<\/div>\n

Seal Package<\/h3>\n

Imported composite polyurethane and PTFE seals from Parker or equivalent. Rated for operating temperatures from -20\u00b0C to +100\u00b0C \u2014 handling British winter and summer extremes comfortably.<\/p>\n<\/div>\n

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\ud83c\udf1f<\/div>\n

Surface Finish<\/h3>\n

External surfaces treated with industrial-grade epoxy primer and topcoat. Mount interfaces precision-machined for direct OEM bolt-up without shimming or rework.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Tekniset tiedot<\/h2>\n

Extracted directly from the manufacturer’s product datasheet. All values are factory-tested.<\/p>\n

\n\n\n\n\n\n\n
Behind Cylinder for Opening Rack Support<\/th>\n<\/tr>\n
Sylinterimalli<\/th>\nTekniset tiedot<\/th>\nTy\u00f6paine<\/th>\nMaksimaalinen paineenkest\u00e4vyys<\/th>\nMatka (mm)<\/th>\nAsennuset\u00e4isyys (mm)<\/th>\nPaino<\/th>\n<\/tr>\n<\/thead>\n
HCYY11112026<\/td>\n\u03a640 \u00d7 \u03a625 \u00d7 635<\/td>\n12 MPa<\/td>\n18 MPa<\/td>\n635<\/td>\n840<\/td>\n9 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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\"Technical<\/div>\n<\/div>\n<\/div>\n

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Key Performance Advantages<\/h2>\n
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\u25cf<\/div>\n

Pressure Safety Margin<\/h4>\n

A 50% safety margin between working pressure (12 MPa) and proof pressure (18 MPa) covers hydraulic surge events without component distortion or seal extrusion.<\/p>\n<\/div>\n

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\u25cf<\/div>\n

Compact 9 kg Assembly<\/h4>\n

Light enough for single-person installation during scheduled maintenance \u2014 no lifting equipment required on most UK truck-crane service bays.<\/p>\n<\/div>\n

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\u25cf<\/div>\n

Direct OEM Bolt-Up<\/h4>\n

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.<\/p>\n<\/div>\n

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\u25cf<\/div>\n

All-Weather Seal Integrity<\/h4>\n

Polyurethane and PTFE composite seals maintain zero-leak performance from sub-zero Scottish Highland winters to summer peak temperatures on southern English infrastructure sites.<\/p>\n<\/div>\n

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\u25cf<\/div>\n

Kentt\u00e4k\u00e4ytt\u00f6inen suunnittelu<\/h4>\n

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.<\/p>\n<\/div>\n

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\u25cf<\/div>\n

Chrome-Plated Rod Durability<\/h4>\n

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.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Application Scenarios Across the UK<\/h2>\n
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\ud83c\udfed<\/div>\n

Construction Sites<\/h4>\n

Tower block erection, steel frame assembly, and precast concrete placement across London, Manchester, Birmingham, and Edinburgh urban developments.<\/p>\n<\/div>\n

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\u26fd<\/div>\n

Port & Logistics<\/h4>\n

Container handling and ship-to-shore lifts at Felixstowe, Southampton, and Tilbury \u2014 environments where outrigger reliability is safety-critical.<\/p>\n<\/div>\n

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\u26a1<\/div>\n

Utilities & Energy<\/h4>\n

Transformer installation, wind turbine maintenance, and overhead line work on networks operated by National Grid and regional distribution companies throughout England and Wales.<\/p>\n<\/div>\n

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\ud83d\ude97<\/div>\n

Municipal Services<\/h4>\n

Emergency response, bridge inspection, and street furniture installation where mobile cranes must deploy and retract outriggers rapidly in constrained public spaces.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Full Truck Crane Cylinder Series<\/h2>\n

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.<\/p>\n

\"Complete<\/div>\n
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\ud83d\udd17 Heavy-Duty Main Boom Extension Cylinder (815mm Stroke)<\/a><\/div>\n
HCYY11112009 \u2014 For primary boom extension on truck-mounted cranes<\/div>\n

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\ud83d\udd17 Folding Boom Angle Cylinder for Aerial Work Vehicle (1458mm Stroke)<\/a><\/div>\n
HCYY11112011 \u2014 For knuckle-boom angle control on aerial work platforms<\/div>\n

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Customer Success Cases<\/h2>\n

Real-world performance across demanding UK and European crane operations.<\/p>\n

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UK CASE STUDY<\/span>
\nInfrastructure \/ Mobile Crane Fleet<\/span><\/div>\n

Northern England Crane Hire Company \u2014 Outrigger Cylinder Fleet Refresh<\/h3>\n

\"Behind<\/p>\n

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\u201350-tonne truck cranes. Cylinders were lasting fewer than 18 months before developing rod seal leaks \u2014 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 \u2014 critical for a hire business where machine downtime directly reduces revenue.<\/p>\n

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18mo+<\/div>\n
Zero failures post-retrofit<\/div>\n<\/div>\n
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14<\/div>\n
Machines retrofitted<\/div>\n<\/div>\n
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<10 days<\/div>\n
Consistent lead time<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605\u2605<\/div>\n

“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 \u2014 quality is consistently OEM-level and delivery to our Manchester depot is always reliable.”<\/p>\n

\u2014 Fleet Maintenance Manager<\/div>\n
Mobile crane hire, Greater Manchester<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Ordered four units for our road-work crane fleet in the Midlands. Installation was straightforward \u2014 bolt-in replacement with no modification needed. The technical team answered our specification questions clearly before we placed the order, which gave us confidence.”<\/p>\n

\u2014 Workshop Supervisor<\/div>\n
Infrastructure contractor, West Midlands<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605\u2605<\/div>\n

“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.”<\/p>\n

\u2014 Procurement Specialist<\/div>\n
Port crane services, Humber Estuary<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Manufacturing Facility & Custom Engineering Capability<\/h2>\n

Our production facility operates CNC turning centres, internal honing lines, and dedicated assembly bays for hydraulic cylinder production \u2014 all under a documented quality management system. Standard lead times for stock specifications such as the HCYY11112026 rear outrigger rack cylinder are 7\u201310 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.<\/p>\n

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.<\/p>\n

Get a Quote \u2192 sales@boom-cylinders.com<\/a><\/p>\n<\/div>\n<\/div>\n

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Usein kysytyt kysymykset<\/h2>\n
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\nWhere can I buy a rear outrigger rack cylinder for a truck crane in the United Kingdom, and what is the typical price range for a quality replacement unit?\u2304<\/span><\/summary>\n
Rear outrigger rack cylinders for UK truck cranes are available directly from specialist hydraulic cylinder suppliers like Boom Cylinders (boom-cylinders.com). Pricing varies by specification and quantity \u2014 the HCYY11112026 (\u03a640\u00d7\u03a625\u00d7635) is competitively priced for replacement and fleet-refresh projects. For an accurate quote, email sales@boom-cylinders.com with your crane model and cylinder dimensions. OEM-equivalent units typically cost significantly less through a direct manufacturer than through a dealer network, and lead times are generally 7\u201310 working days to UK addresses.<\/div>\n<\/details>\n<\/div>\n
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\nHow do I know which hydraulic cylinder model number replaces my crane’s rear outrigger rack cylinder when the original has no visible part label?\u2304<\/span><\/summary>\n
Measure the bore diameter (the barrel’s internal diameter), the rod diameter, and the full stroke length with the cylinder fully extended. The installation distance \u2014 pin-to-pin when retracted \u2014 is equally important. For the HCYY11112026, those values are \u03a640 mm bore, \u03a625 mm rod, 635 mm stroke, and 840 mm retracted pin-to-pin. Bring those dimensions to our technical team and we can confirm compatibility before you order. Photos of the end connection type (clevis, flange, or pin eye) also help narrow down the correct unit quickly.<\/div>\n<\/details>\n<\/div>\n
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\nWhat causes a truck crane’s rear outrigger rack cylinder to leak, and how can fleet operators in England reduce this type of hydraulic failure?\u2304<\/span><\/summary>\n
Rod seal leakage is the most common outrigger cylinder failure on UK crane fleets. The primary causes are rod surface corrosion from road-salt exposure (attacking the chrome plating and creating a rough surface that cuts seal lips), seal hardening from prolonged outdoor storage in cold conditions, and mechanical rod damage from debris impact during transit. Specifying cylinders with hard-chrome-plated rods of adequate thickness (20\u201330 \u03bcm), composite polyurethane seals rather than older nitrile rubber seals, and fitting rubber rod-wiper covers during storage significantly extends service life on English and Scottish roads.<\/div>\n<\/details>\n<\/div>\n
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\nWhich hydraulic cylinder supplier in the UK can provide custom rear outrigger cylinders with non-standard stroke lengths or end connection types for older crane models?\u2304<\/span><\/summary>\n
Boom Cylinders (boom-cylinders.com) offers full custom engineering for non-standard outrigger cylinder specifications. Whether your crane uses an unusual stroke length, a non-metric bore, or a special end connection inherited from an older European or Asian platform, our engineering team reviews customer drawings and issues a custom quotation. Custom units typically carry a 3\u20135 week lead time depending on complexity and material availability. Contact sales@boom-cylinders.com with your drawings or detailed dimensions to begin the process.<\/div>\n<\/details>\n<\/div>\n
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\nHow long does shipping take when ordering a replacement rear outrigger rack cylinder from an international hydraulic supplier to a depot in Scotland or Wales?\u2304<\/span><\/summary>\n
Standard shipping to UK mainland addresses \u2014 including Scotland and Wales \u2014 typically takes 5\u20138 business days via freight forwarding once production is complete. Express options can reduce transit time further for urgent requirements. We recommend ordering replacement units before a crane goes out of service if at all possible; lead time transparency is something we take seriously and will confirm at the time of your quote so there are no surprises. Contact sales@boom-cylinders.com to discuss delivery options for your specific depot location.<\/div>\n<\/details>\n<\/div>\n
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\nWhat is the maximum working pressure and safety test pressure that the HCYY11112026 rear outrigger rack cylinder is rated to withstand?\u2304<\/span><\/summary>\n
The HCYY11112026 is rated for continuous service at 12 MPa working pressure and proof-tested to 18 MPa \u2014 a 50% safety factor above the rated working pressure. This margin is deliberately generous to handle hydraulic pressure spikes that occur during rapid valve switching, load shock, or pump-surge events on active construction sites. Each cylinder is pressure-tested at the factory before shipping; units that show any leakage or dimensional change during testing are rejected and do not ship to customers.<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

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Where can I buy a rear outrigger rack cylinder for a truck crane in the United Kingdom, and what is the typical price range for a quality replacement unit?<\/p>\n

Rear outrigger rack cylinders for UK truck cranes are available from specialist suppliers like Boom Cylinders. Email sales@boom-cylinders.com for a quote on the HCYY11112026 (Phi40xPhi25x635). OEM-equivalent units ship in 7-10 working days to UK addresses.<\/div>\n<\/div>\n
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What is the maximum working pressure and safety test pressure that the HCYY11112026 rear outrigger rack cylinder is rated to withstand?<\/p>\n

The HCYY11112026 operates at 12 MPa working pressure and is proof-tested to 18 MPa \u2014 a 50% safety margin above rated pressure.<\/div>\n<\/div>\n<\/div>\n

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Ready to Source Your Rear Outrigger Rack Cylinder?<\/h3>\n

Send your specifications to our engineering team and receive a detailed quote within one working day.<\/p>\n

Pyyd\u00e4 tarjous \u2014 sales@boom-cylinders.com<\/a><\/p>\n

boom-cylinders.com \u00a0|\u00a0 Specialist Truck Crane Hydraulic Cylinders \u00a0|\u00a0 Serving the United Kingdom | edit by gzl<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Rear outrigger rack cylinder HCYY11112026 \u2014 40mm bore, 635mm stroke, 12MPa rated. Replacement behind cylinder for opening rack support on truck cranes. Fast UK delivery. Request a quote: sales@boom-cylinders.com<\/a><\/p>","protected":false},"featured_media":1609,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1081],"product_tag":[],"class_list":["post-1606","product","type-product","status-publish","has-post-thumbnail","product_cat-cylinder-series-for-truck-cranes","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/product\/1606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/comments?post=1606"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/media\/1609"}],"wp:attachment":[{"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/media?parent=1606"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/product_brand?post=1606"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/product_cat?post=1606"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/boom-cylinders.com\/fi\/wp-json\/wp\/v2\/product_tag?post=1606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}