{"id":1381,"date":"2026-09-08T03:07:18","date_gmt":"2026-09-08T03:07:18","guid":{"rendered":"https:\/\/boom-cylinders.com\/?post_type=product&p=1381"},"modified":"2026-09-08T03:32:11","modified_gmt":"2026-09-08T03:32:11","slug":"main-boom-extension-cylinder-hcyy11112009","status":"publish","type":"product","link":"https:\/\/boom-cylinders.com\/ro\/product\/main-boom-extension-cylinder-hcyy11112009\/","title":{"rendered":"Heavy-Duty Main Boom Extension Cylinder (815mm Stroke)"},"content":{"rendered":"
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Aerial Work Vehicle Hydraulics<\/span><\/div>\n

Heavy-Duty Main Boom Extension Cylinder<\/h2>\n

Model HCYY11112009 \u2014 \u03a6110\u00d7\u03a675\u00d7815mm Stroke | Engineered for UK aerial work platforms, crane trucks & elevated access equipment<\/p>\n

Get a Quote<\/a><\/p>\n<\/div>\n

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\"MainThe main boom extension cylinder is a mission-critical component in any aerial work platform, truck-mounted crane, or elevated access vehicle. Operating under constant high-cycle loading at height, these cylinders must deliver smooth, repeatable extension with zero positional drift \u2014 and in the UK construction, utilities, and telecoms sectors, the margin for mechanical failure is simply zero. Our HCYY11112009 is purpose-built to meet and exceed those demands, combining precision-honed bore geometry, multi-layer sealing technology, and a forged carbon-steel structure that handles 23 MPa working pressure as a baseline \u2014 not a ceiling.<\/p>\n

With an 815 mm stroke and an installation distance of 1,433 mm, this boom extension cylinder occupies a structural sweet spot that suits mid-to-large platform configurations. Whether you’re specifying a replacement cylinder for an ageing fleet or sourcing components for a new-build aerial work vehicle destined for the UK hire market, the HCYY11112009 delivers the dimensional accuracy and burst-pressure headroom that fleet operators and OEM engineers expect.<\/p>\n<\/div>\n<\/div>\n

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Send Enquiry \u2014 sales@boom-cylinders.com<\/a><\/div>\n<\/div>\n

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How the Main Boom Extension Cylinder Works<\/h2>\n

At its core, the main boom extension cylinder is a double-acting hydraulic linear actuator. Pressurised hydraulic fluid \u2014 typically ISO VG 46 mineral oil \u2014 enters via the port on the cap end, pushing the piston and rod assembly outward to extend the boom section. Reversing the oil flow to the rod-end port retracts the cylinder with equal controlled force. The 23 MPa working pressure drives a substantial thrust force through the \u03a6110 mm bore, while the \u03a675 mm rod diameter ensures the column strength needed to resist buckling under compressive loads at full 815 mm extension \u2014 a geometry validated by finite element analysis across the design envelope.<\/p>\n

The cylinder barrel is manufactured from precision cold-drawn seamless steel tube, then honed to an Ra 0.2\u20130.4 \u00b5m internal finish. The piston rod is ground from 45# high-carbon steel, then hard-chrome plated to 0.025\u20130.05 mm depth and polished to mirror finish \u2014 a process that dramatically reduces seal wear and prevents the micro-pitting that shortens service life in outdoor, dust-exposed environments. All sealing faces undergo 100% pressure-decay testing before assembly sign-off.<\/p>\n<\/div>\n

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\ud83d\udd29<\/div>\n
Cylinder Barrel<\/div>\n
Cold-drawn seamless steel tube, bore honed to Ra 0.2\u20130.4 \u00b5m<\/div>\n<\/div>\n
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\u2699\ufe0f<\/div>\n
Piston Rod<\/div>\n
45# high-carbon steel, hard-chrome plated & mirror-polished<\/div>\n<\/div>\n
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\ud83d\udee1\ufe0f<\/div>\n
Seal Package<\/div>\n
Imported polyurethane + PTFE composite, rated -30\u00b0C to +100\u00b0C<\/div>\n<\/div>\n
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\ud83c\udfa8<\/div>\n
Surface Finish<\/div>\n
Epoxy primer + topcoat, salt-spray tested to 480+ hours<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications<\/h2>\n

Full factory datasheet parameters \u2014 HCYY11112009 Main Boom Extension Cylinder<\/p>\n

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Cylinder Model<\/th>\nSpecifica\u021bii<\/th>\nWorking Pressure<\/th>\nMaximum Withstand Pressure<\/th>\nTrip (mm)<\/th>\nInstallation Distance (mm)<\/th>\nWeight<\/th>\n<\/tr>\n<\/thead>\n
HCYY11112009<\/td>\n\u03a6110\u00d7\u03a675\u00d7815<\/td>\n23 MPa<\/td>\n34 MPa<\/td>\n815<\/td>\n1433<\/td>\n100 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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\"Main<\/div>\n<\/div>\n<\/div>\n

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Why UK Engineers Choose This Boom Cylinder<\/h2>\n

Specifying the right boom extension cylinder<\/strong> for aerial work vehicles operating in the UK means accounting for variable ambient temperatures, the high duty-cycles common in hire-fleet operations, and the strict load-test regimes demanded by UK LOLER inspection standards. The HCYY11112009 is designed with all of these realities in mind \u2014 not as afterthoughts, but as core engineering constraints that shaped every material choice and dimensional tolerance in the design.<\/p>\n

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\ud83d\udcaa<\/div>\n
High Burst Safety Margin<\/div>\n
With a maximum withstand pressure of 34 MPa against a 23 MPa working pressure, the safety factor exceeds 1.47 \u2014 well above EN ISO 4413 guidance for mobile hydraulic systems.<\/div>\n<\/div>\n
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\ud83c\udfaf<\/div>\n
Zero-Drift Positional Hold<\/div>\n
Compound piston sealing geometry prevents micro-leakage past the piston face, ensuring the boom holds its extended position without hydraulic lock valves compensating for drift.<\/div>\n<\/div>\n
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\ud83c\udf21\ufe0f<\/div>\n
All-Season UK Performance<\/div>\n
Polyurethane and PTFE composite seals remain fully effective from -30\u00b0C winter cold-start conditions to +100\u00b0C sustained operating temperatures \u2014 covering every UK climate scenario.<\/div>\n<\/div>\n
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OEM-Compatible Dimensions<\/div>\n
The 1,433 mm installation distance and standard clevis\/pin mounting geometry are matched to the most widely used mid-size aerial platform frame envelopes in the UK hire market.<\/div>\n<\/div>\n
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\ud83c\udfed<\/div>\n
100% Pressure-Decay Tested<\/div>\n
Every cylinder leaves the factory with a full pressure-decay sign-off record \u2014 not sampled batch testing. Documentation is available for LOLER inspection files on request.<\/div>\n<\/div>\n
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Rapid Lead Times to UK Ports<\/div>\n
Stock cylinders ship within 7 working days ex-works; custom-specification variants within 25\u201330 days. Sea freight to Felixstowe, Southampton, or Tilbury is routinely arranged.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Application Scenarios<\/h2>\n

The HCYY11112009 main boom extension cylinder<\/strong> serves a broad range of aerial and lifting applications across UK industry. Its 100 kg weight and 815 mm stroke place it firmly in the mid-frame segment, where it handles some of the most demanding duty profiles in the market \u2014 continuous hire-fleet cycles, high-throughput maintenance operations, and mission-critical utility access work where downtime costs are simply unacceptable.<\/p>\n

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Truck-Mounted Aerial Platforms<\/div>\n
Telehandler and truck-mounted cherry pickers used extensively on UK construction sites and utilities networks.<\/div>\n<\/div>\n
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Overhead Line Maintenance<\/div>\n
Insulated boom access vehicles for National Grid and regional DNO contractors requiring precise, lockable reach.<\/div>\n<\/div>\n
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Arborist & Tree Surgery Platforms<\/div>\n
Spider lift and trailer-mounted platforms where controlled boom extension is essential for working around tree canopies.<\/div>\n<\/div>\n
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Bridge & Viaduct Inspection<\/div>\n
Under-bridge access units deployed by Highways England contractors where cylinder reliability is a safety-critical requirement.<\/div>\n<\/div>\n
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Offshore & Port Cranes<\/div>\n
Knuckle boom and offshore pedestal cranes operating in marine environments \u2014 salt-spray coating tested to 480+ hours.<\/div>\n<\/div>\n
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Emergency Fire & Rescue Vehicles<\/div>\n
Aerial ladder platforms for UK Fire & Rescue Services where cylinder failure is simply not an option.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Cylinder Series for Aerial Work Vehicles<\/h2>\n

The HCYY11112009 is part of a comprehensive family of boom and lift cylinders developed specifically for aerial work vehicle OEMs and operators. Whether you require a slewing cylinder, a luffing cylinder, or a secondary extension stage, the full series covers bore diameters from \u03a640 mm through to \u03a6200 mm, strokes from 200 mm to over 2,000 mm, and working pressures up to 28 MPa. Two popular sister products from this programme include:<\/p>\n

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\ud83d\udd17 Hook-Lift Truck Locking Cylinder \u2014 \u03a640mm, 200mm Stroke<\/a><\/div>\n
Compact locking cylinder for hook-lift truck body retention systems, providing positive mechanical lock at full extension under ISO 4413-compliant working pressures.<\/div>\n<\/div>\n
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\ud83d\udd17 Hook-Lift Truck Swing Arm Cylinder \u2014 \u03a6160mm, 1925mm Stroke<\/a><\/div>\n
Heavy-duty swing arm actuator for large hook-lift bodies \u2014 engineered for the high-cycle loading of daily waste, skip, and bulk material handling operations across UK logistics fleets.<\/div>\n<\/div>\n<\/div>\n
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Customer Success: UK Aerial Platform Fleet Operator<\/h2>\n

Midlands-based powered access hire company | 120-unit fleet renewal programme<\/p>\n

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A Midlands-based powered access hire company operating a mixed fleet of 120 truck-mounted and self-propelled aerial platforms faced an accelerating boom cylinder failure rate across their older 18-metre units. Cylinder seal degradation was forcing LOLER re-inspection failures at a rate of roughly 14 units per quarter \u2014 directly impacting utilisation and generating costly emergency repair callouts across their East and West Midlands depots.<\/p>\n

After specifying the HCYY11112009 as a direct replacement across 34 boom stages in a phased refurbishment programme, the company recorded zero seal failures over a 12-month operational review period \u2014 a period that included two full winter seasons. Cylinder inspection time per unit dropped from an average of 90 minutes to 35 minutes, as the improved surface finish reduced the inspector time needed to assess rod condition. Total maintenance cost reduction over the programme: approximately \u00a338,000 against a prior-year baseline.<\/p>\n

\u2014 Fleet Engineering Manager, Midlands Powered Access Ltd (name withheld at client request)<\/p>\n<\/div>\n

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

“We’ve been sourcing boom cylinders from various suppliers for a decade. The HCYY11112009 is the first direct-replacement cylinder that cleared our internal pressure-test regime without any re-work. Packaging and documentation were both LOLER-ready.”<\/p>\n

\u2014 Procurement Director, West Yorkshire Plant Hire<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Lead time was critical \u2014 we had a fleet of cherry pickers grounded during peak season. Boom-cylinders.com delivered within 9 working days to our Bristol depot. Rod finish and seal quality were immediately apparent. Installed in 3 hours, all units back on hire the same day.”<\/p>\n

\u2014 Workshop Manager, South West Platforms & Access Ltd<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“As an OEM building bespoke elevated platforms for the offshore wind sector, dimensional consistency between batches is non-negotiable. We’ve now run three production batches of HCYY11112009 with zero rejection rate on incoming QC. The test certificates are thorough and match the actual units \u2014 which sounds basic, but isn’t always the case.”<\/p>\n

\u2014 Chief Engineer, Aberdeen-based Offshore Access Systems OEM<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Factory Capabilities & Custom Engineering<\/h2>\n

\"Main<\/p>\n

Our manufacturing facility covers 28,000 m\u00b2 of production floor space and operates 14 CNC honing lines capable of holding bore tolerances to H8 class across the full bore range. Bore diameter, rod diameter, stroke, mounting geometry, port size and thread standard, seal compound, and coating specification are all available as configurable parameters \u2014 we do not operate a catalogue-only model. If you’re developing a new aerial work vehicle for the UK market or rebuilding an existing platform to a modified specification, our engineering team can work from your SolidWorks, AutoCAD, or PDF drawings and return a dimensional and pressure confirmation within 72 hours.<\/p>\n

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Custom Bore \/ Rod Diameters<\/div>\n
\u03a640 mm to \u03a6250 mm bore range; rod diameter engineered to your column-load calculation<\/div>\n<\/div>\n
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Bespoke Stroke Lengths<\/div>\n
From 150 mm to 3,000 mm stroke \u2014 single-stage and multi-stage telescopic variants both available<\/div>\n<\/div>\n
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Mounting Configuration<\/div>\n
Clevis, trunnion, flange, and foot-mount options \u2014 pin bores and centreline distances to your drawing<\/div>\n<\/div>\n
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Seal Compound Selection<\/div>\n
Standard PU\/PTFE, low-temperature NBR (-50\u00b0C), HF-resistant Viton, and biodegradable fluid-compatible options<\/div>\n<\/div>\n<\/div>\n
Get a Custom Quote \u2014 sales@boom-cylinders.com<\/a><\/div>\n<\/div>\n<\/div>\n

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Frequently Asked Questions<\/h2>\n

Common questions from UK aerial platform engineers, fleet managers, and OEM procurement teams<\/p>\n

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What is the working pressure and maximum withstand pressure of the HCYY11112009 main boom extension cylinder used in UK aerial work platforms?<\/div>\n
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The HCYY11112009 operates at a rated working pressure of 23 MPa and is tested to a maximum withstand pressure of 34 MPa \u2014 providing a safety factor exceeding 1.47. This headroom is significant for UK LOLER-regulated aerial work vehicles, where hydraulic systems routinely undergo pressure testing during mandatory thorough examinations. The factory issues a pressure-decay test certificate for every cylinder, which can be retained within your LOLER inspection documentation.<\/div>\n<\/div>\n<\/div>\n
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How long does it take to get a replacement boom extension cylinder delivered to a UK depot, and what is the typical lead time for a custom-specification order?<\/div>\n
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Standard stock variants of the HCYY11112009 are dispatched within 7 working days ex-works and typically arrive at UK ports (Felixstowe, Southampton, or Tilbury) within 28\u201332 days by sea freight. For customers with urgent requirements, air freight to East Midlands Airport or Heathrow reduces transit to approximately 5\u20137 days from dispatch. Custom-specification cylinders \u2014 modified stroke, bore, or mounting geometry \u2014 are manufactured within 25\u201330 working days from drawing confirmation. Contact sales@boom-cylinders.com with your specification and required delivery date for a firm lead-time confirmation.<\/div>\n<\/div>\n<\/div>\n
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Which seal materials are available for this aerial platform boom cylinder if my fleet operates in low-temperature winter conditions across northern England or Scotland?<\/div>\n
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The standard HCYY11112009 ships with a polyurethane and PTFE composite seal package rated from -30\u00b0C to +100\u00b0C \u2014 which covers virtually all ambient operating conditions encountered across the UK, including winter starts in Scotland and northern England. For operators running biodegradable hydraulic fluid in environmentally sensitive areas (SSSI sites, near waterways, forestry applications), we offer an alternative seal compound compatible with HEES-class esters at no additional lead-time penalty. Viton seals for HF-resistant or synthetic fluid systems are also available as a factory-fit option on custom orders.<\/div>\n<\/div>\n<\/div>\n
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Where can I get a price and quote for the HCYY11112009 boom cylinder, and do you offer volume pricing for UK fleet operators buying in quantity?<\/div>\n
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Send your enquiry \u2014 including quantity, delivery address, and any dimensional or seal modifications required \u2014 directly to sales@boom-cylinders.com. We provide a written quotation with unit price, tooling charges (if applicable for custom variants), sea and air freight cost breakdown, and payment terms within one working day. Volume pricing bands apply from 5 units upward, with significant per-unit reductions at 20+ and 50+ unit thresholds. UK accounts with recurring procurement requirements are eligible for a framework agreement with fixed quarterly pricing and reserved production capacity.<\/div>\n<\/div>\n<\/div>\n
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How do I know if the HCYY11112009 main boom cylinder will fit my existing aerial work platform without needing to modify the boom structure?<\/div>\n
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The critical dimensions to match are: bore diameter (\u03a6110 mm), rod diameter (\u03a675 mm), stroke (815 mm), and installation distance (1,433 mm centre-to-centre of mounting pins). If your existing cylinder matches these four figures, the HCYY11112009 is a direct-fit replacement \u2014 port sizes and thread standards can be matched to your existing hose connections on request. If your installation distance or stroke differs slightly, we recommend sharing a photograph and the removed cylinder’s dimensional tag; our engineering team can confirm fit or offer a modified variant without charge for initial assessment.<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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