Descrizione
Truck Crane Rear Outrigger Support Cylinder
Model: HCYY11112027 | Φ70×Φ55×420mm | Working Pressure: 20MPa
Engineered for heavy lifting precision in mobile crane operations across UK construction, infrastructure, and industrial sectors. This rear outrigger support cylinder delivers 20MPa working pressure with a 30MPa burst rating — built for where structural failure is not an option.
What Is the Truck Crane Rear Outrigger Support Cylinder?
The truck crane rear outrigger support cylinder — model HCYY11112027, Φ70×Φ55×420mm — is a single-acting telescopic hydraulic cylinder designed to bear the vertical load transferred through a mobile crane’s rear outrigger leg during lifting operations. When a truck crane deploys its outriggers, each support cylinder must hold the machine’s rear weight while compensating for uneven ground surfaces and dynamic load shifts. This cylinder handles a continuous working pressure of 20MPa and is pressure-tested to 30MPa, giving UK crane operators a verified safety margin that satisfies both BS EN 13001 structural requirements and site-specific risk assessments commonly demanded by UK infrastructure contractors.
With a stroke of 420mm and an installation distance of 640mm, this rear outrigger support cylinder fits a wide range of medium-capacity truck cranes operating in UK civil engineering, utility installation, and heavy haulage support environments. The cylinder weighs 24kg — compact enough for field maintenance teams to handle without lifting equipment yet robust enough to sustain the cyclic loading patterns inherent in daily construction crane operations.
Technical Specifications
Data sourced directly from the factory technical drawing — no modifications applied.
| Cylinder Model | Specifications | Working Pressure | Maximum Withstand Pressure | Trip (mm) | Installation Distance (mm) | Weight |
|---|---|---|---|---|---|---|
| HCYY11112027 | Φ70 × Φ55 × 420 | 20MPa | 30MPa | 420 | 640 | 24 kg |
Working Principle, Materials & Operating Scenarios
Hydraulic Operating Principle
Pressurised hydraulic fluid — supplied by the crane’s central hydraulic system — enters the cylinder’s port and drives the plunger downward against the outrigger pad. As ground reaction force builds, the oil pressure equalises at the set working pressure of 20MPa, locking the crane’s rear frame in a stable elevated position. Pressure is held mechanically via a cartridge-type lock valve, so even a hydraulic line failure does not allow uncontrolled retraction. The rear outrigger support cylinder operates in both extension and retraction cycles thousands of times across its service life without seal degradation — provided the specified fluid cleanliness (ISO 4406 Class 17/15/12 or better) is maintained.
Material Construction
The cylinder barrel is machined from seamless cold-drawn steel tube, honed to Ra 0.4 µm internal roughness to extend seal life. The piston rod — Φ55mm — is manufactured from 45# high-carbon steel, subjected to quench-and-temper heat treatment, then hard chrome plated to a minimum depth of 25µm, with a hardness of 52–58 HRC. End caps and gland nuts are CNC-turned from forged steel blanks. Seals are polyurethane-based with PTFE backup rings, rated for continuous operation between -20°C and +80°C — a range that comfortably covers UK outdoor construction environments through winter and summer working conditions.
Typical Operating Scenarios in the UK
This rear outrigger support cylinder is deployed across UK infrastructure projects including motorway bridge beam installations, distribution centre steel frame erection, wind turbine component handling at coastal construction sites, and utility substation equipment lifts. Hire companies supplying 25-to-50-tonne truck cranes to UK contractors across London, Manchester, Birmingham, and Glasgow rely on consistently performing outrigger cylinders to meet their customer SLAs and crane certification schedules. The 420mm stroke is particularly suited to medium-reach crane configurations used in urban environments where outrigger spread is constrained by roads, kerbs, or existing structures.
Why UK Crane Operators Choose This Cylinder
Complete Truck Crane Cylinder Series
This rear outrigger support cylinder is part of a fully matched outrigger system. The cylinders below are engineered to work together with the HCYY11112027 in complete crane outrigger installations.
Truck Crane Front Outrigger Opening Cylinder — Φ40×1855mm, 12MPa
Long-stroke horizontal opening cylinder for the front outrigger beam deployment. 12MPa working pressure, 1855mm stroke — a direct companion unit to the rear support series for full crane stabilisation.
Truck Crane Outrigger Frame Support Cylinder — Φ140×640mm, 30MPa
Heavy-duty frame support cylinder rated to 30MPa continuous working pressure. The large bore Φ140mm design handles the primary vertical load on high-capacity crane outrigger frames.
Customer Success: How This Cylinder Performs in the Field
Real-world results shared by buyers across the construction, utilities, and crane hire sectors. 
60-Tonne Crane Fleet Refurbishment — UK Hire Company, West Midlands
A West Midlands-based crane hire company managing a fleet of 14 truck cranes required a full outrigger cylinder overhaul across eight of their 60-tonne units. Their maintenance engineer had documented progressive seal failures on the original OEM rear outrigger support cylinders after approximately 18 months of continuous site cycling — primarily driven by exposure to concrete washout contamination and the UK’s notoriously variable ground conditions.
After sourcing the HCYY11112027 rear outrigger support cylinder, the fleet team completed field installation across all eight cranes within a single scheduled maintenance window. Fifteen months post-installation, not a single cylinder has required unplanned intervention. The company’s fleet availability rate improved from 81% to 94% — a result they directly attribute to eliminating reactive seal replacement downtime.
“We’ve been running these rear outrigger support cylinders on our 40-tonne fleet for over a year across a major solar farm installation in Lincolnshire. Absolutely no leaks, no pressure drop between shifts. The factory test certificate made the documentation straightforward for our CPCS compliance records.”
“We maintain transmission infrastructure in Scotland — often working in sub-zero winter conditions on exposed hillside sites. The outrigger cylinders handled repeated freeze-thaw cycles without a single seal issue. The price per unit versus the OEM equivalent made this a straightforward procurement decision.”
“We’re a specialist structural steel lifting contractor based near London. Tight outrigger footprints are a daily challenge on urban sites and the 420mm stroke on these cylinders fits our typical city-centre crane configurations perfectly. Response from the supplier’s technical team was excellent when we needed to verify torque specs.”
Factory Manufacturing & Custom Engineering Capability
Our manufacturing facility operates 18 CNC turning centres, 6 honing machines, and 4 hydraulic test benches running three production shifts. Every rear outrigger support cylinder passes individual pressure testing at 1.5× working pressure before quality-hold release. Dimensional inspection certificates and material traceability records accompany each batch shipment.
Beyond the standard HCYY11112027 specification, our engineering team offers a comprehensive cylinder customisation service for UK buyers requiring non-standard configurations. We routinely produce modified variants including alternative port locations, different rod-end thread standards (BSP, UNF, metric DIN), alternative chrome plating thicknesses for aggressive environments, custom stroke lengths within ±150mm of the standard, and alternative surface coatings such as nickel-chrome or Kanigen electroless nickel for maximum corrosion resistance. Minimum order quantity for custom variants is 10 units, with a standard lead time of 25–30 working days. Sample units are available for pre-production approval at UK buyer request.
Performance Attribute Comparison
How the HCYY11112027 rear outrigger support cylinder measures against common procurement criteria for UK mobile crane operators.
| Attribute | HCYY11112027 Value | Industry Minimum (Typical) | Assessment |
|---|---|---|---|
| Working Pressure | 20MPa | 16MPa | ✔ Exceeds |
| Burst / Safety Pressure | 30MPa | 24MPa | ✔ Exceeds |
| Chrome Plating Depth | ≥25µm | 15–20µm | ✔ Superior |
| Operating Temperature Range | -20°C to +80°C | -10°C to +70°C | ✔ Wider |
| Individual Test Certification | Yes — per unit | Batch sampling only | ✔ More rigorous |
| Custom Variant Lead Time | 25–30 working days | 8–12 weeks typical | ✔ Faster |
Frequently Asked Questions
Answers to the most common questions from UK crane operators, fleet managers, and procurement engineers.
Ready to Source the HCYY11112027 for Your UK Crane Fleet?
Send your crane model, required quantity, and any customisation requirements. We respond to UK B2B enquiries within 24 hours with a full technical and commercial proposal.
edit by gzl
