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HCYY11112020 — Crawler Crane Frame Support Hydraulic Cylinder
The crawler crane frame support hydraulic cylinder HCYY11112020 is a vertical stabilisation jack that transfers the crane’s operational load to the ground directly through the crane’s main frame. With an 88% rod-to-bore ratio (150 mm rod within a 170 mm bore), this cylinder carries predominantly compressive loads and is designed to resist column buckling under the full weight of the crane and its suspended load. A square flange top-body mount combined with a rod-end fork clevis allows accurate load transfer at both ends. Working pressure is 30 MPa with a 40 MPa maximum withstand rating.
Product Overview
A crawler crane’s own weight — plus the weight of its boom, counterweights, and any suspended load — must be transferred to the ground through the track undercarriage during travel and through dedicated support points during lifting operations. Frame support cylinders are used either as vertical stabilisation jacks beneath the crane’s main frame or as outrigger jacks where the crane is deployed on prepared pads. Their role is to spread the ground reaction force over a larger bearing area, level the crane on unprepared or sloped ground, and eliminate the risk of ground subsidence beneath the crawler tracks during heavy lifts that can cause the crane to tilt.
HCYY11112020 operates in compression: the cylinder extends downward to bear against a ground pad or foundation, and the reactive load is transmitted upward through the cylinder body and flange mount into the crane’s frame. At 30 MPa working pressure and 170 mm bore, the extension force is 680.7 kN. The retraction force — which acts through the 150 mm rod annular area — is 151.5 kN, sufficient to lift the cylinder body clear of the ground when the crane relocates. The Euler buckling safety factor of 4.8× at the rated load, calculated for the 800 mm stroke and 150 mm rod combination, confirms that the column load capacity significantly exceeds the cylinder’s hydraulic output at working pressure, meaning hydraulic capacity is the governing design parameter, not buckling.
The square flange body mount is a four-bolt pattern that distributes the compressive reaction into the crane’s frame steelwork without creating concentrated point loads on the frame plate. The rod-end fork clevis allows the cylinder to be pinned to the ground pad or footing shoe, which prevents the pad from slipping laterally under the crane’s horizontal inertia loads during slewing. The 1,140 mm installation distance from the flange datum to the fork pin centreline is the key dimension for confirming that the cylinder fits the vertical clearance of the frame pocket it occupies without requiring frame modification.
Technical Specifications
| Specification | Value |
|---|---|
| Cylinder Model | HCYY11112020 |
| Specification | Φ170×Φ150×800 mm (Bore × Rod × Stroke) |
| Bore Diameter | 170 mm |
| Rod Diameter | 150 mm (88% rod-to-bore ratio) |
| Stroke | 800 mm |
| Working Pressure | 30 MPa |
| Maximum Withstand Pressure | 40 MPa |
| Installation Distance | 1,140 mm |
| Weight | 262 kg |
| Extension Force (at 30 MPa) | 680.7 kN |
| Retraction Force | 151.5 kN |
| Euler Buckling Safety Factor | 4.8× at rated load |
| Body Mount | Square flange, top body |
| Rod End Mount | Fork clevis |
| Rod Material | 42CrMo4 alloy steel + Charpy toughness certification |
| Compliance | EN 13135 structural component classification |
Engineering Features
Bore Diameter — Ground Load Capability
The 170 mm bore at 30 MPa working pressure produces a 680.7 kN extension force, which represents the maximum compressive load the cylinder transfers to the ground pad. This force sets the capacity of the crane’s outrigger system: the crane’s maximum working load at any radius is constrained by the lower of the crane structure’s strength, the boom’s rated load chart, and the outrigger cylinder’s ground reaction capacity. Specifying a higher bore diameter increases ground reaction capacity without requiring higher hydraulic pressure, which is advantageous when the crane is operating on soft ground where pad bearing capacity is already the limiting factor.
Rod Diameter — Column Buckling Resistance
The 150 mm rod carries the compressive load over an 800 mm extended length. The Euler buckling safety factor of 4.8× means the theoretical critical buckling load is 4.8 times the rated hydraulic extension force at 30 MPa. This safety margin accommodates lateral loads from crane slewing momentum and ground slope that create eccentric loading on the column. The 88% rod-to-bore ratio is the highest in the crawler crane series and reflects the compressive nature of this application: almost the entire bore cross-section is solid rod, leaving a thin annular area for retraction hydraulic force, which is consistent with the asymmetric force requirement — high extension capacity, moderate retraction.
Stroke Length — Levelling Range
The 800 mm stroke defines the range over which the crane frame can be raised or lowered vertically relative to the ground pad. This range accommodates uneven ground surfaces and allows the crane’s upper structure to be levelled to within the permissible tilt angle specified in the crane’s load chart. Exceeding this stroke in a replacement cylinder would require the crane frame pocket to have additional clearance; a shorter stroke reduces levelling capability on rough ground.
Installation Distance — Frame Pocket Compatibility
The 1,140 mm installation distance is measured from the flange mounting face to the pin centreline at the rod-end fork clevis in the retracted position. This dimension determines whether the cylinder fits within the crane frame’s vertical pocket dimension in the stowed (retracted) configuration. A cylinder that is too long will not retract fully into the frame pocket and may contact the crane structure or prevent travel. The installation distance must match the original exactly for the cylinder to fit without structural modification.
Working Pressure and Maximum Withstand Pressure
The 30 MPa working pressure is the continuous system pressure under which the cylinder operates during support deployment and load bearing. The 40 MPa maximum withstand pressure is the proof load — the highest transient pressure the cylinder can experience without permanent deformation. The 1.33× ratio between rated and maximum pressure provides capacity for pressure transients generated by sudden load application — for example, when a crane begins to lift a load and the weight transfers rapidly from the ground to the boom and back to the outrigger cylinders.
Square Flange Mount — Structural Load Distribution
The square flange at the top of the cylinder body distributes the compressive reaction force into the crane’s main frame through four bolt points arranged symmetrically around the cylinder axis. This spreading of load prevents concentrated stress in the frame plate at the cylinder mounting location, which is important for long-term fatigue performance of the frame during repeated deployment and retraction cycles across the crane’s service life. Customisation of flange bolt pattern and plate thickness is available to match specific crane frame designs.
42CrMo4 Rod with Charpy Toughness Certification
As with the other cylinders in the crawler crane series, the 42CrMo4 rod material is specified with Charpy impact test certification. For a support jack that may be deployed and loaded rapidly in cold weather, this certification confirms the rod material will absorb impact energy ductilely rather than fracturing, even under the eccentric loading that occurs when the ground pad is not perfectly level and the cylinder body experiences a small bending moment in addition to its primary axial compression.
Application Areas
- Crawler crane vertical stabilisation jack: the primary application — bearing the crane’s operational weight on prepared pads and levelling the crane frame on uneven ground before heavy lifts begin.
- Construction site heavy lifting operations: bridge construction, precast structure erection, and module setting where crawler cranes require outrigger deployment to supplement the track undercarriage reaction area.
- Infrastructure engineering in confined or soft-ground sites: where the crawler tracks alone cannot distribute crane load adequately and engineered ground pads with outrigger cylinders are required to prevent settlement.
- Long-duration heavy lifting projects: power plant construction, LNG tank building, and refinery projects where the crane is stationary in one position for extended periods and frame support cylinders carry sustained load throughout the work shift.
- OEM crawler crane manufacturing: new-build cranes requiring a structurally classified, drawing-matched frame support cylinder to meet the EN 13135 crane structural component requirements.
OEM Replacement and Custom Manufacturing
Frame support cylinders on crawler cranes accumulate cycles across many years of service and may require replacement due to seal wear, chrome rod damage, or structural fatigue at mounting points. We manufacture replacement cylinders to the exact bore, rod, stroke, and mounting dimensions of the original, using 42CrMo4 rod with Charpy certification as standard for this structural classification. Flange bolt pattern, bolt circle diameter, and fork clevis pin dimensions must be confirmed at the time of ordering to ensure interchangeability without frame modification.
Custom frame support cylinders are available for crane designs with different frame pocket dimensions, load requirements, or mounting configurations. We can adjust bore diameter, rod diameter, stroke, working pressure, flange pattern, and rod-end mount style to match a customer-supplied drawing. For applications requiring a different column buckling safety factor, we can recalculate the required rod diameter for the specified stroke and load and confirm the result before production.
Volume pricing is available for crane OEMs and equipment distributors maintaining replacement part inventories for crane fleets. Contact us with your crane model, cylinder dimensions, and required annual quantity for a supply agreement quotation.
Pertanyaan yang Sering Diajukan
What does a crawler crane frame support cylinder do, and why is it necessary?
The frame support cylinder acts as a vertical stabilisation jack that transfers the crane’s load to the ground through a prepared bearing pad. It distributes the crane’s weight more evenly than the track undercarriage alone can, prevents ground settlement under the tracks during sustained heavy lifts, and allows the crane frame to be levelled on ground that is not perfectly flat. Without adequate support, an unlevel crane is at risk of tipping under asymmetric load at long radius.
Why does this cylinder have such a high rod-to-bore ratio?
The 88% rod-to-bore ratio (150 mm rod within 170 mm bore) is needed for two reasons: to provide column buckling resistance for the 800 mm stroke under 680.7 kN compressive load, and to create a high Euler buckling safety factor (4.8×) that accommodates eccentric loading from crane slewing inertia and unlevel ground. The thick rod means retraction force through the annular area is relatively low (151.5 kN), which is acceptable since retraction only needs to lift the cylinder body — not carry any external load.
Can you supply a replacement frame support cylinder matching my crane’s existing installation distance?
Yes. Provide the installation distance, bore diameter, rod diameter, stroke, flange bolt pattern, and fork clevis pin diameter. If your crane’s support cylinder has an installation distance different from the 1,140 mm of HCYY11112020, we manufacture to your specified dimension. We recommend verifying the installed cylinder’s dimensions before ordering rather than relying on nominal drawings, as machined dimensions may differ from original drawings after field modifications.
What is the maximum hydraulic pressure this cylinder can withstand?
The rated working pressure is 30 MPa. The maximum withstand pressure is 40 MPa. The 1.33× pressure margin between rated and maximum covers pressure transients during rapid load application. All cylinder components — barrel, end caps, ports, rod gland, and seals — are rated to the 40 MPa proof load.
What does the Euler buckling safety factor mean in practice?
The Euler buckling safety factor of 4.8× means the rod’s theoretical critical buckling load is 4.8 times the actual hydraulic extension force at working pressure. This factor accounts for the real-world conditions under which the cylinder operates — eccentricity from slightly unlevel pads, lateral loads from crane slewing, and any imperfections in rod straightness — without entering a range where column instability could develop. A factor below 3× would require engineering review for this application.
Can the flange bolt pattern or fork clevis dimensions be customised?
Yes. Both the square flange bolt pattern and the fork clevis pin diameter are customisable to match the existing bolt holes and pin sizes on your crane’s frame and ground pad. These dimensions are required at the time of quotation and are confirmed on a dimensional drawing before production begins.
How does this cylinder improve crane stability during operation?
By extending the crane’s ground contact points beyond the track width and applying controlled vertical pressure to engineered bearing pads, the frame support cylinders reduce the effective slewing radius of the crane’s overturning moment. This means that for a given suspended load at a given radius, the overturning moment is resisted by a greater restoring moment from the wider supported base, improving the stability margin. The cylinder also allows the crane operator to compensate for ground settlement during a lift by extending the cylinder incrementally to maintain levelness.
Do you supply material documentation for EN 13135 structural component applications?
Material test records including chemical composition, mechanical properties, and Charpy impact test results are available for the 42CrMo4 rod on request. Dimensional inspection reports covering bore diameter, rod diameter, stroke, installation distance, and port positions can also be supplied. Specify your documentation requirements when requesting a quotation so that they are included in the order confirmation and delivery package.
Request a Quotation for HCYY11112020
Send us your frame support cylinder dimensions, flange bolt pattern, and installation distance for a quotation on crawler crane support jacks. Bulk pricing is available for fleet maintenance programs and OEM supply.
