{"id":1793,"date":"2026-09-09T06:12:46","date_gmt":"2026-09-09T06:12:46","guid":{"rendered":"https:\/\/ever-powers.com\/?post_type=product&p=1793"},"modified":"2026-09-09T06:18:09","modified_gmt":"2026-09-09T06:18:09","slug":"crawler-crane-frame-support-hydraulic-cylinder-hcyy11112020","status":"publish","type":"product","link":"https:\/\/ever-powers.com\/it\/product\/crawler-crane-frame-support-hydraulic-cylinder-hcyy11112020\/","title":{"rendered":"Crawler Crane Frame Support Hydraulic Cylinder \u2014 HCYY11112020"},"content":{"rendered":"
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SEO Keyword Research \u2014 HCYY11112020<\/h2>\n

Primary Keyword:<\/strong> crawler crane frame support hydraulic cylinder<\/p>\n

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Long-tail Keywords:<\/strong> OEM replacement crawler crane outrigger cylinder, buy crawler crane frame support cylinder 170mm bore, custom crane support jack hydraulic cylinder, heavy duty crawler crane stabiliser cylinder manufacturer, crawler crane ground support cylinder supplier<\/p>\n<\/div>\n

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HCYY11112020 \u2014 Crawler Crane Frame Support Hydraulic Cylinder<\/h2>\n

The crawler crane frame support hydraulic cylinder<\/strong> 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.<\/p>\n

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Product Overview<\/h2>\n

A crawler crane’s own weight \u2014 plus the weight of its boom, counterweights, and any suspended load \u2014 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.<\/p>\n

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 \u2014 which acts through the 150 mm rod annular area \u2014 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\u00d7 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.<\/p>\n

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.<\/p>\n

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Technical Specifications<\/h2>\n

\"HCYY11112020<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Specification<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Cylinder Model<\/strong><\/td>\nHCYY11112020<\/td>\n<\/tr>\n
Specification<\/strong><\/td>\n\u03a6170\u00d7\u03a6150\u00d7800 mm (Bore \u00d7 Rod \u00d7 Stroke)<\/td>\n<\/tr>\n
Bore Diameter<\/strong><\/td>\n170 mm<\/td>\n<\/tr>\n
Rod Diameter<\/strong><\/td>\n150 mm (88% rod-to-bore ratio)<\/td>\n<\/tr>\n
Stroke<\/strong><\/td>\n800 mm<\/td>\n<\/tr>\n
Working Pressure<\/strong><\/td>\n30 MPa<\/td>\n<\/tr>\n
Maximum Withstand Pressure<\/strong><\/td>\n40 MPa<\/td>\n<\/tr>\n
Installation Distance<\/strong><\/td>\n1,140 mm<\/td>\n<\/tr>\n
Weight<\/strong><\/td>\n262 kg<\/td>\n<\/tr>\n
Extension Force (at 30 MPa)<\/strong><\/td>\n680.7 kN<\/td>\n<\/tr>\n
Retraction Force<\/strong><\/td>\n151.5 kN<\/td>\n<\/tr>\n
Euler Buckling Safety Factor<\/strong><\/td>\n4.8\u00d7 at rated load<\/td>\n<\/tr>\n
Body Mount<\/strong><\/td>\nSquare flange, top body<\/td>\n<\/tr>\n
Rod End Mount<\/strong><\/td>\nFork clevis<\/td>\n<\/tr>\n
Rod Material<\/strong><\/td>\n42CrMo4 alloy steel + Charpy toughness certification<\/td>\n<\/tr>\n
Compliance<\/strong><\/td>\nEN 13135 structural component classification<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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Engineering Features<\/h2>\n

Bore Diameter \u2014 Ground Load Capability<\/h3>\n

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.<\/p>\n

Rod Diameter \u2014 Column Buckling Resistance<\/h3>\n

The 150 mm rod carries the compressive load over an 800 mm extended length. The Euler buckling safety factor of 4.8\u00d7 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 \u2014 high extension capacity, moderate retraction.<\/p>\n

Stroke Length \u2014 Levelling Range<\/h3>\n

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.<\/p>\n

Installation Distance \u2014 Frame Pocket Compatibility<\/h3>\n

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.<\/p>\n

Working Pressure and Maximum Withstand Pressure<\/h3>\n

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 \u2014 the highest transient pressure the cylinder can experience without permanent deformation. The 1.33\u00d7 ratio between rated and maximum pressure provides capacity for pressure transients generated by sudden load application \u2014 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.<\/p>\n

Square Flange Mount \u2014 Structural Load Distribution<\/h3>\n

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.<\/p>\n

42CrMo4 Rod with Charpy Toughness Certification<\/h3>\n

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

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Application Areas<\/h2>\n