{"id":1735,"date":"2026-09-07T01:29:16","date_gmt":"2026-09-07T01:29:16","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&p=1735"},"modified":"2026-09-07T01:32:33","modified_gmt":"2026-09-07T01:32:33","slug":"hcyy11112005-primary-boom-lift-hydraulic-cylinder","status":"publish","type":"product","link":"https:\/\/metalite.net\/sv\/produkt\/hcyy11112005-primary-boom-lift-hydraulic-cylinder\/","title":{"rendered":"Primary Boom Lift Hydraulic Cylinder \u2014 HCYY11112005 | Main Boom Angle Cylinder \u03a655\u00d7\u03a650\u00d7506, 21 MPa"},"content":{"rendered":"
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HCYY11112005 \u2014 Primary Boom Lift Hydraulic Cylinder (Main Boom Angle Cylinder)<\/h2>\n

The HCYY11112005 primary boom lift hydraulic cylinder<\/strong> functions as the main boom angle cylinder \u2014 the actuator responsible for raising and lowering the primary boom arm of a boom-type aerial work platform. Operating at 21 MPa with a 506 mm stroke, this cylinder controls the elevation arc that determines the platform’s working height. Its 1259.7 mm installation distance and 32 kg weight reflect its role as the structural backbone of the boom elevation mechanism.<\/p>\n

What distinguishes a main boom angle cylinder from a secondary or extension cylinder is the magnitude and directionality of the loads it carries. At maximum boom elevation, the angle cylinder is not just pushing \u2014 it is actively holding the boom against gravity, wind load, and the moment arm created by a fully-loaded platform basket at the end of the boom. The 21 MPa working pressure and 26.5 MPa maximum withstand pressure are dimensioned with this sustained load-holding role in mind.<\/p>\n

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Technical Specifications: Main Boom Angle Cylinder for 21 MPa Aerial Platform Systems<\/h2>\n
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Parameter<\/th>\nValue<\/th>\nEngineering Note<\/th>\n<\/tr>\n<\/thead>\n
Cylinder Model<\/td>\nHCY11112005<\/td>\nOEM reference number<\/td>\n<\/tr>\n
Specifications<\/td>\n\u03a655 \u00d7 \u03a650 \u00d7 506<\/td>\nBore \u00d855 mm \/ Rod \u00d850 mm \/ Stroke 506 mm<\/td>\n<\/tr>\n
Working Pressure<\/td>\n21 MPa<\/td>\nMatched to boom lift main circuit pressure<\/td>\n<\/tr>\n
Maximum Withstand Pressure<\/td>\n26.5 MPa<\/td>\n~1.26\u00d7 working pressure safety margin<\/td>\n<\/tr>\n
Stroke<\/td>\n506 mm<\/td>\nControls primary boom elevation arc<\/td>\n<\/tr>\n
Installation Distance<\/td>\n1259.7 mm<\/td>\nPin-to-pin retracted length \u2014 precision-critical for boom geometry<\/td>\n<\/tr>\n
Weight<\/td>\n32 kg<\/td>\nHeavier than secondary cylinders due to larger wall thickness<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Installation position reference \u2014 Main Boom Angle Cylinder in boom lift hydraulic layout<\/p>\n<\/div>\n

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The Engineering Case for a \u03a655 Bore with a \u03a650 Rod: Load-Holding Stability in Boom Angle Cylinders<\/h2>\n

The HCYY11112005 has an unusually high rod-to-bore ratio: \u00d850 mm rod versus \u00d855 mm bore gives a ratio of ~0.91. This is not a typographical error \u2014 it is a deliberate engineering choice for a main boom angle cylinder.<\/p>\n

A high rod-to-bore ratio maximizes the rod cross-sectional area, which has two critical benefits for this application. First, it dramatically increases buckling resistance. The main boom angle cylinder carries compressive load when the boom is elevated: the full weight of the boom structure, the extension boom, and the loaded platform basket acts through the cylinder as a compressive column force. A thick rod resists buckling at this long installation distance (1259.7 mm) far better than a slender one.<\/p>\n

Second, the annulus area (bore area minus rod area) on the retraction side is very small with a thick rod. This means the retraction force \u2014 the force pulling the boom down \u2014 is much lower than the extension force at the same pressure. For a gravity-lowering system where the boom descends under controlled hydraulic back-pressure, this asymmetry is intentional: it keeps the boom descending smoothly without the control valve having to handle excessive flow from the rod side.<\/p>\n

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Force Output and Application Sizing: OEM Replacement for Primary Boom Angle Cylinders<\/h2>\n

At 21 MPa working pressure, the \u00d855 mm bore produces approximately 49.9 kN of extension force<\/strong>. This is the force available to raise the primary boom. The actual boom-lifting moment depends on the cylinder attachment geometry (leverage arm length from the boom pivot), but for typical boom lifts in the 12\u201318 m working height class, this force output matches the load analysis for rated-capacity operation with the platform at maximum reach.<\/p>\n

When replacing the primary boom angle cylinder, it is critical to match not just the stroke and bore but the installation distance with precision. An error of even a few millimeters in the 1259.7 mm pin-to-pin dimension shifts the boom’s angle at full retraction, which can affect the platform leveling compensator calibration and the maximum reach geometry.<\/p>\n

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Applications: Main Boom Angle Cylinders for Articulating and Telescopic Boom Platforms<\/h2>\n