{"id":1773,"date":"2026-09-08T05:16:41","date_gmt":"2026-09-08T05:16:41","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&#038;p=1773"},"modified":"2026-09-08T05:19:34","modified_gmt":"2026-09-08T05:19:34","slug":"crane-main-boom-lift-hydraulic-cylinder-hcyy11112021","status":"publish","type":"product","link":"https:\/\/metalite.net\/hi\/product\/crane-main-boom-lift-hydraulic-cylinder-hcyy11112021\/","title":{"rendered":"Crane Main Boom Lift Hydraulic Cylinder \u2014 HCYY11112021 (\u03a6280\u00d7\u03a6250, 31.5MPa)"},"content":{"rendered":"<div style=\"font-family: 'Segoe UI', Arial, sans-serif; color: #1a1a1a; max-width: 1100px; margin: 0 auto; padding: 0 16px; line-height: 1.7;\">\n<p><!-- SEO Keywords for this page: Core: crane main boom lift hydraulic cylinder Related: heavy duty boom cylinder, telescopic crane hydraulic cylinder, high pressure hydraulic cylinder, crane hydraulic actuator Long-tail: crane main boom lift hydraulic cylinder 280mm bore 31.5MPa | heavy duty hydraulic cylinder for mobile crane boom | custom crane boom cylinder manufacturer China --><\/p>\n<p><!-- Product Hero Section --><\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 32px; margin-bottom: 48px; align-items: flex-start;\">\n<div style=\"flex: 1 1 340px; min-width: 280px;\"><img decoding=\"async\" style=\"width: 100%; border-radius: 6px; display: block;\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021-Crane-Main-Boom-Lift-Hydraulic-Cylinder.webp\" alt=\"HCYY11112021 Crane Main Boom Lift Hydraulic Cylinder \u2013 \u03a6280 bore, 31.5MPa working pressure\" title=\"\"><\/p>\n<div style=\"display: flex; gap: 12px; margin-top: 12px;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" style=\"width: 48%; border-radius: 4px; display: block;\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021.webp\" alt=\"HCYY11112021 crane main boom cylinder side view\" width=\"706\" height=\"416\" title=\"\"><\/div>\n<\/div>\n<div style=\"flex: 1 1 340px; min-width: 280px;\">\n<p style=\"font-size: 13px; color: #666; margin: 0 0 8px 0; text-transform: uppercase; letter-spacing: 0.05em;\">Model: HCYY11112021<\/p>\n<h2 style=\"font-size: 28px; font-weight: bold; color: #0d2d52; margin: 0 0 16px 0; line-height: 1.3;\">Crane Main Boom Lift Hydraulic Cylinder<\/h2>\n<p style=\"font-size: 16px; color: #333; margin: 0 0 24px 0;\">The <strong>crane main boom lift hydraulic cylinder<\/strong> HCYY11112021 is the primary actuator responsible for elevating the entire boom assembly of a mobile or truck-mounted crane. With a \u03a6280mm bore, a 3,507mm stroke, and a rated working pressure of 31.5MPa, this cylinder is built to handle the enormous bending moments and dynamic loads that occur during full-capacity lifts \u2014 the operational conditions where component failures carry the highest consequences.<\/p>\n<div style=\"background: #f0f4fa; border-left: 4px solid #1a5fa8; padding: 16px 20px; border-radius: 0 6px 6px 0; margin-bottom: 24px;\">\n<p style=\"margin: 0; font-size: 15px; color: #1a5fa8; font-weight: 600;\">Key Specifications at a Glance<\/p>\n<ul style=\"margin: 10px 0 0 0; padding-left: 18px; color: #333; font-size: 14px;\">\n<li style=\"margin-bottom: 4px;\">Bore \u00d7 Rod \u00d7 Stroke: \u03a6280 \u00d7 \u03a6250 \u00d7 3507 mm<\/li>\n<li style=\"margin-bottom: 4px;\">Working Pressure: 31.5 MPa<\/li>\n<li style=\"margin-bottom: 4px;\">Max Withstand Pressure: 39 MPa<\/li>\n<li style=\"margin-bottom: 4px;\">Installation Distance: 4,218 mm<\/li>\n<li>Weight: 1,155 kg<\/li>\n<\/ul>\n<\/div>\n<p><a style=\"display: inline-block; background: #1a5fa8; color: #fff; padding: 13px 28px; border-radius: 4px; text-decoration: none; font-weight: 600; font-size: 15px;\" href=\"#contact-cta\">Request a Quote or Technical Drawing<\/a><\/p>\n<\/div>\n<\/div>\n<p><!-- Section 1: Product Overview --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">What the Heavy-Duty Boom Cylinder Actually Does Inside a Crane<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">In a mobile crane, the main boom is not a rigid structure \u2014 it is a dynamic load arm that pivots at the base and must be raised and held at precise elevation angles under rated load conditions. The main boom lift hydraulic cylinder is the single component that controls that pivot. When a crane is lifting at maximum capacity, the cylinder rod is under combined axial compression and transverse bending force simultaneously. At full extension, it must maintain position without drift \u2014 any slow hydraulic leak or seal failure translates directly into uncontrolled boom descent.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The HCYY11112021 is designed to address precisely these conditions. Its \u03a6250mm rod diameter is not arbitrary \u2014 a rod this size has the cross-sectional area and second moment of area needed to resist buckling under the eccentric loads that occur when a boom is angled and loaded asymmetrically. The 3,507mm stroke allows the boom to sweep through a wide elevation arc while the 4,218mm installation distance \u2014 measured pin-to-pin at full retraction \u2014 accounts for the geometric constraints of typical crane chassis design.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">At 1,155 kg, this is a heavy-duty industrial actuator. It is appropriate for truck-mounted cranes, all-terrain cranes, rough-terrain cranes, and crawler cranes in the 25-tonne to 200-tonne capacity range where main boom geometry demands cylinders of this bore class.<\/p>\n<p><!-- Installation Diagram --><\/p>\n<div style=\"background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px; margin: 32px 0;\">\n<p style=\"margin: 0 0 12px 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">Installation Position Diagram \u2014 HCYY11112021 \/ 22 \/ 23 on Crane<\/p>\n<p><img decoding=\"async\" style=\"width: 100%; border-radius: 4px; display: block;\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021-2-3-Crane-Hydraulic-Cylinder-Location-Diagram-scaled.webp\" alt=\"HCYY11112021 22 23 crane hydraulic cylinder installation location diagram\" title=\"\"><\/p>\n<p style=\"margin: 12px 0 0 0; font-size: 13px; color: #666;\">The diagram shows the mounting positions of the main boom lift cylinder (HCYY11112021), outrigger extension cylinder (HCYY11112022), and outrigger jack cylinder (HCYY11112023) within the crane structure.<\/p>\n<\/div>\n<p><!-- Section 2: Technical Specs Table --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">Full Technical Specifications for the HCYY11112021 Crane Main Boom Lift Hydraulic Cylinder<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 20px 0;\">Every parameter in the table below is derived from crane structural analysis and hydraulic system design requirements. Understanding what each figure means in practice matters more than the numbers themselves \u2014 we explain each one below the table.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1768\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021-Crane-Main-Boom-Lift-Hydraulic-Cylinder-CAD.webp\" alt=\"HCYY11112021 Crane Main Boom Lift Hydraulic Cylinder CAD\" width=\"701\" height=\"366\" title=\"\" srcset=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021-Crane-Main-Boom-Lift-Hydraulic-Cylinder-CAD.webp 701w, https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021-Crane-Main-Boom-Lift-Hydraulic-Cylinder-CAD-480x251.webp 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 701px, 100vw\" \/><\/p>\n<p><!-- Specs Table --><\/p>\n<div style=\"overflow-x: auto; margin-bottom: 28px;\">\n<table style=\"width: 100%; border-collapse: collapse; font-size: 14px; min-width: 600px;\">\n<thead>\n<tr style=\"background: #0d2d52; color: #fff;\">\n<th style=\"padding: 12px 14px; text-align: left; font-weight: 600;\">Parameter<\/th>\n<th style=\"padding: 12px 14px; text-align: left; font-weight: 600;\">Value<\/th>\n<th style=\"padding: 12px 14px; text-align: left; font-weight: 600;\">Engineering Significance<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; font-weight: 600; color: #0d2d52;\">Model<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2;\">HCYY11112021<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Unique product identifier for procurement and spare parts<\/td>\n<\/tr>\n<tr style=\"background: #f7f9fc;\">\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; font-weight: 600; color: #0d2d52;\">Specifications<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2;\">\u03a6280 \u00d7 \u03a6250 \u00d7 3507 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Bore \u00d7 Rod diameter \u00d7 Stroke. The \u03a6250 rod is 89% of bore diameter \u2014 this ratio is unusually high and indicates the cylinder is designed to resist significant compressive side loads.<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; font-weight: 600; color: #0d2d52;\">Working Pressure<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2;\">31.5 MPa<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Sustained operational pressure. At \u03a6280 bore, this generates approximately 1,940 kN (197 tonnes) of theoretical push force.<\/td>\n<\/tr>\n<tr style=\"background: #f7f9fc;\">\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; font-weight: 600; color: #0d2d52;\">Max Withstand Pressure<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2;\">39 MPa<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Proof test pressure \u2014 1.24\u00d7 working pressure safety factor. This ensures structural integrity under dynamic shock loads and emergency braking.<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; font-weight: 600; color: #0d2d52;\">Stroke<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2;\">3,507 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Total rod travel. Determines the angular range of boom elevation from minimum to maximum angle.<\/td>\n<\/tr>\n<tr style=\"background: #f7f9fc;\">\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; font-weight: 600; color: #0d2d52;\">Installation Distance<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2;\">4,218 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Pin-to-pin distance at full retraction. Critical for crane chassis frame design and boom pivot geometry calculations.<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 11px 14px; font-weight: 600; color: #0d2d52;\">Weight<\/td>\n<td style=\"padding: 11px 14px;\">1,155 kg<\/td>\n<td style=\"padding: 11px 14px; color: #555;\">Structural mass at this scale is inherent; weight is managed through optimized wall thickness and material selection, not compromised by weight reduction that would affect strength.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><!-- Section 3: Why These Specs Matter --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">Why a 280mm Bore and 31.5MPa Matters for Crane Main Boom Lift Hydraulic Cylinder Selection<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">Specifying the wrong bore diameter for a crane boom cylinder is one of the most common engineering errors in crane rebuilds and aftermarket replacements. Undersizing the bore forces the hydraulic system to operate at elevated pressure to generate equivalent force \u2014 this accelerates wear on seals, increases heat generation in the hydraulic fluid, and reduces the operational life of both the cylinder and the pump.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">A \u03a6280mm bore at 31.5MPa delivers approximately <strong>1,940 kN of extension force<\/strong> on the push stroke. For the retraction stroke, the effective area is reduced by the rod cross-section (\u03a6250mm rod area = 49,087 mm\u00b2), giving approximately <strong>550 kN of pull force<\/strong> \u2014 this asymmetric force profile is typical of boom lift cylinders, where the extension (lifting) force must be significantly higher than retraction.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The maximum withstand pressure of 39MPa means the cylinder barrel, end caps, and rod seal assemblies are tested and validated beyond the rated working pressure. This is particularly important in crane applications where hydraulic pressure spikes occur during dynamic load swinging, sudden braking of the slew rotation, or wind-induced boom oscillation.<\/p>\n<p><!-- Section 4: Applications --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">Typical Applications for Heavy-Duty Hydraulic Cylinder Crane Main Boom Systems<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The HCYY11112021 is suited to crane types and applications where large bore, long-stroke main boom cylinders are standard. Typical deployment scenarios include:<\/p>\n<ul style=\"padding-left: 20px; color: #333; font-size: 15px; margin: 0 0 20px 0;\">\n<li style=\"margin-bottom: 10px;\"><strong>Truck-mounted cranes (25t\u2013200t):<\/strong> Used in construction sites, utilities, and oil field operations where the boom must be elevated rapidly under full rated load.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>All-terrain cranes:<\/strong> The cylinder must tolerate vibration and shock loads transmitted through the chassis over rough terrain while maintaining boom elevation.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Rough-terrain cranes:<\/strong> Single-engine machines where hydraulic efficiency matters \u2014 a properly sized bore means less engine power consumed to maintain boom position.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Industrial plant cranes:<\/strong> Used in steel mills, shipyards, and heavy industrial facilities where long service intervals and leak-free operation are non-negotiable.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>OEM crane manufacturing:<\/strong> Procurement for new crane builds where consistent dimensional accuracy across batches is required for production line assembly.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Crane refurbishment and MRO:<\/strong> Replacement of worn or damaged main boom cylinders where the original OEM part is obsolete or has extended lead times.<\/li>\n<\/ul>\n<p><!-- Section 5: Design & Quality Features --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">Construction Details That Define Long-Term Reliability of a Custom Crane Boom Cylinder<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">In crane boom cylinders of this bore class, the difference between a cylinder that lasts 10,000 hours and one that fails at 2,000 hours comes down to manufacturing precision and material specification \u2014 not just rated pressure.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 28px;\">\n<div style=\"flex: 1 1 280px; background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px;\">\n<p style=\"margin: 0 0 8px 0; font-weight: bold; color: #0d2d52; font-size: 15px;\">Cylinder Barrel<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Seamless cold-drawn steel tubing, honed internally to Ra 0.2\u20130.4\u03bcm surface finish. This finish range is the critical zone for piston seal service life \u2014 too rough accelerates seal wear; too smooth prevents the oil film that seals require.<\/p>\n<\/div>\n<div style=\"flex: 1 1 280px; background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px;\">\n<p style=\"margin: 0 0 8px 0; font-weight: bold; color: #0d2d52; font-size: 15px;\">Piston Rod<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Hard chrome plated to 20\u201325\u03bcm thickness on 45# or 40Cr steel substrate. Chrome plating on a \u03a6250mm rod must be uniform in thickness to avoid differential hardness zones that can crack under bending load.<\/p>\n<\/div>\n<div style=\"flex: 1 1 280px; background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px;\">\n<p style=\"margin: 0 0 8px 0; font-weight: bold; color: #0d2d52; font-size: 15px;\">Seal System<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Multi-component seal stack using polyurethane rod seals with PTFE backup rings. Rod wiper seals are inboard of the primary seals to prevent particulate contamination from reaching the pressurized cavity.<\/p>\n<\/div>\n<div style=\"flex: 1 1 280px; background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px;\">\n<p style=\"margin: 0 0 8px 0; font-weight: bold; color: #0d2d52; font-size: 15px;\">End Caps &amp; Ports<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Forged steel end caps, threaded or flanged connection depending on application. Hydraulic ports are machined to SAE or BSP standards to match crane OEM hydraulic circuit specifications.<\/p>\n<\/div>\n<div style=\"flex: 1 1 280px; background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px;\">\n<p style=\"margin: 0 0 8px 0; font-weight: bold; color: #0d2d52; font-size: 15px;\">Surface Treatment<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">External surfaces receive industrial epoxy primer followed by topcoat, matched to customer specification. Trunnion and clevis pin bores are precision-machined after surface treatment to maintain dimensional accuracy.<\/p>\n<\/div>\n<div style=\"flex: 1 1 280px; background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px;\">\n<p style=\"margin: 0 0 8px 0; font-weight: bold; color: #0d2d52; font-size: 15px;\">Pressure Testing<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Each cylinder is pressure tested to 39MPa (max withstand pressure) before shipment. Test records are retained for traceability. No external leakage is permitted at test pressure during a minimum 5-minute hold.<\/p>\n<\/div>\n<\/div>\n<p><!-- Section 6: Ordering & Customization --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">Ordering the Right Crane Main Boom Lift Hydraulic Cylinder: What to Confirm Before Procurement<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">For crane OEMs and MRO procurement teams, getting the dimensional and pressure specifications confirmed before placing an order prevents costly installation failures. The following information is needed to confirm the HCYY11112021 is the correct fit or to specify a custom variant:<\/p>\n<ul style=\"padding-left: 20px; color: #333; font-size: 15px; margin: 0 0 20px 0;\">\n<li style=\"margin-bottom: 10px;\"><strong>Pin bore diameters:<\/strong> The clevis\/trunnion pin bore dimensions at both head and rod end must match the crane boom pivot hardware. Standard and custom bore sizes are available.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Port type and size:<\/strong> Specify SAE straight-thread, BSPP, or NPT port configuration and size to match the crane&#8217;s hydraulic circuit fittings.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Cushion end requirement:<\/strong> For cranes where the boom reaches end-of-stroke at speed, a hydraulic cushion at retraction end reduces impact loading. Confirm whether internal cushioning is required.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Seal material:<\/strong> Standard polyurethane seals suit mineral hydraulic oil. If the crane operates with fire-resistant fluid (HFA, HFB, or HFC type), Viton or EPDM seal materials must be specified.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Quantity and delivery schedule:<\/strong> For OEM production runs, minimum order quantities and batch delivery scheduling can be agreed. Sample orders for engineering validation are accepted.<\/li>\n<\/ul>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">CAD drawings (DXF\/PDF format) are available upon request after confirming your application details. Dimensional tolerances are held to ISO 6020\/6022 or customer standard, whichever is more stringent.<\/p>\n<p><!-- CAD Image --><\/p>\n<div style=\"background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px; margin: 32px 0;\">\n<p style=\"margin: 0 0 12px 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">HCYY11112021 CAD Drawing Reference<\/p>\n<p><img decoding=\"async\" style=\"width: 100%; border-radius: 4px; display: block;\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112021-Crane-Main-Boom-Lift-Hydraulic-Cylinder-CAD.webp\" alt=\"HCYY11112021 crane main boom lift hydraulic cylinder CAD technical drawing\" title=\"\"><\/p>\n<p style=\"margin: 12px 0 0 0; font-size: 13px; color: #666;\">Full-dimension CAD drawing available in DXF and PDF format. Contact us with your application details to receive the drawing package.<\/p>\n<\/div>\n<p><!-- FAQ Section --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 48px 0 20px 0;\">Frequently Asked Questions About the HCYY11112021 Hydraulic Cylinder for Crane Main Boom Applications<\/h2>\n<div style=\"margin-bottom: 16px; border: 1px solid #dce6f0; border-radius: 6px; overflow: hidden;\">\n<div style=\"background: #f0f4fa; padding: 14px 18px;\">\n<p style=\"margin: 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">Q: Can this cylinder be used as a direct replacement for other brand crane boom cylinders with the same bore and stroke?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Not automatically. The bore and stroke may match, but pin bore diameters, port locations, port thread types, and overall installation length (4,218mm) must all be verified against the original cylinder. We recommend requesting a dimensional comparison drawing before ordering a replacement unit.<\/p>\n<\/div>\n<\/div>\n<div style=\"margin-bottom: 16px; border: 1px solid #dce6f0; border-radius: 6px; overflow: hidden;\">\n<div style=\"background: #f0f4fa; padding: 14px 18px;\">\n<p style=\"margin: 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">Q: What is the rated push force at 31.5MPa working pressure?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">At 31.5MPa with a \u03a6280mm bore (effective area \u2248 61,575 mm\u00b2), the theoretical push force is approximately 1,940 kN (approximately 197 tonnes-force). Actual usable force accounts for seal friction and hydraulic system losses, typically 3\u20135% of theoretical.<\/p>\n<\/div>\n<\/div>\n<div style=\"margin-bottom: 16px; border: 1px solid #dce6f0; border-radius: 6px; overflow: hidden;\">\n<div style=\"background: #f0f4fa; padding: 14px 18px;\">\n<p style=\"margin: 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">Q: Is rod buckling a concern at a 3,507mm stroke with a \u03a6250mm rod?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">The slenderness ratio for this rod is within accepted limits for guided cylinder applications. Crane boom cylinders are always mounted with both ends constrained (trunnion or clevis both ends), which significantly increases the Euler critical buckling load compared to a free-standing column. The \u03a6250mm rod diameter was selected specifically to maintain an adequate safety margin against buckling under maximum working load.<\/p>\n<\/div>\n<\/div>\n<div style=\"margin-bottom: 16px; border: 1px solid #dce6f0; border-radius: 6px; overflow: hidden;\">\n<div style=\"background: #f0f4fa; padding: 14px 18px;\">\n<p style=\"margin: 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">Q: What is the lead time for this cylinder?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Lead time depends on order quantity and whether the unit is from standard production or a modified specification. Standard production units typically ship within 4\u20138 weeks. For OEM volume orders, a production schedule will be agreed upon order confirmation. Contact us with your required delivery date and we will advise on feasibility.<\/p>\n<\/div>\n<\/div>\n<div style=\"margin-bottom: 16px; border: 1px solid #dce6f0; border-radius: 6px; overflow: hidden;\">\n<div style=\"background: #f0f4fa; padding: 14px 18px;\">\n<p style=\"margin: 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">Q: Can the port size and thread type be customized?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Yes. Ports are machined to order and can be supplied in SAE straight-thread (O-ring face seal), BSPP, BSPT, or metric thread to match your hydraulic circuit. Port size is selected to maintain acceptable fluid velocity at the cylinder&#8217;s maximum flow rate \u2014 we will advise if your specified port size would create excessive pressure drop.<\/p>\n<\/div>\n<\/div>\n<p><!-- CTA Section --><\/p>\n<div id=\"contact-cta\" style=\"background: linear-gradient(135deg, #0d2d52 0%, #1a5fa8 100%); color: #fff; border-radius: 8px; padding: 36px 32px; margin: 48px 0 32px 0; text-align: center;\">\n<p style=\"font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; margin: 0 0 10px 0; opacity: 0.8;\">B2B Procurement &amp; OEM Supply<\/p>\n<h2 style=\"font-size: 26px; font-weight: bold; color: #fff; margin: 0 0 16px 0; border: none; padding: 0;\">Ready to Specify or Order the HCYY11112021?<\/h2>\n<p style=\"font-size: 15px; opacity: 0.9; max-width: 620px; margin: 0 auto 28px auto; line-height: 1.7;\">Send us your crane model, current cylinder dimensions, and required quantity. We will confirm dimensional compatibility, provide a CAD drawing for your engineering review, and issue a formal quotation \u2014 typically within 24\u201348 business hours.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 14px; justify-content: center;\"><a style=\"display: inline-block; background: #fff; color: #0d2d52; padding: 13px 28px; border-radius: 4px; text-decoration: none; font-weight: bold; font-size: 15px;\" href=\"\/hi\/contact\/\">Request a Quote<\/a><br \/>\n<a style=\"display: inline-block; background: transparent; color: #fff; padding: 13px 28px; border-radius: 4px; text-decoration: none; font-weight: 600; font-size: 15px; border: 2px solid rgba(255,255,255,0.6);\" href=\"\/hi\/contact\/\">Request CAD Drawing<\/a><br \/>\n<a style=\"display: inline-block; background: transparent; color: #fff; padding: 13px 28px; border-radius: 4px; text-decoration: none; font-weight: 600; font-size: 15px; border: 2px solid rgba(255,255,255,0.6);\" href=\"\/hi\/contact\/\">Bulk Order Enquiry<\/a><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>HCYY11112021 crane main boom lift hydraulic cylinder: \u03a6280mm bore, 31.5MPa, 3507mm stroke, 1155kg. OEM and MRO supply with CAD drawings. Request a quote.<\/p>","protected":false},"featured_media":1753,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[106],"product_tag":[],"class_list":["post-1773","product","type-product","status-publish","has-post-thumbnail","product_cat-crane-hydraulic-cylinder","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/product\/1773","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/media\/1753"}],"wp:attachment":[{"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/media?parent=1773"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/product_brand?post=1773"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/product_cat?post=1773"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/metalite.net\/hi\/wp-json\/wp\/v2\/product_tag?post=1773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}