{"id":1779,"date":"2026-09-08T05:39:32","date_gmt":"2026-09-08T05:39:32","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&#038;p=1779"},"modified":"2026-09-08T05:40:40","modified_gmt":"2026-09-08T05:40:40","slug":"crane-front-outrigger-jack-hydraulic-cylinder-hcyy11112025","status":"publish","type":"product","link":"https:\/\/metalite.net\/ko\/product\/crane-front-outrigger-jack-hydraulic-cylinder-hcyy11112025\/","title":{"rendered":"Crane Front Outrigger Jack Hydraulic Cylinder \u2014 HCYY11112025 (\u03a680\u00d7\u03a660, 18MPa)"},"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 front outrigger jack hydraulic cylinder Related: front outrigger vertical jack cylinder, crane front stabilizer jack, front leg jack actuator, crane front support cylinder Long-tail: crane front outrigger jack hydraulic cylinder 80mm bore 18MPa | vertical jack cylinder for crane front outrigger position | front stabilizer jack hydraulic cylinder manufacturer --><\/p>\n<p>&nbsp;<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 32px; margin-bottom: 48px; align-items: flex-start;\">\n<p><!-- Spec card --><\/p>\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: HCYY11112025<\/p>\n<h2 style=\"font-size: 28px; font-weight: bold; color: #0d2d52; margin: 0 0 16px 0; line-height: 1.3;\">Crane Front Outrigger Jack Hydraulic Cylinder<\/h2>\n<p style=\"font-size: 16px; color: #333; margin: 0 0 24px 0;\">The <strong>crane front outrigger jack hydraulic cylinder<\/strong> HCYY11112025 is the vertical actuator that drives the front outrigger pad into the ground and holds the front of the crane chassis elevated and level throughout the lift cycle. With a \u03a680mm bore, a 790mm stroke, and an 18MPa working pressure, this cylinder is purpose-specified for the front outrigger jack position \u2014 where the vertical load, chassis geometry, and circuit pressure differ from the rear jack position in ways that make a position-specific design essential.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1749\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112025-Crane-Front-Outrigger-Jack-Hydraulic-Cylinder-1024x1024.webp\" alt=\"HCYY11112025 Crane Front Outrigger Jack Hydraulic Cylinder\" width=\"600\" height=\"600\" title=\"\"><\/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: \u03a680 \u00d7 \u03a660 \u00d7 790 mm<\/li>\n<li style=\"margin-bottom: 4px;\">Working Pressure: 18 MPa<\/li>\n<li style=\"margin-bottom: 4px;\">Max Withstand Pressure: 27 MPa<\/li>\n<li style=\"margin-bottom: 4px;\">Installation Distance: 1,112 mm<\/li>\n<li>Weight: 45 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=\"#contacts\">Request a Quote or Technical Drawing<\/a><\/p>\n<\/div>\n<\/div>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 1: Product overview \u2014 side image: product detail\/side view \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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 Front Outrigger Jack Cylinder Does \u2014 and Why the Front Position Has Its Own Specification<\/h2>\n<div style=\"display: flex; flex-wrap: wrap; gap: 28px; align-items: flex-start; margin-bottom: 24px;\">\n<div style=\"flex: 1 1 260px; min-width: 220px;\"><img decoding=\"async\" style=\"width: 100%; border-radius: 6px; display: block;\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112025.webp\" alt=\"HCYY11112025 front outrigger jack cylinder product detail view\" title=\"\"><\/div>\n<div style=\"flex: 2 1 340px; min-width: 280px;\">\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">Once the front outrigger beam is extended by the HCYY11112024 extension cylinder, the jack cylinder takes over: it drives the outrigger pad vertically downward until it contacts the ground, then continues extending to lift the front of the crane chassis clear of its suspension. From that point until the lift operation is complete, the HCYY11112025 holds the front of the crane under sustained compressive load \u2014 the same static load-holding duty as the rear jack cylinder (HCYY11112027), but at different pressure and bore parameters that reflect the front axle&#8217;s specific load share.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">On most truck-mounted crane designs, the front outrigger jack carries a different proportion of the total crane weight than the rear. The front axle position relative to the boom pivot and counterweight determines whether the front jacks are carrying more or less load than the rear. In many configurations, the front jacks carry a lower share of the total crane weight \u2014 which is why the front jack cylinder is rated at 18MPa rather than the 30MPa of the main outrigger jack (HCYY11112023). This is deliberate sizing, not a quality difference.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 0 0;\">At 18MPa across a \u03a680mm bore, the HCYY11112025 generates approximately <strong>90 kN of vertical push force<\/strong> \u2014 approximately 9.2 tonnes-force per front jack position. The 790mm stroke gives adequate height adjustment range for levelling on typical uneven ground conditions encountered at construction and industrial sites.<\/p>\n<\/div>\n<\/div>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 INSTALLATION DIAGRAM \u2014 placed within the application context \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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 \u2014 HCYY11112024 \/ 25 \/ 26 \/ 27 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\/HCYY11112024-5-6-7-Crane-Hydraulic-Cylinder-Location-Diagram-scaled.webp\" alt=\"HCYY11112025 crane front outrigger jack cylinder installation position diagram\" title=\"\"><\/p>\n<p style=\"margin: 12px 0 0 0; font-size: 13px; color: #666;\">The diagram shows how the front outrigger jack cylinder (HCYY11112025) sits within the front outrigger assembly alongside the front extension cylinder (HCYY11112024), and how the front and rear outrigger circuits are geometrically distinct from each other.<\/p>\n<\/div>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 2: Technical specs table \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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 HCYY11112025 Front Stabilizer Jack Hydraulic Cylinder<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 20px 0;\">Each parameter in the table below reflects a specific design decision for the front outrigger jack position. The notes explain why these values are appropriate for front-position loading, and where they differ from the rear jack cylinder specification.<\/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;\">HCYY11112025<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Front outrigger jack position. Not interchangeable with the rear jack (HCYY11112027) due to differences in stroke, installation distance, and rod diameter.<\/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;\">\u03a680 \u00d7 \u03a660 \u00d7 790 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Bore \u00d7 Rod \u00d7 Stroke. The \u03a660mm rod gives a 75% rod-to-bore ratio \u2014 appropriate for a vertical compressive application where buckling resistance over the 790mm stroke is well within acceptable limits.<\/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;\">18 MPa<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Front-circuit pressure. Lower than the main outrigger jack (30MPa) \u2014 calibrated to the front axle load share on this crane class. At \u03a680mm bore (area \u2248 5,027 mm\u00b2), this generates approximately 90 kN of vertical 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;\">27 MPa<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">1.5\u00d7 safety factor over working pressure. Provides structural margin for ground reaction spikes and load redistribution events without barrel deformation.<\/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;\">790 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Longer than the rear jack stroke (420mm) \u2014 the front outrigger position typically requires greater vertical travel to accommodate the chassis height above ground at the front axle position and the terrain height variation range.<\/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;\">1,112 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; color: #555;\">Pin-to-pin retracted length. Sets the vertical packaging envelope in the front outrigger beam&#8217;s lower section. Verify against your chassis bracket spacing before ordering.<\/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;\">45 kg<\/td>\n<td style=\"padding: 11px 14px; color: #555;\">Two-person field replacement is manageable. At 45kg, no specialist lifting equipment is needed for removal and installation, which reduces downtime in field maintenance scenarios.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 3: 18MPa pressure logic + front vs rear \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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 18MPa Is the Correct Working Pressure for the Front Outrigger Jack \u2014 and What Happens If You Substitute a Higher-Pressure Unit<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">A common question from procurement engineers is whether a higher-pressure cylinder can simply replace a lower-pressure one \u2014 the assumption being that &#8220;more pressure capacity is always better.&#8221; In outrigger jack circuits, this logic creates a practical problem: the relief valve setting and counterbalance valve pre-charge in the front outrigger circuit are calibrated to 18MPa. If a cylinder with a higher pressure rating is installed but the circuit relief valve is still set at 18MPa, the cylinder is operating correctly \u2014 but if the relief valve is then adjusted upward to &#8220;match&#8221; the new cylinder&#8217;s capacity, the front jack can develop more force than the front outrigger beam structure and chassis mounting brackets were designed to sustain.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The 18MPa rating of the HCYY11112025 is a system-level specification, not merely a cylinder capability. It defines the pressure at which the complete front outrigger circuit \u2014 cylinder, hoses, valves, fittings, and chassis mounting \u2014 is designed to operate. Replacing only the cylinder while leaving the rest of the circuit unchanged is acceptable; changing the circuit pressure to accommodate a different cylinder is not, without a full structural review of the front outrigger assembly.<\/p>\n<p><!-- Front vs Rear comparison table --><\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The front and rear outrigger jack cylinders on this crane share the same bore but differ in stroke, installation distance, and rod diameter \u2014 differences that prevent cross-fitting:<\/p>\n<div style=\"overflow-x: auto; margin-bottom: 12px;\">\n<table style=\"width: 100%; border-collapse: collapse; font-size: 14px; min-width: 500px;\">\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: center; font-weight: 600;\">Front Jack (HCYY11112025)<\/th>\n<th style=\"padding: 12px 14px; text-align: center; font-weight: 600;\">Rear Jack (HCYY11112027)<\/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;\">Bore \u00d7 Rod<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; text-align: center;\">\u03a680 \u00d7 \u03a660<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; text-align: center;\">\u03a670 \u00d7 \u03a655<\/td>\n<\/tr>\n<tr style=\"background: #f7f9fc;\">\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; text-align: center;\">790 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; text-align: center;\">420 mm<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\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; text-align: center;\">1,112 mm<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; text-align: center;\">640 mm<\/td>\n<\/tr>\n<tr style=\"background: #f7f9fc;\">\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; text-align: center;\">18 MPa<\/td>\n<td style=\"padding: 11px 14px; border-bottom: 1px solid #e0e8f2; text-align: center;\">20 MPa<\/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; text-align: center;\">45 kg<\/td>\n<td style=\"padding: 11px 14px; text-align: center;\">24 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size: 13px; color: #666; font-style: italic; margin: 0 0 32px 0;\">The front jack cylinder is larger in bore, longer in stroke, and heavier than the rear \u2014 reflecting the different chassis geometry and vertical travel requirements at the front axle position.<\/p>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 4: Static load holding \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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;\">Static Load Holding at the Front Outrigger Position \u2014 What 790mm of Stroke Means for Ground Levelling<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The 790mm stroke of the HCYY11112025 is almost double the 420mm stroke of the rear jack cylinder. This difference exists because the front of a truck-mounted crane chassis typically sits higher above the ground than the rear \u2014 the front axle suspension height, frame geometry, and bumper clearance requirements mean the front jack must travel further to bring the pad from its stowed position to firm ground contact and then continue to lift the chassis.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">The additional stroke also provides levelling capacity on sloped ground. When a crane is set up on a site with a cross-slope, the front jacks on the uphill and downhill sides extend by different amounts to level the chassis. The difference in extension between the two sides determines the effective levelling range \u2014 a 790mm stroke cylinder accommodating approximately \u00b1395mm of differential extension compared to a centred position, which translates to levelling capability on gradients of several degrees depending on the outrigger spread width.<\/p>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">Static load holding performance is governed by the same pressure-energised piston seal approach used in the main outrigger jack: sealing force increases proportionally with load, and zero internal leakage under a sustained 5-minute hold at 27MPa is the acceptance standard applied to every unit before shipment.<\/p>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 5: Applications \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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;\">Where the Front Leg Jack Actuator Is Used \u2014 Application Scenarios for the HCYY11112025<\/h2>\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\u2013100t class:<\/strong> Two front jack cylinders deploy in parallel with two rear jack cylinders to stabilise the crane before every lift. Front jacks must hold their position independently if the rear outrigger circuit is isolated for maintenance.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Cranes working on sloped terrain:<\/strong> The 790mm stroke allows the front jacks to compensate for front-to-rear height differences that occur when a crane sets up across a gradient \u2014 a scenario that is impossible to avoid on many construction and industrial sites.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Urban infrastructure projects:<\/strong> Where cranes set up in confined spaces with limited pad placement options, the front jacks may be deployed at varying extension lengths to navigate obstacles. Reliable partial-stroke operation is required.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Extended-duration lift operations:<\/strong> Industrial maintenance lifts that keep the crane deployed for hours or overnight. Sustained static load holding without drift is the primary performance requirement for these operations.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>OEM first-fit supply:<\/strong> Crane builders requiring front-specific jack cylinders with consistent production tolerances for assembly line integration.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>MRO replacement:<\/strong> Worn or damaged front jack cylinders where the original OEM specification has long lead times or is no longer available.<\/li>\n<\/ul>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 6: Construction details \u2014 CAD image placed here as reference \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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 and Material Standards for the HCYY11112025 Front Outrigger Jack Cylinder<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 24px 0;\">A front outrigger jack cylinder that holds position reliably through a full shift requires more than an adequate pressure rating \u2014 the material grade, seal configuration, and surface finish must each be specified for sustained static load, not just dynamic cycling.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 36px;\">\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 tube, honed to Ra 0.2\u20130.4\u03bcm. At \u03a680mm bore and 18MPa working pressure, wall thickness is calculated with a minimum burst safety factor of 4:1 over working pressure, ensuring structural integrity across the full cylinder length including the end cap thread engagement zones.<\/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;\">\u03a660mm Piston Rod<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">45# or 40Cr steel, hard chrome plated 20\u201325\u03bcm on a Ra 0.1\u03bcm ground substrate. Rod straightness is verified to 0.05mm per 300mm after plating. The 75% rod-to-bore ratio provides adequate column strength for the 790mm stroke under the vertical compressive loads of the front jack position.<\/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 Seal<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Pressure-energised seal design: contact force between seal lip and bore wall increases proportionally with hydraulic pressure. At 18MPa static hold, this produces a sealing force appropriate to prevent internal bypass without generating excessive friction on the rare occasions when the jack is repositioned under partial 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;\">Rod Seal and Wiper<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Polyurethane primary rod seal with PTFE backup ring and dual wiper seals. The outer wiper contacts the rod at the gland exit to remove surface contamination before it reaches the primary seal \u2014 a critical function for a cylinder mounted close to the ground and exposed to road debris and mud during transit.<\/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;\">Rod End Pad Interface<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">The rod end is machined to accept the outrigger pad (float) with a spherical or flat socket interface. The spherical option permits up to \u00b15\u00b0 angular deviation, preventing bending moment transmission into the rod when the pad contacts uneven ground. The contact face is heat-treated for wear resistance at the high local bearing stress generated by the crane point 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;\">Pressure Test<\/p>\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Each cylinder tested at 27MPa (full max withstand pressure), 5-minute hold at both full extension and full retraction. Zero internal leakage and zero external leakage are required at both positions. Test records are retained for traceability and available on request for quality audit.<\/p>\n<\/div>\n<\/div>\n<p><!-- CAD image with ordering context --><\/p>\n<div style=\"background: #f7f9fc; border: 1px solid #dce6f0; border-radius: 6px; padding: 20px; margin: 0 0 48px 0;\">\n<p style=\"margin: 0 0 12px 0; font-weight: 600; color: #0d2d52; font-size: 15px;\">HCYY11112025 \u2014 CAD Drawing for Dimensional Verification<\/p>\n<p><img decoding=\"async\" style=\"width: 100%; border-radius: 4px; display: block;\" src=\"https:\/\/metalite.net\/wp-content\/uploads\/2026\/09\/HCYY11112025-Crane-Front-Outrigger-Jack-Hydraulic-Cylinder-CAD.webp\" alt=\"HCYY11112025 crane front outrigger jack hydraulic cylinder CAD technical drawing with dimensions\" title=\"\"><\/p>\n<p style=\"margin: 12px 0 0 0; font-size: 13px; color: #666;\">Use the CAD drawing to verify pin bore positions, port locations, and installation distance against your crane&#8217;s front outrigger beam design before placing an order. Full DXF and PDF format available on request.<\/p>\n<\/div>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 SECTION 7: Ordering checklist \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/p>\n<h2 style=\"font-size: 22px; font-weight: bold; color: #0d2d52; border-bottom: 2px solid #e0e8f2; padding-bottom: 10px; margin: 0 0 20px 0;\">Ordering Checklist \u2014 What to Confirm Before Procuring the HCYY11112025<\/h2>\n<p style=\"font-size: 15px; color: #333; margin: 0 0 16px 0;\">Front and rear outrigger jack cylinders are frequently confused during procurement because the bore sizes are similar. Confirm the following before placing an order:<\/p>\n<ul style=\"padding-left: 20px; color: #333; font-size: 15px; margin: 0 0 32px 0;\">\n<li style=\"margin-bottom: 10px;\"><strong>Confirm front position (not rear):<\/strong> The front jack (HCYY11112025) has a 790mm stroke and 1,112mm installation distance. The rear jack (HCYY11112027) has a 420mm stroke and 640mm installation distance. Visually inspect and measure the existing cylinder before ordering.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Installation distance at full retraction (1,112mm):<\/strong> Measure pin-centre to pin-centre with the existing cylinder fully retracted. A replacement cylinder longer or shorter than the original will mislocate within the outrigger beam bracket geometry.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Rod end pad interface:<\/strong> Specify flat pad socket, spherical knuckle, or fixed eye. Confirm the articulation angle required and the pad pin or socket diameter at the rod end.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Head end mount:<\/strong> Trunnion, clevis, or flange. Confirm pin diameter and any spherical bearing requirement at the head end pin eye.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Port specification:<\/strong> Thread type (SAE, BSP, metric) and size. Confirm port location (head-end or rod-end supply) to match your outrigger circuit hose routing.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Hydraulic fluid type:<\/strong> Standard polyurethane seals for mineral oil. Fire-resistant fluid applications require Viton (FKM) seals \u2014 specify fluid type at time of order.<\/li>\n<\/ul>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 FAQ \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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 \u2014 HCYY11112025 Crane Front Outrigger Jack Hydraulic Cylinder<\/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: Why does the front jack have a longer stroke (790mm) than the rear jack (420mm) on the same crane?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">The front of a truck-mounted crane chassis typically sits higher above the ground than the rear \u2014 the front bumper height, frame curvature, and axle suspension geometry all contribute to a greater distance between the outrigger beam&#8217;s lower face and the ground. The front jack cylinder therefore needs a longer stroke to reach the ground from its stowed position and then continue extending to lift the chassis to the required height. The additional stroke also provides greater levelling range on sloped ground at the front outrigger position.<\/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 push force does this cylinder generate at 18MPa working pressure?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">At 18MPa with a \u03a680mm bore (effective area \u2248 5,027 mm\u00b2), theoretical push force is approximately 90.5 kN \u2014 around 9.2 tonnes-force. After accounting for seal friction (3\u20135%), usable force is approximately 86\u201387.8 kN. With two front jack cylinders deployed simultaneously, the total front vertical support capacity is approximately 172\u2013176 kN, or approximately 17.5\u201318 tonnes-force at the front outrigger positions.<\/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 front jack cylinder be operated independently if the rear outrigger circuit fails?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">The front and rear outrigger jack circuits are typically separate hydraulic circuits on cranes in this class, supplied from separate control valve sections. The front jacks can hold their position independently of the rear circuit. However, operating the crane with only front jacks deployed and rear jacks retracted \u2014 or vice versa \u2014 is not a permitted configuration under any crane load chart. If the rear circuit fails during a lift, the correct response is to lower the load, retract the boom, and restore the rear outrigger system before continuing.<\/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 there a risk of rod buckling at 790mm stroke with a \u03a660mm rod?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">No, within the normal mounting configuration. The slenderness ratio for a \u03a660mm rod at 790mm effective length (pin-pinned end conditions) is well below the threshold where Euler buckling becomes the dominant failure mode. The Euler critical buckling load for this rod geometry at this effective length exceeds the maximum hydraulic thrust by a comfortable margin \u2014 greater than 4:1. Buckling is not a design concern for this cylinder at its rated parameters and correct installation geometry.<\/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: How long should a front outrigger jack cylinder last before it requires resealing?<\/p>\n<\/div>\n<div style=\"background: #fff; padding: 14px 18px;\">\n<p style=\"margin: 0; font-size: 14px; color: #444;\">Service life depends heavily on maintenance practice and operating environment. In well-maintained crane fleets with regular rod cleaning and annual seal inspection, outrigger jack cylinders routinely achieve 8,000\u201312,000 operating hours before requiring reseal. The most common failure mode is wiper seal degradation allowing abrasive contamination past the rod seal \u2014 this is preventable with regular rod inspection and prompt wiper replacement when cracking or flattening is observed. External rod scoring from physical impact (contact with ground obstacles during deployment) shortens seal life significantly and may necessitate rod replacement rather than a simple reseal.<\/p>\n<\/div>\n<\/div>\n<p><!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 CTA \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 --><\/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;\">Source the HCYY11112025 for Your Crane&#8217;s Front Outrigger Jack Position<\/h2>\n<p style=\"font-size: 15px; opacity: 0.9; max-width: 620px; margin: 0 auto 28px auto; line-height: 1.7;\">Provide your crane make and model, the retracted installation distance of your existing front jack cylinder, fluid type, and required quantity. We will confirm dimensional compatibility, supply a CAD drawing for engineering sign-off, and issue a formal quotation within 24\u201348 business hours.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 14px; justify-content: center;\">\n<p><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=\"meilto:sales@metalite.net\">Bulk Order Enquiry<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>HCYY11112025 front outrigger jack cylinder: \u03a680mm bore, 18MPa, 790mm stroke, 1112mm installation distance, 45kg. OEM &amp; MRO supply with CAD drawings.<\/p>","protected":false},"featured_media":1749,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[106,103,21],"product_tag":[],"class_list":["post-1779","product","type-product","status-publish","has-post-thumbnail","product_cat-crane-hydraulic-cylinder","product_cat-engineering-vehicles-hydraulic-cylinders","product_cat-hydraulic-cylinders","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/product\/1779","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/media\/1749"}],"wp:attachment":[{"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/media?parent=1779"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/product_brand?post=1779"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/product_cat?post=1779"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/metalite.net\/ko\/wp-json\/wp\/v2\/product_tag?post=1779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}