{"id":2571,"date":"2026-07-01T06:03:16","date_gmt":"2026-07-01T06:03:16","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/mobile-crane-luffing-cylinder\/"},"modified":"2026-07-01T06:03:28","modified_gmt":"2026-07-01T06:03:28","slug":"mobile-crane-luffing-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/es\/product\/mobile-crane-luffing-cylinder\/","title":{"rendered":"Mobile Crane Luffing Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n \"Mobile<\/p>\n
\n Mobile Crane Cylinder<\/span><\/p>\n

Mobile Crane Luffing Cylinder<\/h2>\n

The cylinder that sets every number on the crane’s load chart. Luffing controls boom angle \u2014 and boom angle determines reach, hook height, and maximum load at every working radius. The largest, highest-force, and most safety-critical hydraulic cylinder on any mobile crane.<\/p>\n

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560mm<\/span>Max Bore<\/span><\/div>\n
5,000mm<\/span>Max Stroke<\/span><\/div>\n
36 MPa<\/span>Pressure<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

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What the Luffing Cylinder Does \u2014 And Why It Defines the Crane<\/span><\/h2>\n

\"Mobile<\/p>\n

\n \"Mobile<\/p>\n

On a mobile crane, “luffing” is the motion of raising or lowering the boom \u2014 changing the angle between the boom and the horizontal plane. A boom angled steeply upward (70\u201380\u00b0) places the hook almost directly above the crane, giving maximum height but minimum reach. A boom angled lower (20\u201330\u00b0) extends the hook far from the crane, giving maximum reach but reduced height and load capacity.<\/p>\n<\/div>\n

The luffing cylinder is the single actuator that controls this angle. It connects the crane’s superstructure to the boom base, pushing the boom upward when it extends and lowering the boom when it retracts. Every entry on the crane’s load chart \u2014 the table that tells the operator the maximum safe load at each radius \u2014 is determined by the luffing cylinder’s ability to hold the boom at the required angle under the rated load.<\/p>\n

Korea Ever-Power manufactures luffing cylinders as the flagship product of the mobile machinery hydraulic cylinder<\/a> range \u2014 covering boom luffing for truck cranes, all-terrain cranes, rough-terrain cranes, and crawler cranes from 25-tonne to 1,200-tonne lifting capacity.<\/p>\n

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Technical Specifications<\/span><\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nMobile Crane Luffing Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nUp-and-down pitching rotation of the boom \u2014 main driving force for lifting<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n100 mm \u2013 560 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n50 mm \u2013 480 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 5,000 mm<\/td>\n<\/tr>\n
Working Pressure<\/td>\nMaximum 36 MPa<\/td>\n<\/tr>\n
Application<\/td>\nMobile Crane (truck crane, all-terrain, rough-terrain, crawler)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested \u00b7 load-holding verified<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

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Why the Luffing Cylinder Is the Most Safety-Critical Component on the Crane<\/h2>\n

Every other crane cylinder has a mechanical backup or a fail-safe condition. The outrigger cylinders (#19) rest on the ground \u2014 if hydraulic pressure fails, the outrigger stays down. The telescopic cylinder (#18) is enclosed inside the boom \u2014 if it leaks, the boom stays at its current length. But the luffing cylinder holds the boom against gravity. If it loses pressure, the boom drops.<\/p>\n

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\n Counterbalance valve \u2014 mechanical lock<\/strong><\/p>\n

Every luffing cylinder includes a pilot-operated counterbalance valve (also called a holding valve or load-holding valve) mounted directly on the cylinder port \u2014 not on a remote valve block connected by hoses. This valve mechanically locks the oil in the cylinder. Even if the supply hose ruptures, the counterbalance valve holds the boom in position. The boom cannot drop unless the operator deliberately commands it.<\/p>\n<\/p><\/div>\n

\n Barrel and rod \u2014 fatigue life rated<\/strong><\/p>\n

The luffing cylinder barrel sees millions of pressure cycles over its service life \u2014 each lift cycle applies and releases the full working pressure. The barrel wall thickness, weld quality, and material grade are specified for fatigue life exceeding the crane’s design life (typically 20\u201325 years or 10,000+ operating hours). Korea Ever-Power uses seamless precision-honed steel tube with full-penetration circumferential welds, ultrasonically inspected.<\/p>\n<\/p><\/div>\n

\n Rod buckling \u2014 verified at full extension<\/strong><\/p>\n

At 5,000 mm stroke with a 480 mm rod, the extended rod acts as a compression column under the full boom load. Euler buckling analysis is mandatory \u2014 the rod diameter, material strength, and mounting geometry must ensure a buckling safety factor of \u22653 at the worst-case boom angle. Korea Ever-Power performs FEA (finite element analysis) for every luffing cylinder design to verify rod stability under combined axial and lateral loading.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Mobile<\/p>\n

Boom Angle and the Load Chart \u2014 The Geometry That Governs Everything<\/span><\/h2>\n

A crane’s load chart shows the maximum load at each working radius (the horizontal distance from the crane’s centre of rotation to the hook). The working radius depends directly on the boom angle: a longer boom at a lower angle = greater radius = lower permitted load. The luffing cylinder sets the boom angle, so the luffing cylinder indirectly controls the crane’s load capacity at every lift.<\/p>\n

The force the luffing cylinder must produce changes dramatically with boom angle. When the boom is nearly vertical (75\u201385\u00b0), gravity acts almost in line with the boom \u2014 the luffing cylinder carries relatively little load. As the boom lowers toward horizontal, the gravitational moment arm increases \u2014 and the cylinder force required to hold the boom increases sharply. At a typical working angle of 30\u00b0, the cylinder force can be 3\u20135 times higher than at 75\u00b0.<\/p>\n

This is why the mobile crane luffing cylinder has the largest bore in the mobile machinery hydraulic cylinder family<\/a> \u2014 up to 560 mm \u2014 combined with the highest working pressure (36 MPa). The bore area \u00d7 pressure must produce enough force to hold the boom plus the rated load at the lowest working angle in the crane’s load chart.<\/p>\n<\/section>\n

<\/p>\n

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Seven Cylinders, One Crane \u2014 The Complete Mobile Crane Hydraulic System<\/span><\/h2>\n

The luffing cylinder is the first of seven hydraulic cylinder types that Korea Ever-Power manufactures for mobile cranes. Each cylinder serves a different function on the crane:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Cylinder<\/th>\nBore<\/th>\nStroke<\/th>\nMPa<\/th>\nFunction<\/th>\n<\/tr>\n<\/thead>\n
Luffing<\/td>\n100\u2013560<\/td>\n\u22645,000<\/td>\n36<\/td>\nBoom angle control<\/td>\n<\/tr>\n
Telescopic<\/td>\n75\u2013360<\/td>\n\u226422,000<\/td>\n42<\/td>\nBoom extension<\/td>\n<\/tr>\n
Outrigger<\/td>\n70\u2013360<\/td>\n\u2264800<\/td>\n42<\/td>\nStabilizer legs<\/td>\n<\/tr>\n
Suspension<\/td>\n85\u2013180<\/td>\n\u2264300<\/td>\n35<\/td>\nChassis damping<\/td>\n<\/tr>\n
Outrigger Expansion<\/td>\n50\u201375<\/td>\n\u22642,500<\/td>\n35<\/td>\nHorizontal beam extension<\/td>\n<\/tr>\n
Counterweight<\/td>\n85\u2013320<\/td>\n\u22641,500<\/td>\n35<\/td>\nCounterweight positioning<\/td>\n<\/tr>\n
Steering<\/td>\n63\u2013200<\/td>\n\u22641,000<\/td>\n35<\/td>\nChassis steering<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Korea Ever-Power supplies all seven cylinder types for crane OEMs \u2014 engineered for the same crane’s hydraulic system, pressure rating, and service environment. Single-source supply ensures system compatibility across the entire machine.<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"

Mobile crane luffing cylinder \u2014 the hydraulic actuator that controls the boom’s elevation angle, making it the single most important cylinder on any mobile crane. Luffing determines reach, height, and load capacity at every working radius. Bore 100\u2013560 mm, rod 50\u2013480 mm, stroke \u22645,000 mm, maximum working pressure 36 MPa. The luffing cylinder carries the combined dead weight of the boom assembly plus the suspended load \u2014 and must hold that load at any angle without drift. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2572,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[854],"product_tag":[],"class_list":["post-2571","product","type-product","status-publish","has-post-thumbnail","product_cat-mobile-machinery-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product\/2571","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/comments?post=2571"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media\/2572"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media?parent=2571"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_brand?post=2571"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_cat?post=2571"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_tag?post=2571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}