{"id":2585,"date":"2026-07-01T06:03:33","date_gmt":"2026-07-01T06:03:33","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/rotary-drilling-luffing-cylinder\/"},"modified":"2026-07-01T06:03:36","modified_gmt":"2026-07-01T06:03:36","slug":"rotary-drilling-luffing-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/es\/product\/rotary-drilling-luffing-cylinder\/","title":{"rendered":"Rotary Drilling Luffing Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n \"Rotary<\/p>\n
\n Rotary Drilling Rig<\/span><\/p>\n

Rotary Drilling Luffing Cylinder<\/h2>\n

A new machine category \u2014 foundation piling rigs. The luffing cylinder tilts the drilling mast from flat (transport) to vertical (drilling) and holds it at \u00b10.3\u00b0 of true vertical during the entire drilling operation. A pile bored 0.5\u00b0 off-vertical at 30 metres depth arrives 260 mm away from its target position \u2014 enough to miss a column footing entirely.<\/p>\n

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125\u2013250mm<\/span>Bore<\/span><\/div>\n
\u22641,640mm<\/span>Stroke<\/span><\/div>\n
32 MPa<\/span>Pressure<\/span><\/div>\n
\u00b10.3\u00b0<\/span>Verticality<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

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From Cranes to Drilling Rigs \u2014 A Different Kind of Luffing<\/span><\/h2>\n

\"Rotary<\/p>\n

\n \"Rotary<\/p>\n

The mobile crane luffing cylinder (#17) changes the boom angle during every lift \u2014 continuously adjusting between 20\u00b0 and 85\u00b0 throughout the working day. The rotary drilling luffing cylinder does something fundamentally different: it sets the mast to vertical once at the start of the job, holds it there for hours or days of continuous drilling, then folds it flat for transport. The crane luffing cylinder is a dynamic actuator; the drilling luffing cylinder is a precision positioner.<\/p>\n<\/div>\n

The key engineering difference is the verticality requirement. A crane boom at 45.5\u00b0 instead of 45.0\u00b0 changes the working radius by a few centimetres \u2014 acceptable for most lifts. A drilling mast at 89.7\u00b0 instead of 90.0\u00b0 puts the borehole 260 mm off-target at 50 metres depth \u2014 unacceptable for a foundation pile that must land within 75 mm of the design position.<\/p>\n

Korea Ever-Power manufactures the rotary drilling luffing cylinder as the first of three rotary drilling rig cylinders<\/a> in the mobile machinery hydraulic cylinder range \u2014 alongside the mast cylinder (#25) and the pressurized cylinder (#26).<\/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>\nRotary Drilling Luffing Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nControl the mast luffing angle \u2014 adjust distance between mast and chassis<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n125 mm \u2013 250 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n90 mm \u2013 160 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 1,640 mm<\/td>\n<\/tr>\n
Working Pressure<\/td>\nUp to 32 MPa<\/td>\n<\/tr>\n
Application<\/td>\nRotary Drilling Rig (foundation piling)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested \u00b7 verticality-hold verified<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

<\/p>\n

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\u00b10.3\u00b0 \u2014 The Verticality Tolerance That Every Foundation Depends On<\/h2>\n

A bored pile is drilled vertically into the earth to carry the weight of a building column, bridge pier, or retaining wall. The pile’s design position is specified to within 75 mm of the column centreline. At 30 metres drilling depth, a verticality error of just 0.15\u00b0 displaces the pile toe by 75 mm \u2014 the entire tolerance budget. The luffing cylinder must hold the mast to within \u00b10.3\u00b0 of true vertical during the entire drilling operation.<\/p>\n

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\n During drilling \u2014 resisting torque reaction<\/strong><\/p>\n

The rotary table at the top of the mast applies 200\u2013500 KNm of torque to the drilling tool. The reaction to this torque tries to twist the mast sideways \u2014 the luffing cylinder resists this twisting force, holding the mast vertical against the drilling torque. Larger-diameter piles (1.5\u20133.0 m) require more torque, which increases the side-loading on the luffing cylinder.<\/p>\n<\/p><\/div>\n

\n During kelly bar extraction \u2014 resisting vertical load<\/strong><\/p>\n

When the drill tool is pulled out of the borehole (to empty the soil from the bucket), the mast carries the full weight of the kelly bar and the soil-laden drilling bucket \u2014 potentially 10\u201330 tonnes at the top of a 25-metre mast. The luffing cylinder must hold the mast angle against this vertical load without deflection. Contact the Korea Ever-Power engineering team<\/a> for rotary drilling cylinder specifications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Rotary<\/p>\n

Two Extremes \u2014 Vertical for Drilling, Flat for Transport<\/span><\/h2>\n

The drilling mast stands 20\u201330 metres tall when vertical \u2014 far too high for road transport (legal height limit is 4.0\u20134.5 metres). The luffing cylinder must fold the mast from vertical (90\u00b0) to near-horizontal (5\u201310\u00b0) for transport, then erect it to vertical at the next job site. The 1,640 mm stroke converts to approximately 80\u00b0 of mast rotation through the mast’s pivot linkage.<\/p>\n

Erecting the mast is the highest-force operation for the luffing cylinder \u2014 the mast’s centre of gravity is furthest from the pivot when the mast is horizontal, producing maximum gravitational torque. As the mast approaches vertical, the torque decreases rapidly. The cylinder must deliver maximum force at the start of the erection stroke and controlled precision at the end \u2014 transitioning from a power actuator to a precision positioner within the same stroke.<\/p>\n<\/section>\n

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Manufacturing Process<\/span><\/h2>\n
\n \"Korea<\/p>\n

The bore (125\u2013250 mm) is honed to Ra 0.2\u20130.4 \u00b5m. Chrome plating is 50\u201380 \u00b5m (outdoor construction site service). The rod eye bearing is a heavy-duty spherical joint \u2014 accommodating the angular misalignment between the cylinder and the mast pivot as the mast rotates through 80\u00b0 of travel. A standard clevis pin would bind at extreme angles; the spherical joint maintains free rotation throughout the full mast erection arc.<\/p>\n<\/div>\n

Load-holding is provided by a counterbalance valve on the rod port \u2014 preventing the mast from collapsing if a supply hose fails. The counterbalance valve’s crack pressure is set to hold the mast at any angle between 10\u00b0 and 90\u00b0 with a safety factor of \u22651.5. Every rotary drilling luffing cylinder is hydrostatic tested at 1.5\u00d7 working pressure (48 MPa) and verticality-hold tested \u2014 the cylinder is loaded to simulate the mast weight at vertical position, the pump disconnected, and the position monitored for zero drift over a defined period.<\/p>\n<\/section>\n

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OEM & ODM<\/span><\/h2>\n
\n
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What You Provide<\/strong><\/div>\n
\n

Drilling rig model and mast height, mast weight and centre-of-gravity position, maximum drilling torque (for side-load calculation), mast pivot geometry, required verticality tolerance, erection speed, transport fold angle, system pressure, counterbalance valve specification, and the mast pivot assembly drawing.<\/p>\n<\/div><\/div>\n

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What the Factory Delivers<\/strong><\/div>\n
\n

Engineering drawing with bore, rod, stroke, spherical rod eye, counterbalance valve provisions, seal specification, chrome plating detail, and mounting dimensions. Hydrostatic + verticality-hold test certificate. Seal kits. Browse the mobile machinery hydraulic cylinder family<\/a> and the Korea Ever-Power catalogue<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n

\"Korea
\n<\/section>\n

<\/p>\n

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FAQ<\/span><\/h2>\n
\n
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How does this differ from the mobile crane luffing cylinder (#17)?<\/h3>\n

The crane luffing cylinder dynamically adjusts the boom angle during every lift (continuous movement, high cycle count). The drilling luffing cylinder sets the mast angle once and holds it stationary for hours of drilling (precision positioning, low cycle count but extreme positional accuracy). The crane cylinder’s critical specification is dynamic force; the drilling cylinder’s critical specification is static verticality \u2014 two different engineering priorities from the same luffing concept.<\/p>\n<\/p><\/div>\n

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Can the mast be tilted deliberately for inclined piles?<\/h3>\n

Yes \u2014 some foundation designs require raked (inclined) piles at 5\u201315\u00b0 from vertical. The luffing cylinder can position the mast at any angle within its range, and the counterbalance valve holds that angle during drilling. The inclinometer on the mast provides real-time angle feedback to the operator, and the luffing cylinder makes micro-adjustments to maintain the specified rake angle during the drilling process.<\/p>\n<\/p><\/div>\n

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What other cylinders does a rotary drilling rig use?<\/h3>\n

In addition to the luffing cylinder, a rotary drilling rig uses a mast cylinder (#25 \u2014 for positioning the rotary table along the mast height) and a pressurized cylinder (#26 \u2014 for applying downward drilling force through the kelly bar). All three are available from Korea Ever-Power as a coordinated set. Browse telescopic cylinders<\/a> and industrial engineering cylinders<\/a> for related applications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

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Related Categories<\/span><\/h2>\n
\n <\/p>\n
\n
\"Telescopic\"<\/div>\n
\n
Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, hoist.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"Forklift\"<\/div>\n
\n
Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 OEM.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

\n
\"AWV\"<\/div>\n
\n
Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, platforms.<\/div>\n<\/div>\n<\/div>\n

<\/a>\n <\/div>\n<\/section>\n

<\/p>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Rotary drilling luffing cylinder \u2014 the hydraulic actuator that controls the mast angle on rotary drilling rigs used for foundation piling, diaphragm wall construction, and ground improvement. The mast must be set perfectly vertical (\u00b10.3\u00b0) for accurate borehole drilling \u2014 and then folded flat for road transport. The luffing cylinder adjusts the distance between the mast top and the chassis, tilting the mast from its working vertical position to its transport horizontal position and back. Bore 125\u2013250 mm, stroke \u22641,640 mm, 32 MPa. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2586,"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-2585","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\/2585","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=2585"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media\/2586"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/media?parent=2585"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_brand?post=2585"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_cat?post=2585"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/es\/wp-json\/wp\/v2\/product_tag?post=2585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}