{"id":2575,"date":"2026-07-01T06:03:16","date_gmt":"2026-07-01T06:03:16","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/mobile-crane-outrigger-cylinder\/"},"modified":"2026-07-01T06:03:30","modified_gmt":"2026-07-01T06:03:30","slug":"mobile-crane-outrigger-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/cs\/produkt\/mobile-crane-outrigger-cylinder\/","title":{"rendered":"Mobile Crane Outrigger Cylinder"},"content":{"rendered":"

<\/p>\n

<\/p>\n

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

Mobile Crane Outrigger Cylinder<\/h2>\n

Four legs. Four cylinders. The entire crane \u2014 50 tonnes of machine plus 100 tonnes of suspended load \u2014 stands on four outrigger pads pushed into the ground by four hydraulic cylinders. If one loses pressure, the crane tips. Short stroke, maximum force, zero tolerance for drift.<\/p>\n

\n
70\u2013360mm<\/span>Bore Range<\/span><\/div>\n
\u2264800mm<\/span>Stroke<\/span><\/div>\n
42 MPa<\/span>Pressure<\/span><\/div>\n
\u00d74<\/span>Per Crane<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

The Foundation of Every Lift \u2014 Why the Crane Leaves the Ground<\/span><\/h2>\n
\n \"Mobile<\/p>\n

A mobile crane cannot lift from its wheels. Tyres are compliant \u2014 they compress, deform, and shift under load. If the crane lifted while resting on tyres, the suspension would compress unevenly as the boom swings, tilting the crane and making precise load placement impossible. Worse, the overturning moment from a load at the boom tip would roll the crane onto two wheels \u2014 then onto its side.<\/p>\n<\/div>\n

The outrigger cylinders solve this by creating a rigid, wide-footprint support base. The four cylinders extend downward, pressing steel pads firmly into the ground. As the pads take the weight, the crane’s wheels lift off the surface. The crane now stands on four solid points \u2014 spaced wider than the wheel track \u2014 providing a stable platform that resists the overturning moment from any boom angle and any load within the crane’s rated capacity.<\/p>\n

Korea Ever-Power manufactures outrigger cylinders as the stability foundation of the mobile machinery hydraulic cylinder<\/a> range. Each outrigger cylinder is paired with an outrigger expansion cylinder<\/a> (#21) that extends the beam horizontally before the outrigger cylinder pushes down.<\/p>\n<\/section>\n

<\/p>\n

\n

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 Outrigger Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nSupport the weight of the entire crane during lifting operations<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n70 mm \u2013 360 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n45 mm \u2013 320 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 800 mm<\/td>\n<\/tr>\n
Working Pressure<\/td>\nMaximum 42 MPa<\/td>\n<\/tr>\n
Application<\/td>\nMobile Crane (all types)<\/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

<\/p>\n

\n
\n

The Tipping Edge \u2014 Why Outrigger Failure Is the Number-One Crane Accident Cause<\/h2>\n

Crane tip-overs account for the majority of fatal crane accidents worldwide. The root cause in most cases is outrigger failure \u2014 not the outrigger cylinder itself, but the ground beneath the pad sinking under the concentrated load. However, the outrigger cylinder plays a critical role in preventing and detecting ground failure:<\/p>\n

\n
\n Load-holding valve \u2014 zero drift<\/strong><\/p>\n

Each outrigger cylinder has a pilot-operated check valve that locks the oil in the cylinder. Once the outrigger is set, the cylinder holds its position indefinitely \u2014 the pad does not creep downward even if the pump is shut off. This zero-drift performance is verified during factory testing: the cylinder is loaded to full rated force, the pump is disconnected, and the position is monitored for a defined hold period.<\/p>\n<\/p><\/div>\n

\n Level monitoring \u2014 detecting ground settlement<\/strong><\/p>\n

Modern cranes monitor the outrigger cylinder stroke position continuously. If one outrigger cylinder extends further than the others (indicating the ground beneath that pad is settling), the crane’s safety system alerts the operator and may restrict the load chart. The outrigger cylinder’s stroke sensor provides this critical feedback \u2014 making the cylinder a sensor as well as an actuator.<\/p>\n<\/p><\/div>\n

\n Overturning moment \u2014 the reaction force path<\/strong><\/p>\n

When the crane lifts a load at the boom tip, the overturning moment tries to tip the crane toward the load. The two outrigger cylinders on the load side resist this moment \u2014 their compressive force pushes down on the pads, and the ground pushes back up. The cylinder must sustain this compressive load without yielding, buckling, or leaking. Contact the Korea Ever-Power engineering team<\/a> for outrigger cylinder force calculations.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n \"Outrigger<\/p>\n

Short Stroke, Maximum Force \u2014 Why 800 mm Is Enough<\/span><\/h2>\n

The luffing cylinder (#17) needs 5,000 mm of stroke to swing the boom through its full angle range. The telescopic cylinder (#18) needs 22,000 mm to extend the boom sections. The outrigger cylinder needs only 800 mm \u2014 just enough to push the pad from its stowed position (tucked under the crane chassis) to the ground surface and slightly beyond (to lift the crane’s wheels clear of the ground).<\/p>\n

The travel distance from the stowed pad to the ground is 300\u2013700 mm on most cranes. The remaining 100\u2013500 mm of stroke provides adjustment for uneven ground \u2014 one outrigger may need to extend further than the others to level the crane on a sloped surface. The 800 mm maximum stroke accommodates the steepest ground slope that a crane can safely set up on (typically 1\u20133\u00b0 from level, depending on crane model).<\/p>\n<\/section>\n

<\/p>\n

\n

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

The outrigger cylinder barrel is thick-walled \u2014 designed for the full 42 MPa working pressure plus a safety factor for dynamic loads (the crane chassis experiences shock loading from wind gusts and sudden load releases). The bore is honed to Ra 0.2\u20130.4 \u00b5m. The rod end pad-mount is forged or welded with full-penetration welds \u2014 ultrasonically inspected, because the rod end carries the entire ground reaction force.<\/p>\n<\/div>\n

Chrome plating is 50\u201380 \u00b5m (outdoor service with direct ground contact splash). Seals are polyurethane with NBR wipers rated for -30 \u00b0C to +80 \u00b0C. Every outrigger cylinder is hydrostatic tested at 1.5\u00d7 rated pressure (63 MPa) and load-holding tested \u2014 verifying zero measurable drift under full rated load for a defined hold period.<\/p>\n

Outrigger cylinders are ordered in sets of 4 \u2014 Korea Ever-Power manufactures all 4 from the same bore batch to ensure matched force output across all four corners of the crane.<\/p>\n<\/section>\n

<\/p>\n

\n

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

Crane model and maximum lifting capacity, outrigger span (distance between pads), maximum ground reaction per outrigger, stroke, bore\/rod (or Korea Ever-Power calculates from force requirement), mounting geometry, load-holding valve specification, stroke sensor provision, and the outrigger beam assembly drawing.<\/p>\n<\/div><\/div>\n

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

Matched set of 4 cylinders with engineering drawing, load-holding valve port provisions, stroke sensor mounting, seal specification, chrome plating detail, and mounting dimensions. Hydrostatic + load-holding test certificate. Seal kits. Browse the industrial engineering cylinders<\/a> and the complete Korea Ever-Power catalogue<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n

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

<\/p>\n

\n

FAQ<\/span><\/h2>\n
\n
\n

How does the outrigger cylinder work with the outrigger expansion cylinder?<\/h3>\n

The outrigger expansion cylinder (#21) first extends the outrigger beam horizontally \u2014 sliding it outward from the crane chassis to maximise the support footprint. Then the outrigger cylinder (#19) extends vertically downward from the end of that beam, pushing the pad to the ground. The expansion cylinder provides width; the outrigger cylinder provides force. Both must be deployed before the crane can lift.<\/p>\n<\/p><\/div>\n

\n

What force does each outrigger cylinder carry?<\/h3>\n

It depends on the boom position and load. When the boom points directly over one outrigger, that outrigger carries the majority of the overturning moment \u2014 potentially 60\u201380% of the crane’s total weight plus the load. At 42 MPa with a 360 mm bore, the outrigger cylinder can produce over 4,000 KN of force \u2014 enough for cranes up to 500 tonnes lifting capacity.<\/p>\n<\/p><\/div>\n

\n

Can the crane operate with outriggers partially extended?<\/h3>\n

Yes \u2014 but at reduced capacity. The crane’s load chart has separate columns for fully extended, partially extended, and retracted outrigger positions. Partial extension reduces the support footprint, which reduces the crane’s resistance to overturning \u2014 so the permitted load decreases. The outrigger cylinder’s stroke sensor reports the actual extension to the crane’s safety system, which automatically selects the correct load chart column. Browse telescopic cylinders<\/a> and forklift cylinders<\/a> for other stabilisation applications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

\n

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
\"Aerial<\/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":"

Mobile crane outrigger cylinder \u2014 the vertical hydraulic leg that pushes the outrigger pad firmly into the ground, lifting the crane’s wheels off the surface and transferring the entire machine weight plus the suspended load onto four ground-contact points. Short stroke (\u2264800 mm) but massive force \u2014 bore up to 360 mm at 42 MPa. The outrigger cylinder is the foundation of every crane lift: if one outrigger loses pressure, settles, or sinks, the crane tips over. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2576,"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-2575","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\/cs\/wp-json\/wp\/v2\/product\/2575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/comments?post=2575"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/media\/2576"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/media?parent=2575"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product_brand?post=2575"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product_cat?post=2575"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product_tag?post=2575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}