{"id":2577,"date":"2026-07-01T06:03:16","date_gmt":"2026-07-01T06:03:16","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/mobile-crane-suspension-cylinder\/"},"modified":"2026-07-01T06:03:30","modified_gmt":"2026-07-01T06:03:30","slug":"mobile-crane-suspension-cylinder","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/da\/vare\/mobile-crane-suspension-cylinder\/","title":{"rendered":"Mobile Crane Suspension Cylinder"},"content":{"rendered":"

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

Mobile Crane Suspension Cylinder<\/h2>\n

Not an actuator. Not a lifter. The suspension cylinder is a spring and a damper in one sealed unit \u2014 absorbing every pothole, bridge joint, and road imperfection during the crane’s highway journey at 80 km\/h, then levelling the 50-tonne chassis on a sloped construction site.<\/p>\n

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85\u2013180mm<\/span>Bore Range<\/span><\/div>\n
\u2264300mm<\/span>Stroke<\/span><\/div>\n
35 MPa<\/span>Pressure<\/span><\/div>\n
N\u2082 Gas<\/span>Accumulator<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

<\/p>\n

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Not a Pusher, Not a Lifter \u2014 A Spring That Thinks<\/span><\/h2>\n
\n \"Mobile<\/p>\n

Every other cylinder in the mobile machinery hydraulic cylinder<\/a> family is an actuator \u2014 it receives a command, extends or retracts, and produces force in one direction. The suspension cylinder is fundamentally different. It is a passive energy absorber: when the axle hits a bump, the cylinder compresses, the oil flows through a restricted orifice into a nitrogen-gas accumulator, and the bump energy is converted into heat in the oil. When the bump passes, the nitrogen gas pushes the oil back, extending the cylinder and restoring the chassis height.<\/p>\n<\/div>\n

This makes the suspension cylinder a combined spring (the gas provides the restoring force) and damper (the orifice controls the compression and rebound speed). The spring rate, damping coefficient, and ride height are all determined by the cylinder’s bore, rod diameter, orifice size, and the gas pre-charge pressure in the accumulator \u2014 parameters that Korea Ever-Power tunes for each crane model’s axle load and target ride quality.<\/p>\n<\/section>\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 Suspension Cylinder<\/td>\n<\/tr>\n
Function<\/td>\nHydropneumatic damping system for crane chassis<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n85 mm \u2013 180 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n50 mm \u2013 100 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 300 mm (shortest in family)<\/td>\n<\/tr>\n
Working Pressure<\/td>\nMaximum 35 MPa<\/td>\n<\/tr>\n
Application<\/td>\nMobile Crane Chassis (all axles)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% tested \u00b7 gas pre-charge certified<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

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Two Jobs, Two Speeds \u2014 Highway Comfort and Site Levelling<\/h2>\n
\n
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\n Job 1: Road travel \u2014 dynamic damping<\/strong><\/p>\n

During highway travel at 60\u201385 km\/h, the suspension cylinder cycles continuously \u2014 compressing and rebounding 10\u201350 times per second as the axle follows the road surface. The nitrogen accumulator provides a progressive spring rate: soft at small amplitudes (for ride comfort) and stiff at large amplitudes (to prevent bottoming out). The damping orifice controls the cycle speed \u2014 preventing oscillation (bouncing) after each bump. A crane with 5\u20139 axles has 10\u201318 suspension cylinders cycling simultaneously.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

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\n Job 2: Site setup \u2014 active levelling<\/strong><\/p>\n

At the job site, the suspension system switches from passive damping to active levelling. The crane controller adjusts the oil volume in each suspension cylinder independently \u2014 raising or lowering each axle point to level the chassis on sloped or uneven ground before the outriggers deploy. This levelling function uses the same cylinder but in a controlled, slow-speed mode \u2014 pumping oil in or out rather than absorbing road shocks. Contact the Korea Ever-Power engineering team<\/a> for suspension tuning data.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

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The Highest Cycle Count on the Crane \u2014 Millions per Year<\/span><\/h2>\n
\n \"Suspension<\/p>\n

The luffing cylinder (#17) cycles a few hundred times per day. The outrigger cylinder (#19) cycles a few times per day. The suspension cylinder cycles millions of times per year. At highway speed, each suspension cylinder completes 10\u201350 compression-rebound cycles per second \u2014 approximately 36,000\u2013180,000 cycles per hour of driving. A crane that travels 500 hours per year accumulates 18\u201390 million suspension cycles per year.<\/p>\n<\/div>\n

This extreme cycle count drives every design decision: the seals must have ultra-low friction (to prevent heat build-up from continuous cycling), the bore finish must be fine enough to maintain the oil film at high cycling frequency, and the gas seal in the accumulator must maintain the nitrogen charge for 12\u201324 months without recharging.<\/p>\n

Korea Ever-Power specifies PTFE-bronze guide rings and low-friction polyurethane seals for the suspension cylinder \u2014 the same ultra-low-friction seal technology used on the electric forklift cylinder, but adapted for the higher pressure and outdoor environment of the crane chassis.<\/p>\n<\/section>\n

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Manufacturing Process<\/span><\/h2>\n

The suspension cylinder bore is honed to Ra 0.1\u20130.2 \u00b5m \u2014 finer than the standard 0.2\u20130.4 \u00b5m used on actuator cylinders \u2014 because the continuous high-frequency cycling demands the lowest possible seal friction and the most stable oil film. Chrome plating is 50\u201380 \u00b5m (road splash, salt, stone chips). The damping orifice is precision-drilled and flow-calibrated \u2014 orifice diameter tolerance is \u00b10.05 mm, because a 0.1 mm variation changes the damping coefficient by 15\u201325%.<\/p>\n

The nitrogen accumulator is integrated into the cylinder assembly or mounted as a separate unit connected by a short hose. The gas pre-charge pressure is set at the factory and verified with a calibrated gauge \u2014 the pre-charge determines the ride height and the spring rate, and must match the crane manufacturer’s specification to within \u00b12 bar. Every suspension cylinder is hydrostatic tested, damping-rate tested (compression and rebound speed at specified piston velocity), and gas-charge certified before shipment.<\/p>\n<\/section>\n

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OEM & ODM<\/span><\/h2>\n
\n
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What You Provide<\/strong><\/div>\n
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Axle load per suspension point, target ride frequency, target damping ratio, stroke, maximum road speed, gas pre-charge pressure, accumulator volume, temperature range, active levelling requirement (if applicable), and the chassis suspension geometry drawing showing cylinder mounting points and axle kinematics.<\/p>\n<\/div><\/div>\n

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

Engineering drawing with bore, rod, stroke, damping orifice detail, accumulator specification, gas pre-charge certificate, low-friction seal specification, and mounting dimensions. Hydrostatic + damping-rate + gas-charge test certificate. Seal kits. Browse the mobile machinery hydraulic cylinder family<\/a> and the complete 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 the suspension cylinder differ from a conventional shock absorber?<\/h3>\n

A conventional automotive shock absorber is a damper only \u2014 it controls the speed of suspension travel but does not carry the vehicle weight. The crane suspension cylinder is a spring AND a damper \u2014 the nitrogen accumulator carries the axle load (acting as a gas spring) and the orifice provides damping. This combined function eliminates the need for a separate steel spring, saving space and weight on the crane chassis.<\/p>\n<\/p><\/div>\n

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How often does the nitrogen charge need refilling?<\/h3>\n

With a properly sealed accumulator, the nitrogen charge maintains specification for 12\u201324 months. Loss of gas charge causes the ride height to drop and the ride quality to deteriorate (the suspension becomes “dead” \u2014 no spring action). Crane maintenance schedules typically include gas charge verification every 6\u201312 months. Korea Ever-Power uses metal-to-metal accumulator seals rated for less than 1% gas loss per year.<\/p>\n<\/p><\/div>\n

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Is the suspension cylinder active during crane lifting?<\/h3>\n

No \u2014 during lifting, the crane rests on its outrigger cylinders (#19), and the suspension is unloaded (the wheels are off the ground). The suspension cylinder is active only during road travel and site manoeuvring. On some cranes, the suspension locks out (bypassing the damping orifice) during low-speed site manoeuvres to prevent chassis roll during boom swinging. Browse telescopic cylinders<\/a> and forklift cylinders<\/a> for other suspension-related applications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\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":"

Mobile crane suspension cylinder \u2014 the only cylinder in the mobile crane family that is not a conventional actuator. It is a hydropneumatic spring-damper: a hydraulic cylinder working against a nitrogen gas accumulator to absorb road shocks during highway travel and level the chassis on uneven ground at the job site. Bore 85\u2013180 mm, stroke \u2264300 mm, 35 MPa. The shortest stroke and the smallest bore range in the crane cylinder family \u2014 but it operates continuously during every kilometre of road travel. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2578,"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-2577","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\/da\/wp-json\/wp\/v2\/product\/2577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/comments?post=2577"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/media\/2578"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/media?parent=2577"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/product_brand?post=2577"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/product_cat?post=2577"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/da\/wp-json\/wp\/v2\/product_tag?post=2577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}