{"id":1819,"date":"2026-09-09T06:35:26","date_gmt":"2026-09-09T06:35:26","guid":{"rendered":"https:\/\/metalite.net\/?post_type=product&p=1819"},"modified":"2026-09-09T06:54:48","modified_gmt":"2026-09-09T06:54:48","slug":"hcyy11112018-crawler-crane-boom-hoist-hydraulic-cylinder","status":"publish","type":"product","link":"https:\/\/metalite.net\/ta\/product\/hcyy11112018-crawler-crane-boom-hoist-hydraulic-cylinder\/","title":{"rendered":"Crawler Crane Boom Hoist Hydraulic Cylinder \u2013 Model HCYY11112018 | \u03a6280\u00d7\u03a6160\u00d72200, 31.5 MPa"},"content":{"rendered":"

<\/p>\n

<\/p>\n

\n

<\/p>\n

\n
<\/div>\n

Model HCYY11112018<\/p>\n

Crawler Crane Boom Hoist Hydraulic Cylinder<\/h2>\n

\u03a6280 \u00d7 \u03a6160 \u00d7 2200 mm \u00b7 31.5 MPa working pressure \u00b7 1,003 kg \u2014 The primary luffing actuator that raises and lowers the boom on heavy crawler cranes.<\/p>\n

\u03a6280 mm Bore<\/span>
\n2200 mm Stroke<\/span>
\n31.5 MPa \/ 40 MPa<\/span>
\n1,003 kg<\/span><\/div>\n<\/div>\n
\n
<\/div>\n
\"HCYY11112018<\/div>\n<\/div>\n

<\/p>\n

What the Crawler Crane Boom Hoist Cylinder Does \u2014 and Why It’s the Hardest-Working Cylinder on the Machine<\/h2>\n

On a crawler crane, the boom hoist hydraulic cylinder<\/strong> has the most unforgiving job description in the entire hydraulic system: raise and lower the boom under full rated load, hold position without drift under sustained load, and do it repeatedly across years of heavy construction, infrastructure, and lifting operations. The HCYY11112018 is built specifically for this role \u2014 a \u03a6280 mm bore, 2200 mm stroke cylinder rated at 31.5 MPa and weighing just over a metric tonne.<\/p>\n

The boom hoist function \u2014 sometimes called luffing \u2014 controls the angle of the boom relative to the crane’s upper structure. Every degree of change in boom angle shifts the effective load radius and alters the overturning moment on the crane. The crane luffing cylinder<\/strong> is therefore not just a lifting actuator; it’s a precision positioning device that determines safe working radius on every lift. Small errors in boom angle translate directly into load chart violations and structural overload risk.<\/p>\n

At 40 MPa maximum withstand pressure \u2014 27% above rated working pressure \u2014 and a 3000 mm installation distance, the HCYY11112018 is specified for crawler cranes in the 100\u2013500 tonne capacity class where the loads being managed, and the consequences of cylinder failure, are both in a category of their own.<\/p>\n

<\/p>\n

\n

Crawler Crane Hydraulic Cylinder Installation Positions<\/p>\n

\"Installation<\/p>\n

The boom hoist cylinder connects the upper structure to the boom foot \u2014 extending to raise the boom angle, retracting to lower it under controlled load.<\/p>\n<\/div>\n

<\/p>\n

Technical Specifications \u2014 HCYY11112018 Boom Hoist Hydraulic Cylinder<\/h2>\n

\"HCYY11112018<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\nEngineering Context<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nHCYY11112018<\/td>\nCrawler crane boom hoist series<\/td>\n<\/tr>\n
Bore \u00d7 Rod \u00d7 Stroke<\/td>\n\u03a6280 \u00d7 \u03a6160 \u00d7 2200 mm<\/td>\nLarge-bore long-stroke for maximum luffing torque<\/td>\n<\/tr>\n
Working Pressure<\/td>\n31.5 MPa<\/td>\nPush force \u2248 1,939 kN at rated pressure<\/td>\n<\/tr>\n
Max Withstand Pressure<\/td>\n40 MPa<\/td>\n27% overpressure margin; each unit hydrostatically tested<\/td>\n<\/tr>\n
Stroke (Trip)<\/td>\n2200 mm<\/td>\nControls full angular range of boom luffing travel<\/td>\n<\/tr>\n
Installation Distance<\/td>\n3000 mm<\/td>\nPin-to-pin (retracted); critical for boom geometry<\/td>\n<\/tr>\n
Weight<\/td>\n1,003 kg<\/td>\nHeaviest cylinder in the crawler crane hydraulic system<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

\n
\n

1,939 kN<\/p>\n

Push force at 31.5 MPa<\/p>\n<\/div>\n

\n

\u03a6280 mm<\/p>\n

Bore diameter<\/p>\n<\/div>\n

\n

40 MPa<\/p>\n

Max withstand pressure<\/p>\n<\/div>\n

\n

27%<\/p>\n

Overpressure safety margin<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Why a \u03a6280 Bore and 40 MPa Burst Rating Matter on a Heavy Crawler Crane<\/h2>\n

A \u03a6280 mm bore at 31.5 MPa produces a calculated push force of approximately 1,939 kN<\/strong> \u2014 close to 200 tonnes of linear force. That force, acting through the boom pivot arm, creates the torque needed to raise and hold the boom against the combined weight of the boom structure, rigging, and suspended load. On large crawler cranes, the boom assembly alone can weigh 30\u201380 tonnes before any load is attached; the hoist cylinder must overcome that dead weight on every single raise cycle.<\/p>\n

The \u03a6160 mm rod \u2014 a 4:2.3 bore-to-rod ratio \u2014 is sized to handle the compressive buckling load across a 2200 mm stroke under eccentric loading conditions. During boom lowering, the cylinder transitions from a tension-loaded (extending against boom weight) to a compression-loaded state as the boom weight reverses through the pivot geometry. This reversal creates a column buckling risk on the rod that undersized designs fail to account for. The \u03a6160 rod on the HCYY11112018 is calculated to maintain a minimum Euler buckling safety factor of 3.5 across the full stroke range.<\/p>\n

The 40 MPa maximum withstand pressure \u2014 27% above the 31.5 MPa working rating \u2014 is not arbitrary. Crawler crane hydraulic systems regularly experience pressure spikes during boom raise initiation (load break-out force), sudden load swings that shift center of gravity, and emergency stop events. The 8.5 MPa margin between working and withstand pressure absorbs these transients without seal extrusion or bore distortion.<\/p>\n

The 3000 mm installation distance is the geometric foundation of the boom luffing system. It determines the mechanical advantage at every boom angle \u2014 change it, and you change the load chart. This is why replacement cylinders must match the OEM installation distance exactly; a few millimetres of variation ripples into measurable changes in rated lift capacity at working radius.<\/p>\n

\"HCYY11112018<\/p>\n

<\/p>\n

Where the Crawler Crane Boom Hoist Cylinder Is Deployed<\/h2>\n

The HCYY11112018 is specified for the boom hoist position on lattice-boom crawler cranes operating across the following sectors:<\/p>\n

    \n
  • Heavy civil and infrastructure construction<\/strong> \u2014 bridge beam installation, dam construction, and large-span structure lifts where boom angle control determines safe working radius on every pick<\/li>\n
  • Oil, gas, and petrochemical plant construction<\/strong> \u2014 module lifts and vessel installations where sustained load holding at precise boom angles is required for extended periods<\/li>\n
  • Offshore and marine heavy lift<\/strong> \u2014 port equipment installation, jacket setting, and subsea module handling where sea-state induced dynamic loading adds to the static load<\/li>\n
  • Wind energy installation<\/strong> \u2014 nacelle and blade lifts where the boom must hold a fixed angle for extended periods while rigging crews position the load<\/li>\n
  • Nuclear and power plant maintenance<\/strong> \u2014 controlled heavy lifts in confined or sensitive environments where reliable load-holding without drift is a safety requirement, not a preference<\/li>\n<\/ul>\n

    <\/p>\n

    Construction and Material Specification \u2014 Built for the Loads That Don’t Forgive Shortcuts<\/h2>\n
    \n
    \n

    Cylinder Barrel<\/p>\n

    Seamless forged steel tube (ST52 \/ 27SiMn), precision-honed bore Ra \u2264 0.4 \u03bcm. Wall thickness verified by finite element analysis for 40 MPa burst with minimum safety factor of 2.5 on yield.<\/p>\n<\/div>\n

    \n

    Piston Rod<\/p>\n

    \u03a6160 mm, 42CrMo4 alloy steel, induction-hardened and hard-chrome plated \u2265 30 \u03bcm. Slenderness ratio engineered against Euler column buckling at full 2200 mm extension under eccentric loading.<\/p>\n<\/div>\n

    \n

    Seal Package<\/p>\n

    Hallite or equivalent PU\/PTFE composite piston seal with bronze-filled backup rings. Rod seal with double-lip wiper and anti-extrusion ring. Rated \u221230 \u00b0C to +90 \u00b0C, compatible with HM\/HV mineral hydraulic oil.<\/p>\n<\/div>\n

    \n

    End Mounts<\/p>\n

    Heavy-duty forged-steel clevis and pin-eye ends, machined from 42CrMo4. Pin bore tolerance H7, spherical bearing option available for misalignment up to \u00b13\u00b0 in service.<\/p>\n<\/div>\n

    \n

    Load-Holding Valve<\/p>\n

    Integral counterbalance valve (pilot-operated check) mounted directly on the cylinder port block. Prevents boom drop on hydraulic line failure \u2014 a mandatory safety feature on all crane luffing circuits.<\/p>\n<\/div>\n

    \n

    Factory Testing<\/p>\n

    Full stroke cycle test (5 cycles, no-load and loaded), hydrostatic hold at 40 MPa for 10 minutes, zero-leakage verification at 31.5 MPa. Individual test certificate issued per cylinder.<\/p>\n<\/div>\n<\/div>\n

    <\/p>\n

    Installation and Replacement \u2014 What You Need to Know Before the Crane Goes Down<\/h2>\n

    A 1,003 kg cylinder replacement on a crawler crane is a planned maintenance event, not a field improvisation. Key considerations:<\/p>\n