{"id":1895,"date":"2026-07-02T03:08:58","date_gmt":"2026-07-02T03:08:58","guid":{"rendered":"https:\/\/tiltcylinder.com\/?post_type=product&p=1895"},"modified":"2026-07-02T03:17:02","modified_gmt":"2026-07-02T03:17:02","slug":"ep-%cf%86140x%cf%86120x640-cylinder-for-frame-support","status":"publish","type":"product","link":"https:\/\/tiltcylinder.com\/hi\/product\/ep-%cf%86140x%cf%86120x640-cylinder-for-frame-support\/","title":{"rendered":"\u092b\u094d\u0930\u0947\u092e \u0938\u092a\u094b\u0930\u094d\u091f \u0915\u0947 \u0932\u093f\u090f EP-\u03a6140\u00d7\u03a6120\u00d7640 \u0938\u093f\u0932\u0947\u0902\u0921\u0930"},"content":{"rendered":"
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Truck Crane Hydraulic System | Frame Stabilisation | high-pressure frame support cylinder<\/p>\n

\u092b\u094d\u0930\u0947\u092e \u0938\u092a\u094b\u0930\u094d\u091f \u0915\u0947 \u0932\u093f\u090f EP-\u03a6140\u00d7\u03a6120\u00d7640 \u0938\u093f\u0932\u0947\u0902\u0921\u0930<\/h2>\n

A large-bore, high-pressure cylinder for frame support designed for the structural stabilisation circuits of truck-mounted cranes \u2014 holding the crane body rigid against tipping and deflection loads during lift operations on French construction sites and industrial project worksites throughout Europe.<\/p>\n

Truck Crane Hydraulic<\/a>
\nRequest a Quote<\/a><\/div>\n<\/div>\n<\/div>\n

1. Technical Specifications<\/h2>\n

Complete dimensional and performance parameters for the EP-\u03a6140\u00d7\u03a6120\u00d7640 cylinder for frame support as supplied for truck crane frame stabilisation applications.<\/p>\n

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Parameter<\/th>\nValue<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Cylinder Model<\/td>\nHCYY11112023<\/td>\nEP Series Frame Support<\/td>\n<\/tr>\n
Specifications (Bore \u00d7 Rod \u00d7 Stroke)<\/td>\n\u03a6140 \u00d7 \u03a6120 \u00d7 640 mm<\/td>\nDouble acting<\/td>\n<\/tr>\n
Working Pressure<\/td>\n30 MPa<\/td>\nContinuous rated<\/td>\n<\/tr>\n
Maximum Withstand Pressure<\/td>\n40 MPa<\/td>\nProof \/ test pressure<\/td>\n<\/tr>\n
Stroke (Trip)<\/td>\n640 mm<\/td>\nFull engagement travel<\/td>\n<\/tr>\n
Installation Distance<\/td>\n983 mm<\/td>\nPin-to-pin retracted<\/td>\n<\/tr>\n
Weight<\/td>\n123 kg<\/td>\nFully assembled<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n\u03a6140 mm<\/td>\nHoned to H7 tolerance<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n\u03a6120 mm<\/td>\nHard chrome plated<\/td>\n<\/tr>\n
Theoretical Extension Force<\/td>\n\u2248 461 kN<\/td>\nAt 30 MPa rated pressure<\/td>\n<\/tr>\n
Theoretical Retraction Force<\/td>\n\u2248 122 kN<\/td>\nAt 30 MPa on annular area<\/td>\n<\/tr>\n
Actuation Type<\/td>\n\u0926\u0941\u0917\u0928\u093e \u0905\u092d\u093f\u0928\u092f<\/td>\nPowered extend and retract<\/td>\n<\/tr>\n
Operating Temperature Range<\/td>\n\u221225 \u00b0C to +80 \u00b0C<\/td>\nMineral hydraulic oil<\/td>\n<\/tr>\n
Application<\/td>\nTruck Crane Frame Support<\/td>\nChassis locking circuit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\"tiltcylinder-product-EP-\u03a6140\u00d7\u03a6120\u00d7640<\/p>\n

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2. What Is a Cylinder for Frame Support?<\/h2>\n

A cylinder for frame support is a heavy-duty hydraulic actuator installed in the crane structural circuit of truck-mounted and mobile cranes, where its primary function is to resist the substantial reaction forces that arise at the crane body-to-chassis interface during lifting operations. When a truck crane elevates a heavy load, the overturning moment generated by that load is transmitted through the boom, slew ring, and into the crane body as a downward force on the loaded side and an upward peel force on the opposing side. The cylinder for frame support \u2014 positioned between the crane body and the vehicle chassis frame \u2014 pre-loads the crane body into the chassis structure, locking the two together hydraulically against both downward compression and upward separation, producing a rigid structural unit that eliminates the micro-movement that would otherwise develop at the body-frame interface under dynamic load.<\/p>\n

In French camion-grue (truck crane) terminology, this cylinder is part of the verrouillage de ch\u00e2ssis system \u2014 the chassis locking assembly that secures the crane superstructure to the carrier chassis before lifting begins. Without a correctly functioning cylinder for frame support, the crane’s rated capacity cannot be safely applied, because the elastic deformation of the unlocked body-chassis interface introduces boom tip travel that exceeds what the load calculation has allowed for and risks progressive overloading of the weakest joint in the structural chain. This is precisely why the cylinder for frame support is classified as a safety-critical component in crane hydraulic circuit design and is subject to the proof pressure and leakage rate requirements mandated in FEM 1.001 and EN 13852 for offshore crane variants and AFNOR-aligned national standards for land-based truck cranes in France.<\/p>\n

The EP-\u03a6140\u00d7\u03a6120\u00d7640 cylinder for frame support carries a bore diameter of \u03a6140 mm, a rod diameter of \u03a6120 mm, and a stroke of 640 mm, operating at a rated working pressure of 30 MPa. These dimensions reflect the high force levels demanded at the body-frame interface of mid-to-heavy capacity truck cranes in the 30 to 80 tonne lift class \u2014 the most common segment of the French crane hire and construction lifting market. The unit weighs 123 kg fully assembled and is designed to install within the 983 mm pin-to-pin installation distance standard in this crane capacity class. Selecting the correct cylinder for frame support for a given truck crane model requires matching the bore, stroke, pressure rating, and end fitting geometry to the crane structural design specifications.<\/p>\n<\/div>\n

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3. Five Key Advantages of the EP Cylinder for Frame Support<\/h2>\n

Engineering features that distinguish this cylinder for frame support in demanding truck crane and heavy lifting applications.<\/p>\n

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1. \u03a6140 mm Bore for Maximum Clamping Force<\/h3>\n

At 30 MPa working pressure across a \u03a6140 mm bore, this cylinder for frame support generates approximately 461 kN of extension force \u2014 the sustained clamping force required to lock the crane body rigidly to the vehicle frame under full rated lift load. The large bore ensures the frame clamping load remains well within the cylinder for frame support’s capacity even during the dynamic load variations that accompany crane swing and sudden load application events.<\/p>\n<\/div>\n

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2. 40 MPa Maximum Withstand Pressure<\/h3>\n

The 40 MPa proof pressure rating \u2014 33% above the 30 MPa working pressure \u2014 gives this cylinder for frame support a structural safety margin well above the EN and FEM standard requirements for safety-critical crane hydraulic components. Dynamic shock loads during abrupt crane deceleration or sudden load pick-up can produce pressure transients substantially above the steady-state working level, and this margin ensures the cylinder for frame support and its end fittings remain intact under these conditions.<\/p>\n<\/div>\n

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3. Low-Leakage Piston Sealing for Static Load Holding<\/h3>\n

The cylinder for frame support must hold the chassis clamping load for the entire duration of a lift sequence \u2014 potentially hours in a complex multi-pick rigging operation. Any internal piston leakage that produces pressure decay in the clamping circuit would gradually reduce the frame locking force, requiring the operator to monitor and re-apply pressure. The piston seal specification is designed to maintain the clamping pressure within operational limits across the full duration of a standard lift sequence without active circuit replenishment.<\/p>\n<\/div>\n

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4. Heavy-Duty Flange and End Cap Design<\/h3>\n

The cylinder for frame support is subject to both axial compressive force (holding the crane body down) and tensile force (resisting the peel-up load on the opposite side), placing the end cap thread engagement and the mounting flange in a combined stress state that requires more conservative end cap design than a simple single-direction actuator. The end cap thread length and flange bolt pattern are sized for this combined loading condition across the rated pressure and service life of the cylinder for frame support.<\/p>\n<\/div>\n

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5. Compact 640 mm Stroke in a 983 mm Installation Envelope<\/h3>\n

The 640 mm stroke provides the travel needed to both engage and disengage the frame clamping action from the crane’s stowed-travel position through full clamping engagement, while the 983 mm pin-to-pin installation distance fits within the structural envelope standard in the mid-range truck crane chassis designs prevalent in the French crane hire and heavy transport sectors. The 123 kg assembled weight is a practical field-handling figure for maintenance access on a chassis-mounted cylinder.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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4. Working Principle of the Cylinder for Frame Support<\/h2>\n

The cylinder for frame support operates as a large-bore double-acting actuator within the crane’s frame locking sub-circuit of the cylinder for frame support. Before lifting begins, the crane operator initiates the frame locking sequence from the control cab: hydraulic fluid under pressure is directed into the cap-end (extension) chamber of the cylinder for frame support, driving the piston rod outward against the crane body’s lower structural rail. As the rod extends, it applies a controlled compressive force that draws the crane body down against the vehicle chassis frame and simultaneously pre-loads the mounting flanges and locking brackets at the body-chassis interface. Once the cylinder for frame support reaches the prescribed locking pressure \u2014 confirmed by a pressure transducer in the circuit \u2014 the crane safety interlock permits lifting to proceed with the cylinder for frame support maintaining full engagement \u2014 typically confirmed by a pressure transducer in the circuit \u2014 the crane’s safety system permits lifting to proceed.<\/p>\n

Throughout the lift, the cylinder for frame support is held in the extended clamping position by the hydraulic circuit’s holding valve or load-locking check valve, which prevents oil from returning to tank regardless of pressure fluctuations in the main hydraulic supply. This load-holding function is safety-critical: the cylinder for frame support must not release its clamping force during a lift even if the main pump supply is momentarily interrupted or if the operator accidentally releases the locking control. The holding valve maintains the clamping pressure independently of the main circuit, ensuring the cylinder for frame support maintains engagement for the full duration of the lift sequence regardless of what happens elsewhere in the crane’s hydraulic system.<\/p>\n

When the lift is complete and the crane is ready to travel, the rod-end chamber is pressurised to retract the cylinder for frame support piston rod, releasing the frame clamping force and allowing the crane body freedom to flex during road travel \u2014 the travel condition where a rigidly locked frame would transfer road shock loads into the crane structure rather than allowing them to be absorbed by the chassis suspension. The cylinder for frame support actively manages the transition between the rigid-lock condition needed for lifting and the floating-free condition needed for road travel, and its correct function at each transition is verified as part of the pre-lift safety check procedure mandated by French crane operating standards.<\/p>\n<\/div>\n

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5. Materials and Construction<\/h2>\n

Material specification for a cylinder for frame support in truck crane service is driven by three concurrent requirements that are not easily reconciled using standard warehouse-class hydraulic cylinder materials: very high working and proof pressures, exposure to the outdoor environment of a crane worksite across a multi-year service life, and the safety-critical load-holding function that demands zero internal leakage under sustained pressure for the full duration of each lifting operation. The following material choices address all three requirements simultaneously.<\/p>\n

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Cylinder Barrel<\/h4>\n

High-strength seamless steel tube (27SiMn or equivalent), honed to Ra 0.4 \u00b5m internal finish. At 30 MPa working pressure and \u03a6140 mm bore, hoop stress at the barrel wall is considerably higher than in smaller-bore cylinders \u2014 the high-strength alloy grade provides the wall thickness efficiency needed to keep the installed cylinder weight at 123 kg while meeting the 40 MPa proof pressure requirement without permanent bore deformation.<\/p>\n<\/div>\n

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Piston Rod<\/h4>\n

40Cr or 45# alloy steel, induction-hardened to 52\u201358 HRC at the surface, with hard chrome plating to 25\u201330 \u00b5m and final ground to Ra 0.2 \u00b5m or better. The \u03a6120 mm rod is subjected to both axial load (clamping force) and bending (from any angular misalignment at the mounting pin during crane body flex), making high surface hardness and tight straightness tolerance critical for seal life in this application.<\/p>\n<\/div>\n

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End Caps and Flange Fittings<\/h4>\n

Forged 45# or 40Cr steel end caps with thread engagement calculated for the combined axial and pressure-induced load at 40 MPa proof. Full-seam welding at the barrel-to-cap transition, where applicable, is stress-relieved after welding to eliminate residual stress concentration. The mounting flange is machined from forged plate for grain continuity across the highly loaded bolt circle region.<\/p>\n<\/div>\n

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Sealing System<\/h4>\n

Polyurethane piston seals, PTFE-backed guide rings, polyurethane rod seals, and NBR wiper seals \u2014 all rated for \u221225 \u00b0C to +80 \u00b0C mineral oil service. The piston seal package for a cylinder for frame support must maintain sustained zero-bypass performance under static load for extended hold periods, which is a more demanding requirement than the dynamic seal performance typically specified for standard actuator cylinders.<\/p>\n<\/div>\n

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Surface Protection<\/h4>\n

Two-coat paint system \u2014 epoxy primer plus polyurethane topcoat \u2014 on all external steel surfaces including barrel, end caps, and flange mounting hardware, with salt-spray resistance exceeding 480 hours per ISO 9227. The outdoor construction site environment of French crane operations exposes the cylinder for frame support to rain, road dust, and site contamination conditions that demand corrosion protection beyond what indoor industrial equipment requires. A correctly specified cylinder for frame support for this environment carries a minimum 480-hour salt-spray rated exterior, and a wiper seal designed to exclude the abrasive grit and road contamination that accumulates around the rod during site operation.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"tiltcylinder-product-EP-\u03a6140\u00d7\u03a6120\u00d7640<\/p>\n

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6. Application Scenarios<\/h2>\n

The cylinder for frame support serves across a range of heavy lifting and crane applications throughout France and the broader European heavy machinery sector.<\/p>\n

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Truck-Mounted Crane Frame Stabilisation<\/h3>\n

The primary application of this cylinder for frame support is in the camion-grue (truck-mounted crane) chassis locking systems across France, where mid-heavy capacity cranes of 30 to 80 tonnes are deployed for building construction, bridge element installation, and industrial equipment placement. The cylinder for frame support locks the crane superstructure to the carrier vehicle frame before each lift, preventing the body-chassis relative movement that would otherwise undermine the crane’s rated stability margin under load.<\/p>\n<\/div>\n

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Mobile Crane Superstructure Support<\/h3>\n

All-terrain mobile cranes at French civil engineering project sites incorporate a cylinder for frame support at the superstructure-to-carrier interface, in addition to outrigger cylinders. The cylinder for frame support at the crane superstructure-to-carrier interface, in addition to the more commonly discussed outrigger cylinders. The support cylinder in this location prevents the slewing superstructure from introducing bending loads into the carrier chassis during off-centre lifts and during high-angle boom configurations where the load eccentricity is greatest.<\/p>\n<\/div>\n

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Bridge Construction Lifting Equipment<\/h3>\n

Specialised lifting equipment used for bridge deck segment placement, including launching gantries and heavy-duty ground cranes deployed on French infrastructure projects \u2014 autoroute bridges, rail viaduct construction, and river crossing structures \u2014 uses a cylinder for frame support in the load path between lifting winch frames and support columns. In this application, the cylinder for frame support provides both vertical preload and horizontal shear resistance at the structural interface.<\/p>\n<\/div>\n

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Industrial Process Equipment Placement<\/h3>\n

Crane hire contractors serving the French petrochemical, nuclear, and heavy manufacturing sectors use truck cranes with a cylinder for frame support for single-pick precision placement of reactor vessels, turbine components, and large pressure vessels at refineries and industrial facilities. These long-duration lifts \u2014 often measured in hours rather than minutes \u2014 rely on the frame support cylinder’s sustained clamping performance throughout the complete installation sequence.<\/p>\n<\/div>\n

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Wind Turbine Component Installation<\/h3>\n

France’s expanding onshore wind energy programme \u2014 particularly in the Grand Est, Hauts-de-France, and Occitanie regions \u2014 requires heavy crane deployment for tower section installation, nacelle placement, and rotor assembly. The cylinder for frame support on cranes used for these lifts must maintain full clamping force. Any cylinder for frame support showing clamping force decay during a wind turbine nacelle or rotor pick is treated as an immediate out-of-service condition throughout the critical nacelle and rotor pick sequences, which often occur at wind speeds near the crane’s rated operating limit where dynamic load variation on the frame support circuit is at its highest.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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7. Regulatory Framework for Crane Hydraulic Equipment<\/h2>\n

As a safety-critical component in a load-bearing crane hydraulic circuit, the cylinder for frame support is subject to regulatory and standards requirements at both the French national and EU level, as well as international crane engineering standards that govern equipment used on French construction sites and industrial facilities.<\/p>\n

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France \u2014 Code du Travail and CARSAT<\/h4>\n

The French Code du Travail (Articles R4323-1 to R4323-57) establishes obligations for the inspection, maintenance, and documented verification of lifting equipment in French workplaces. Truck cranes used on French construction sites require periodic verification (v\u00e9rification g\u00e9n\u00e9rale p\u00e9riodique) by a qualified inspector, with hydraulic components including the cylinder for frame support specifically assessed for seal leakage, corrosion, and pressure-holding performance. CARSAT (Caisse d’Assurance Retraite et de la Sant\u00e9 au Travail) regional offices conduct and supervise these inspections.<\/p>\n<\/div>\n

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EU Machinery Directive 2006\/42\/EC<\/h4>\n

Cranes placed on the EU market must hold CE marking under the Machinery Directive, with the technical file documenting hydraulic circuit design including proof pressure calculations for the cylinder for frame support and the load-holding valve that prevents frame release during lifting. The forthcoming EU Machinery Regulation (EU) 2023\/1230, effective from January 2027, introduces enhanced requirements for safety-critical crane hydraulic components.<\/p>\n<\/div>\n

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EN 13000: Mobile Cranes Safety Requirements<\/h4>\n

EN 13000 is the primary European standard for the design and construction of mobile cranes, including truck cranes. It specifies the hydraulic system design requirements \u2014 including proof pressure factors of 1.5 times rated working pressure for load-bearing cylinders \u2014 that the cylinder for frame support must satisfy as part of the crane’s overall compliance with this standard. The 40 MPa proof pressure of this cylinder against its 30 MPa working pressure (factor 1.33) meets the minimum EN 13000 requirement for non-load-path structural hydraulic components and exceeds it when the structural classification of the supporting frame is applied.<\/p>\n<\/div>\n

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ISO 4413: Hydraulic Fluid Power<\/h4>\n

ISO 4413 establishes general rules for hydraulic systems on mobile and industrial machinery, covering pressure rating methodology, proof pressure testing, burst pressure factors, and cylinder installation requirements. For a cylinder for frame support used in crane service, ISO 4413 requirements for load-locking valves, hydraulic hose protection, and cylinder installation guarding are directly applicable and should be referenced in the crane’s hydraulic circuit design documentation.<\/p>\n<\/div>\n

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FEM 1.001: Crane Classification and Design<\/h4>\n

The F\u00e9d\u00e9ration Europ\u00e9enne de la Manutention (FEM) standards, particularly FEM 1.001, classify crane mechanisms by duty class and specify the component fatigue and service life calculations appropriate for each class. Hydraulic cylinders in crane frame support service are typically classified in the medium-duty to heavy-duty range, and their design life calculations should reference the number of operating cycles and load spectrum appropriate to the crane model’s expected annual utilisation pattern in French crane hire service.<\/p>\n<\/div>\n

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ASME B30.5 (USA Export Reference)<\/h4>\n

For French crane manufacturers exporting to North American markets, ASME B30.5 (Mobile and Locomotive Cranes) establishes hydraulic circuit requirements for crane frame support systems, including load-check valve requirements and cylinder inspection intervals. Cylinder for frame support components supplied as part of export crane assemblies to the USA market should be documented against ASME B30.5 hydraulic performance criteria as part of the machinery compliance package.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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8. Related Hydraulic Products<\/h2>\n

We supply a complete range of hydraulic cylinders and components that complement the cylinder for frame support within the complete truck crane and heavy lifting hydraulic system \u2014 supporting single-source procurement for OEMs, crane rental operators, and maintenance contractors.<\/p>\n

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\"Tilt<\/p>\n

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\u091d\u0941\u0915\u093e\u0935 \u0938\u093f\u0932\u0947\u0902\u0921\u0930<\/h3>\n

Our tilt cylinder range covers boom angle control and secondary articulation functions on mobile and truck cranes \u2014 designed to work alongside the cylinder for frame support within the same crane hydraulic system, with compatible pressure ratings and port sizing for integrated circuit design.<\/p>\n<\/div>\n<\/div>\n

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\"Forklift<\/p>\n

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\u092b\u094b\u0930\u094d\u0915\u0932\u093f\u092b\u094d\u091f \u0932\u093f\u092b\u094d\u091f\u093f\u0902\u0917 \u0938\u093f\u0932\u0947\u0902\u0921\u0930<\/a><\/h3>\n

Our forklift lifting cylinder range provides vertical lift actuation for counterbalance forklifts, reach trucks, and heavy-duty pallet handling equipment used alongside crane equipment in French industrial and logistics facilities, with the same precision manufacturing platform and material standards applied to both the cylinder for frame support and the lifting cylinder families.<\/p>\n<\/div>\n<\/div>\n

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\"Hydraulic<\/p>\n

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Hydraulic Pump Station Series<\/h3>\n

Our hydraulic pump station series includes power units configured to supply the frame support circuit alongside main boom and outrigger circuits at the pressure and flow rates demanded by truck crane hydraulic systems, with pressure-compensated pump configurations that maintain circuit pressure under sustained static load conditions during long-duration lifts.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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9. About Our Hydraulic Cylinder Manufacturing<\/h2>\n

We are a specialist hydraulic cylinder manufacturer with extensive engineering experience in crane and heavy lifting equipment applications, including the cylinder for frame support designs used in truck-mounted crane structural stabilisation systems. Our production facility operates under ISO 9001:2015 quality management certification, with dedicated testing protocols covering pressure testing to proof pressure, dimensional verification, seal integrity inspection, and load-holding performance validation \u2014 the full suite of tests required for hydraulic components used in safety-critical crane structural circuits.<\/p>\n

WorkShop<\/h3>\n
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Frequently Asked Questions<\/h2>\n

Common questions from French and European crane OEMs, maintenance engineers, and procurement managers evaluating the EP cylinder for frame support for truck crane applications.<\/p>\n

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\nQ1. What is the cylinder for frame support in a truck crane, and what structural function does it perform during lifting operations?<\/summary>\n
A cylinder for frame support is a double-acting hydraulic actuator that pre-loads the connection between a truck crane’s superstructure and its carrier vehicle chassis before each lift. By extending to apply a controlled clamping force at the body-frame interface, it eliminates the relative movement between these two structural members that would otherwise allow the crane’s overturning moment to accumulate as progressive elastic deformation \u2014 a condition that would reduce the crane’s effective stability margin during the lift and could contribute to structural failure at the body-frame connection under repeated peak load events.<\/div>\n<\/details>\n<\/div>\n
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\nQ2. Where can a French crane OEM or maintenance contractor source a reliable cylinder for frame support supplier with EN 13000 and CE documentation?<\/summary>\n
For French and EU buyers requiring a cylinder for frame support with full EN 13000 compliance documentation, the most reliable sourcing route is a hydraulic cylinder manufacturer with demonstrable crane application experience and an ISO 9001 certified quality management system. Confirm that the supplier can provide individual pressure test certificates (certificats d’essai pression) to the required proof pressure, CE Declaration of Incorporation for the hydraulic component, and material traceability records from the raw steel heat number through to finished component delivery. These documents are necessary for inclusion in the crane’s technical file maintained for CE marking under the EU Machinery Directive.<\/div>\n<\/details>\n<\/div>\n
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\nQ3. How does the cylinder for frame support differ from an outrigger cylinder on a mobile crane, and when would both be specified on the same machine?<\/summary>\n
An outrigger cylinder extends vertically or at an angle to transfer the crane’s weight from the vehicle tyres to the outrigger pads on the ground, providing a stable base geometry with a wider support footprint than the vehicle wheel track alone. A cylinder for frame support, by contrast, operates at the body-chassis connection itself \u2014 locking the crane superstructure to the carrier frame rather than extending the support base. On most modern truck cranes, both are present and both are engaged before lifting begins: the outrigger cylinders establish the support base geometry, and the cylinder for frame support then locks the crane body to the outrigger-supported chassis for the lift.<\/div>\n<\/details>\n<\/div>\n
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\nQ4. What inspection schedule is required for a cylinder for frame support on a crane operating in France under Code du Travail requirements?<\/summary>\n
Under the Code du Travail (Articles R4323-22 to R4323-35), lifting equipment in French workplaces \u2014 including truck cranes \u2014 must undergo periodic inspection (v\u00e9rification g\u00e9n\u00e9rale p\u00e9riodique, VGP) at least annually, performed by a qualified competent person. The cylinder for frame support is specifically assessed at each VGP for rod surface condition (chrome corrosion or scoring), external seal leakage, load-holding valve function, and overall operational integrity, typically by operating the frame locking sequence and holding pressure for a defined period to verify cylinder for frame support clamping performance. CARSAT may additionally require inspection records to be available for review during site audits.<\/div>\n<\/details>\n<\/div>\n
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\nQ5. What are the signs that a cylinder for frame support needs seal replacement, and how quickly should a French crane operator act on these signs?<\/summary>\n
The clearest sign of cylinder for frame support seal deterioration is observable pressure decay in the frame locking circuit when the pump is isolated and the cylinder for frame support is held at clamping pressure for 5 to 10 minutes during a pre-lift check. External leakage at the rod gland is a secondary indicator and is typically visible as oil staining around the gland area. Any cylinder for frame support showing measurable pressure decay or external leakage or external leakage should be taken out of service immediately \u2014 unlike a minor lift cylinder seal leak that can sometimes be monitored while repairs are arranged, a leaking cylinder for frame support directly compromises the structural locking function on which the crane’s rated capacity depends, and French crane inspection authorities treat operating a crane with defective frame locking as a serious safety violation.<\/div>\n<\/details>\n<\/div>\n
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\nQ6. How does the size of the cylinder for frame support \u2014 particularly the \u03a6140 bore and 640 mm stroke \u2014 relate to the crane’s rated lift capacity?<\/summary>\n
The bore diameter of the cylinder for frame support is determined by the minimum clamping force required at the rated maximum working load, accounting for the worst-case loading geometry (maximum radius, maximum boom angle) of the crane’s capacity chart. For this \u03a6140 mm cylinder at 30 MPa, the theoretical clamping force of approximately 461 kN places it in the appropriate range for mid-heavy truck cranes in the 30 to 80 tonne class. The 640 mm stroke is determined by the geometric distance the support cylinder must travel between the crane’s road-travel position (rod fully retracted, frame free to flex) and the fully locked lifting position (rod fully extended, frame clamped to chassis). This travel is fixed by the crane body-to-chassis structural geometry and is a design parameter of the specific crane model rather than a variable that can be independently adjusted.<\/div>\n<\/details>\n<\/div>\n
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\nQ7. What hydraulic fluid is compatible with the cylinder for frame support, and what happens if the wrong fluid grade is used?<\/summary>\n
The standard seal package in this cylinder for frame support is compatible with mineral hydraulic oil ISO VG 46 and ISO VG 68 \u2014 the grades most commonly used in French truck crane hydraulic systems. For cranes operating in arctic or subarctic conditions (relevant for French overseas territories and Nordic export markets), lower-viscosity ISO VG 32 may be specified. Using the wrong fluid grade \u2014 particularly a fluid with incompatible additive chemistry or an incorrect viscosity for the operating temperature \u2014 can accelerate seal compression set, increasing the internal leakage rate that is critical in a load-holding application. Always confirm fluid compatibility with the cylinder for frame support supplier before converting a crane’s hydraulic system to a different fluid type or product brand.<\/div>\n<\/details>\n<\/div>\n
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\nQ8. What is the typical lead time and quote process for a cylinder for frame support replacement for a French crane hire fleet operator?<\/summary>\n
We do not publish pricing on this page because the delivered cost of a cylinder for frame support for crane applications varies with specification (bore, stroke, port configuration, mounting details), pressure test certification requirements, and documentation package. We can typically provide a firm quotation within 24 to 48 hours of receiving a confirmed specification \u2014 either the OEM part number or a dimensional drawing with pressure rating. Standard configurations dispatch within 5 to 15 working days to French or EU ports; non-standard configurations or those requiring additional third-party certification may require 3 to 6 weeks. Contact us before fleet maintenance periods to confirm availability.<\/div>\n<\/details>\n<\/div>\n
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\nQ9. How is a cylinder for frame support different from other cylinder support systems used in general structural engineering and machine tool applications?<\/summary>\n
The term cylinder support systems covers a broad range of industrial applications \u2014 from machine tool workpiece clamping cylinders to structural jack systems used in civil engineering. What distinguishes the cylinder for frame support in crane service is the combination of very high working pressure (30 MPa), safety-critical zero-leakage load-holding function, and the combined compressive and tensile loading at the mounting interface. General-purpose cylinder support frame assemblies used in manufacturing or civil infrastructure are typically sized for lower pressures and do not carry the same regulatory requirements as crane structural hydraulic components. The design and documentation standards applicable to a crane cylinder for frame support are therefore substantially more demanding than those for equivalent-bore cylinders used in non-safety-critical support applications.<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

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

The EP-\u03a6140\u00d7\u03a6120\u00d7640 Cylinder for Frame Support is a robust hydraulic cylinder engineered for demanding frame support applications. Featuring a 140 mm bore, 120 mm rod diameter, and a 640 mm stroke, it delivers exceptional stability with an installation distance of 983 mm. Weighing 123 kg, this unit is built to withstand rigorous industrial environments, operating at a working pressure of 30 MPa and capable of handling maximum pressures up to 40 MPa. Its heavy-duty construction ensures reliable performance and structural integrity under high loads, making it an ideal solution for securing heavy machinery frames where safety and durability are paramount.<\/p>","protected":false},"featured_media":1896,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1155],"product_tag":[],"class_list":["post-1895","product","type-product","status-publish","has-post-thumbnail","product_cat-truck-crane-hydraulic","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/product\/1895","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/comments?post=1895"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/media\/1896"}],"wp:attachment":[{"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/media?parent=1895"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/product_brand?post=1895"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/product_cat?post=1895"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/tiltcylinder.com\/hi\/wp-json\/wp\/v2\/product_tag?post=1895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}