[{"data":1,"prerenderedAt":537},["ShallowReactive",2],{"site-header-product-categories-v40":3,"public-navigation-primary-v1":177,"resource-troubleshooting-hydraulic-cylinder-leaking":238},[4,32,52,72,92,117,137,157],{"id":5,"title":6,"body":7,"description":14,"extension":15,"geo":16,"h1":6,"indexStatus":21,"lastReviewed":22,"meta":23,"navigation":24,"path":25,"seo":26,"slug":28,"sortOrder":29,"stem":30,"__hash__":31},"productCategories\u002Fproduct-categories\u002Fhydraulic-gear-pumps.md","Hydraulic Gear Pump",{"type":8,"value":9,"toc":10},"minimark",[],{"title":11,"searchDepth":12,"depth":12,"links":13},"",2,[],"Browse hydraulic gear pumps by brand and verified Series for product identification, replacement review, and quotation.","md",{"directAnswer":17,"keyFacts":18,"verificationNotes":19},"This category organizes hydraulic gear pumps by brand and verified Series. Verify the exact model, displacement, rotation, mounting, and port configuration before selection.",[],[20],"Model-specific technical data must be verified before final selection or replacement review.","review","2026-08-24",{},true,"\u002Fproduct-categories\u002Fhydraulic-gear-pumps",{"title":27,"description":14,"noindex":24},"Hydraulic Gear Pump | BOETH","hydraulic-gear-pumps",10,"product-categories\u002Fhydraulic-gear-pumps","YbWmrJjwlinJE2t9YLGBhV2j502ZvLgcglpn4tmkq1c",{"id":33,"title":34,"body":35,"description":39,"extension":15,"geo":40,"h1":34,"indexStatus":21,"lastReviewed":22,"meta":44,"navigation":24,"path":45,"seo":46,"slug":48,"sortOrder":49,"stem":50,"__hash__":51},"productCategories\u002Fproduct-categories\u002Fhydraulic-vane-pumps.md","Hydraulic Vane Pump",{"type":8,"value":36,"toc":37},[],{"title":11,"searchDepth":12,"depth":12,"links":38},[],"Browse hydraulic vane pumps by brand and verified Series for product identification, replacement review, and quotation.",{"directAnswer":41,"keyFacts":42,"verificationNotes":43},"This category organizes hydraulic vane pumps by brand and verified Series. Series-level ranges must not be treated as confirmed specifications for an individual model.",[],[20],{},"\u002Fproduct-categories\u002Fhydraulic-vane-pumps",{"title":47,"description":39,"noindex":24},"Hydraulic Vane Pump | BOETH","hydraulic-vane-pumps",20,"product-categories\u002Fhydraulic-vane-pumps","emN8VRhwxeS_cK5LfuU2qhJ8F6xmjC0X9yNygCpj05Y",{"id":53,"title":54,"body":55,"description":59,"extension":15,"geo":60,"h1":54,"indexStatus":21,"lastReviewed":22,"meta":64,"navigation":24,"path":65,"seo":66,"slug":68,"sortOrder":69,"stem":70,"__hash__":71},"productCategories\u002Fproduct-categories\u002Fhydraulic-piston-pumps.md","Hydraulic Piston Pumps",{"type":8,"value":56,"toc":57},[],{"title":11,"searchDepth":12,"depth":12,"links":58},[],"Browse hydraulic piston pumps by brand and verified Series for product identification, replacement review, and quotation.",{"directAnswer":61,"keyFacts":62,"verificationNotes":63},"This category organizes hydraulic piston pumps by brand and verified Series. 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Confirm the motor family before reviewing model-specific displacement, pressure, speed, or mounting data.",[],[20],{},"\u002Fproduct-categories\u002Fhydraulic-motors",{"title":87,"description":79,"noindex":24},"Hydraulic Motors | BOETH","hydraulic-motors",40,"product-categories\u002Fhydraulic-motors","3TPdTNXVH4Zpl1fFFGpdUuJNr3zyQsoMhC2lnEiUFfY",{"id":93,"title":94,"body":95,"description":99,"extension":15,"geo":100,"h1":94,"indexStatus":21,"lastReviewed":108,"meta":109,"navigation":24,"path":110,"seo":111,"slug":113,"sortOrder":114,"stem":115,"__hash__":116},"productCategories\u002Fproduct-categories\u002Fhydraulic-valves.md","Hydraulic Valves",{"type":8,"value":96,"toc":97},[],{"title":11,"searchDepth":12,"depth":12,"links":98},[],"Hydraulic valve products for directional, pressure and flow control in industrial hydraulic circuits.",{"directAnswer":101,"keyFacts":102,"verificationNotes":106},"Hydraulic Valves are organized first by hydraulic product type, then by relevant series or individual model. Brand names are retained only as product or compatibility-reference attributes, not as a separate website category.",[103,104,105],"Category pages support product-type discovery and comparison.","Series pages sit under the relevant product category when a real series exists.","Model-specific operating data should be verified before final selection.",[107],"Verify model-specific technical data before final selection or substitution.","2026-08-21",{},"\u002Fproduct-categories\u002Fhydraulic-valves",{"title":112,"description":99,"noindex":24},"Hydraulic Valves for Industrial Applications","hydraulic-valves",50,"product-categories\u002Fhydraulic-valves","do0c3wgKE3rsF9IHbhXqGVYNDpTp_ky024U6GoN1RSE",{"id":118,"title":119,"body":120,"description":124,"extension":15,"geo":125,"h1":119,"indexStatus":21,"lastReviewed":108,"meta":129,"navigation":24,"path":130,"seo":131,"slug":133,"sortOrder":134,"stem":135,"__hash__":136},"productCategories\u002Fproduct-categories\u002Fhydraulic-cylinders.md","Hydraulic Cylinders",{"type":8,"value":121,"toc":122},[],{"title":11,"searchDepth":12,"depth":12,"links":123},[],"Industrial hydraulic cylinders for machinery, replacement and engineered motion applications.",{"directAnswer":126,"keyFacts":127,"verificationNotes":128},"Hydraulic cylinders are industrial hydraulic actuators used to convert hydraulic pressure into linear motion. Browse available cylinder types, series, and replacement options for identification and selection.",[103,104,105],[107],{},"\u002Fproduct-categories\u002Fhydraulic-cylinders",{"title":132,"description":124,"noindex":24},"Hydraulic Cylinders for Industrial Applications","hydraulic-cylinders",60,"product-categories\u002Fhydraulic-cylinders","-ErjJ52c9XO4ywSudNjfR473ED-qKjMnv5S58xDb8IE",{"id":138,"title":139,"body":140,"description":144,"extension":15,"geo":145,"h1":139,"indexStatus":21,"lastReviewed":108,"meta":149,"navigation":24,"path":150,"seo":151,"slug":153,"sortOrder":154,"stem":155,"__hash__":156},"productCategories\u002Fproduct-categories\u002Fhydraulic-workholding.md","Hydraulic Workholding",{"type":8,"value":141,"toc":142},[],{"title":11,"searchDepth":12,"depth":12,"links":143},[],"Hydraulic clamping, work support and fixture components for machining and production systems.",{"directAnswer":146,"keyFacts":147,"verificationNotes":148},"Hydraulic Workholding are organized first by hydraulic product type, then by relevant series or individual model. Brand names are retained only as product or compatibility-reference attributes, not as a separate website category.",[103,104,105],[107],{},"\u002Fproduct-categories\u002Fhydraulic-workholding",{"title":152,"description":144,"noindex":24},"Hydraulic Workholding for Industrial Applications","hydraulic-workholding",70,"product-categories\u002Fhydraulic-workholding","tdyIs0WKdOkc03IEYpHOGGma0lfcW3-hqE_TEjbBAvg",{"id":158,"title":159,"body":160,"description":164,"extension":15,"geo":165,"h1":159,"indexStatus":21,"lastReviewed":22,"meta":169,"navigation":24,"path":170,"seo":171,"slug":173,"sortOrder":174,"stem":175,"__hash__":176},"productCategories\u002Fproduct-categories\u002Fhydraulic-components.md","Hydraulic Components",{"type":8,"value":161,"toc":162},[],{"title":11,"searchDepth":12,"depth":12,"links":163},[],"Browse hydraulic pump parts, hydraulic motor parts, and accumulators using verified component-family relationships.",{"directAnswer":166,"keyFacts":167,"verificationNotes":168},"Hydraulic Components is organized first by component type. 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Also check gland or rod-bearing condition and cylinder-to-load alignment.",[249,288,289],{},"Excessive side load can increase bearing clearance and force the rod against one side of the sealing system. A new rod seal installed without correcting the alignment or bearing problem can fail again.",[249,291,292],{},"Seal condition can provide additional evidence. Abrasive scoring, hard or cracked material, swelling, shrinkage and extrusion indicate different failure mechanisms and should be evaluated separately.",[249,294,295],{},"For detailed seal-damage analysis, use the Hydraulic Cylinder Seal Failure troubleshooting guide.",[244,297,299],{"id":298},"leakage-at-a-head-cap-or-cylinder-body-joint","Leakage at a Head, Cap or Cylinder Body Joint",[249,301,302],{},"Oil at a static joint between the cylinder tube and the head, cap or another body interface should be separated from rod-seal leakage.",[249,304,305],{},"Depending on cylinder construction, possible causes include a damaged or extruded body seal, loss of the required joint preload, loose tie rods or excessive pressure.",[249,307,308],{},"Do not apply a universal tie-rod torque or tightening procedure. Cylinder construction, bore size, fastener specification and manufacturer assembly requirements determine the correct procedure.",[249,310,311],{},"If excessive pressure contributed to the leak, simply replacing the body seal may not prevent recurrence. Verify the actual operating pressure and the cylinder pressure rating before returning the cylinder to service.",[244,313,315],{"id":314},"leakage-at-a-hydraulic-port-or-connection","Leakage at a Hydraulic Port or Connection",[249,317,318],{},"Oil around a cylinder port can originate from the hose, adapter, coupler, fitting, port seal or connection rather than from the cylinder's internal or external sealing system.",[249,320,321],{},"Clean the connection and identify the source before disassembling the cylinder.",[249,323,324],{},"After the circuit has been safely isolated and depressurized, inspect the mating connection, sealing element, fitting condition and port for damage or incorrect assembly.",[249,326,327],{},"Do not use uncontrolled additional tightening as a generic leak repair. The fitting and port must be assembled according to their specified sealing method and torque or installation requirements.",[244,329,331],{"id":330},"leakage-from-the-cylinder-body-or-structural-area","Leakage from the Cylinder Body or Structural Area",[249,333,334],{},"Oil emerging from a tube wall, weld, casting or another pressure-containing structural area is fundamentally different from a routine seal leak.",[249,336,337],{},"Visible cracking, corrosion, impact damage or permanent deformation requires assessment of the pressure-containing component itself.",[249,339,340],{},"Do not attempt to classify a structural pressure-boundary leak as a seal-kit problem. The cylinder should remain out of service until the damaged component has been inspected and an approved repair or replacement decision has been made.",[244,342,344],{"id":343},"pressure-can-change-the-failure-mechanism","Pressure Can Change the Failure Mechanism",[249,346,347],{},"External leakage should also be considered in relation to actual cylinder-port pressure.",[249,349,350],{},"A cylinder can experience operating conditions that differ from the nominal pump setting. Circuit restrictions and pressure intensification can expose some sealing areas to higher pressure than expected.",[249,352,353],{},"Measure pressure at the relevant cylinder port during the fault condition when an approved diagnostic procedure allows it.",[249,355,356],{},"Any pressure measurement must remain within the ratings of the cylinder, valves, hoses, fittings and machine.",[244,358,360],{"id":359},"when-to-use-the-seal-failure-guide","When to Use the Seal Failure Guide",[249,362,363,364,368],{},"Use this leaking-cylinder page to determine ",[365,366,367],"strong",{},"where the hydraulic oil is escaping",".",[249,370,371,372,368],{},"Use the Hydraulic Cylinder Seal Failure guide when a seal has been removed or inspected and the question becomes ",[365,373,374],{},"why the seal failed",[249,376,377],{},"Examples include:",[259,379,380,383,386,389,392,395],{},[262,381,382],{},"one-sided wear,",[262,384,385],{},"scoring or abrasion,",[262,387,388],{},"hard or cracked material,",[262,390,391],{},"swelling or shrinkage,",[262,393,394],{},"sticky or gummy material,",[262,396,397],{},"and extrusion or feathered edges.",[249,399,400],{},"Separating leak location from seal failure analysis avoids treating every external leak as the same maintenance problem.",[244,402,404],{"id":403},"repair-or-replacement-decision","Repair or Replacement Decision",[249,406,407],{},"A seal repair is appropriate only when the cylinder's pressure-containing components, rod, bore, bearings, mounting and relevant sealing surfaces remain serviceable and the root cause of the leak has been corrected.",[249,409,410],{},"Repair scope should expand when rod damage, bearing wear, body-seal damage or other component defects are confirmed.",[249,412,413],{},"A replacement review is more appropriate when structural damage, severe corrosion, permanent deformation or incompatible cylinder geometry prevents the original cylinder from being restored and verified reliably.",{"title":11,"searchDepth":12,"depth":12,"links":415},[416,417,418,419,420,421,422,423],{"id":246,"depth":12,"text":247},{"id":279,"depth":12,"text":280},{"id":298,"depth":12,"text":299},{"id":314,"depth":12,"text":315},{"id":330,"depth":12,"text":331},{"id":343,"depth":12,"text":344},{"id":359,"depth":12,"text":360},{"id":403,"depth":12,"text":404},"Diagnose external hydraulic cylinder leakage by first locating whether oil is escaping at the rod and gland, cylinder body seals, hydraulic connections or the cylinder body itself.",[426,442,458,474],{"id":427,"label":428,"physicalEvidence":429,"possibleCauses":432,"recommendedActions":437},"leak-at-rod-or-gland","Oil Leaks at the Rod or Gland",[430,431],"Hydraulic oil appears around the piston rod where it exits the cylinder head or gland.","Oil may form a film on the rod, collect around the gland or increase during cycling.",[433,434,435,436],"Worn or damaged rod seal or buffer seal.","Scored, corroded or otherwise damaged piston rod surface.","Excessive rod-bearing or gland clearance caused by wear or side loading.","Seal deterioration caused by temperature, fluid incompatibility, contamination or abnormal pressure.",[438,439,440,441],"Clean the area and confirm that the oil is emerging from the rod-gland interface rather than running down from a port or another connection.","Inspect rod surface condition, gland or bearing wear, cylinder alignment and load guidance before replacing the rod seal.","Review the failed seal condition for evidence of abrasion, chemical damage, thermal degradation or extrusion.","Correct the underlying wear or operating condition before installing replacement seals.",{"id":443,"label":444,"physicalEvidence":445,"possibleCauses":448,"recommendedActions":453},"leak-at-head-cap-or-body-joint","Oil Leaks at a Head, Cap or Cylinder Body Joint",[446,447],"Oil appears at a static joint between the cylinder tube and head, cap or other body-seal interface.","The piston rod and hydraulic port connections remain dry while oil forms around the cylinder body joint.",[449,450,451,452],"Damaged, pinched, extruded or worn cylinder body seal.","Loss of the required joint preload or loose tie rods on an applicable tie-rod cylinder.","Pressure has exceeded the cylinder or sealing-system design condition.","Joint or sealing surfaces are damaged or no longer maintaining the required seal compression.",[454,455,456,457],"Isolate and depressurize the hydraulic system before inspecting the body joint or fasteners.","Confirm that the leak originates at the cylinder body seal and is not migrating from a nearby port or fitting.","Check tie-rod torque, joint assembly requirements and pressure limits only against the specific cylinder manufacturer's service data.","Inspect body seals and sealing surfaces during qualified disassembly before deciding whether a seal replacement is sufficient.",{"id":459,"label":460,"physicalEvidence":461,"possibleCauses":464,"recommendedActions":469},"leak-at-port-or-connection","Oil Appears at a Hydraulic Port or Connection",[462,463],"Oil collects around a cylinder port, adapter, fitting, hose connection or coupler.","The apparent cylinder leak changes after the connection is cleaned, repositioned or inspected.",[465,466,467,468],"Loose, damaged or improperly assembled hydraulic connection.","Damaged port seal, fitting seal or sealing surface.","Incorrect fitting or sealing method for the cylinder port.","Damage to the cylinder port or surrounding connection area.",[470,471,472,473],"Do not assume the cylinder sealing system has failed until the connection itself has been checked.","Isolate and fully depressurize the circuit before touching a hydraulic connection.","Inspect the fitting, port, sealing element and mating surfaces against the component manufacturer's requirements.","Replace damaged connection components rather than attempting to stop leakage by uncontrolled additional tightening.",{"id":475,"label":476,"physicalEvidence":477,"possibleCauses":480,"recommendedActions":484},"leak-from-cylinder-body-or-structural-area","Oil Leaks from the Cylinder Body or a Damaged Structural Area",[478,479],"Oil appears from the tube, weld, casting or another structural area rather than from a normal seal joint or hydraulic connection.","Visible corrosion, impact damage, cracking, permanent deformation or other structural damage may be present.",[481,482,483],"Damaged cylinder tube, welded structure, casting or pressure-containing component.","Corrosion, impact or mechanical damage has compromised the pressure boundary.","Abnormal pressure or mechanical loading has damaged the cylinder structure.",[485,486,487,488],"Remove the cylinder from service and follow the machine manufacturer's isolation procedure.","Do not treat a pressure-boundary crack or structural leak as a routine seal-replacement problem.","Have the damaged pressure-containing component assessed using the cylinder manufacturer's repair requirements.","Use replacement review when the pressure boundary or cylinder geometry cannot be restored and verified reliably.",{"directAnswer":490,"keyFacts":491,"verificationNotes":496},"External hydraulic cylinder leakage should be diagnosed first by locating exactly where the oil leaves the system. Leakage at the rod and gland points toward the dynamic sealing, rod surface or gland condition; leakage at a head, cap or tube joint points toward a cylinder body seal or joint problem; oil at a hydraulic port may come from the connection rather than the cylinder; and leakage from a tube, weld or other pressure-containing structure requires structural assessment. Isolate and depressurize the machine before touching any hydraulic connection or cylinder joint.",[492,493,494,495],"The location of the oil leak should be confirmed before a seal kit or replacement cylinder is selected.","Oil around a cylinder port or fitting does not by itself prove that the cylinder seals are leaking.","Rod-seal leakage can be secondary to rod damage, gland wear, side loading, contamination, temperature, fluid incompatibility or abnormal pressure.","A leak from a pressure-containing tube, weld or structural component should not be treated as a routine seal failure.",[497,498],"Never loosen a fitting, port connection, gland, head, cap or tie rod while the cylinder may contain trapped hydraulic pressure.","Follow the specific cylinder and machine manufacturer's inspection, pressure and repair procedures before returning equipment to service.","published",{},"\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-leaking","external-leakage",[504,509,512],{"publisher":505,"title":506,"url":507,"sourceType":508},"Parker Hannifin","Hydraulic Cylinder Troubleshooting — Avoiding Rod Seal Leakage and Premature Wear","https:\u002F\u002Fwww.parker.com\u002Fcontent\u002Fdam\u002FParker-com\u002FLiterature\u002FLiterature-Files\u002Feuro_cylinder\u002Fv4\u002FTrouble_1242-1-gb.pdf","manufacturer",{"publisher":505,"title":510,"url":511,"sourceType":508},"Cylinder Safety Guide — Cylinder Troubleshooting","https:\u002F\u002Fwww.parker.com\u002Fcontent\u002Fdam\u002FParker-com\u002FLiterature\u002FAtlas-Cylinder\u002FPDF\u002FAC0800-01-T1.pdf",{"publisher":513,"title":514,"url":515,"sourceType":508},"Enerpac","Hydraulic System Troubleshooting","https:\u002F\u002Fliterature.enerpac.com\u002Fpdf\u002FL4256_c_EN.pdf",[517,518,519],"tie-rod-hydraulic-cylinder","welded-hydraulic-cylinder","mill-type-hydraulic-cylinder",[521,524],{"label":522,"path":523},"Hydraulic Cylinder Seal Failure","\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-seal-failure\u002F",{"label":525,"path":526},"Hydraulic Cylinder Internal Leakage","\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-internal-leakage\u002F",[],[529],{"label":195,"path":196},{"title":531,"description":532,"noindex":533},"Hydraulic Cylinder Leaking: Causes & Troubleshooting | BOETH","Diagnose external cylinder leaks at the rod, gland, body seals, ports and hydraulic connections before deciding whether seals or the cylinder require repair.",false,"hydraulic-cylinder-leaking","resources\u002Ftroubleshooting\u002Fhydraulic-cylinder-leaking","ftGe2QRaJBHgZONNH9ziwLCX1eQVZfJXHFdBdGZ4vgo",1792667602216]