[{"data":1,"prerenderedAt":635},["ShallowReactive",2],{"site-header-product-categories-v40":3,"public-navigation-primary-v1":177,"resource-troubleshooting-hydraulic-cylinder-seal-failure":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. Use the brand and Series path before reviewing model-specific technical data.",[],[20],{},"\u002Fproduct-categories\u002Fhydraulic-piston-pumps",{"title":67,"description":59,"noindex":24},"Hydraulic Piston Pumps | BOETH","hydraulic-piston-pumps",30,"product-categories\u002Fhydraulic-piston-pumps","4OTZ-e6Bbra_6kgqOPqPI88tu4MJ0YsGkFpeQ5OKeyk",{"id":73,"title":74,"body":75,"description":79,"extension":15,"geo":80,"h1":74,"indexStatus":21,"lastReviewed":22,"meta":84,"navigation":24,"path":85,"seo":86,"slug":88,"sortOrder":89,"stem":90,"__hash__":91},"productCategories\u002Fproduct-categories\u002Fhydraulic-motors.md","Hydraulic Motors",{"type":8,"value":76,"toc":77},[],{"title":11,"searchDepth":12,"depth":12,"links":78},[],"Browse hydraulic motors by brand and verified Series for product identification, replacement review, and quotation.",{"directAnswer":81,"keyFacts":82,"verificationNotes":83},"This category organizes hydraulic motors by brand and verified Series. 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. Lower-level structure may use a verified brand and Series relationship or a real product family when appropriate.",[],[20],{},"\u002Fproduct-categories\u002Fhydraulic-components",{"title":172,"description":164,"noindex":24},"Hydraulic Components | BOETH","hydraulic-components",80,"product-categories\u002Fhydraulic-components","n4FGFUOgNDSkAVeLBp6JKnEm-c7oMxPoSdMsHlaY-ug",[178,183,188,208,233],{"id":179,"label":180,"to":181,"visible":24,"sortOrder":29,"children":182},"home","Home","\u002F",[],{"id":184,"label":185,"to":186,"visible":24,"sortOrder":49,"children":187},"products","Products","\u002Fproducts\u002F",[],{"id":189,"label":190,"to":191,"visible":24,"sortOrder":69,"children":192},"engineering-tools","Engineering Tools","\u002Fengineering-tools\u002F",[193,198,203],{"id":194,"label":195,"to":196,"visible":24,"sortOrder":29,"children":197},"cross-reference","Cross Reference","\u002Fcross-reference\u002F",[],{"id":199,"label":200,"to":201,"visible":24,"sortOrder":49,"children":202},"product-selector","Product Selector","\u002Fproduct-selector\u002F",[],{"id":204,"label":205,"to":206,"visible":24,"sortOrder":69,"children":207},"sizing-calculator","Sizing Calculator","\u002Fsizing-calculator\u002F",[],{"id":209,"label":210,"to":211,"visible":24,"sortOrder":89,"children":212},"resources","Resources","\u002Fresources\u002F",[213,218,223,228],{"id":214,"label":215,"to":216,"visible":24,"sortOrder":29,"children":217},"selection-guides","Selection Guides","\u002Fresources\u002Fselection-guides\u002F",[],{"id":219,"label":220,"to":221,"visible":24,"sortOrder":49,"children":222},"technical-guides","Technical Guides","\u002Fresources\u002Ftechnical-guides\u002F",[],{"id":224,"label":225,"to":226,"visible":24,"sortOrder":69,"children":227},"troubleshooting","Troubleshooting","\u002Fresources\u002Ftroubleshooting\u002F",[],{"id":229,"label":230,"to":231,"visible":24,"sortOrder":89,"children":232},"faq","FAQ","\u002Fresources\u002Ffaq\u002F",[],{"id":234,"label":235,"to":236,"visible":24,"sortOrder":114,"children":237},"about","About Us","\u002Fabout\u002F",[],{"id":239,"title":240,"body":241,"category":133,"contentType":224,"description":511,"diagnostics":512,"extension":15,"geo":591,"h1":240,"indexStatus":601,"lastReviewed":108,"meta":602,"navigation":24,"path":603,"problemType":604,"publishedAt":108,"references":605,"relatedProductTypes":614,"relatedResources":618,"relatedSeries":625,"relatedTools":626,"seo":628,"slug":632,"stem":633,"__hash__":634},"troubleshootingGuides\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-seal-failure.md","Hydraulic Cylinder Seal Failure: Causes & Troubleshooting",{"type":8,"value":242,"toc":501},[243,248,252,260,263,266,288,291,295,298,301,304,307,311,314,317,320,323,326,330,333,336,339,342,346,349,352,355,375,378,381,385,388,391,394,414,417,420,424,427,430,459,462,466,469,472,475,498],[244,245,247],"h2",{"id":246},"use-the-failed-seal-as-diagnostic-evidence","Use the Failed Seal as Diagnostic Evidence",[249,250,251],"p",{},"This page is intended for failure analysis after a hydraulic cylinder seal has been inspected or removed.",[249,253,254,255,259],{},"If the primary question is simply ",[256,257,258],"strong",{},"where external oil is leaking from the cylinder",", begin with the Hydraulic Cylinder Leaking troubleshooting guide.",[249,261,262],{},"Once a seal has been identified as damaged, its wear pattern can help determine why the failure occurred.",[249,264,265],{},"The useful evidence includes:",[267,268,269,273,276,279,282,285],"ul",{},[270,271,272],"li",{},"where the wear is concentrated,",[270,274,275],{},"whether the seal is cut or abraded,",[270,277,278],{},"whether the material is hard or brittle,",[270,280,281],{},"whether it has swollen or shrunk,",[270,283,284],{},"whether the surface has become sticky or gummy,",[270,286,287],{},"and whether the sealing edge has extruded or feathered.",[249,289,290],{},"The condition of the rod, bore, bearing, gland, wiper and other adjacent components should be recorded at the same time.",[244,292,294],{"id":293},"one-sided-wear-indicates-a-load-path-problem","One-Sided Wear Indicates a Load-Path Problem",[249,296,297],{},"Seal or rod-bearing wear concentrated mainly on one side is not the same failure pattern as uniform service wear.",[249,299,300],{},"Check cylinder-to-load alignment, machine guidance, rod straightness and rod-bearing or gland clearance.",[249,302,303],{},"A hydraulic cylinder should transmit force along its axis to a properly guided load. Significant transverse loading increases contact on one side of the rod bearing and dynamic seal and can produce repeated premature failure.",[249,305,306],{},"For long-stroke compression applications, also verify rod diameter, mounting arrangement and column stability rather than treating the seal as an isolated component.",[244,308,310],{"id":309},"scoring-cuts-and-abrasion","Scoring, Cuts and Abrasion",[249,312,313],{},"Scoring and abrasive tracks indicate that the dynamic sealing interface has been damaged mechanically.",[249,315,316],{},"Possible sources include contaminated hydraulic fluid, external particles entering past the wiper, a damaged rod or bore surface, or contamination introduced during service.",[249,318,319],{},"Inspect both the failed seal and the mating surface.",[249,321,322],{},"Installing a new elastomer against a damaged rod or bore can reproduce the same failure quickly, even if the replacement seal itself is correct.",[249,324,325],{},"Filtration, fluid cleanliness, wiper condition and environmental contamination should therefore be checked before rebuilding.",[244,327,329],{"id":328},"hard-cracked-or-brittle-material","Hard, Cracked or Brittle Material",[249,331,332],{},"A seal that has hardened, lost elasticity or cracked requires a review of the actual thermal and material environment.",[249,334,335],{},"Measure hydraulic-fluid temperature and, where relevant, the local cylinder temperature during normal operation.",[249,337,338],{},"Do not assign one universal temperature limit to all polyurethane, nitrile, fluorocarbon or other seal materials. Actual suitability depends on the specific compound formulation, fluid, pressure, motion and duty cycle.",[249,340,341],{},"External heat sources and repeated thermal cycling should also be considered.",[244,343,345],{"id":344},"swelling-shrinkage-or-gummy-material","Swelling, Shrinkage or Gummy Material",[249,347,348],{},"Seal swelling, shrinkage, stickiness or abnormal softening strongly suggests that material compatibility requires investigation.",[249,350,351],{},"The nominal hydraulic oil is only one possible exposure.",[249,353,354],{},"Dynamic seals can also contact:",[267,356,357,360,363,366,369,372],{},[270,358,359],{},"additives,",[270,361,362],{},"water-based fluids,",[270,364,365],{},"coolant,",[270,367,368],{},"cleaning chemicals,",[270,370,371],{},"process fluids,",[270,373,374],{},"and external contaminants carried onto the rod.",[249,376,377],{},"A material described as compatible in one sealing application should not automatically be assumed suitable for a different dynamic cylinder seal.",[249,379,380],{},"Verify the actual compound against every relevant fluid and operating temperature before selecting the replacement.",[244,382,384],{"id":383},"extrusion-and-feathered-edges","Extrusion and Feathered Edges",[249,386,387],{},"Extrusion appears when seal material is forced into a clearance or gap under pressure.",[249,389,390],{},"Feathered or flash-like edges therefore require more than a seal-material check.",[249,392,393],{},"Review:",[267,395,396,399,402,405,408,411],{},[270,397,398],{},"actual cylinder-port pressure,",[270,400,401],{},"gland and extrusion-gap geometry,",[270,403,404],{},"rod-bearing clearance,",[270,406,407],{},"backup elements,",[270,409,410],{},"seal installation,",[270,412,413],{},"and circuit conditions that can intensify pressure.",[249,415,416],{},"A restrictive return path or meter-out condition can create rod-side pressure higher than the nominal supply pressure in some cylinder circuits.",[249,418,419],{},"Installing a harder seal without correcting the pressure or gland condition can mask rather than solve the root cause.",[244,421,423],{"id":422},"inspect-the-components-around-the-seal","Inspect the Components Around the Seal",[249,425,426],{},"A failed seal should never be evaluated without its mating hardware.",[249,428,429],{},"During qualified disassembly inspect, as applicable:",[267,431,432,435,438,441,444,447,450,453,456],{},[270,433,434],{},"piston rod surface,",[270,436,437],{},"cylinder bore,",[270,439,440],{},"gland and rod bearing,",[270,442,443],{},"piston,",[270,445,446],{},"seal grooves,",[270,448,449],{},"backup rings,",[270,451,452],{},"wiper,",[270,454,455],{},"static seals,",[270,457,458],{},"and adjacent pressure-containing components.",[249,460,461],{},"A seal can be the first component to show damage even when the initiating problem is alignment, contamination, surface damage, pressure or material incompatibility.",[244,463,465],{"id":464},"failure-analysis-before-rebuild","Failure Analysis Before Rebuild",[249,467,468],{},"A seal kit is appropriate only after the failure mechanism has been identified and the associated cylinder components remain serviceable.",[249,470,471],{},"Correct the underlying problem before installing replacement seals.",[249,473,474],{},"Examples include:",[267,476,477,480,483,486,489,492,495],{},[270,478,479],{},"correcting cylinder and machine alignment,",[270,481,482],{},"repairing or replacing damaged rod or bore surfaces,",[270,484,485],{},"restoring fluid cleanliness,",[270,487,488],{},"selecting the correct seal compound,",[270,490,491],{},"correcting excessive operating temperature,",[270,493,494],{},"correcting pressure intensification,",[270,496,497],{},"and restoring gland, bearing or backup support.",[249,499,500],{},"If the cylinder contains structural damage, severe surface damage or geometry that cannot be restored and verified reliably, a broader rebuild or replacement review is more appropriate than another seal change.",{"title":11,"searchDepth":12,"depth":12,"links":502},[503,504,505,506,507,508,509,510],{"id":246,"depth":12,"text":247},{"id":293,"depth":12,"text":294},{"id":309,"depth":12,"text":310},{"id":328,"depth":12,"text":329},{"id":344,"depth":12,"text":345},{"id":383,"depth":12,"text":384},{"id":422,"depth":12,"text":423},{"id":464,"depth":12,"text":465},"Analyze hydraulic cylinder seal failure from the removed or inspected seal's wear pattern, scoring, hardness, swelling, shrinkage, extrusion and surrounding component condition.",[513,529,545,560,575],{"id":514,"label":515,"physicalEvidence":516,"possibleCauses":519,"recommendedActions":524},"one-sided-wear-pattern","Seal or Bearing Worn Mainly on One Side",[517,518],"Rod seal or bearing wear is concentrated on one side rather than evenly distributed.","Rod, bearing or adjacent surface may show corresponding one-sided contact, galling or abnormal wear.",[520,521,522,523],"Cylinder-to-load misalignment and side loading.","Bent or insufficiently stiff piston rod in a compression application.","Inadequate machine-load guidance.","Worn rod bearing or gland allowing excessive lateral movement.",[525,526,527,528],"Correct machine and cylinder alignment before fitting new seals.","Inspect rod straightness, rod-bearing or gland condition and mounting geometry.","Verify that the machine load is independently guided rather than using the cylinder rod as a guide.","Recheck rod size and column stability for long-stroke push service where applicable.",{"id":530,"label":531,"physicalEvidence":532,"possibleCauses":535,"recommendedActions":540},"scored-or-abraded-seal","Seal Is Scored, Cut or Abraded",[533,534],"Seal lips or dynamic sealing surfaces show scratches, cuts, abrasive tracks or localized damage.","Rod, bore, bearing or wiper may show corresponding scoring or contamination damage.",[536,537,538,539],"Contaminated hydraulic fluid.","External dirt or abrasive material entering past a damaged or unsuitable wiper.","Damaged rod or bore surface repeatedly cutting or abrading the seal.","Contamination introduced during assembly or service.",[541,542,543,544],"Identify and remove the contamination source before replacing the seal.","Inspect filtration, fluid cleanliness, wiper condition and rod protection.","Inspect the rod, bore and other mating surfaces for damage that could immediately damage a new seal.","Restore or replace damaged sealing surfaces according to the cylinder manufacturer's requirements.",{"id":546,"label":547,"physicalEvidence":548,"possibleCauses":551,"recommendedActions":555},"hard-cracked-or-brittle","Seal Is Hard, Cracked or Brittle",[549,550],"Seal material has lost elasticity or shows hardening, cracking or brittle fracture.","Damage is associated with elevated temperature, low-temperature cycling or long-term thermal exposure.",[552,553,554],"Seal compound is operating outside its suitable temperature range.","Hydraulic-fluid temperature or a nearby heat source is accelerating material degradation.","Seal material is unsuitable for the actual fluid and temperature combination.",[556,557,558,559],"Measure the actual fluid and local cylinder temperature under normal duty.","Verify the specific seal compound and hydraulic fluid combination against manufacturer data.","Review duty cycle and nearby external heat sources.","Correct the thermal or compatibility cause before installing replacement seals.",{"id":561,"label":562,"physicalEvidence":563,"possibleCauses":566,"recommendedActions":570},"swollen-shrunken-or-gummy","Seal Is Swollen, Shrunken, Sticky or Gummy",[564,565],"Seal dimensions, hardness or surface texture have changed from the intended condition.","Seal removal may be unusually difficult because of swelling, or the seal may fit loosely because of shrinkage.",[567,568,569],"Chemical incompatibility between the seal compound and hydraulic fluid.","Additives, coolant, cleaning chemicals or process fluids are contacting the dynamic sealing system.","A seal material suitable for one fluid or static application has been used in an unsuitable dynamic environment.",[571,572,573,574],"Identify every fluid and chemical that can contact the seal, not only the nominal hydraulic oil.","Verify dynamic-seal compatibility against seal and fluid manufacturer data.","Inspect associated wipers, backup rings and other elastomeric components for similar material changes.","Resolve the incompatible fluid or seal-material combination before rebuilding the cylinder.",{"id":576,"label":577,"physicalEvidence":578,"possibleCauses":581,"recommendedActions":586},"extrusion-or-feathered-edge","Seal Is Extruded, Feathered or Uniformly Overworn",[579,580],"Seal heel or lip shows flash-like extrusion, feathered edges or pressure-related deformation.","Damage may occur around a large portion of the seal rather than at one isolated contamination mark.",[582,583,584,585],"Excessive pressure at the sealing interface.","Pressure intensification caused by a restrictive return path or meter-out circuit condition.","Extrusion gap, gland geometry or seal design is unsuitable for the actual pressure and clearance condition.","Supporting hardware or backup elements are damaged or incorrectly installed.",[587,588,589,590],"Measure pressure at the relevant cylinder port during the fault condition using an approved test method.","Review return restrictions, valve configuration and potential pressure intensification.","Inspect gland dimensions, bearing clearance, backup elements and sealing hardware against manufacturer requirements.","Do not simply install a harder seal without verifying the pressure, gland and extrusion-gap requirements.",{"directAnswer":592,"keyFacts":593,"verificationNotes":598},"Hydraulic cylinder seal failure should be diagnosed from the damaged seal and the surfaces around it after the leak location or internal fault has been identified. One-sided wear points toward side loading, misalignment or bearing problems; scoring and cuts point toward contamination or damaged mating surfaces; hard or cracked material suggests thermal or material degradation; swelling, shrinkage or gummy material suggests chemical incompatibility; and extrusion or feathering indicates that pressure, clearance and gland support must be checked. Replacing the seal alone will not correct these underlying failure mechanisms.",[594,595,596,597],"Seal damage patterns are evidence of the operating condition that produced the failure, not just evidence that a seal needs replacement.","A new seal can fail rapidly if a damaged rod, bore, bearing, gland or contamination source remains in service.","Fluid compatibility must be evaluated for the actual seal compound, temperature and dynamic operating condition.","Pressure-related extrusion requires verification of port pressure, gland support and circuit conditions rather than automatic substitution of a harder seal.",[599,600],"Record seal position, orientation, wear pattern and adjacent component condition during qualified disassembly before cleaning or discarding failed parts.","Do not substitute seal materials solely by appearance, hardness or generic material name; verify compound, fluid, temperature, pressure, gland and application requirements.","published",{},"\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-seal-failure","seal-failure",[606,611],{"publisher":607,"title":608,"url":609,"sourceType":610},"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":607,"title":612,"url":613,"sourceType":610},"Cylinder Safety Guide — Cylinder Troubleshooting","https:\u002F\u002Fwww.parker.com\u002Fcontent\u002Fdam\u002FParker-com\u002FLiterature\u002FAtlas-Cylinder\u002FPDF\u002FAC0800-01-T1.pdf",[615,616,617],"tie-rod-hydraulic-cylinder","welded-hydraulic-cylinder","mill-type-hydraulic-cylinder",[619,622],{"label":620,"path":621},"Hydraulic Cylinder Leaking","\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-leaking\u002F",{"label":623,"path":624},"Hydraulic Cylinder Internal Leakage","\u002Fresources\u002Ftroubleshooting\u002Fhydraulic-cylinder-internal-leakage\u002F",[],[627],{"label":195,"path":196},{"title":629,"description":630,"noindex":631},"Hydraulic Cylinder Seal Failure: Causes & Troubleshooting | BOETH","Diagnose hydraulic cylinder seal failure from wear, scoring, hardening, swelling, shrinkage and extrusion to identify likely root causes.",false,"hydraulic-cylinder-seal-failure","resources\u002Ftroubleshooting\u002Fhydraulic-cylinder-seal-failure","UaUZwgPeYCoUSEWVHT9-QmcbS5jKIBoB5gexD6QIhp4",1792667602249]