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Covers circuit diagram types, the purpose of reading schematics for diagnosis and repair, and practical interpretation of symbol systems. Includes detailed explanations of reservoirs, suction/return lines, lines, tubes, and hoses, including flow direction, control and drain line styles, and connection conventions, preparing readers to understand pumps and other mechanical devices.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/how-to-read-symbols-in-a-hydraulic-schematic/669052/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/how-to-read-symbols-in-a-hydraulic-schematic/669052.png","ImageObject",300,407,{"name":92,"@type":93},"SANS","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-03","2026-11-01",true,{"@type":102,"interactionType":103,"userInteractionCount":14},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why are accurate hydraulic circuit diagrams essential?","Question",{"text":112,"@type":113},"Accurate diagrams show how components interact, where oil should flow, and what each component should do, enabling technicians to diagnose and repair the system.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What is the purpose of the section on reading symbols?",{"text":117,"@type":113},"It explains how to navigate schematic circuit diagrams by learning how to interpret the symbols used for hydraulic components.",{"name":119,"@type":110,"acceptedAnswer":120},"How do schematic diagrams typically represent working lines and flow direction?",{"text":121,"@type":113},"Working lines such as inlet pressure or return are solid lines, and arrows on them indicate the direction of flow.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},669052,1793524705,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":14,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},962090760505,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Section  \n8000  \n# How to Read Symbols in a Hydraulic Schematic\n\n8000  \n## TABLE OF CONTENTS\n\nHOW TO READ SYMBOLS INA HYDRAULIC SCHEMATIC  \nIntroductionCircuit DiagramsSymbol SystemsUsing Schematic Symbols  \nReservoirs  \nLines,Tubes and HosesCrossing or Joining LinesPump SymbolsHydraulic Motor SymbolsCylinder Symbols  \nPressure Control SymbolsNormally ClosedNormally OpenRelief Valve  \nPressure Reducing ValveSequence Valve  \nDirectional Control SymbolsSimplified SymbolsOne Way ValveBy Pass Valve  \nComposite Symbols  \nOne Way Valves  \nTwo Position Valves  \nThree Position Valves  \nActuating Controls  \nFlow Control Symbols  \nRestrictors  \nAccessories  \n## NOTES\n\nSIMPLE SCHEMATIC  \nCOMMON SYMBOLS  \nLines and Line FunctionsMechanical DevicesPumps and MotorsReservoirsCylindersValvesValve ActuatorsAccessories  \nNOTE:Case Corporation reserves the right to make improvements in design or changes inspecifications at any time without incurring any obligation to install them on units previouslysold  \n3  \n3  \n3  \n3  \n3  \n3  \n4  \n5  \n5  \n6  \n6  \n7  \n7  \n8  \n8  \n8  \n8  \n8  \n9  \n9  \n9  \n7  \n7  \n7  \n8  \n8  \n8  \n9  \n10  \n11  \n12  \n14  \n14  \n14  \n14  \n15  \n15  \n15  \n17  \n17  \n1 Cutaway Circuit Diagrams show the internal constructionof the components as well as the flow paths By usingcolors,shades or various patterns in the lines andpassages,they are able to show many differentconditions of flow and pressure Cutaway diagrams takeconsiderably longer to produce because of theircomplexity  \n2 Schematic Circuit Diagrams the“shorthand”system ofthe industry,are usually preferred for troubleshooting Aschematic diagram is made up of simple geometricsymbols for the components and their controls andconnections  \n## Symbol Systems\n\nThere are several systems of symbols used when makingschematic diagrams They are as follows  \nISO=International Standards OrganizationA N SI=American National Standards InstituteA S A=American Standards AssociationJ IC=Joint Industry Conference  \nA combination of these symbols are shown in this sectionThere are differences between the symbols but there isenough similarity so that if you understand the symbols in thissection you willbe able to interpret other symbols as well  \n## Introduction\n\nAccurate diagrams of hydraulic circuits are essential to theman who must repair them The diagram shows how thecomponents willinteract It shows the field technician how itworks,what each component should be doing and where theoil should be going so that he can diagnose and repair thesystem  \nThe purpose of this section is to show you how to find yourway around schematic circuit diagrams  \n## Circuit Diagrams\n\nThere are two types of circuit diagrams  \nHOW TO READ SYMBOLS INA HYDRAULIC SCHEMATIC  \n## Using Schematic Symbols\n\nReservoirs  \nVENTED RESERVOIR  \nPRESSURIZED RESERVOIR  \n710L8B  \n710L8D  \nA rectangle with the top removed represents a ventedreservoir A rectangle with the top in place represents apressurized reservoir  \nPRESSURIZED RESERVOIR  \nPRESSURIZED RESERVOIR  \n710L8C  \n710L8A  \nThere are other schematic diagrams that show a slightlydifferent version of a pressurized reservoir,but the symbolsare similar and easily recognized An oval with a short line ontop or a rectangle with curved sides represents a reservoirthat is pressurized  \nRETURN LINE ABOVE  \nTHE OIL LEVEL  \n710L8E  \nLines connected to the reservoir usually are drawn from thetop,regardless of where the actual connection is  \n## SUCTION LINE OR RETURN LINEBELOW THE OIL LEVEL\n\n710L8F  \nIf the hydraulic line terminates below the fluid level,it isdrawn all the way to the bottom of the symbol  \nRESERVOIR WITH SUCTION LINE ATTACHED AT THE BOTTOM7108G  \nA hydraulic line connected to the bottom of the reservoir maybe drawn from the bottom of the symbol if the bottomconnection is essential to the systems operation  \n749L8B  \nIf the pump inlet must be charged or flooded with a positivehead of oil above the inlet port,we would position thereservoir symbol above the pump symbol,and draw","cbCaihXvE0pfKwPD","https://ap.wps.com/l/cbCaihXvE0pfKwPD","pdf",987643,17,"English","# TABLE OF CONTENTS\n## NOTES\n## Symbol Systems\n## Introduction\n## Circuit Diagrams\n## Using Schematic Symbols\n### Reservoirs\n### Lines, Tubes and Hoses\n### Pump Symbols\n### Hydraulic Motor Symbols\n### Cylinder Symbols\n### Pressure Control Symbols\n### Directional Control Symbols\n### Flow Control Symbols\n### Accessories","[{\"question\":\"Why are accurate hydraulic circuit diagrams essential?\",\"answer\":\"Accurate diagrams show how components interact, where oil should flow, and what each component should do, enabling technicians to diagnose and repair the system.\"},{\"question\":\"What is the purpose of the section on reading symbols?\",\"answer\":\"It explains how to navigate schematic circuit diagrams by learning how to interpret the symbols used for hydraulic components.\"},{\"question\":\"How do schematic diagrams typically represent working lines and flow direction?\",\"answer\":\"Working lines such as inlet pressure or return are solid lines, and arrows on them indicate the direction of flow.\"}]","How to Read Symbols in a Hydraulic Schematic | PDF",43]