[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-502495-105":59,"doc-detail-502495-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","cmaa-crane-duty-classifications","CMAA Crane Duty Classifications","","CMAA Crane Duty Classifications define how crane service duty is categorized across six classes, from standby or infrequent use to continuous severe service. Each class description clarifies the typical operating pattern, including expected lift frequency per hour, average lift height, load behavior relative to rated capacity, and the kinds of facilities where the crane is typically applied. The document also highlights when high speeds are desirable and when cranes must sustain near-rated loads throughout their service life.",{"@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/cmaa-crane-duty-classifications/502495/",{"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/cmaa-crane-duty-classifications/502495.png","ImageObject",300,407,{"name":92,"@type":93},"Jake","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-16","2026-10-03",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What distinguishes Class A from other crane duty classes?","Question",{"text":112,"@type":113},"Class A covers standby or infrequent service, typically used for installation and maintenance cranes operating slowly with long idle periods between lifts.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does Class C define typical crane loading and lift frequency?",{"text":117,"@type":113},"Class C involves handling loads averaging about 50% of rated capacity with roughly 5 to 10 lifts per hour and an average lift height around 15 feet.",{"name":119,"@type":110,"acceptedAnswer":120},"What requirements characterize Class F continuous severe service cranes?",{"text":121,"@type":113},"Class F is reserved for top riding bridge and gantry type multiple girder electric overhead traveling cranes, requiring high reliability and near-rated load handling throughout the crane’s life with special attention to maintenance ease.","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},502495,1791614311,{"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":39,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":8,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":81},962084928904,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","| CMAA Crane Duty Classifications |  |  |  |  |\n| --- | --- | --- | --- | --- |\n| CMAA Class | Description | Further Explanation |  |  |\n| Class A | Standby or Infrequent Service |  | This class normally includes installation and maintenance cranes. This equipment usually operates at slow speeds for precise handling with long idle periods between lifts. Maximum capacity lifts are sometimes required. |  |\n| Class B | Light Service | This class of crane is used in repair shops, light assembly operations, service buildings, light warehousing, etc. Service requirement is light and speeds are slow. Loads vary from none to occasional full capacity. Lifts per hour would range from 2 to 5, and average 10 feet per lift. |  |  |\n| Class C | Moderate Service | In terms of numbers, most cranes are built to meet Class C service requirements. This service covers cranes that may be used in machine shops or paper mill machine rooms. In this type of service, the crane will handle loads that average 50% of the rated capacity with 5 to 10 lifts per hour averaging 15 feet. Not over 50% of the loads at rated capacity. |  |  |\n| Class D | Heavy Service |  | This service covers cranes which may be used in heavy machine shops, foundries, fabricating plants, steel warehouses, container yards, lumber mills, etc. , and standard duty bucket and magnet operations where heavy duty production is required. In this type of service, loads approaching 50 percent of the rated capacity will be handled constantly during the working period. High speeds are desirable for this type of service with 10 to 20 lifts per hour averaging 15 feet, not over 65 percent of the lifts at rated capacity. |  |\n| Class E | Severe Service |  | This type of service is reserved for top riding bridge and gantry type multiple girder electric overhead travelling cranes and requires a crane capable of handling loads approaching rated capacity throughout its life. Applications may include magnet, bucket, magnet/bucket combination cranes for scrap yards, cement mills, lumber mills, fertilizer plants, container handling , etc. with 20 or more lifts per hour at or near the rated capacity. |  |\n| Class F | Continuous Severe Service | This type of service is reserved for top riding bridge and gantry type multiple girder electric overhead travelling cranes and requires a crane capable of handling loads approaching rated capacity throughout its life. Applications may include custom designed specialty cranes essential to performing the critical work tasks affecting the total production facility. These cranes must provide the highest reliability, with special attention to ease of maintenance features. |  |  |","cbCaidMfWmCJYhKI","https://ap.wps.com/l/cbCaidMfWmCJYhKI","pdf",41373,"English","# CMAA Crane Duty Class Class A\n## Standby or Infrequent Service\n# CMAA Crane Duty Class Class B\n## Light Service\n# CMAA Crane Duty Class Class C\n## Moderate Service\n# CMAA Crane Duty Class Class D\n## Heavy Service\n# CMAA Crane Duty Class Class E\n## Severe Service\n# CMAA Crane Duty Class Class F\n## Continuous Severe Service","[{\"question\":\"What distinguishes Class A from other crane duty classes?\",\"answer\":\"Class A covers standby or infrequent service, typically used for installation and maintenance cranes operating slowly with long idle periods between lifts.\"},{\"question\":\"How does Class C define typical crane loading and lift frequency?\",\"answer\":\"Class C involves handling loads averaging about 50% of rated capacity with roughly 5 to 10 lifts per hour and an average lift height around 15 feet.\"},{\"question\":\"What requirements characterize Class F continuous severe service cranes?\",\"answer\":\"Class F is reserved for top riding bridge and gantry type multiple girder electric overhead traveling cranes, requiring high reliability and near-rated load handling throughout the crane’s life with special attention to maintenance ease.\"}]","CMAA Crane Duty Classifications | PDF",1791035179]