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<span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliography" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bibliography"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Bibliography</span> </div> </a> <ul id="toc-Bibliography-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div 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class="mw-page-title-main">Power take-off</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. 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href="https://cs.wikipedia.org/wiki/Pomocn%C3%BD_pohon_(PTO)" title="Pomocný pohon (PTO) – Czech" lang="cs" hreflang="cs" data-title="Pomocný pohon (PTO)" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Kraftudtag" title="Kraftudtag – Danish" lang="da" hreflang="da" data-title="Kraftudtag" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Nebenabtrieb" title="Nebenabtrieb – German" lang="de" hreflang="de" data-title="Nebenabtrieb" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Fortotransdon%C5%9Dafto" title="Fortotransdonŝafto – Esperanto" lang="eo" hreflang="eo" data-title="Fortotransdonŝafto" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%85%D8%AD%D9%88%D8%B1_%D8%AA%D9%88%D8%A7%D9%86%E2%80%8C%D8%AF%D9%87%DB%8C" title="محور توان‌دهی – Persian" lang="fa" hreflang="fa" data-title="محور توان‌دهی" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Prise_de_force" title="Prise de force – French" lang="fr" hreflang="fr" data-title="Prise de force" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ig mw-list-item"><a href="https://ig.wikipedia.org/wiki/%E1%BB%8Cganihu_ike" title="Ọganihu ike – Igbo" lang="ig" hreflang="ig" data-title="Ọganihu ike" data-language-autonym="Igbo" data-language-local-name="Igbo" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Presa_di_potenza" title="Presa di potenza – Italian" lang="it" hreflang="it" data-title="Presa di potenza" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D1%80%D0%B8%D0%BA%D0%BB%D1%83%D1%87%D0%BD%D0%BE_%D0%B2%D1%80%D0%B0%D1%82%D0%B8%D0%BB%D0%BE" title="Приклучно вратило – Macedonian" lang="mk" hreflang="mk" data-title="Приклучно вратило" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Power_take-off" title="Power take-off – Dutch" lang="nl" hreflang="nl" data-title="Power take-off" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%91%E3%83%AF%E3%83%BC%E3%83%86%E3%82%A4%E3%82%AF%E3%82%AA%E3%83%95" title="パワーテイクオフ – Japanese" lang="ja" hreflang="ja" data-title="パワーテイクオフ" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Kraftuttak" title="Kraftuttak – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Kraftuttak" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Wa%C5%82_odbioru_mocy" title="Wał odbioru mocy – Polish" lang="pl" hreflang="pl" data-title="Wał odbioru mocy" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Tomada_de_for%C3%A7a" title="Tomada de força – Portuguese" lang="pt" hreflang="pt" data-title="Tomada de força" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%92%D0%B0%D0%BB_%D0%BE%D1%82%D0%B1%D0%BE%D1%80%D0%B0_%D0%BC%D0%BE%D1%89%D0%BD%D0%BE%D1%81%D1%82%D0%B8" title="Вал отбора мощности – Russian" lang="ru" hreflang="ru" data-title="Вал отбора мощности" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Odvzem_mo%C4%8Di" title="Odvzem moči – Slovenian" lang="sl" hreflang="sl" data-title="Odvzem moči" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9F%D1%80%D0%B8%D0%BA%D1%99%D1%83%D1%87%D0%BD%D0%BE_%D0%B2%D1%80%D0%B0%D1%82%D0%B8%D0%BB%D0%BE" title="Прикључно вратило – Serbian" lang="sr" hreflang="sr" data-title="Прикључно вратило" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Kraftuttag" title="Kraftuttag – Swedish" lang="sv" hreflang="sv" data-title="Kraftuttag" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%92%D0%B0%D0%BB_%D0%B2%D1%96%D0%B4%D0%B1%D0%BE%D1%80%D1%83_%D0%BF%D0%BE%D1%82%D1%83%D0%B6%D0%BD%D0%BE%D1%81%D1%82%D1%96" title="Вал відбору потужності – Ukrainian" lang="uk" hreflang="uk" data-title="Вал відбору потужності" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span 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class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Methods for transmitting power from a source to an application</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg/220px-Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg" decoding="async" width="220" height="159" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg/330px-Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/87/Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg/440px-Zapfwelle_eines_Traktors_-_power_take-off_of_a_tractor.jpg 2x" data-file-width="1600" data-file-height="1155" /></a><figcaption>A PTO at the rear end of a farm <a href="/wiki/Tractor" title="Tractor">tractor</a></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:A_Tractor%27s_rear.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/A_Tractor%27s_rear.jpg/220px-A_Tractor%27s_rear.jpg" decoding="async" width="220" height="146" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/96/A_Tractor%27s_rear.jpg/330px-A_Tractor%27s_rear.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/96/A_Tractor%27s_rear.jpg/440px-A_Tractor%27s_rear.jpg 2x" data-file-width="3008" data-file-height="2000" /></a><figcaption>A PTO (in the box at the bottom) in the center of the <a href="/wiki/Three-point_hitch" title="Three-point hitch">three-point hitch</a> of a tractor</figcaption></figure> <p>A <b>power take-off</b> or <b>power takeoff</b> (<b>PTO</b>) is one of several methods for taking power from a power source, such as a running <a href="/wiki/Engine" title="Engine">engine</a>, and <a href="/wiki/Power_transmission#Mechanical_power" title="Power transmission">transmitting</a> it to an application such as an attached implement or separate machine. </p><p>Most commonly, it is a <a href="/wiki/Spline_(mechanical)" title="Spline (mechanical)">splined</a> <a href="/wiki/Drive_shaft" title="Drive shaft">drive shaft</a> installed on a <a href="/wiki/Tractor" title="Tractor">tractor</a> or <a href="/wiki/Truck" title="Truck">truck</a> allowing implements with mating fittings to be powered directly by the engine. </p><p>Semi-permanently mounted power take-offs can also be found on industrial and marine engines. These applications typically use a drive shaft and <a href="/wiki/Bolted_joint" title="Bolted joint">bolted joint</a> to transmit power to a secondary implement or accessory. In the case of a marine application, such as shafts may be used to power fire pumps. </p><p>In <a href="/wiki/Aircraft" title="Aircraft">aircraft</a> applications, such an <a href="/wiki/Accessory_drive" title="Accessory drive">accessory drive</a> may be used in conjunction with a <a href="/wiki/Constant_speed_drive" title="Constant speed drive">constant speed drive</a>. Jet aircraft have four types of PTO units: internal gearbox, external gearbox, radial drive shaft, and bleed air, which are used to power engine accessories. In some cases, aircraft power take-off systems also provide for putting power <i>into</i> the engine during engine start.<sup id="cite_ref-X29PTO_1-0" class="reference"><a href="#cite_note-X29PTO-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> See also <a href="/wiki/Coffman_starter" class="mw-redirect" title="Coffman starter">Coffman starter</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:International_Harvester_Cub_Tractor_(1963).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/International_Harvester_Cub_Tractor_%281963%29.jpg/220px-International_Harvester_Cub_Tractor_%281963%29.jpg" decoding="async" width="220" height="138" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/International_Harvester_Cub_Tractor_%281963%29.jpg/330px-International_Harvester_Cub_Tractor_%281963%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/International_Harvester_Cub_Tractor_%281963%29.jpg/440px-International_Harvester_Cub_Tractor_%281963%29.jpg 2x" data-file-width="3918" data-file-height="2458" /></a><figcaption>Yellow shaft provides PTO drive to a <a href="/wiki/Flail_mower" title="Flail mower">flail mower</a> on this <a href="/wiki/International_Harvester" title="International Harvester">International Harvester</a> tractor</figcaption></figure> <p>Various power transmission methods were available before power take-offs became common, but there were applications which would benefit more from some of the attributes that PTOs would provide. <a href="/wiki/Belt_(mechanical)#Flat_belts" title="Belt (mechanical)">Flat belts</a> were generally only useful for applications where the engine was stationary, such as factory <a href="/wiki/Steam_engine" title="Steam engine">steam engines</a>, <a href="/wiki/Portable_engine" title="Portable engine">portable stationary engines</a>, or <a href="/wiki/Traction_engine" title="Traction engine">traction engines</a> parked in front of the work. For moving vehicles such as a <a href="/wiki/Traction_engine" title="Traction engine">traction engine</a> or early <a href="/wiki/Tractor" title="Tractor">tractor</a> towing a <a href="/wiki/List_of_agricultural_machinery" title="List of agricultural machinery">farm implement</a>, the implement could receive rotary power by taking it from one of its own wheels (whose turning was imparted by the towing) and distributing it via roller chains (to a <a href="/wiki/Mower#Sickle_mower" title="Mower">sickle bar</a>'s crank, for example), but such a transmission ceases if the vehicle stops traveling, and the workload's resistance tends to make the wheel skid rather than turn, even if <a href="/wiki/Grouser" title="Grouser">cleated</a>. The concept of a shaft drive with easily connected and disconnected couplings, and flexibility for driving at changing angles (such as when an articulated tractor-and-trailer combination turns), was a goal to pursue. </p><p>Experimental power take-offs were tried as early as 1878, and various homemade versions were constructed over the subsequent decades.<sup id="cite_ref-Spinning_2-0" class="reference"><a href="#cite_note-Spinning-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>  <a href="/wiki/International_Harvester" title="International Harvester">International Harvester</a> Company (IHC) was first to market with a PTO on a production tractor, with its model 8-16, introduced in 1918.<sup id="cite_ref-PrippsMorland1993pp37-39_3-0" class="reference"><a href="#cite_note-PrippsMorland1993pp37-39-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Edward A. Johnston, an IHC engineer, had been impressed by a homemade PTO that he saw in France about a decade before, improvised by a French farmer and mechanic surnamed Gougis.<sup id="cite_ref-PrippsMorland1993pp37-39_3-1" class="reference"><a href="#cite_note-PrippsMorland1993pp37-39-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> He and his IHC colleagues incorporated the idea into the 8-16, and designed a family of implements to take advantage of the feature. IHC was not alone in the market for long, as within a year PTOs were appearing on other production tractors, such as some <a href="/wiki/Case_Corporation" title="Case Corporation">Case</a> models. In 1920, IHC offered the PTO option on their 15-30 tractor, and it was the first PTO-equipped tractor to be submitted for a <a href="/wiki/Tractor#Nebraska_tractor_tests" title="Tractor">Nebraska tractor test</a>. The PTO was a competitive advantage for IHC in the 1920s, and other companies eventually caught up with PTO implementation. </p><p>Inside the <a href="/wiki/Transmission_(mechanics)" class="mw-redirect" title="Transmission (mechanics)">transmission</a>, the exact point along the <a href="/wiki/Gear_train" title="Gear train">gear train</a> where the power is taken off determines whether the PTO can be run independently of vehicle travel (<a href="/wiki/Ground_speed" title="Ground speed">ground speed</a>). Early PTOs were often taken off the main output shaft, meaning that the vehicle had to be "in gear" in order to run the PTO. Later this was improved by so-called live PTO (LPTO) designs, which allow control of the PTO rotation independently of the tractor motion. This is an advantage when the load driven by the PTO requires the tractor motion to slow or stop running to allow the PTO driven equipment to catch up. It also allows operations where the tractor remains parked, such as silo-filling or unloading a <a href="/wiki/Manure_spreader" title="Manure spreader">manure spreader</a> to a pile or lagoon rather than across a field. In 1945, <a href="/wiki/Cockshutt_Plow_Company" title="Cockshutt Plow Company">Cockshutt Farm Equipment Ltd</a> of <a href="/wiki/Brantford" title="Brantford">Brantford</a>, Ontario, Canada, introduced the Cockshutt Model 30 tractor with LPTO. Live PTOs eventually became a widespread norm for new equipment; in modern tractors, LPTO is often controlled by push-button or selector switch. This increases safety of operators who need to get close to the PTO shaft. </p> <div class="mw-heading mw-heading2"><h2 id="Safety">Safety</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=2" title="Edit section: Safety"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:TractorPTOshaftMay04.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/TractorPTOshaftMay04.jpg/220px-TractorPTOshaftMay04.jpg" decoding="async" width="220" height="152" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/18/TractorPTOshaftMay04.jpg/330px-TractorPTOshaftMay04.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/18/TractorPTOshaftMay04.jpg/440px-TractorPTOshaftMay04.jpg 2x" data-file-width="480" data-file-height="331" /></a><figcaption>Protective plastic sheath enshrouding a PTO shaft</figcaption></figure> <p>The PTO, as well as its associated shafts and <a href="/wiki/Universal_joint" title="Universal joint">universal joints</a>, are a common cause of incidents and injury in farming and industry. According to the <a href="/wiki/National_Safety_Council" title="National Safety Council">National Safety Council</a>, six percent of tractor related fatalities in 1997 in the United States involved the PTO. Incidents can occur when loose clothing is pulled into the shaft, often resulting in <a href="/wiki/Bone_fracture" title="Bone fracture">bone fractures</a>, <a href="/wiki/Amputation" title="Amputation">loss of limbs</a>, other permanent disabilities, or death to its wearer. On April 13, 2009, former <a href="/wiki/Major_League_Baseball" title="Major League Baseball">Major League Baseball</a> star <a href="/wiki/Mark_Fidrych" title="Mark Fidrych">Mark Fidrych</a> <a href="/wiki/Mark_Fidrych#Death" title="Mark Fidrych">died as a result of a PTO related accident</a>; "He appeared to have been working on his truck when his clothes became tangled in the truck's power take-off shaft", District Attorney Joseph Early Jr. said in a statement.<sup id="cite_ref-espn-fidrych_4-0" class="reference"><a href="#cite_note-espn-fidrych-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Despite much work to reduce the frequency and severity of agricultural injuries, these events still occur.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Some implements employ light free-spinning protective plastic guards to enshroud the PTO shaft;<sup id="cite_ref-NSC_6-0" class="reference"><a href="#cite_note-NSC-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Privette_7-0" class="reference"><a href="#cite_note-Privette-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> these are mandatory in some countries. <sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="There were 2 Citations at end of sentence. Work in neither citation mentioned mandate for PTO guards. (July 2022)">citation needed</span></a></i>]</sup> In the UK, <a href="/wiki/Health_and_Safety_Executive" title="Health and Safety Executive">Health and Safety Executive</a> guidance is contained in a leaflet.<sup id="cite_ref-AIS40_8-0" class="reference"><a href="#cite_note-AIS40-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Technical_standardization">Technical standardization</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=3" title="Edit section: Technical standardization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Agricultural PTOs are <a href="/wiki/Standardization" title="Standardization">standardized</a> in dimensions and speed. The <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a> standard for PTOs is <i>ISO 500</i>,<sup id="cite_ref-iso_9-0" class="reference"><a href="#cite_note-iso-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> which as of the 2004 edition was split into three parts: </p> <ol><li><i>ISO 500-1</i> General specifications, safety requirements, dimensions for master shield and clearance zone</li> <li><i>ISO 500-2</i> Narrow-track tractors, dimensions for master shield and clearance zone</li> <li><i>ISO 500-3</i> Main PTO dimensions and spline dimensions, location of PTO.</li></ol> <p>The original type (designated as Type 1) calls for operation at 540 <a href="/wiki/Revolutions_per_minute" title="Revolutions per minute">revolutions per minute</a> (rpm). A shaft that rotates at 540 rpm has six splines on it, and a diameter of <style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac">1<span class="sr-only">+</span><span class="num">3</span>⁄<span class="den">8</span></span> inches (35 mm).<sup id="cite_ref-agproud_10-0" class="reference"><a href="#cite_note-agproud-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>Two newer types, supporting higher power applications, operate at 1000 rpm and differ in shaft size.<sup id="cite_ref-agproud_10-1" class="reference"><a href="#cite_note-agproud-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Farmers typically differentiate these two types by calling them "large 1000" or "small 1000" as compared to the Type 1 which is commonly referred to as the "540". All new types (2, 3, and 4) use <a href="/wiki/Involute" title="Involute">involute</a> splines, whereas Type 1 uses straight splines.<sup id="cite_ref-iso_9-1" class="reference"><a href="#cite_note-iso-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>Inch-denominated shafts are round, rectangular, square, or splined; metric shafts are star, bell, or <a href="/wiki/American_football" title="American football">football</a>-shaped.<sup id="cite_ref-tulsa_11-0" class="reference"><a href="#cite_note-tulsa-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable sortable"> <tbody><tr> <th>Type </th> <th>RPM </th> <th>Diameter </th> <th>Splines </th></tr> <tr> <td>1 </td> <td>540 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">3</span>⁄<span class="den">8</span></span> in or 35 mm </td> <td>6 straight </td></tr> <tr> <td>2 </td> <td>1,000 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">3</span>⁄<span class="den">8</span></span> in or 35 mm </td> <td>21 involute </td></tr> <tr> <td>3 </td> <td>1,000 </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac">1<span class="sr-only">+</span><span class="num">3</span>⁄<span class="den">4</span></span> in or 44 mm </td> <td>20 involute </td></tr> <tr> <td>4 </td> <td>1,300 </td> <td>57.5 millimetres (2.26 in) </td> <td>22 involute </td></tr></tbody></table><p><sup id="cite_ref-agproud_10-2" class="reference"><a href="#cite_note-agproud-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-iso_9-2" class="reference"><a href="#cite_note-iso-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>Due to ever-increasing horsepower requirements from farm implements, and higher horsepower engines being installed in farm tractors, a still larger type (designated as Type 4) has been added to ISO 500. It operates at a higher rotational speed of 1300 rpm in order to allow for power transfer at reduced levels of torque. The shaft has 22 splines with a major diameter of 57.5 <a href="/wiki/Millimeters" class="mw-redirect" title="Millimeters">millimeters</a> (mm). It is meant to handle PTO powers up to 450 <a href="/wiki/Kilowatts" class="mw-redirect" title="Kilowatts">kilowatts</a> (kW), or roughly 600 <a href="/wiki/Horsepower" title="Horsepower">horsepower</a> (hp). </p><p>All four types rotate counterclockwise when viewed looking back from inside the tractor's cab; when standing behind the tractor and looking directly at the shaft, it turns clockwise.<sup id="cite_ref-agproud_10-3" class="reference"><a href="#cite_note-agproud-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>A 10-spline type was used with some early equipment such as the 1948 <a href="/wiki/Land_Rover" title="Land Rover">Land Rover</a>. A six-spline adapter was usually supplied. It is customary for agricultural machines manufacturers to provide the nominal PTO power specification, an indication of the available instantaneous power at the shaft. Newer tractors may come equipped with 540/540E and/or 1000/1000E options that allow the tractor to power certain low-power-demand implements like <a href="/wiki/Hay_rake" title="Hay rake">hay rakes</a> or <a href="/wiki/Tedder_(machine)" title="Tedder (machine)">tedders</a> using lower engine speeds to maintain the revolutions per minute needed, using less fuel and placing less stress on the engine – thereby improving efficiency and reducing costs. </p><p>The first industry <a href="/wiki/Technical_standard" title="Technical standard">standard</a> for PTO design was adopted by ASAE (the <a href="/wiki/American_Society_of_Agricultural_and_Biological_Engineers" title="American Society of Agricultural and Biological Engineers">American Society of Agricultural Engineers</a>) in April 1927. The PTO rotational speed was specified as 536 ± 10 rpm; the direction was clockwise. The speed was later changed to 540 rpm.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Use_on_commercial_vehicles">Use on commercial vehicles</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=4" title="Edit section: Use on commercial vehicles"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:PTO_gearbox.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/40/PTO_gearbox.JPG/220px-PTO_gearbox.JPG" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/40/PTO_gearbox.JPG/330px-PTO_gearbox.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/40/PTO_gearbox.JPG/440px-PTO_gearbox.JPG 2x" data-file-width="2032" data-file-height="1524" /></a><figcaption>A hydraulic PTO mounted on a truck gearbox</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Unimog-1980-05.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Unimog-1980-05.jpg/220px-Unimog-1980-05.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Unimog-1980-05.jpg/330px-Unimog-1980-05.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8f/Unimog-1980-05.jpg/440px-Unimog-1980-05.jpg 2x" data-file-width="2400" data-file-height="1600" /></a><figcaption>Rear crossbar with PTO hydraulic connectors and coupling on a <a href="/wiki/Unimog" title="Unimog">Unimog</a> 421</figcaption></figure> <p><a href="/wiki/Truck_transmissions" class="mw-redirect" title="Truck transmissions">Truck transmissions</a> have one or more locations which allow for a PTO to be mounted. The PTO must be purchased separately and care is required to match the physical interface of the transmission with a compatible PTO. PTO suppliers will usually require details of the make, model and even serial number of the transmission. Care is also needed to ensure that the physical space around the transmission allows for installation of the PTO. The PTO is engaged and disengaged using the main transmission clutch and a remote control mechanism which operates on the PTO itself. Typically, an air valve is used to engage the PTO, but a mechanical linkage, electric or hydraulic mechanism are also options. </p><p>Most <a href="/wiki/Unimog" title="Unimog">Unimogs</a> come with front and/or rear PTOs and hydraulics as well as three point hitch systems. </p><p>Units will be rated according to the continuous and intermittent torque that can be applied through them and different models will offer different "PTO shaft rotation to engine RPM" ratios. </p><p>In the majority of cases, the PTO will connect directly to a <a href="/wiki/Hydraulic_pump" title="Hydraulic pump">hydraulic pump</a>. This allows for transmission of mechanical force through the <a href="/wiki/Hydraulic_fluid" title="Hydraulic fluid">hydraulic fluid</a> system to any location around the vehicle where a hydraulic motor will convert it back into rotary or linear mechanical force. Typical applications include: </p> <ul><li>Running a water pump on a fire engine or water truck</li> <li>Running a truck mounted hot water extraction machine for carpet cleaning (driving vacuum blower and high-pressure solution pumps)</li> <li>Powering a blower system used to move dry materials such as cement</li> <li>Powering a vehicle-integrated air compressor system<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup></li> <li>Raising a dump truck bed</li> <li>Operating the mechanical arm on a bucket truck used by electrical maintenance personnel or cable TV maintenance crews</li> <li>Operating a winch on a tow truck</li> <li>Operating the compactor on a garbage truck</li> <li>Operating a Boom/Grapple truck</li> <li>Operating a truck mounted <a href="/wiki/Tree_spade" title="Tree spade">tree spade</a> and lift-mast assembly</li></ul> <div class="mw-heading mw-heading3"><h3 id="Split_shaft">Split shaft</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=5" title="Edit section: Split shaft"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A split shaft PTO is mounted to the truck's drive shaft to provide power to the PTO. Such a unit is an additional gearbox that separates the vehicle's drive shaft into two parts: </p> <ul><li>The gearbox-facing shaft which will transmit the power of the engine to the split shaft PTO;</li> <li>The axle-facing shaft which transmit the propelling power to the axle.</li></ul> <p>The unit itself is designed to independently divert the engine's power to either the axle-facing shaft or the additional PTO output shaft. This is done by two independent clutches like tooth or dog clutches, which can be operated at total <a href="/wiki/Driveline" class="mw-redirect" title="Driveline">driveline</a> standstill only. Because the main gearbox changes the rotation speed by selection of a gear, the PTO cannot be operated while the vehicle is moving. </p><p>On 4x4 vehicles, only the rear drive shaft is used by the split shaft PTO gearbox, requiring the vehicle's 4x4 drive scheme to be of the <i>selectable 4WD</i> type to keep the front axle drive shaft completely decoupled during PTO operation. </p><p>It is also possible to connect something other than a hydraulic pump directly to the PTO: for example, fire truck pumps. </p> <div class="mw-heading mw-heading3"><h3 id=""Sandwich"_split_shaft"><span id=".22Sandwich.22_split_shaft"></span>"Sandwich" split shaft</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=6" title="Edit section: "Sandwich" split shaft"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A "sandwich" type split shaft unit is mounted between engine and transmission and used on road maintenance vehicles, fire fighting vehicles and off-road vehicles. This unit gets the drive directly from the engine shaft and can be capable of delivering up to the complete engine power to the PTO. Usually these units come with their own lubricating system. Due to the sandwich mounting style, the gearbox will be moved away from the engine, requiring the driveline to accommodate the installation. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Agricultural_machinery" title="Agricultural machinery">Agricultural machinery</a></li> <li><a href="/wiki/Tractor" title="Tractor">Tractor</a></li> <li><a href="/wiki/Two-wheel_tractor" title="Two-wheel tractor">Two-wheel tractor</a></li> <li><a href="/wiki/V2L" class="mw-redirect" title="V2L">V2L</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=8" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-X29PTO-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-X29PTO_1-0">^</a></b></span> <span class="reference-text">NASA Technical Memorandum 101731; Monitoring Techniques for "X-29A Aircraft's High Speed Rotating Power Takeoff Shaft"; David F Voracek, Ames Research Center, Dryden Flight Research Facility, Edwards, California, December 1990 <a rel="nofollow" class="external text" href="https://www.nasa.gov/centers/dryden/pdf/88209main_H-1680.pdf">nasa.gov</a></span> </li> <li id="cite_note-Spinning-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-Spinning_2-0">^</a></b></span> <span class="reference-text"> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFQuick2008" class="citation journal cs1">Quick, Graeme (March–April 2008). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210226232835if_/http://ausgrain.com.au/Back%20Issues/176magrn08/36_Spinning.pdf">"Spinning an historical yarn about power-take-off shafts"</a> <span class="cs1-format">(PDF)</span>. <i>Australian Grain</i>. <b>17</b> (6). Greenmount Press: 36–37. Archived from <a rel="nofollow" class="external text" href="https://www.ausgrain.com.au/Back%20Issues/176magrn08/36_Spinning.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2021-02-26<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-07-28</span></span>. <q>[From p. 36] The medal for the first recorded power take-off on a piece of mobile machinery on the other hand ought to go to an Aveling and Porter Bell-type reaper. 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(2019-01-02). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353692">"Marketing Farm Safety: Using Principles of Influence to Increase PTO Shielding"</a>. <i>Journal of Agromedicine</i>. <b>24</b> (1): 101–109. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1080%2F1059924X.2018.1539421">10.1080/1059924X.2018.1539421</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1059-924X">1059-924X</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353692">6353692</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/30346257">30346257</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Journal+of+Agromedicine&rft.atitle=Marketing+Farm+Safety%3A+Using+Principles+of+Influence+to+Increase+PTO+Shielding&rft.volume=24&rft.issue=1&rft.pages=101-109&rft.date=2019-01-02&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6353692%23id-name%3DPMC&rft.issn=1059-924X&rft_id=info%3Apmid%2F30346257&rft_id=info%3Adoi%2F10.1080%2F1059924X.2018.1539421&rft.aulast=Tinc&rft.aufirst=Pamela+J.&rft.au=Sorensen%2C+Julie+A.&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6353692&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+take-off" class="Z3988"></span></span> </li> <li id="cite_note-NSC-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-NSC_6-0">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140428005350if_/http://www.nsc.org/news_resources/Resources/Documents/Power_Take_Off%20(PTO).pdf">"Power-Take-Off (PTO) Safety"</a> <span class="cs1-format">(PDF)</span>. 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Department of Agricultural and Biological Engineering. <a href="/wiki/Clemson_University" title="Clemson University"> Clemson University</a>. Archived from <a rel="nofollow" class="external text" href="http://www.clemson.edu/safety/pto.htm">the original</a> on 2005-03-28<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-07-29</span></span>. <q>shields and guards were developed to prevent injury from these rotating shafts</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Farm+Safety+%26+Health+-+PTO+Safety&rft.pub=Clemson+University&rft.date=2002-03-01&rft.aulast=Privette&rft.aufirst=Charles&rft_id=http%3A%2F%2Fwww.clemson.edu%2Fsafety%2Fpto.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+take-off" class="Z3988"></span></span> </li> <li id="cite_note-AIS40-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-AIS40_8-0">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.hse.gov.uk/pubns/ais40.pdf">"Agriculture Information Sheet No 40 (AIS40). Power take-offs and power take-off drive shafts"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/Health_and_Safety_Executive" title="Health and Safety Executive"> Health and Safety Executive UK</a></i>. October 2013 [January 2013]. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20211031104639if_/https://www.hse.gov.uk/pubns/ais40.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2021-10-31<span class="reference-accessdate">. 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Retrieved <span class="nowrap">2009-05-03</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Resource+Magazine&rft.atitle=Last+Word%3A+Why+540%3F&rft.volume=11&rft.issue=8&rft.pages=29&rft.date=2004-10&rft.aulast=Goering&rft.aufirst=Carroll&rft.au=Cedarquist%2C+Scott&rft_id=http%3A%2F%2Fwww.asabe.org%2Fimis%2FStaticContent%2F4%2FOctober_2004%2Fp_31_last_word.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+take-off" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.vmacair.com/product/dtm/">"PTO Air Compressors | Direct-Transmission™ Mounted Air Compressor"</a>. <i>VMAC</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-12-11</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=VMAC&rft.atitle=PTO+Air+Compressors+%7C+Direct-Transmission%E2%84%A2+Mounted+Air+Compressor&rft_id=https%3A%2F%2Fwww.vmacair.com%2Fproduct%2Fdtm%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+take-off" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Bibliography">Bibliography</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_take-off&action=edit&section=9" title="Edit section: Bibliography"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPrippsMorland1993" class="citation cs2">Pripps, Robert N.; Morland, Andrew (photographer) (1993), <i>Farmall Tractors: History of International McCormick-Deering Farmall Tractors</i>, Farm Tractor Color History Series, Osceola, WI, USA: MBI, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-87938-763-1" title="Special:BookSources/978-0-87938-763-1"><bdi>978-0-87938-763-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Farmall+Tractors%3A+History+of+International+McCormick-Deering+Farmall+Tractors&rft.place=Osceola%2C+WI%2C+USA&rft.series=Farm+Tractor+Color+History+Series&rft.pub=MBI&rft.date=1993&rft.isbn=978-0-87938-763-1&rft.aulast=Pripps&rft.aufirst=Robert+N.&rft.au=Morland%2C+Andrew+%28photographer%29&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+take-off" class="Z3988"></span></li></ul> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; 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