{"id":466,"date":"2019-09-11T11:21:32","date_gmt":"2019-09-11T11:21:32","guid":{"rendered":"https:\/\/www.taopparts.com\/blog\/?p=466"},"modified":"2020-10-16T09:22:00","modified_gmt":"2020-10-16T09:22:00","slug":"axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it","status":"publish","type":"post","link":"https:\/\/www.taopparts.com\/blog\/en\/axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it\/","title":{"rendered":"Axial pistones Hydraulic Pump for Komatsu PC340-7 Wheel Loader: Video repairing and assemble it"},"content":{"rendered":"<p>The hydraulic pump is a device that transforms <strong>mechanical power<\/strong> into <strong>hydraulic energy<\/strong> providing the fluid to the components of the system.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_66_1 counter-flat ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Tabla de contenidos<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.taopparts.com\/blog\/en\/axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it\/#Hydraulic_pump_operation\" title=\"Hydraulic pump operation\">Hydraulic pump operation<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.taopparts.com\/blog\/en\/axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it\/#Posibility_of_execution_of_hydraulic_pumps\" title=\"Posibility of execution of hydraulic pumps\">Posibility of execution of hydraulic pumps<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.taopparts.com\/blog\/en\/axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it\/#Axial_piston_pump_operation\" title=\"Axial piston pump operation\">Axial piston pump operation<\/a><\/li><li class='ez-toc-page-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.taopparts.com\/blog\/en\/axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it\/#Video\" title=\"Video\">Video<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Hydraulic_pump_operation\"><\/span><strong>Hydraulic pump operation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The operation of a pump has two basic characteristics. The first one, is the <strong>mechanical action of rotation<\/strong> that creates the vacuum in the suction area and allows the atmospheric pressure to make the oil rise from the tank to the suction pipe; the second one is based on the fact that the <strong>pump, carrying the fluid (flow), does not generate pressure<\/strong>, so as the oil meets the resistance to move a load, there is an increase of pressure in the system.<\/p>\n<p><a href=\"https:\/\/www.taopparts.com\/en\/332-net\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-301\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/spare-parts-komatsu-volvo-jcb-.png\" alt=\"used spare parts komatsu volvo jcb\" width=\"640\" height=\"215\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/spare-parts-komatsu-volvo-jcb-.png 640w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/spare-parts-komatsu-volvo-jcb--300x101.png 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a><!--more-->The pump must have the correct dimensions to withstand the pressure is generated in the circuit, then, reducing to the minimum the leakages between the <strong>supply area<\/strong> and the <strong>suction area<\/strong>, it must be carried out with extreme accuracy. In fact, the smaller the leakage is, the better the pump performance will be (leaks are losses due to construction tolerances between the different elements of the pump).<\/p>\n<p><strong>Operation of the basic hydraulic scheme<\/strong><\/p>\n<p>The <strong>engine rotation<\/strong>, linked to the pump gear, drags the other <strong>gear<\/strong> generating a depression zone in the suction pipe. The oil pushed by the atmospheric pressure present in the tank and recalled by the depression, fills the entire suction area. Instead, the oil caught between the <strong>gears teeth<\/strong> and the pump walls is pushed towards the discharged outlet and then into the connection tube to the manual distributor that puts the charging mouth in communication with the output.<\/p>\n<p>The oil flows towards the rear chamber of the cylinder, pushing the piston and consequently the cylinder rod moves in the direction indicated by the arrow.<\/p>\n<p>At the same time, the oil contained in the front chamber of the cylinder is directed to the tank passing through the output of the distributor.<\/p>\n<p>The pressure read on the <strong>manometer<\/strong> at the beginning of the cylinder stroke is given by the sum of the strength (load losses) of the various components: <strong>pipe, connector, manual distributor, oil drain resistance, cylinder seals. The stoppage of the piston<\/strong> against the front cylinder head produces the end of stroke, i.e. the cylinder can no longer move.<\/p>\n<p>The pump continues to push oil into the circuit and the oil, having no way out, increases the pressure until a component is broken. To prevent this inconvenience, a <strong>pressure relief valve<\/strong> is inserted on the pump outlet, which has the function of opening at a predetermined pressure (maximum working pressure) and connecting the discharge of the pump with the tank to prevent harmful pressure increases.<\/p>\n<p>The calibration of the relief valve is obtained by loading the spring that holds a ball or a sealing cone in place. When the <strong>pressure exceeds the calibration value<\/strong>, the spring opens, releasing the passage of oil towards the drain. The whole area remains under pressure and the maximum pressure of the circuit is read on the manometer. In this case it would be 80 bar, for example.<\/p>\n<p>Attention should be given to the suction because the pressure is lower (depression) than the atmospheric one. With the pump stopped, the oil cannot rise along the suction pipe because atmospheric pressure also acts inside the pipe.<\/p>\n<p>When the engine is started, the pump draws in the oil and fills both the suction pipe and the pump cavity. (It is the same phenomenon that occurs when a drink is sucked from a can with a straw; a depression in relation to atmospheric pressure is created both in the mouth and in the straw). This causes an imbalance and the outside air pushes the drink through the straw and fills the oral cavity.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Posibility_of_execution_of_hydraulic_pumps\"><\/span>Posibility of execution of hydraulic pumps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In the next diagram we illustrate the possibilities of <em>execution of hydraulic pumps<\/em>:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-475\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/chart-english-1024x576.jpg\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/chart-english-1024x576.jpg 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/chart-english-300x169.jpg 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/chart-english-768x432.jpg 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/chart-english.jpg 1280w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p>\n<p>Especially, we will deal with the <em><strong>Axial Piston Pump<\/strong>.\u00a0<\/em><\/p>\n<p>This type of pump is very common due to its characteristic <strong>continuous operation<\/strong>. They are designed with a variable displacement mechanism to modify the outgoing flow and control the system pressure.<\/p>\n<p><a href=\"https:\/\/www.taopparts.com\/en\/8-parts?q=Set+type-Equipments+and+body\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-301\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/spare-parts-komatsu-volvo-jcb-.png\" alt=\"used spare parts komatsu volvo jcb\" width=\"640\" height=\"215\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/spare-parts-komatsu-volvo-jcb-.png 640w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/spare-parts-komatsu-volvo-jcb--300x101.png 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p>There are different ways of performing this type of control, for example through the inclined plate or inclined body pump. The most common ones have an <strong>inclined plate<\/strong> and consist of having a plate that can tilt with respect to the pistons to obtain a greater or lesser distance for each rotation (a greater displacement corresponds to a greater flow and, therefore, less pressure).<\/p>\n<p>It is generally composed of a <strong>rotating cylindrical body<\/strong>. The pistons are connected by hinges and plates to the inclined plate (which is fixed with respect to the casing) and the pistons are driven by the rotating body.<\/p>\n<p>The inclined body pump has a rotating cylindrical body; the pistons drag the rotating body through their movement or through a bevel gear or universal joint. <em>In axial pumps there are usually 5 or 7 pistons<\/em>.<\/p>\n<p>The odd number of them is necessary to avoid dead spots. This type of pumps are a little more expensive than gear pumps, but offer a longer life if subjected to high pressure, in the presence of contaminants and with long and continuous cycles.<\/p>\n<p><a href=\"https:\/\/www.taopparts.com\/en\/349-chains\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-188\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/neumaticos-industriales-usados.png\" alt=\"Used tires for machinery\" width=\"640\" height=\"215\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/neumaticos-industriales-usados.png 640w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/07\/neumaticos-industriales-usados-300x101.png 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Axial_piston_pump_operation\"><\/span><strong>Axial piston pump operation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The cylinder block forms an angle in relation to the <strong>drive shaft<\/strong>, so each pump piston performs a compression stroke in the first half of the rotation and a suction stroke in the second half of rotation. At the maximum angle, the hydraulic pump provides the <strong>maximum oil flow<\/strong>; by reducing the angle of adjustment the stroke of the pistons also decreases and with it the flow rate of the pump. There is no flow when the cylinder block is at zero degrees in relation to the <strong>crankshaft<\/strong>. By adjusting the <strong>cylinder block<\/strong> in the opposite position to the one illustrated and without changing the direction of rotation of the motor shaft, the compression and suction stroke is reversed. Applications in a circuit where different pressure or flow rates are required.<\/p>\n<p>In the following video we will show how to repair a pump for escape between the two bodies.<\/p>\n<p>The basic steps will be the following:<\/p>\n<p><strong>Preparation of all necessary pieces<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-467\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot8-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot8-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot8-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot8-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot8-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><strong>Servo piston Assembly in the front pump<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-468\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot10-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot10-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot10-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot10-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot10-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><strong>Mounting the bearing on the ramp<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-469\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot12-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot12-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot12-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot12-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot12-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><strong>Cylinder block assembly<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-470\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot13-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot13-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot13-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot13-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot13-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><strong>Mount the servo piston in the rear pump<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-471\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot15-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot15-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot15-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot15-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot15-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><strong>Installing the gasket in the rear pump<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-472\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot16-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot16-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot16-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot16-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot16-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><strong>The two parts assembly\u00a0<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-473\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot17-1-1024x576.png\" alt=\"\" width=\"660\" height=\"371\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot17-1-1024x576.png 1024w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot17-1-300x169.png 300w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot17-1-768x432.png 768w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/snapshot17-1.png 1920w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p>\n<p><strong>Eloy: our technician repairs the pump<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-large wp-image-474\" src=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/2019-03-28-16.20.22-2-1-610x1024.jpg\" alt=\"\" width=\"610\" height=\"1024\" srcset=\"https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/2019-03-28-16.20.22-2-1-610x1024.jpg 610w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/2019-03-28-16.20.22-2-1-179x300.jpg 179w, https:\/\/www.taopparts.com\/blog\/wp-content\/uploads\/2019\/09\/2019-03-28-16.20.22-2-1-768x1288.jpg 768w\" sizes=\"(max-width: 610px) 100vw, 610px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Video\"><\/span>Video<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><iframe loading=\"lazy\" title=\"Reparaci\u00f3n Bomba hidr\u00e1ulica Excavadora Hidr\u00e1ulica -  Komatsu PC340-7 por fuga entre cuerpos.\" width=\"660\" height=\"371\" src=\"https:\/\/www.youtube.com\/embed\/H4cBCFSID-U?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Link of interests:<\/p>\n<ul>\n<li><a href=\"https:\/\/www.taopparts.com\/en\/11-wheel-loader-dismantled-machine\">Wheel loaders for dismantling<\/a><\/li>\n<li><a href=\"https:\/\/www.taopparts.com\/en\/178-bearing?q=Machine+category-Articulated+dump-Wheel+loader\">Bearing for Wheel loaders and articulated dumpers<\/a><\/li>\n<li>\n<p class=\"tittle-product\"><a href=\"https:\/\/www.taopparts.com\/en\/160-pump?q=Machine+category-Crawler+excavator\">Pumps for crawler excavators<\/a><\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The hydraulic pump is a device that transforms mechanical power into hydraulic energy providing the fluid to the components of the system. Hydraulic pump operation The operation of a pump has two basic characteristics. The first one, is the mechanical action of rotation that creates the vacuum in the suction area and allows the atmospheric &hellip; <a href=\"https:\/\/www.taopparts.com\/blog\/en\/axial-pistones-hydraulic-pump-for-komatsu-pc340-7-wheel-loader-video-repairing-and-assemble-it\/\" class=\"more-link\">Sigue leyendo <span class=\"screen-reader-text\">Axial pistones Hydraulic Pump for Komatsu PC340-7 Wheel Loader: Video repairing and assemble it<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":452,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[977,1417,971,969,985,965,1415],"tags":[1703,1349,1035,1033],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Axial pistones Hydraulic Pump for Komatsu PC340-7 Wheel Loader: Video repairing and assemble it &#8226; TAOPPARTS BLOG<\/title>\n<meta name=\"description\" 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