{"id":630,"date":"2023-10-07T07:40:15","date_gmt":"2023-10-07T07:40:15","guid":{"rendered":"https:\/\/swingbearing.net\/?p=630"},"modified":"2024-06-02T04:45:30","modified_gmt":"2024-06-02T04:45:30","slug":"fault-inspection-of-excavator-without-rotation","status":"publish","type":"post","link":"https:\/\/swingbearing.net\/da\/fault-inspection-of-excavator-without-rotation\/","title":{"rendered":"Fejlinspektion af gravemaskine uden rotation"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"fault-of-excavator-without-rotation-it-was-found-that-there-was-no-rotation-movement-while-other-movements-were-normal\">Fejl p\u00e5 gravemaskine uden rotation: Det blev konstateret, at der ikke var nogen rotationsbev\u00e6gelse, mens andre bev\u00e6gelser var normale.<\/h2>\n\n\n\n<p>N\u00e5r betjeningsh\u00e5ndtaget placeres i rotationspositionen, n\u00e5r kontrololien kontrolventilen og skubber den roterende ventilstang for at f\u00f8re h\u00f8jtryksolien fra den bageste arbejdsoliepumpe ind i den roterende motor; Samtidig afbrydes oliekredsl\u00f8bet, der styrer oliereturneringen til tanken, hvilket \u00f8ger trykket i bremseudl\u00f8sningsventilen, skubber ventilspindlen for at lade en anden hj\u00e6lpetryksolie komme ind i bremsestemplet, \u00e5bner svingbremseanordningen og f\u00e5r svingmotoren til at virke; Den roterende motor afgiver kraft gennem gearkassens lille gear, som griber ind i den roterende gearring for at generere en roterende bev\u00e6gelse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"fault-cause-analysis-and-inspection\">Analyse af fejl\u00e5rsager og inspektion:<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"550\" height=\"400\" src=\"https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/06\/550400.jpg\" alt=\"excavator without rotation\" class=\"wp-image-3750\" srcset=\"https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/06\/550400.jpg 550w, https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/06\/550400-300x218.jpg 300w, https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/06\/550400-18x12.jpg 18w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/><figcaption class=\"wp-element-caption\">excavator without rotation<\/figcaption><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>Ud fra arbejdsprincippet for den roterende mekanisme er der tre grunde til fejlfunktionen, nemlig det vigtigste arbejdsoliekredsl\u00f8b, den mekaniske transmission og kontrololiekredsl\u00f8bet.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-inspection-of-the-main-working-oil-circuit\">(1) Inspektion af det prim\u00e6re arbejdsoliekredsl\u00f8b<\/h3>\n\n\n\n<p>Hvis trykket i det svingende hovedoliekredsl\u00f8b er lavt, vil det ikke v\u00e6re muligt at generere svingning. M\u00e5l trykket i det prim\u00e6re arbejdsoliekredsl\u00f8bssystem. Der er en indvendig sekskantet olieprop ved trykudtaget p\u00e5 den bageste arbejdsoliepumpe. Fjern den, og monter en trykm\u00e5ler. Betjen drejeh\u00e5ndtaget for at accelerere dieselmotoren. Det m\u00e5lte tryk n\u00e5r 23,5 MPa, hvilket er systemets normale arbejdstryk. Dette indikerer, at alle hydrauliske komponenter i hovedarbejdsoliekredsl\u00f8bet er normale.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/swingbearing.net\/da\/home\/excavator-parts\/\"><img decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/05\/sw22.jpg\" alt=\"Svinglejer til gravemaskiner\" class=\"wp-image-2930\" srcset=\"https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/05\/sw22.jpg 600w, https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/05\/sw22-300x300.jpg 300w, https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/05\/sw22-150x150.jpg 150w, https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/05\/sw22-12x12.jpg 12w, https:\/\/swingbearing.net\/wp-content\/uploads\/2024\/05\/sw22-100x100.jpg 100w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><figcaption class=\"wp-element-caption\">Svinglejer til gravemaskiner<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-inspection-of-mechanical-transmission-part\">(2) Inspektion af den mekaniske transmissionsdel<\/h3>\n\n\n\n<p>Den roterende motor afgiver kraft gennem det lille gear i transmissionen, som roterer rundt om den roterende gearring. Hvis de tandhjul, der griber ind i hinanden, sidder fast under denne kraftudvekslingsproces, vil der heller ikke v\u00e6re nogen rotation.<\/p>\n\n\n\n<p>Generelt kan unormalt gearindgreb for\u00e5rsage unormal st\u00f8j. I \u00f8jeblikket har f\u00f8reren ikke h\u00f8rt nogen unormal lyd under drift, s\u00e5 mekaniske transmissionsfejl kan midlertidigt udelukkes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-inspection-of-control-oil-circuit\">(3) Inspektion af kontrololiekredsl\u00f8bet<\/h3>\n\n\n\n<p>Da alle gravemaskinens andre funktioner er normale, tyder det p\u00e5, at den ekstra oliepumpe, der leverer kontrololietryk, fungerer normalt. Der er tre kontrololiekredsl\u00f8b til den roterende handling, nemlig det oliekredsl\u00f8b, der styrer den roterende ventilspindel, bremseudl\u00f8sningsventilen og det oliekredsl\u00f8b, der kommer ind i parkeringsbremsestemplet. Den specifikke analyse er som f\u00f8lger.<\/p>\n\n\n\n<p>N\u00e5r du betjener drejeh\u00e5ndtaget, er der en st\u00e6rk olieinfluenza, n\u00e5r du r\u00f8rer ved drejemotorens trykolier\u00f8r, hvilket indikerer, at den vigtigste arbejdstrykolie har n\u00e5et drejemotoren, at reguleringsventilens drejeventilspindel kan \u00e5bnes normalt, og at reguleringsoliekredsl\u00f8bet fungerer normalt. M\u00e5l olietrykket til parkeringsbremsestemplet. \u00c5bn r\u00f8rforbindelsen i oliekredsl\u00f8bet til den roterende motor, installer trevejsforbindelsen og trykm\u00e5leren, og det m\u00e5lte tryk n\u00e5r 4MPa, hvilket indikerer, at trykket i oliekredsl\u00f8bet er normalt.<\/p>\n\n\n\n<p>M\u00e5l olietrykket til bremseudl\u00f8sningsventilen. \u00c5bn r\u00f8rleddet i oliekredsl\u00f8bet til den roterende motor, installer trevejsleddet og trykm\u00e5leren, og det m\u00e5lte tryk er 0,4-0,6MPa. Det er klart, at dette tryk er for lavt (normalt arbejdstryk skal v\u00e6re 4MPa) til at \u00e5bne bremseudl\u00f8sningsventilen, og kontrololien fra det andet kredsl\u00f8b kan ikke str\u00f8mme ind i bremsestemplet, endsige \u00e5bne den roterende bremseanordning. Derfor er der ingen handling i rotationen. Der er to grunde til det lave tryk i dette oliekredsl\u00f8b. Den ene er, at kontrolventilen l\u00e6kker, hvilket f\u00e5r olietrykket, der kommer ind i bremsel\u00f8sningsventilen, til at falde. (Tilslut trykm\u00e5leren til r\u00f8rforbindelsen p\u00e5 kontrololier\u00f8ret fra kontrolventilen til bremseudl\u00f8serventilen, og det m\u00e5lte olietryk er kun 0,4-0,6 MPa, hvilket indikerer, at vurderingen af kontrolventilens l\u00e6kage er korrekt.); Den anden grund er, at bremseudl\u00f8serventilen l\u00e6kker p\u00e5 grund af slitage, hvilket \u00f8ger pasningsgabet (efter demontering og inspektion passer ventilspindlen og ventilhullet godt, og der er ikke noget fastklemningsf\u00e6nomen).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"troubleshooting-an-in-depth-guide-to-diagnosing-and-resolving-control-valve-malfunctions-in-excavators\">Troubleshooting: An In-Depth Guide to Diagnosing and Resolving Control Valve Malfunctions in Excavators<\/h2>\n\n\n\n<p>Excavators are complex pieces of machinery that rely heavily on their hydraulic systems to perform a variety of tasks, from digging and lifting to rotating and moving. One of the critical components in this hydraulic system is the control valve. The control valve regulates the flow and direction of hydraulic fluid, enabling precise control over the excavator&#8217;s movements. However, when a malfunction occurs, it can severely impact the performance and efficiency of the machine. This detailed guide delves into the process of troubleshooting a control valve malfunction, including the steps taken to diagnose the issue, the repair process, and the measures to prevent future problems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"understanding-the-role-of-control-valves-in-excavators\">Understanding the Role of Control Valves in Excavators<\/h2>\n\n\n\n<p>Control valves are essential for directing hydraulic fluid to different parts of the excavator. They are responsible for controlling the flow rate and pressure of the hydraulic fluid, which in turn controls the speed and force of the machine\u2019s movements. The primary functions of control valves in an excavator include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Regulating Fluid Flow:<\/strong> Control valves manage the flow of hydraulic fluid to various actuators, such as cylinders and motors, which drive the excavator\u2019s movements.<\/li>\n\n\n\n<li><strong>Controlling Direction:<\/strong> By adjusting the direction of fluid flow, control valves determine the direction in which the machine\u2019s components move.<\/li>\n\n\n\n<li><strong>Maintaining Pressure:<\/strong> Control valves help maintain the necessary pressure levels within the hydraulic system to ensure efficient operation.<\/li>\n<\/ul>\n\n\n\n<p>Given their critical role, any malfunction in the control valve can lead to significant operational issues, such as erratic movements, reduced power, and complete failure of specific functions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"symptoms-of-control-valve-malfunctions\">Symptoms of Control Valve Malfunctions<\/h2>\n\n\n\n<p>Before diving into the troubleshooting process, it\u2019s essential to recognize the common symptoms of control valve malfunctions. These symptoms can help in early detection and prompt action to prevent further damage to the excavator. Common signs of control valve issues include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Erratic Movements:<\/strong> Inconsistent or jerky movements of the excavator\u2019s arm, bucket, or tracks.<\/li>\n\n\n\n<li><strong>Loss of Power:<\/strong> Reduced force or speed in hydraulic functions, indicating a possible issue with fluid flow or pressure.<\/li>\n\n\n\n<li><strong>Hydraulic Fluid Leaks:<\/strong> Visible leaks around the control valve area, suggesting seal or component failure.<\/li>\n\n\n\n<li><strong>Unusual Noises:<\/strong> Hissing, whining, or knocking sounds from the hydraulic system, which could indicate fluid flow disruptions or air ingress.<\/li>\n\n\n\n<li><strong>Overheating:<\/strong> Excessive heat in the hydraulic system, often caused by restricted fluid flow or pressure imbalances.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"diagnosing-the-control-valve-malfunction\">Diagnosing the Control Valve Malfunction<\/h2>\n\n\n\n<p>The first step in troubleshooting a control valve malfunction is a thorough diagnosis. This involves a systematic approach to identify the root cause of the problem. Here\u2019s a detailed breakdown of the diagnostic process:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-visual-inspection\">1. Visual Inspection<\/h3>\n\n\n\n<p>Begin with a visual inspection of the control valve and the surrounding hydraulic components. Look for signs of wear, damage, or leaks. Pay close attention to the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Seals and Gaskets:<\/strong> Check for any visible cracks, tears, or deterioration in seals and gaskets that might cause fluid leaks.<\/li>\n\n\n\n<li><strong>Connections and Hoses:<\/strong> Inspect the hydraulic hoses and connections for signs of wear, damage, or loose fittings.<\/li>\n\n\n\n<li><strong>Valve Body:<\/strong> Examine the control valve body for any signs of physical damage, such as cracks or corrosion.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-hydraulic-fluid-analysis\">2. Hydraulic Fluid Analysis<\/h3>\n\n\n\n<p>The condition of the hydraulic fluid can provide valuable insights into the health of the control valve and the entire hydraulic system. Perform the following checks:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fluid Level:<\/strong> Ensure that the hydraulic fluid level is within the recommended range. Low fluid levels can cause air to enter the system, leading to erratic movements and reduced performance.<\/li>\n\n\n\n<li><strong>Fluid Quality:<\/strong> Check the color, viscosity, and presence of contaminants in the hydraulic fluid. Dark, cloudy, or contaminated fluid indicates the need for a fluid change and potential issues with the control valve.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-pressure-testing\">3. Pressure Testing<\/h3>\n\n\n\n<p>Pressure testing the hydraulic system can help identify issues related to fluid flow and pressure regulation. Use a hydraulic pressure gauge to perform the following tests:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>System Pressure:<\/strong> Measure the overall system pressure to ensure it is within the manufacturer\u2019s specifications. Deviations from the recommended pressure levels can indicate valve malfunctions.<\/li>\n\n\n\n<li><strong>Pressure Drops:<\/strong> Check for any significant pressure drops across the control valve, which can suggest internal leaks or blockages.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-functional-testing\">4. Functional Testing<\/h3>\n\n\n\n<p>Conduct functional tests to observe the performance of the control valve under different operating conditions. These tests can help pinpoint specific issues:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Actuator Response:<\/strong> Operate the excavator\u2019s functions, such as lifting the arm, rotating the body, or moving the tracks, and observe the response. Slow, weak, or inconsistent movements can indicate control valve problems.<\/li>\n\n\n\n<li><strong>Directional Control:<\/strong> Test the directional control by moving the actuators in various directions. Difficulty in changing direction or delayed responses can be signs of valve issues.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"identifying-the-root-cause-leakage-in-the-control-valve\">Identifying the Root Cause: Leakage in the Control Valve<\/h2>\n\n\n\n<p>In this case study, the primary symptom observed was erratic rotational movements of the excavator. Upon conducting the above diagnostic steps, it was determined that the main cause of the malfunction was leakage in the control valve. Here\u2019s a detailed analysis of the findings:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-visual-inspection-1\">1. Visual Inspection<\/h3>\n\n\n\n<p>During the visual inspection, hydraulic fluid leaks were detected around the control valve area. The seals and gaskets appeared worn and deteriorated, indicating a potential source of the leakage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-hydraulic-fluid-analysis-2\">2. Hydraulic Fluid Analysis<\/h3>\n\n\n\n<p>The hydraulic fluid analysis revealed contamination with particles and moisture, which can accelerate wear and damage to the control valve components. The fluid\u2019s color and viscosity suggested that it had not been changed according to the recommended maintenance schedule.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-pressure-testing-3\">3. Pressure Testing<\/h3>\n\n\n\n<p>Pressure testing indicated significant pressure drops across the control valve, confirming internal leaks. The system pressure was also lower than the manufacturer\u2019s specifications, further supporting the diagnosis of valve leakage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-functional-testing-4\">4. Functional Testing<\/h3>\n\n\n\n<p>Functional testing showed inconsistent and weak rotational movements, which aligned with the symptoms of control valve leakage. The directional control was also affected, with delays and difficulties in changing directions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"repairing-the-control-valve\">Repairing the Control Valve<\/h2>\n\n\n\n<p>Given the complexity and critical role of the control valve, repairing it requires careful attention and expertise. Here\u2019s a step-by-step guide to the repair process:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-removing-the-control-valve\">1. Removing the Control Valve<\/h3>\n\n\n\n<p>To access and repair the control valve, it is necessary to remove it from the excavator. This involves the following steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Disconnecting Hydraulic Lines:<\/strong> Carefully disconnect the hydraulic lines connected to the control valve, ensuring to cap them to prevent fluid spillage and contamination.<\/li>\n\n\n\n<li><strong>Disconnecting Electrical Connections:<\/strong> If the control valve has any electrical connections, disconnect them to facilitate removal.<\/li>\n\n\n\n<li><strong>Removing Mounting Bolts:<\/strong> Remove the bolts or screws securing the control valve to the hydraulic system or frame.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-disassembling-the-control-valve\">2. Disassembling the Control Valve<\/h3>\n\n\n\n<p>Once the control valve is removed, disassemble it to inspect and replace the damaged components. This involves:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Opening the Valve Housing:<\/strong> Carefully open the control valve housing, taking note of the arrangement and orientation of internal components.<\/li>\n\n\n\n<li><strong>Inspecting Internal Components:<\/strong> Examine the internal components, such as seals, gaskets, and valve spools, for signs of wear, damage, or contamination.<\/li>\n\n\n\n<li><strong>Cleaning and Replacing Parts:<\/strong> Clean all components thoroughly and replace any worn or damaged parts with new ones. Ensure that the replacement parts meet the manufacturer\u2019s specifications.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-reassembling-the-control-valve\">3. Reassembling the Control Valve<\/h3>\n\n\n\n<p>After replacing the damaged components, reassemble the control valve with careful attention to detail:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reinstalling Internal Components:<\/strong> Reinstall the internal components in the correct order and orientation, ensuring proper alignment and fit.<\/li>\n\n\n\n<li><strong>Sealing the Valve Housing:<\/strong> Securely close the valve housing, ensuring that all seals and gaskets are correctly positioned to prevent future leaks.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-reinstalling-the-control-valve\">4. Reinstalling the Control Valve<\/h3>\n\n\n\n<p>With the control valve repaired and reassembled, reinstall it into the excavator:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mounting the Valve:<\/strong> Secure the control valve to the hydraulic system or frame using the mounting bolts or screws.<\/li>\n\n\n\n<li><strong>Reconnecting Hydraulic Lines:<\/strong> Reconnect the hydraulic lines, ensuring that they are securely fastened and free from leaks.<\/li>\n\n\n\n<li><strong>Reconnecting Electrical Connections:<\/strong> If applicable, reconnect any electrical connections.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-testing-the-repaired-control-valve\">5. Testing the Repaired Control Valve<\/h3>\n\n\n\n<p>After reinstalling the control valve, perform comprehensive tests to ensure that the repair was successful:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pressure Testing:<\/strong> Conduct pressure tests to verify that the hydraulic system pressure is within the manufacturer\u2019s specifications and that there are no significant pressure drops across the control valve.<\/li>\n\n\n\n<li><strong>Functional Testing:<\/strong> Operate the excavator\u2019s functions to ensure smooth and consistent movements. Check for any signs of leaks or abnormalities.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"preventing-future-control-valve-malfunctions\">Preventing Future Control Valve Malfunctions<\/h2>\n\n\n\n<p>To prevent future control valve malfunctions and ensure the longevity of the excavator\u2019s hydraulic system, implement the following maintenance practices:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-regular-fluid-checks-and-changes\">1. Regular Fluid Checks and Changes<\/h3>\n\n\n\n<p>Regularly check the hydraulic fluid level and quality, and change it according to the manufacturer\u2019s recommendations. Using clean, high-quality hydraulic fluid helps prevent contamination and reduces wear on the control valve components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-routine-inspection-and-replacement-of-seals-and-gaskets\">2. Routine Inspection and Replacement of Seals and Gaskets<\/h3>\n\n\n\n<p>Inspect seals and gaskets regularly for signs of wear and deterioration. Replace them as needed to prevent leaks and maintain optimal pressure within the hydraulic system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-regular-maintenance-schedule\">3. Regular Maintenance Schedule<\/h3>\n\n\n\n<p>Implement a regular maintenance schedule that includes checking the condition of the control valve, hydraulic lines, and other components. Timely maintenance helps identify and address potential issues before they lead to significant malfunctions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-operator-training\">4. Operator Training<\/h3>\n\n\n\n<p>Ensure that operators are trained in the correct use and maintenance of the excavator\u2019s hydraulic system. Proper operation and handling can reduce the risk of damage and prolong the lifespan of the control valve and other components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-using-genuine-parts\">5. Using Genuine Parts<\/h3>\n\n\n\n<p>Always use genuine parts and components that meet the manufacturer\u2019s specifications when repairing or replacing parts of the hydraulic system. This ensures compatibility and reliability, reducing the risk of future malfunctions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"380\" height=\"262\" src=\"https:\/\/swingbearing.net\/wp-content\/uploads\/2023\/09\/CAT.jpg\" alt=\"Svinglejer\" class=\"wp-image-504\" srcset=\"https:\/\/swingbearing.net\/wp-content\/uploads\/2023\/09\/CAT.jpg 380w, https:\/\/swingbearing.net\/wp-content\/uploads\/2023\/09\/CAT-300x207.jpg 300w\" sizes=\"(max-width: 380px) 100vw, 380px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Indholdsfortegnelse<\/h2><nav><ul><li><a href=\"#fault-of-excavator-without-rotation-it-was-found-that-there-was-no-rotation-movement-while-other-movements-were-normal\">Fejl p\u00e5 gravemaskine uden rotation: Det blev konstateret, at der ikke var nogen rotationsbev\u00e6gelse, mens andre bev\u00e6gelser var normale.<\/a><\/li><li><a href=\"#fault-cause-analysis-and-inspection\">Analyse af fejl\u00e5rsager og inspektion:<\/a><ul><li><a href=\"#1-inspection-of-the-main-working-oil-circuit\">(1) Inspektion af det prim\u00e6re arbejdsoliekredsl\u00f8b<\/a><\/li><li><a href=\"#2-inspection-of-mechanical-transmission-part\">(2) Inspektion af den mekaniske transmissionsdel<\/a><\/li><li><a href=\"#3-inspection-of-control-oil-circuit\">(3) Inspektion af kontrololiekredsl\u00f8bet<\/a><\/li><\/ul><\/li><li><a href=\"#troubleshooting-an-in-depth-guide-to-diagnosing-and-resolving-control-valve-malfunctions-in-excavators\">Troubleshooting: An In-Depth Guide to Diagnosing and Resolving Control Valve Malfunctions in Excavators<\/a><\/li><li><a href=\"#understanding-the-role-of-control-valves-in-excavators\">Understanding the Role of Control Valves in Excavators<\/a><\/li><li><a href=\"#symptoms-of-control-valve-malfunctions\">Symptoms of Control Valve Malfunctions<\/a><\/li><li><a href=\"#diagnosing-the-control-valve-malfunction\">Diagnosing the Control Valve Malfunction<\/a><ul><li><a href=\"#1-visual-inspection\">1. Visual Inspection<\/a><\/li><li><a href=\"#2-hydraulic-fluid-analysis\">2. Hydraulic Fluid Analysis<\/a><\/li><li><a href=\"#3-pressure-testing\">3. Pressure Testing<\/a><\/li><li><a href=\"#4-functional-testing\">4. Functional Testing<\/a><\/li><\/ul><\/li><li><a href=\"#identifying-the-root-cause-leakage-in-the-control-valve\">Identifying the Root Cause: Leakage in the Control Valve<\/a><ul><li><a href=\"#1-visual-inspection-1\">1. Visual Inspection<\/a><\/li><li><a href=\"#2-hydraulic-fluid-analysis-2\">2. Hydraulic Fluid Analysis<\/a><\/li><li><a href=\"#3-pressure-testing-3\">3. Pressure Testing<\/a><\/li><li><a href=\"#4-functional-testing-4\">4. Functional Testing<\/a><\/li><\/ul><\/li><li><a href=\"#repairing-the-control-valve\">Repairing the Control Valve<\/a><ul><li><a href=\"#1-removing-the-control-valve\">1. Removing the Control Valve<\/a><\/li><li><a href=\"#2-disassembling-the-control-valve\">2. Disassembling the Control Valve<\/a><\/li><li><a href=\"#3-reassembling-the-control-valve\">3. Reassembling the Control Valve<\/a><\/li><li><a href=\"#4-reinstalling-the-control-valve\">4. Reinstalling the Control Valve<\/a><\/li><li><a href=\"#5-testing-the-repaired-control-valve\">5. Testing the Repaired Control Valve<\/a><\/li><\/ul><\/li><li><a href=\"#preventing-future-control-valve-malfunctions\">Preventing Future Control Valve Malfunctions<\/a><ul><li><a href=\"#1-regular-fluid-checks-and-changes\">1. Regular Fluid Checks and Changes<\/a><\/li><li><a href=\"#2-routine-inspection-and-replacement-of-seals-and-gaskets\">2. Routine Inspection and Replacement of Seals and Gaskets<\/a><\/li><li><a href=\"#3-regular-maintenance-schedule\">3. Regular Maintenance Schedule<\/a><\/li><li><a href=\"#4-operator-training\">4. Operator Training<\/a><\/li><li><a href=\"#5-using-genuine-parts\">5. Using Genuine Parts<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>","protected":false},"excerpt":{"rendered":"<p>Fault of excavator without rotation: It was found that there was no rotation movement, while other movements were normal. When the operating handle is placed in the rotary position, the control oil reaches the control valve and pushes the rotary valve rod to feed the high-pressure oil provided by the rear working oil pump into [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":631,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_breakdance_hide_in_design_set":false,"_breakdance_tags":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-630","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/posts\/630","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/comments?post=630"}],"version-history":[{"count":0,"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/posts\/630\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/media\/631"}],"wp:attachment":[{"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/media?parent=630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/categories?post=630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swingbearing.net\/da\/wp-json\/wp\/v2\/tags?post=630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}