{"id":8399,"date":"2026-09-23T09:25:32","date_gmt":"2026-09-23T01:25:32","guid":{"rendered":"https:\/\/gfmparts.com\/?p=8399"},"modified":"2026-09-23T09:25:33","modified_gmt":"2026-09-23T01:25:33","slug":"troubleshooting-excessive-bulldozer-undercarriage-wear","status":"publish","type":"post","link":"https:\/\/gfmparts.com\/ar\/%d8%a7%d8%b3%d8%aa%d9%83%d8%b4%d8%a7%d9%81-%d8%a3%d8%b3%d8%a8%d8%a7%d8%a8-%d8%a7%d9%84%d8%aa%d8%a2%d9%83%d9%84-%d8%a7%d9%84%d9%85%d9%81%d8%b1%d8%b7-%d9%84%d9%84%d9%87%d9%8a%d9%83%d9%84-%d8%a7%d9%84\/","title":{"rendered":"\u062f\u0644\u064a\u0644 \u0627\u0633\u062a\u0643\u0634\u0627\u0641 \u0623\u062e\u0637\u0627\u0621 \u0627\u0644\u062a\u0622\u0643\u0644 \u0627\u0644\u0645\u0641\u0631\u0637 \u0641\u064a \u0627\u0644\u0647\u064a\u0643\u0644 \u0627\u0644\u0633\u0641\u0644\u064a \u0644\u0644\u062c\u0631\u0627\u0641\u0629 \u0648\u0625\u0635\u0644\u0627\u062d\u0647\u0627"},"content":{"rendered":"<h3 class=\"wp-block-heading\" id=\"h-key-takeaways\">\u0623\u0647\u0645 \u0627\u0644\u0646\u0642\u0627\u0637<\/h3><ul class=\"wp-block-list\"><li><strong>Accurate Wear Diagnosis<\/strong>: By measuring track link pitch elongation (replacement required when exceeding <strong>3%<\/strong>) and track shoe grousers height (replacement required when wear exceeds <strong>40%<\/strong>), the source of <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> wear can be quickly identified.<\/li>\n\n<li><strong>Scientific Selection &amp; Adjustment<\/strong>: Maintaining a standard track sag of <strong>35\u201350 mm<\/strong> and utilizing pin and bushing turn technology can directly extend undercarriage service life by <strong>30%\u201350%<\/strong>.<\/li>\n\n<li><strong>\u0639\u0645\u0644\u064a\u0629 \u0627\u0644\u062a\u0634\u0643\u064a\u0644 \u0628\u0627\u0644\u062a\u0634\u0643\u064a\u0644 \u0639\u0627\u0644\u064a \u0627\u0644\u0642\u0648\u0629<\/strong>: GFM adopts <strong>35MnB<\/strong> high-strength forged steel and medium-frequency induction quenching, achieving a surface hardness of <strong>HRC 52\u201358<\/strong> \u0648\u0639\u0645\u0642 \u0637\u0628\u0642\u0629 \u0635\u0644\u0628\u0629 \u0645\u0646 <strong>8-12 \u0645\u0644\u0645<\/strong>.<\/li>\n\n<li><strong>Strong Factory Assurance<\/strong>: GFM has focused on <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> production since <strong>2011<\/strong>, fully compatible with mainstream brands like Caterpillar, Komatsu, and Shantui, offering a warranty commitment of <strong>\u0644\u0627 \u062a\u0642\u0644 \u0639\u0646 \u0633\u0646\u0629 \u0648\u0627\u062d\u062f\u0629 \u0623\u0648 2000 \u0633\u0627\u0639\u0629<\/strong>.<\/li><\/ul><div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><p>\u0627\u0644 <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> is the most expensive and wear-prone core system in heavy crawler bulldozers, with its procurement and maintenance costs often accounting for <strong>45%\u201350%<\/strong> of the total machine repair expenses. In mine excavation, water conservancy projects, and highly abrasive earthwork operations, <strong>\u0623\u062c\u0632\u0627\u0621 \u0627\u0644\u0647\u064a\u0643\u0644 \u0627\u0644\u0633\u0641\u0644\u064a \u0644\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> frequently face severe wear challenges such as track link uneven wear, sprocket tooth jumping, track roller oil leakage, and track shoe cracking. Excessive wear not only causes frequent equipment downtime but also drastically increases operational costs for engineering buyers and equipment leasing contractors. <\/p><p>As a professional manufacturing factory deep-cultivating the construction machinery field since <strong>2011<\/strong>, GFM relies on <strong>15 \u0633\u0646\u0629<\/strong> of expertise in high-strength forging and heat treatment processes to provide comprehensive professional technical support for wear troubleshooting, structural model selection, and durable long-term solutions for the <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong>.<\/p><div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h2 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-b7750b95be54fa53c07744bf1b9d7e31\" id=\"h-4-steps-to-diagnose-bulldozer-undercarriage-wear\">4 Steps to Diagnose Bulldozer Undercarriage Wear<\/h2><p>Accurately diagnosing the wear status of a <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> is the prerequisite for formulating maintenance solutions. Buyers and field engineers can quickly evaluate the remaining service life of undercarriage parts through the following standard measurement steps:<\/p><ol start=\"1\" class=\"wp-block-list\"><li><strong>Visual Defect Inspection<\/strong>: Focus on checking whether stress cracks have formed on the edges of the track shoe, whether mud slots in the track link are clogged, and whether seal rings on the track roller and idler show oil leaks.<\/li>\n\n<li><strong>Track Link Pitch Elongation Measurement<\/strong>: Use a professional ultrasonic thickness gauge or standard vernier caliper to measure the external length of 4-6 continuous chain links. When the pitch elongation exceeds the factory standard by <strong>3%<\/strong>, it indicates severe internal wear between pins and bushings, which requires timely handling.<\/li>\n\n<li><strong>Sprocket and Grouser Wear Detection<\/strong>: Check whether the sprocket tooth profile shows &#8220;sawtooth&#8221; thinning. When tooth thickness wear reaches <strong>25%<\/strong>, or when track shoe grouser height wear exceeds <strong>40%<\/strong> of the original height, reverse usage or replacement should be arranged.<\/li>\n\n<li><strong>Component Axial Play Check<\/strong>: Measure the axial play of the carrier roller and idler. If the axial play exceeds <strong>2 mm<\/strong>, it will accelerate single-sided galling wear on the track link rails.<\/li><\/ol><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udca1 <strong>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/strong><\/p>\n\n<p><strong>Q: How to quickly determine if bulldozer undercarriage parts need immediate replacement?<\/strong><\/p>\n\n<p><strong>\u0623<\/strong>: By measuring track link pitch elongation (replacement required when exceeding <strong>3%<\/strong>) and track shoe grouser height (replacement required when wear exceeds <strong>40%<\/strong> of original height). When sprocket tooth jumping or track derailment occurs, it indicates that undercarriage parts have reached their ultimate wear limit.<\/p><\/blockquote><div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h2 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-da9708353dad7f7c2dd9c317f41ea79d\" id=\"h-practical-solutions-to-avoid-excessive-undercarriage-wear\">Practical Solutions to Avoid Excessive Undercarriage Wear<\/h2><p>To effectively curb abnormal wear of the <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong>, standard preventive maintenance procedures must be executed on site:<\/p><ul class=\"wp-block-list\"><li><strong>Precise Tension Adjustment<\/strong>: Adjust track sag according to different terrains such as sand, muddy ground, or rock. Standard track sag should be strictly controlled within <strong>35\u201350 mm<\/strong>. Over-tight tracks increase contact stress between chain pins and bushings by over <strong>200%<\/strong>; over-loose tracks cause track slippage and accelerate sprocket wear.<\/li>\n\n<li><strong>Pin and Bushing Turn Technology<\/strong>: When single-sided wear between track chain pins and bushings reaches <strong>50%<\/strong>, perform a <strong>180 \u062f\u0631\u062c\u0629<\/strong> pin and bushing turn in a timely manner to utilize the unworn side for continued service. This measure can extend overall <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> chain service life by <strong>30%\u201350%<\/strong>.<\/li>\n\n<li><strong>Regular Removal of Undercarriage Debris<\/strong>: Hardened mud and rocks inside the undercarriage impede carrier roller rotation, causing sliding dry friction. Daily post-operation cleaning lowers unnecessary friction load by <strong>15%<\/strong>.<\/li>\n\n<li><strong>Standardized Driving Operations<\/strong>: Avoid long-period single-sided high-speed sharp turns and high-speed reverse driving to reduce severe side impact loads on idlers and side guards.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udca1 <strong>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/strong><\/p>\n\n<p><strong>Q: How does bulldozer track tension affect undercarriage wear?<\/strong><\/p>\n\n<p><strong>\u0623<\/strong>: Over-tight tracks increase contact stress between chain pins and bushings by over <strong>200%<\/strong>, accelerating sprocket and track roller wear; over-loose tracks easily cause track slippage, tooth jumping, or even derailment. Maintaining a standard sag of <strong>35\u201350 mm<\/strong> is the key to extending service life.<\/p><\/blockquote><div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h2 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-a42e5dee6e134bc595163b4fa2701497\" id=\"h-scientific-methods-to-choose-the-right-bulldozer-undercarriage\">Scientific Methods to Choose the Right Bulldozer Undercarriage<\/h2><p>Different working conditions place entirely different demands on the physical structure and material properties of a <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong>. Improper model selection is a primary cause of premature wear:<\/p><ul class=\"wp-block-list\"><li><strong>Matching Work Conditions with Track Shoe Types<\/strong>:<ul class=\"wp-block-list\"><li><strong>Mine Rock Conditions<\/strong>: Select <strong>Extreme Service Track Shoes<\/strong> equipped with reinforced grousers for higher bending resistance.<\/li>\n\n<li><strong>Wetland and Soft Soil Conditions<\/strong>: Select <strong>LGP Track Shoes<\/strong> (triangular wide shoes) to increase ground contact area and lower ground pressure.<\/li>\n\n<li><strong>High-Abrasive Sand and Gravel Conditions<\/strong>: Select wear-resistant alloy track links with mud cleaning holes to prevent gravel accumulation and squeezing.<\/li><\/ul><\/li>\n\n<li><strong>Matching Host Tonnage and Compatibility<\/strong>: Verify mounting hole spacing, sprocket tooth count, and chain link pitch to ensure complete compatibility with equipment horsepower output (such as <strong>160HP<\/strong>, <strong>220HP<\/strong>, <strong>320HP<\/strong>, and other tiers).<\/li>\n\n<li><strong>Total Cost of Ownership (TCO) Evaluation<\/strong>: Procurement should not merely compare single-unit initial prices, but calculate &#8220;cost per operating hour&#8221;. High-quality high-hardness undercarriage components may cost <strong>10%\u201315%<\/strong> more upfront, but their service life can increase by over <strong>50%<\/strong>, significantly reducing downtime losses.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udca1 <strong>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/strong><\/p>\n\n<p><strong>Q: How to select appropriate bulldozer undercarriage parts under mine rock working conditions?<\/strong><\/p>\n\n<p><strong>\u0623<\/strong>: Mine conditions should prioritize undercarriage parts made of high-strength forged steel (such as <strong>35MnB<\/strong>), paired with heavy-duty track chains and extreme service track shoes undergoing deep heat treatment (hardness reaching <strong>HRC 52\u201358<\/strong>) to withstand severe impacts and prevent cracking.<\/p><\/blockquote><div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h2 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-6567fd6c57a44812ab2806624a2b7377\" id=\"h-gfm-undercarriage-material-and-heat-treatment-process-advantages\">GFM Undercarriage Material and Heat Treatment Process Advantages<\/h2><p>The reason why <strong>durable bulldozer undercarriage parts<\/strong> produced by GFM Factory maintain outstanding wear resistance in heavy-duty operational environments stems from our strict control over raw material selection and manufacturing processes:<\/p><ol start=\"1\" class=\"wp-block-list\"><li><strong>Selection of Premium High-Strength Forged Steel<\/strong>: GFM strictly selects <strong>35MnB<\/strong> \u0648 <strong>40Mn2<\/strong> high-strength boron steel as core raw materials. Compared with ordinary carbon steel on the market, tensile strength is improved by <strong>35%<\/strong> and yield strength by <strong>40%<\/strong>, eliminating component breakage from the source.<\/li>\n\n<li><strong>Medium-Frequency Induction Quenching &amp; Deep Heat Treatment<\/strong>: Track rollers, carrier rollers, and idlers adopt automated medium-frequency induction quenching and overall tempering processes, ensuring surface hardness reaches <strong>HRC 52\u201358<\/strong> and hardened layer depth is precisely controlled at <strong>8-12 \u0645\u0644\u0645<\/strong>, achieving a &#8220;hard exterior and tough core&#8221; structural feature that resists both wear and severe impact.<\/li>\n\n<li><strong>Full Range Undercarriage Component Coverage<\/strong>: GFM offers complete <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> system solutions, with product lines covering Track Roller, Carrier Roller, Idler, Sprocket, Track Shoe, Track Link, and Track Group.<\/li>\n\n<li><strong>100% Precise Compatibility with Mainstream Brands<\/strong>: GFM undercarriage parts are precision-machined strictly according to OEM standard dimensions and drawings, fully compatible with domestic and international mainstream bulldozer brands including <strong>Komatsu, Caterpillar, Hitachi, Volvo, Kobelco, Daewoo, Doosan, Hyundai, Kubota, Bobcat, Yanmar, SANY, LiuGong, XCMG, and Shantui<\/strong>.<\/li><\/ol><p><strong>Performance Comparison<\/strong><\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Comparison Item<\/strong><\/td><td><strong>GFM Forged Heat-Treated Undercarriage Parts<\/strong><\/td><td><strong>Market Ordinary Cast Undercarriage Parts<\/strong><\/td><td><strong>Performance Improvement Advantage<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>\u0627\u0644\u0645\u0648\u0627\u062f \u0627\u0644\u062e\u0627\u0645<\/strong><\/td><td><strong>35MnB High-Strength Boron Steel<\/strong><\/td><td>Carbon Cast Steel \/ Recycled Scrap Steel<\/td><td>Tensile strength increased by <strong>35%<\/strong><\/td><\/tr><tr><td><strong>\u0635\u0644\u0627\u0628\u0629 \u0627\u0644\u0633\u0637\u062d<\/strong><\/td><td><strong>HRC 52\u201358<\/strong><\/td><td>HRC 42\u201348<\/td><td>Wear resistance performance increased by <strong>50%<\/strong><\/td><\/tr><tr><td><strong>\u0639\u0645\u0642 \u0627\u0644\u0637\u0628\u0642\u0629 \u0627\u0644\u0645\u062a\u0635\u0644\u0628\u0629<\/strong><\/td><td><strong>8-12 \u0645\u0644\u0645<\/strong><\/td><td>3\u20135 mm<\/td><td>Effective working life extended <strong>2x<\/strong><\/td><\/tr><tr><td><strong>Impact Toughness<\/strong><\/td><td><strong>AKV \u2265 28J<\/strong><\/td><td>AKV \u2264 12J<\/td><td>Breakage rate under severe impact reduced by <strong>90%<\/strong><\/td><\/tr><tr><td><strong>Warranty Standard<\/strong><\/td><td><strong>No less than 1 year or 2000 hours<\/strong><\/td><td>No explicit warranty or only 3 months<\/td><td>Provides high-standard risk protection<\/td><\/tr><\/tbody><\/table><\/figure><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udca1 <strong>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/strong><\/p>\n\n<p><strong>Q: Why can GFM&#8217;s heat treatment process significantly enhance bulldozer undercarriage durability?<\/strong><\/p>\n\n<p><strong>\u0623<\/strong>: GFM adopts advanced medium-frequency quenching and comprehensive heat treatment technologies, bringing product surface hardness to <strong>HRC 52\u201358<\/strong> and hardened layer depth to <strong>8-12 \u0645\u0644\u0645<\/strong>. This delivers superior wear resistance in highly abrasive environments while maintaining excellent core toughness (<strong>AKV \u2265 28J<\/strong>).<\/p><\/blockquote><div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div><h2 class=\"wp-block-heading has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-a33aac4a9e871826f479c899534931a9\" id=\"h-gfm-factory-manufacturing-strength-since-2011\">GFM Factory Manufacturing Strength Since 2011<\/h2><p>As a source supplier of undercarriage parts for globally renowned construction machinery, GFM Factory has focused on the research, development, and precision manufacturing of the <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> since its establishment in <strong>2011<\/strong>:<\/p><ul class=\"wp-block-list\"><li><strong>15 Years of Professional Manufacturing Expertise &amp; Scale Capacity<\/strong>: The factory owns large automated CNC machining centers, automatic welding robot production lines, and continuous CNC heat treatment furnaces, capable of handling large-volume global orders and rapid OEM\/ODM custom projects.<\/li>\n\n<li><strong>\u0646\u0638\u0627\u0645 \u0635\u0627\u0631\u0645 \u0644\u0645\u0631\u0627\u0642\u0628\u0629 \u0627\u0644\u062c\u0648\u062f\u0629<\/strong>: From incoming raw material spectral analysis and forging ultrasonic flaw detection to finished product three-coordinate measuring and full hardness inspection, every undercarriage part leaving GFM passes strict quality standard tests.<\/li>\n\n<li><strong>High-Standard Warranty Commitment<\/strong>: GFM provides a quality warranty period of <strong>\u0644\u0627 \u062a\u0642\u0644 \u0639\u0646 \u0633\u0646\u0629 \u0648\u0627\u062d\u062f\u0629 \u0623\u0648 2000 \u0633\u0627\u0639\u0629<\/strong> for the entire series of <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> spare parts, eliminating worries for buyers.<\/li>\n\n<li><strong>Efficient Global Delivery<\/strong>: Sound production supply chain management ensures rapid shipment of standard spare parts, helping global and domestic customers shorten equipment downtime waiting periods.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\ud83d\udca1 <strong>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/strong><\/p>\n\n<p><strong>Q: What quality guarantee does GFM Factory offer for bulldozer undercarriage parts?<\/strong><\/p>\n\n<p><strong>\u0623<\/strong>: GFM commits to providing a quality warranty period of <strong>no less than 1 year or 2000 operating hours<\/strong> for all bulldozer undercarriage parts (including track rollers, carrier rollers, idlers, sprockets, and track groups), with strict quality inspections passed before leaving the factory.<\/p><\/blockquote><figure class=\"wp-block-table aligncenter\"><table class=\"has-ast-global-color-5-color has-luminous-vivid-orange-background-color has-text-color has-background has-link-color has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>\u0627\u062d\u0635\u0644 \u0639\u0644\u0649 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631 \u0633\u0631\u064a\u0639 \u0648\u0645\u062c\u0627\u0646\u064a<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>\u0627\u0644\u0628\u0631\u064a\u062f \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a: henry@gfmparts.com<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>\u0648\u0627\u062a\u0633\u0627\u0628: +86 17705953659<\/strong><\/td><\/tr><\/tbody><\/table><\/figure><p>Solving excessive wear on the <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> requires an organic combination of &#8220;scientific diagnosis + accurate model selection + high-quality parts&#8221;. Leveraging <strong>15 \u0633\u0646\u0629<\/strong> of factory manufacturing strength, advanced heat treatment processes, and rigorous quality control, GFM delivers durable, reliable <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> solutions for equipment buyers worldwide.<\/p><p>If you are seeking a source factory for high-quality, cost-effective <strong>\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0641\u0629<\/strong> parts, or have volume OEM customization requirements, <strong>contact the GFM official technical team immediately to request a Free Sample and exclusive quote solution!<\/strong><\/p><figure class=\"wp-block-image aligncenter size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"563\" src=\"https:\/\/gfmparts.com\/wp-content\/uploads\/2026\/02\/image.webp\" alt=\"\u062c\u064a \u0625\u0641 \u0625\u0645\" class=\"wp-image-7378\" 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\u0623\u0635\u0644\u064a\u0629 \u0639\u0627\u0644\u064a\u0629 \u0627\u0644\u062c\u0648\u062f\u0629 \u0645\u0639 \u0636\u0645\u0627\u0646 \u0644\u0645\u062f\u0629 2000 \u0633\u0627\u0639\u0629. \u062a\u0648\u0627\u0635\u0644 \u0645\u0639\u0646\u0627 \u0644\u0644\u062d\u0635\u0648\u0644 \u0639\u0644\u0649 \u0639\u064a\u0646\u0627\u062a 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