{"product_id":"cat-1884210-188-4210-hydraulic-piston-assembly-325d-324d","title":"CAT 1884210 (188-4210) Hydraulic Piston Assembly | Fits 325D 324D 329D 950H","description":"\u003cdiv style=\"margin: 15px 0 25px 0; padding: 15px; background-color: #fcfcfc; border: 1px dashed #e0e0e0; border-radius: 6px; text-align: center;\"\u003e\n\u003cp style=\"margin: 0 0 10px 0; font-weight: bold; font-size: 15px; color: #333;\"\u003eIn Stock \u0026amp; Ready for Global Express Dispatch\u003c\/p\u003e\n\u003ca href=\"\/pages\/contact\" style=\"background-color: #ffcc00; color: #000; padding: 12px 28px; text-decoration: none; font-weight: bold; border-radius: 4px; display: inline-block; font-size: 16px; box-shadow: 0 2px 4px rgba(0,0,0,0.1);\"\u003eRequest a Quick Quote\u003c\/a\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13px; color: #666;\"\u003e✓ Premium Caterpillar Quality Spec  |  ✓ 100% Direct Fit  |  ✓ Fast Global Shipping\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003ePremium hydraulic main pump piston assembly designed as a direct OEM-compatible replacement for Caterpillar (CAT) heavy excavators and wheel loaders. Engineered to restore internal pump pressure, eliminate hydraulic fluid bypass, and deliver exceptional volumetric efficiency and long service life under high-stress duty cycles.\u003c\/p\u003e\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 1884210 \/ 188-4210\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Fit OEM Replacement:\u003c\/strong\u003e Precision-machined dimensions and tolerances perfectly match original Caterpillar hydraulic pump rotating group engineering specs without pump housing modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction:\u003c\/strong\u003e Manufactured with high-strength alloy steel and specialized anti-wear surface treatment to withstand continuous cyclic pressures and high thermal stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Hydraulic Performance:\u003c\/strong\u003e Smooth-sliding piston slippers minimize internal friction, ensure stable pressure output, and restore original machine boom, arm, and swing operation speeds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 15px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2; border-bottom: 2px solid #dddddd;\"\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #dddddd;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #dddddd;\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"border-bottom: 1px solid #dddddd;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e1884210 \/ 188-4210\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #dddddd; background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eHydraulic Main Pump Piston Assembly \/ Piston Shoe Set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #dddddd;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003eBrand Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eCaterpillar (CAT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #dddddd; background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eMain Hydraulic Piston Pump Rebuild \u0026amp; Overhaul\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #dddddd;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003eHigh-Strength Alloy Steel \u0026amp; Precision Wear-Resistant Slipper Bronze\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"border-bottom: 1px solid #dddddd; background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #dddddd;\"\u003e12 Months Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatible Models \u0026amp; Equipment\u003c\/h2\u003e\n\u003cp\u003eThis premium hydraulic piston assembly is engineered to fit a wide range of Caterpillar heavy construction machinery:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaterpillar Excavators:\u003c\/strong\u003e 322C, 322C FM, 324D, 324D L, 324D LN, 324D FM, 324D FM LL, 325C, 325C L, 325C FM, 325D, 325D L, 325D FM, 325D FM LL, 325D MH, 326D L, 328D LCR, 329D, 329D L, 329D LN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaterpillar Material Handlers:\u003c\/strong\u003e M325C MH, M325D MH, M325D L MH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaterpillar Wheel Loaders:\u003c\/strong\u003e 950H, 962H\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydraulic Main Pump Rebuilding:\u003c\/strong\u003e Replaces scored, worn, or damaged pistons during main axial piston pump overhauls to restore peak hydraulic pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachine Power Restoration:\u003c\/strong\u003e Solves issues like slow boom response, hydraulic lag, and system pressure loss caused by excessive internal leakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy Duty Work Cycles:\u003c\/strong\u003e Built for high-stress applications including logging (FM), trenching, material handling (MH), and heavy excavation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose Our Aftermarket CAT Parts?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuaranteed OEM Quality:\u003c\/strong\u003e Manufactured under strict ISO 9001 quality standards to match or exceed original equipment tolerances and durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effective Solution:\u003c\/strong\u003e Achieve premium dealer-level performance and smooth operation at a fraction of the original dealer price.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReady to Ship:\u003c\/strong\u003e Kept in stock for immediate global express dispatch to minimize costly machine breakdown downtime.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry-Leading Support:\u003c\/strong\u003e Backed by a full 1-year warranty and supported by our technical team of heavy machinery hydraulic specialists.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFrequently Asked Questions (FAQ)\u003c\/h2\u003e\n\u003cdiv style=\"background-color: #f9f9f9; border-left: 4px solid #0056b3; padding: 15px; margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this piston assembly a direct fit for CAT part number 188-4210?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this is a precision-engineered aftermarket replacement designed to exact Caterpillar OEM dimensions, ensuring a perfect drop-in fit for part number 1884210 (188-4210).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background-color: #f9f9f9; border-left: 4px solid #0056b3; padding: 15px; margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is covered under the 12-month warranty?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Our 12-month warranty covers all material defects, manufacturing flaws, and excessive premature wear under normal operating and installation conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background-color: #f9f9f9; border-left: 4px solid #0056b3; padding: 15px; margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I replace the entire rotating group when replacing pistons?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e For optimal pump performance and longevity, we strongly recommend inspecting or replacing the cylinder block, valve plate, and retainer plate along with the new pistons to ensure proper seating and pressure sealing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background-color: #f9f9f9; border-left: 4px solid #0056b3; padding: 15px; margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast can this part be delivered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e In-stock orders are dispatched within 3–5 business days, with express air freight service available for urgent machine-down emergencies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003cdiv style=\"text-align: center; background-color: #f4f6f8; padding: 15px; border-radius: 6px; margin: 25px 0;\"\u003e\n\u003cspan style=\"font-size: 16px; color: #333;\"\u003eExplore our full range of Caterpillar hydraulic pump repair parts:\u003c\/span\u003e \u003cbr style=\"margin-bottom: 5px;\"\u003e\u003ca href=\"\/collections\/piston-pump-parts-series\" style=\"color: #0056b3; font-weight: bold; text-decoration: underline; font-size: 17px;\"\u003e View All Hydraulic Piston Pump Parts » \u003c\/a\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align: center; margin-top: 30px;\"\u003eNeed a Quote for CAT 1884210?\u003c\/h3\u003e\n\u003cp style=\"text-align: center;\"\u003eContact us today for instant pricing, wholesale discounts, and global shipping options.\u003c\/p\u003e\n\u003cp style=\"text-align: center; margin-bottom: 30px;\"\u003e\u003ca href=\"\/pages\/contact\" style=\"background-color: #ffcc00; color: #000; padding: 12px 25px; text-decoration: none; font-weight: bold; border-radius: 4px; display: inline-block;\"\u003eRequest a Quote\u003c\/a\u003e\u003c\/p\u003e","brand":"Caterpillar","offers":[{"title":"Default Title","offer_id":47687557185692,"sku":null,"price":0.0,"currency_code":"CNY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/7385\/0524\/files\/caterpillar-188-4210-hydraulic-pump-piston-assembly-1.jpg?v=1790261567","url":"https:\/\/hepumpstore.com\/products\/cat-1884210-188-4210-hydraulic-piston-assembly-325d-324d","provider":"HEPUMP","version":"1.0","type":"link"}