{"product_id":"cat-345c-excavator-piston-pump-2590814","title":"CAT 2590814 (259-0814) Piston Pump | Fits 345C Excavator","description":"\u003ch2\u003eCAT 2590814 (259-0814) Piston Pump | Fits 345C\u003c\/h2\u003e\n\u003cp\u003ePremium hydraulic piston pump designed as a direct OEM-compatible replacement for Caterpillar 345C hydraulic excavator. Built to deliver reliable hydraulic performance and long service life in demanding excavation and material handling applications.\u003c\/p\u003e\n\u003ch3\u003eProduct Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 2590814 \/ 259-0814\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Fit:\u003c\/strong\u003e No modifications required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Performance:\u003c\/strong\u003e Meets or exceeds original Caterpillar specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Precision-engineered for long service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Application:\u003c\/strong\u003e Suitable for hydraulic excavators\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 2590814 \/ 259-0814\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Hydraulic Piston Pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand Compatibility:\u003c\/strong\u003e Caterpillar (CAT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Hydraulic System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12 Months\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Models\u003c\/h3\u003e\n\u003cp\u003eThis piston pump fits the following Caterpillar hydraulic excavator:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCaterpillar 345C Hydraulic Excavator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHydraulic System\u003c\/li\u003e\n\u003cli\u003eExcavator Hydraulics\u003c\/li\u003e\n\u003cli\u003eHeavy Duty Excavation Applications\u003c\/li\u003e\n\u003cli\u003eMining and Material Handling Equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Choose This Pump?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eQuality Guaranteed - Manufactured to meet OEM standards\u003c\/li\u003e\n\u003cli\u003eReady to Ship - In stock and available for immediate dispatch\u003c\/li\u003e\n\u003cli\u003eExpert Support - Technical assistance available\u003c\/li\u003e\n\u003cli\u003eCompetitive Pricing - Cost-effective alternative to dealer parts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the symptoms of a failing hydraulic piston pump on a CAT 345C excavator?\u003c\/strong\u003e\u003cbr\u003eA: Common signs include slow or weak boom, arm, and bucket response, the excavator struggling to dig under load, hydraulic oil overheating faster than normal, whining or knocking noise from the hydraulic pump area, and visible external hydraulic fluid leakage around the pump housing. If your 345C is losing hydraulic power or operating noticeably slower, the main piston pump is likely worn and should be inspected.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which CAT excavator models does the 2590814 piston pump fit?\u003c\/strong\u003e\u003cbr\u003eA: The 2590814 (259-0814) is designed as a direct OEM-compatible replacement for the CAT 345C hydraulic excavator. The 345C is a 45-ton large excavator commonly used in heavy excavation, quarry, and mining applications. Contact us with your excavator serial number to confirm exact compatibility.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What hydraulic functions does this pump support on the 345C?\u003c\/strong\u003e\u003cbr\u003eA: As the main hydraulic pump on the 345C, it supplies flow to all hydraulic circuits — boom, arm, bucket, swing, and travel functions. A failing main pump will cause weak or slow operation across all functions simultaneously. If only one function is affected, the problem may be a control valve rather than the pump.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I flush the hydraulic system when replacing this pump?\u003c\/strong\u003e\u003cbr\u003eA: Absolutely. Flushing the hydraulic system is critical when replacing the main pump. Metal particles and contaminants from the old pump can damage the new pump within hours. Drain and replace the hydraulic oil, flush the system with clean oil, and install fresh filters. We strongly recommend professional installation by a qualified technician or CAT dealer service center.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What type of hydraulic oil is recommended for the CAT 345C after a pump replacement?\u003c\/strong\u003e\u003cbr\u003eA: Caterpillar recommends Cat HYDO Advanced 10W or 30W hydraulic oil depending on ambient operating temperature. Using non-CAT hydraulic fluids can void warranties and cause premature pump wear. When replacing the main pump, always use fresh, clean hydraulic oil — never reuse the old oil.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this is the correct pump for my 345C?\u003c\/strong\u003e\u003cbr\u003eA: Check the part number on your current hydraulic pump — if it reads 2590814 or 259-0814, this is the correct replacement. If the label is worn or missing, provide us with your 345C excavator serial number and we will verify compatibility before you order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this pump come with mounting hardware or gaskets included?\u003c\/strong\u003e\u003cbr\u003eA: The pump is supplied as a complete unit. Depending on your 345C configuration, you may need separate mounting bolts, gaskets, or O-rings. Contact us with your serial number and we will confirm exactly what is included and what additional parts you may need for installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the warranty on this hydraulic piston pump?\u003c\/strong\u003e\u003cbr\u003eA: This piston pump comes with a 12-month warranty covering manufacturing defects. The warranty does not cover damage caused by contaminated hydraulic oil, improper installation, failure to flush the hydraulic system, or using incorrect hydraulic fluids.\u003c\/p\u003e\n\u003cp\u003eLooking for this piston pump? Contact us today for pricing, availability, and lead time information.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cp\u003eExplore our full range of \u003ca href=\"\/collections\/construction-machinery-caterpillar\"\u003eCaterpillar piston pumps\u003c\/a\u003e.\u003c\/p\u003e","brand":"Caterpillar","offers":[{"title":"Default Title","offer_id":46632456159388,"sku":"CAT-345C-2590814","price":0.0,"currency_code":"CNY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/7385\/0524\/files\/2590814_1.jpg?v=1775396859","url":"https:\/\/hepumpstore.com\/products\/cat-345c-excavator-piston-pump-2590814","provider":"HEPUMP","version":"1.0","type":"link"}