{"product_id":"cat-330d-336d-m330d-piston-pump-2590815-259-0815","title":"CAT 2590815 (259-0815) Piston Pump | Fits 330D 336D M330D Excavator","description":"\u003ch2\u003eCAT 2590815 (259-0815) Piston Pump | Fits 330D 336D M330D Excavator\u003c\/h2\u003e\n\u003cp\u003ePremium hydraulic piston pump designed as a direct OEM-compatible replacement for Caterpillar 330D, 336D, and M330D excavators. Built to deliver consistent hydraulic performance and long service life in demanding mining, quarry, and heavy excavation applications.\u003c\/p\u003e\n\u003ch3\u003eProduct Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 2590815 \/ 259-0815\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 mining, quarry, and heavy excavation projects\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 2590815 \/ 259-0815\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Variable Displacement 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 excavators:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCaterpillar 330D Excavator\u003c\/li\u003e\n\u003cli\u003eCaterpillar 336D Excavator\u003c\/li\u003e\n\u003cli\u003eCaterpillar M330D Excavator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExcavator Boom and Arm Hydraulic Circuits\u003c\/li\u003e\n\u003cli\u003eExcavator Bucket and Slewing Functions\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Digging and Trenching Operations\u003c\/li\u003e\n\u003cli\u003eMining, Quarry, and Heavy Excavation Projects\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 CAT 330D, 336D, or M330D excavators?\u003c\/strong\u003e\u003cbr\u003eA: Common signs include slow or weak boom, arm, and bucket response, the excavator struggling to dig or lift under load, hydraulic oil overheating during normal operation, whining or knocking noise from the pump area, and visible external hydraulic fluid leakage around the pump housing. The 330D, 336D, and M330D are 30–36 ton class excavators used in heavy excavation, quarry, and mining — a failing main pump will cause significant productivity loss across all hydraulic functions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the 2590815 fit all three models — 330D, 336D, and M330D?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the 2590815 (259-0815) is designed as a direct OEM-compatible replacement for the CAT 330D, 336D, and M330D hydraulic excavators. All three share the same pump mounting and hydraulic system architecture. The M330D is a material handler variant with similar hydraulic demands. 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?\u003c\/strong\u003e\u003cbr\u003eA: As the main hydraulic pump on the 330D, 336D, and M330D, it supplies flow to all major hydraulic circuits — boom, arm, bucket, swing, and travel functions. A failing main pump causes 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 itself.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Should I flush the hydraulic system when replacing this pump?\u003c\/strong\u003e\u003cbr\u003eA: Always. Flushing the hydraulic system is essential. Metal particles and contaminants from the old pump can destroy a new pump within hours. Drain and replace all hydraulic oil, flush the system with clean oil, replace all filters, and refill with fresh Cat HYDO Advanced hydraulic oil. 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 330D, 336D, and M330D?\u003c\/strong\u003e\u003cbr\u003eA: Caterpillar specifies Cat HYDO Advanced 10W or 30W depending on ambient operating temperature. Using non-CAT approved hydraulic fluids can cause immediate pump failure, accelerated wear, and void the warranty. Always use fresh, clean Cat-approved hydraulic oil when replacing the pump.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this is the correct pump for my excavator?\u003c\/strong\u003e\u003cbr\u003eA: Check the part number on your current hydraulic pump — if it reads 2590815 or 259-0815, this is the correct replacement. If the label is worn or missing, provide your 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 excavator 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 non-CAT approved hydraulic fluids.\u003c\/p\u003e\n\u003cp\u003eLooking for this hydraulic 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":46642192973980,"sku":"CAT-2590815","price":0.0,"currency_code":"CNY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/7385\/0524\/files\/259-08151.jpg?v=1775567074","url":"https:\/\/hepumpstore.com\/products\/cat-330d-336d-m330d-piston-pump-2590815-259-0815","provider":"HEPUMP","version":"1.0","type":"link"}