{"product_id":"26-830749a01-seal-kit-lower-gearcase-for-mercury-mariner-force-verado-jlm-marine","title":"26-830749A01 Seal Kit Lower Gearcase for Mercury Mariner Force Verado | JLM Marine","description":"\u003ch2\u003eSeal Kit Lower Gearcase for Mercury Mariner Force Verado 135-300HP | 26-830749A01\u003c\/h2\u003e\n\n\u003cp\u003eThis lower gearcase seal kit is engineered for Mercury, Mariner, and Force Verado outboards from \u003cstrong\u003e135 HP to 300 HP\u003c\/strong\u003e, covering \u003cstrong\u003e4-cylinder and 6-cylinder FourStroke models\u003c\/strong\u003e from \u003cstrong\u003e2005 to current\u003c\/strong\u003e. Designed to fit the \u003cstrong\u003e4.80-inch Torpedo gearcase\u003c\/strong\u003e, it ensures reliable sealing and protection for your lower unit in demanding marine environments.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket seal kit directly replaces OEM part number \u003cstrong\u003e26-830749A01\u003c\/strong\u003e and cross-references with Sierra 18-2725, GLM 87515, and Mallory 95-221-11K. It provides a complete sealing solution for routine maintenance or gearcase rebuild projects.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFits \u003cstrong\u003e200\/225\/250\/275 HP FourStroke Verado\u003c\/strong\u003e outboards beginning with Model Year 2005\u003c\/li\u003e\n  \u003cli\u003eComplete seal kit includes all components shown in product images\u003c\/li\u003e\n  \u003cli\u003eCompatible with \u003cstrong\u003e4.80-inch Torpedo gearcase\u003c\/strong\u003e configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury \/ Mariner \/ Force\u003c\/td\u003e\n      \u003ctd\u003e26-830749A01\u003c\/td\u003e\n      \u003ctd\u003eOEM\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra\u003c\/td\u003e\n      \u003ctd\u003e18-2725\u003c\/td\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGLM\u003c\/td\u003e\n      \u003ctd\u003e87515\u003c\/td\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMallory\u003c\/td\u003e\n      \u003ctd\u003e95-221-11K\u003c\/td\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" target=\"_blank\" rel=\"nofollow noopener\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" target=\"_blank\" rel=\"nofollow noopener\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner \/ Force\u003c\/td\u003e\n        \u003ctd\u003eVerado FourStroke\u003c\/td\u003e\n        \u003ctd\u003e135-300 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2005-Current\u003c\/td\u003e\n        \u003ctd\u003e4.80 inch Torpedo gearcase\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury \/ Mariner \/ Force\u003c\/td\u003e\n        \u003ctd\u003eVerado FourStroke\u003c\/td\u003e\n        \u003ctd\u003e200\/225\/250\/275 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2005+\u003c\/td\u003e\n        \u003ctd\u003e4 \u0026amp; 6 cylinder models\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e26-830749A01\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGearcase Type\u003c\/td\u003e\n      \u003ctd\u003e4.80 inch Torpedo Lower Gearcase\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eLower Unit Seal Kit\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFitment\u003c\/td\u003e\n      \u003ctd\u003eMercury, Mariner, Force Verado 135-300 HP FourStroke\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis seal kit includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e1x Gearcase Seal Kit\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003eThe package contains all the parts shown in the product images\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and raise the outboard to full tilt position. Remove the lower unit from the motor following your service manual procedures.\u003c\/li\u003e\n  \u003cli\u003eDrain all gear oil completely and clean the gearcase exterior. Remove the propeller, propeller shaft, and carrier assembly.\u003c\/li\u003e\n  \u003cli\u003eCarefully remove all old seals, gaskets, and O-rings from the gearcase housing and shafts. Clean all mating surfaces thoroughly, removing residue and corrosion.\u003c\/li\u003e\n  \u003cli\u003eInspect all seal surfaces for scoring, pitting, or wear that may prevent proper sealing. Replace any damaged components as necessary.\u003c\/li\u003e\n  \u003cli\u003eApply marine-grade grease to new seal lips before installation. Install new seals with the lip facing the correct direction per your service manual.\u003c\/li\u003e\n  \u003cli\u003eInstall O-rings and gaskets in their proper locations, ensuring they seat evenly without twisting or pinching. Do not reuse old seals or gaskets.\u003c\/li\u003e\n  \u003cli\u003eReassemble the propeller shaft and carrier assembly, ensuring proper bearing alignment. Torque all fasteners to manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit onto the motor, aligning the shift shaft carefully. Secure all mounting bolts to the specified torque.\u003c\/li\u003e\n  \u003cli\u003eRefill the gearcase with the manufacturer-recommended gear oil type and quantity. Check for proper oil level through the vent and fill plugs.\u003c\/li\u003e\n  \u003cli\u003eRun the engine in a test tank or on the water, checking for leaks around all seal areas. Monitor gear oil level after initial run and top off if needed.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this seal kit fits my Mercury Verado outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine's HP rating (135-300 HP), model year (2005 or newer), and confirm it has the 4.80-inch Torpedo gearcase. Cross-reference your original OEM part number 26-830749A01 with the product listing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my lower unit seals need replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include milky or discolored gear oil (water contamination), visible oil leaks around the lower unit, excessive gear noise, or oil level dropping between services. Replace seals immediately if water intrusion is detected.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the lower gearcase seals?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace seals during major lower unit service (typically every 3-5 years or 300-500 hours), whenever the lower unit is disassembled for repair, or immediately if leaks or water contamination are observed during routine oil changes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this seal kit myself or do I need a mechanic?\u003c\/strong\u003e\u003cbr\u003e\nA: Installation requires disassembly of the lower unit, proper seal installation techniques, and torque specifications. If you have mechanical experience and the proper service manual, DIY installation is possible; otherwise, professional installation is strongly recommended.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit include all seals needed for a complete lower unit rebuild?\u003c\/strong\u003e\u003cbr\u003e\nA: This kit contains all seals and gaskets shown in the product images for the lower gearcase. Verify the components against your service manual to ensure complete coverage for your specific rebuild needs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between this aftermarket seal kit and the OEM version?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981022167353,"sku":"24MSK718","price":41.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_ee1d1a48-6734-4f42-a6f5-b492e0f73f1a.jpg?v=1772414730","url":"https:\/\/jlmmarine.com\/es\/products\/26-830749a01-seal-kit-lower-gearcase-for-mercury-mariner-force-verado-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}