{"title":"Craftsman Marine Diesel Engine | Inboard\/Outboard Power Solutions","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e5e5; border-radius:8px;\"\u003e\n  \u003cp\u003eThis page focuses on Craftsman Marine 4-stroke diesel (approx. 42 HP class, e.g., CM4.42) inboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Craftsman Marine collection for a broader parts selection. Scroll to the bottom to start browsing parts for this engine. On the collection page, use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\" style=\"display:inline-block; padding:10px 16px; background:#0a6; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse Marine Service Kits\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 42 HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the engine nameplate\/serial tag on the engine block or rocker cover; the marine gearbox may have a separate ID plate.\u003c\/li\u003e\n    \u003cli\u003eModel codes typically indicate cylinder count and output (e.g., CM4.42 = 4-cylinder, ~42 hp). Suffixes may reflect gearbox type or configuration.\u003c\/li\u003e\n    \u003cli\u003eCheck the bracket or bell housing area for additional build plates that show ratio and rotation for the transmission.\u003c\/li\u003e\n    \u003cli\u003eDiesel 4-stroke identifiers: inline-4, natural aspiration, with a raw-water cooling circuit via heat exchanger (common on small marine diesels).\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003eInline-4 Naturally Aspirated Diesel Platform\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInline-4, 4-stroke diesel, naturally aspirated, indirect cooling via heat exchanger with raw-water pump\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eCM4.33, CM4.42 (≈42 hp), CM4.52\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eDurable platform, strong low-end torque for displacement hulls, simple maintenance schedule\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eUse marine-grade anodes and maintain the raw-water impeller; follow gearbox-specific oil specs and ratios listed on the transmission plate\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines; always follow your official service manual and local operating conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eEngine oil \u0026amp; filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eEvery 100–150 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eUse diesel-rated oil; warm the engine before draining\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\"\u003eShop Oil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003ePrimary\/secondary fuel filters\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInspect every 50 hours; replace 200–300 hours or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eDrain water separators frequently; bleed air after service\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eShop Fuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eRaw-water impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eEvery 100–200 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eReplace sooner if overheat\/weak flow is observed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/impellers\"\u003eShop Impellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eHeat-exchanger \u0026amp; block anodes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInspect every 50 hours; replace when 50% consumed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eChoose zinc\/aluminum\/magnesium to match your waters\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eShop Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eAir filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInspect every 100 hours; replace as restricted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eKeep intake free of salt\/dust buildup\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/air-filters\"\u003eShop Air Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eDrive\/alternator belts\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInspect every 50 hours; replace 200–300 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eCheck tension and glazing; carry a spare onboard\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eShop Belts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eMarine gearbox oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInitial 50 hours, then every 250 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eUse the viscosity\/spec recommended on the gearbox plate\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eShop Service Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eCharging system check (alternator)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eTest every season\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInspect belt, wiring, and output voltage under load\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/alternators\"\u003eShop Alternators\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service – \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/impellers\"\u003eImpellers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\"\u003eWater pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eAir \u0026amp; Filtration – \u003ca href=\"https:\/\/seasierra.com\/collections\/air-filters\"\u003eAir Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eElectrical \u0026amp; Charging – \u003ca href=\"https:\/\/seasierra.com\/collections\/alternators\"\u003eAlternators\u003c\/a\u003e, \u003ca href=\"https:\/\/seasierra.com\/collections\/starters\"\u003eStarters\u003c\/a\u003e, \u003ca href=\"https:\/\/seasierra.com\/collections\/rectifiers\"\u003eRectifiers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eExhaust \u0026amp; Flow – \u003ca href=\"https:\/\/seasierra.com\/collections\/elbows\"\u003eElbows\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/gaskets\"\u003eGaskets\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eOverheating or weak discharge at outlet\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eInspect raw-water strainer, intake for blockage, and impeller condition; verify hose clamps and leaks\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eWater pump impeller\/kit, hoses, intake screen, thermostat\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eCheck for air in fuel lines, drain water separator, replace clogged fuel filters; inspect glow-plug circuit and battery connections\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eFuel filters, hoses, electrical items, starter\/battery cables\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003ePoor acceleration or loss of power\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eVerify clean prop and hull; check air filter restriction, fuel filter clogging, and exhaust elbow for internal scaling\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eAir filter, fuel filters, exhaust elbow, gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eGearbox noise or metallic debris in oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eConfirm correct oil level\/spec, inspect alignment and coupler, check for prop strikes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eGaskets, oil seals, bearings (transmission service)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eLow charging voltage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eCheck belt tension, alternator output at idle\/cruise, and wiring connections\/grounds\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #eee;\"\u003eAlternator, belt, rectifier\/regulator\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"padding:16px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between CM4.33, CM4.42, and CM4.52?\u003c\/summary\u003e\n    \u003cp\u003eSome service parts (e.g., anodes, filters, belts) may cross between these inline-4 platforms, but critical items like gaskets, pumps, and gearbox components can differ. Verify by engine model\/serial and gearbox model.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the raw-water impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eInspect every 100 hours and replace every 100–200 hours or annually, whichever comes first. Replace sooner if you see reduced flow, overheating, or if the impeller shows cracks, set, or missing vanes.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should gearbox oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eAfter the first 50 hours on a new or rebuilt gearbox, then typically every 250 hours or annually. Always use the oil grade and capacity specified on the gearbox identification plate or in the gearbox manual.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide engine model and serial number, gearbox model\/ratio, photos of the nameplate, and the part you are replacing. If possible, include any casting\/part numbers found on the existing component.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px; border-top:1px solid #e5e5e5;\"\u003e\n  \u003cp\u003eReady to find what you need? Browse our marine diesel collections by category and filter by what matters to you.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\" style=\"display:inline-block; padding:10px 16px; background:#0a6; color:#fff; text-decoration:none; border-radius:6px;\"\u003eStart Browsing Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#555;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"hydro-gear-lip-seal-fits-mtd-cub-cadet-craftsman-replaces-51161-50735","title":"Hydro Gear Replacement Lip Seal – Replaces 51161 and 50735, Fits MTD, Cub Cadet \u0026 Craftsman","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eHydro Gear replacement lip seal\u003c\/strong\u003e is designed for sealing the pump shaft in compatible Hydro-Gear hydraulic pump applications. It is listed for use with BDA, BDP-10A, PE, PG, PJ, and PK Series pumps used in various riding lawn tractors and outdoor power equipment from MTD, Cub Cadet, Craftsman, Troy-Bilt, Bolens, White Outdoors, and related applications.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket replacement cross-references Hydro Gear part numbers \u003cstrong\u003e51161\u003c\/strong\u003e and \u003cstrong\u003e50735\u003c\/strong\u003e. Husqvarna part number \u003cstrong\u003e583039301\u003c\/strong\u003e is also listed as a related reference.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplacement lip seal for compatible Hydro-Gear pump shaft applications.\u003c\/li\u003e\n  \u003cli\u003eDesigned as a direct replacement when the original seal dimensions and application match.\u003c\/li\u003e\n  \u003cli\u003eHelps restore sealing performance and reduce leakage caused by a worn or damaged shaft seal.\u003c\/li\u003e\n  \u003cli\u003eSold as one replacement seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the following references to compare the replacement seal with the part being removed. Always verify the pump model and seal dimensions before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003e51161\u003c\/td\u003e\n        \u003ctd\u003eReplacement reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003e50735\u003c\/td\u003e\n        \u003ctd\u003eReplacement reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHusqvarna\u003c\/td\u003e\n        \u003ctd\u003e583039301\u003c\/td\u003e\n        \u003ctd\u003eRelated cross-reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003ePump Compatibility\u003c\/h2\u003e\n\u003cp\u003eCheck the model identification on your hydraulic pump before installation. The listed application series are:\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Hydro-Gear Pump Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel or Series\u003c\/th\u003e\n        \u003cth\u003eEquipment Application\u003c\/th\u003e\n        \u003cth\u003eRelated Part Numbers\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003eBDA Series\u003c\/td\u003e\n        \u003ctd\u003eHydraulic pumps\u003c\/td\u003e\n        \u003ctd\u003e51161, 50735\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003eBDP-10A Series\u003c\/td\u003e\n        \u003ctd\u003eHydraulic pumps\u003c\/td\u003e\n        \u003ctd\u003e51161, 50735\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003ePE Series\u003c\/td\u003e\n        \u003ctd\u003eHydraulic pumps\u003c\/td\u003e\n        \u003ctd\u003e51161, 50735\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003ePG Series\u003c\/td\u003e\n        \u003ctd\u003eHydraulic pumps\u003c\/td\u003e\n        \u003ctd\u003e51161, 50735\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003ePJ Series\u003c\/td\u003e\n        \u003ctd\u003eHydraulic pumps\u003c\/td\u003e\n        \u003ctd\u003e51161, 50735\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro Gear\u003c\/td\u003e\n        \u003ctd\u003ePK Series\u003c\/td\u003e\n        \u003ctd\u003eHydraulic pumps\u003c\/td\u003e\n        \u003ctd\u003e51161, 50735\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe seal is also associated with equipment using Hydro-Gear hydraulic systems, including applications from MTD, Cub Cadet, Craftsman, Troy-Bilt, Bolens, White Outdoors, and Husqvarna. Brand and equipment compatibility alone does not confirm fitment; match the pump model, original part reference, and dimensions.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eHydraulic lip seal\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eDirect replacement for a matching original seal\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n  \u003cdd\u003e17 x 40 x 7 mm (inner diameter x outer diameter x width)\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003ePolyethylene (PE)\u003c\/dd\u003e\n  \u003cdt\u003eColor\u003c\/dt\u003e\n  \u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n  \u003cdd\u003e0.025 kg (0.88 oz)\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eHydraulic pump shaft sealing\u003c\/dd\u003e\n  \u003cdt\u003eReplacement References\u003c\/dt\u003e\n  \u003cdd\u003eHydro Gear 51161 and 50735; related Husqvarna reference 583039301\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Hydro Gear replacement lip seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eTurn off the equipment and safely depressurize the hydraulic system before beginning work.\u003c\/li\u003e\n  \u003cli\u003eClean the area around the old seal to prevent dirt and debris from entering the pump.\u003c\/li\u003e\n  \u003cli\u003eRemove the worn seal with a suitable seal puller, taking care not to scratch the shaft or housing bore.\u003c\/li\u003e\n  \u003cli\u003eInspect the shaft and housing for grooves, burrs, or excessive wear. Correct any underlying damage before installing the replacement.\u003c\/li\u003e\n  \u003cli\u003eLightly lubricate the inner and outer sealing surfaces with clean hydraulic fluid, where appropriate for the pump manufacturer’s service procedure.\u003c\/li\u003e\n  \u003cli\u003ePosition the seal squarely in the housing and press it into place with a suitable seal driver or socket that applies even pressure to the correct outer surface.\u003c\/li\u003e\n  \u003cli\u003eReassemble the pump or related components, restore the hydraulic fluid to the proper level, and check carefully for leaks during operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm that this lip seal fits my mower?\u003c\/summary\u003e\n  \u003cp\u003eIdentify the Hydro-Gear pump model or series on your equipment and compare the original seal with the listed dimensions and reference numbers. This replacement is associated with BDA, BDP-10A, PE, PG, PJ, and PK Series pump applications and references Hydro Gear 51161 and 50735. Equipment brand alone is not sufficient to confirm fitment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing hydraulic seal?\u003c\/summary\u003e\n  \u003cp\u003eThe most common sign is hydraulic fluid leakage around the pump shaft. Loss of transmission performance, unusual pump noise, or sluggish hydraulic operation may also indicate a seal or another hydraulic-system problem.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should the seal be replaced?\u003c\/summary\u003e\n  \u003cp\u003eThere is no universal replacement interval. Replace the seal when leakage, damage, or wear is found, and consider replacing it during a pump or transmission overhaul when the seal is accessible.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I install this seal myself?\u003c\/summary\u003e\n  \u003cp\u003eInstallation may be suitable for an experienced technician with the correct puller, seal driver, and service information. Incorrect alignment or installation force can damage the seal, shaft, or housing, so professional installation is recommended when the pump service procedure is unfamiliar.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for an aftermarket replacement lip seal. The listed Hydro Gear and Husqvarna numbers are reference numbers used to help compare the replacement with the original part.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow quickly is the order shipped?\u003c\/summary\u003e\n  \u003cp\u003eTypical international transit is 5–15 days. Standard shipping is free, and expedited options may be available at checkout depending on the destination.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the warranty and return terms?\u003c\/summary\u003e\n  \u003cp\u003eThe product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the applicable standard return window when the item is unused and in its original condition. Contact support with your order details for assistance.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the pump model, original part reference, dimensions, and installation orientation before ordering.\u003c\/li\u003e\n  \u003cli\u003eDo not install a seal if the shaft or housing is excessively worn or damaged without correcting the underlying problem.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eFollow the equipment and pump manufacturer’s service instructions and use appropriate personal protective equipment.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when working on pressurized hydraulic systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply replacement parts selected for dependable performance in real-world equipment applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery is available to most regions, typically within 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising material selection or quality-control practices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717906141499,"sku":"3813R","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/3813R.png?v=1762938076"}],"url":"https:\/\/seasierra.com\/collections\/craftsman-marine-diesel-engine-inboard-outboard-power-solutions.oembed","provider":"SeaSierra","version":"1.0","type":"link"}