{"product_id":"hydro-gear-lip-seal-fits-bda-bdp-10a-pe-pg-pj-pk-series-pumps-replaces-51161-50735","title":"Hydro Gear Lip Seal – Fits BDA, BDP-10A, PE, PG, PJ, PK Series Pumps (Replaces 51161, 50735)","description":"\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 Hydro Gear Lip Seal is a direct-fit replacement for BDA, BDP-10A, PE, PG, PJ, and PK Series Pumps used in residential and commercial lawn equipment. Measuring 17 × 40 × 7 mm, this seal ensures proper containment and extends the service life of your hydrostatic transmission across Hydro-Gear, MTD, Cub Cadet, MTD Pro, Troy Bilt, Bolens, Craftsman, and White Outdoors machines.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket seal directly replaces Hydro Gear part numbers 51161 and 50735, offering a reliable and cost-effective solution for routine maintenance or transmission repair.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision-molded construction for consistent fitment across multiple pump series\u003c\/li\u003e\n  \u003cli\u003eDesigned for use in residential and commercial hydrostatic transmission systems\u003c\/li\u003e\n  \u003cli\u003eIncludes one seal ready for installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\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\u003eNotes\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\u003ePrimary OEM 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\u003eAlternate OEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\/Series\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\u003eHydro-Gear\u003c\/td\u003e\n        \u003ctd\u003eBDA\u003c\/td\u003e\n        \u003ctd\u003ePump series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro-Gear\u003c\/td\u003e\n        \u003ctd\u003eBDP-10A \u0026amp; PE\u003c\/td\u003e\n        \u003ctd\u003ePump series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro-Gear\u003c\/td\u003e\n        \u003ctd\u003ePG\u003c\/td\u003e\n        \u003ctd\u003ePump series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro-Gear\u003c\/td\u003e\n        \u003ctd\u003ePJ\u003c\/td\u003e\n        \u003ctd\u003ePump series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHydro-Gear\u003c\/td\u003e\n        \u003ctd\u003ePK Series Pumps\u003c\/td\u003e\n        \u003ctd\u003ePump series\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMTD\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCub Cadet\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMTD Pro\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eTroy Bilt\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eBolens\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCraftsman\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eWhite Outdoors\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003eEquipped with compatible Hydro-Gear pumps\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eSeal Dimensions\u003c\/dt\u003e\n  \u003cdd\u003e17 × 40 × 7 mm\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eHydrostatic transmission pumps\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Pump Series\u003c\/dt\u003e\n  \u003cdd\u003eBDA, BDP-10A, PE, PG, PJ, PK\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eDurable elastomer compound\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n  \u003cdd\u003e1 year\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e1 × Lip Seal\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDrain all hydraulic fluid from the pump housing and relieve system pressure before beginning work.\u003c\/li\u003e\n  \u003cli\u003eRemove the pump assembly from the unit according to your equipment's service manual.\u003c\/li\u003e\n  \u003cli\u003eCarefully extract the old seal using a seal puller or flat blade, taking care not to damage the shaft or housing bore.\u003c\/li\u003e\n  \u003cli\u003eClean the seal bore and shaft thoroughly with a lint-free cloth and solvent to remove debris, oil residue, and corrosion.\u003c\/li\u003e\n  \u003cli\u003eInspect the shaft surface for scoring, pitting, or wear that could compromise the new seal.\u003c\/li\u003e\n  \u003cli\u003eApply a thin coat of clean hydraulic oil to the new seal lip and outer diameter.\u003c\/li\u003e\n  \u003cli\u003ePosition the seal with the lip facing inward (toward the fluid side) and press it evenly into the bore using a seal driver or appropriate socket.\u003c\/li\u003e\n  \u003cli\u003eEnsure the seal is fully seated and flush with the housing surface.\u003c\/li\u003e\n  \u003cli\u003eReassemble the pump, refill with manufacturer-recommended hydraulic fluid, and bleed air from the system per your service manual.\u003c\/li\u003e\n  \u003cli\u003eTest operation at low speed and check for leaks before returning to full service.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my lip seal needs replacement?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include hydraulic fluid leaking from the pump shaft area, loss of hydrostatic drive power, and visible oil residue around the seal housing. If you notice reduced responsiveness or intermittent drive engagement, inspect the seal for wear or damage.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse the old seal if it looks intact?\u003c\/summary\u003e\n  \u003cp\u003eNo. Lip seals are single-use components. Even if the seal appears undamaged, removal distorts the sealing lip and compromises its ability to maintain hydraulic pressure. Always install a new seal during pump service.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat happens if the seal is installed backward?\u003c\/summary\u003e\n  \u003cp\u003eInstalling the seal with the lip facing outward will cause immediate hydraulic fluid leakage and loss of pump function. Always confirm the lip faces the fluid side before pressing the seal into place.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDo I need to apply sealant or adhesive?\u003c\/summary\u003e\n  \u003cp\u003eNo. A properly sized lip seal requires only a light coat of clean hydraulic oil on the sealing lip and outer diameter. Sealants or adhesives can interfere with seal flexibility and may cause installation damage.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this seal fit all Hydro-Gear pumps?\u003c\/summary\u003e\n  \u003cp\u003eThis seal is sized for BDA, BDP-10A, PE, PG, PJ, and PK series pumps. Other Hydro-Gear models may use different seal dimensions. Always cross-reference your pump model and original part number before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace the lip seal?\u003c\/summary\u003e\n  \u003cp\u003eReplace the seal whenever the pump is disassembled for service, or immediately if you observe fluid leakage. In high-hour commercial applications, inspect the seal annually as part of routine transmission maintenance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025915445563,"sku":"3813","price":11.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_d2454562-bfbc-43e1-b0ac-3a8d58fec718.jpg?v=1772975130","url":"https:\/\/seasierra.com\/products\/hydro-gear-lip-seal-fits-bda-bdp-10a-pe-pg-pj-pk-series-pumps-replaces-51161-50735","provider":"SeaSierra","version":"1.0","type":"link"}