{"product_id":"16-gpm-two-stage-hydraulic-log-splitter-pump-wsd31-253","title":"16 GPM Two-Stage Hydraulic Log Splitter Pump (WSD31-253)","description":"\u003ch1\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0024\/7169\/0299\/files\/free_shipping_no_sales_tax_desc_banner.png?v=1774986479\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003e\u003cstrong\u003e6 GPM at 3,600 RPM • Automatic High\/Low Operation • 1\/2\" Keyed Shaft • Minimum 8 HP Engine\u003c\/strong\u003e\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eUpgrade or replace the hydraulic pump on a compatible log splitter with the \u003cstrong\u003eWSD31-253 Two-Stage Hydraulic Pump\u003c\/strong\u003e. The pump delivers a nominal \u003cstrong\u003e16 GPM at 3,600 RPM\u003c\/strong\u003e, providing rapid cylinder movement under low resistance before automatically shifting to lower-flow, high-pressure operation when the wedge encounters a difficult log.\u003c\/p\u003e\n\u003cp\u003eThis high\/low design allows a compatible log splitter to achieve faster cycle times and strong splitting performance without requiring the substantially larger engine associated with a comparable single-stage pump. It is designed for direct-drive use with a horizontal-shaft gasoline engine rated at \u003cstrong\u003e8 HP or greater\u003c\/strong\u003e. \u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 GPM Nominal Flow\u003c\/strong\u003e\u003cbr\u003eProvides high-volume hydraulic flow at 3,600 RPM for fast cylinder travel during the low-pressure portion of the splitting cycle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Two-Stage Operation\u003c\/strong\u003e\u003cbr\u003eThe pump automatically unloads the high-volume stage when system pressure rises, allowing the smaller stage to produce the pressure needed to split difficult wood.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster Log Splitter Cycle Times\u003c\/strong\u003e\u003cbr\u003eRapid low-pressure cylinder movement reduces waiting time between splitting strokes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with Smaller Gas Engines\u003c\/strong\u003e\u003cbr\u003eRequires a minimum 8 HP gasoline engine, allowing strong hydraulic performance without an oversized power source.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2\" Keyed Drive Shaft\u003c\/strong\u003e\u003cbr\u003eAccepts compatible pump couplers designed for a 1\/2-inch shaft and 1\/8-inch Woodruff key.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClockwise Rotation\u003c\/strong\u003e\u003cbr\u003eDesigned for clockwise operation when viewed from the drive-shaft end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Four-Bolt Mounting Pattern\u003c\/strong\u003e\u003cbr\u003eUses four mounting holes spaced 2 inches on center with a 2.83-inch bolt circle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen-Center Hydraulic Systems Only\u003c\/strong\u003e\u003cbr\u003eIntended for compatible log splitters and other equipment using an open-center control valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect-Drive Configuration\u003c\/strong\u003e\u003cbr\u003eDesigned to connect directly to a compatible engine through a properly aligned flexible coupling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Hydraulic Applications\u003c\/strong\u003e\u003cbr\u003eSuitable for compatible log splitters, hydraulic presses, clamping units, and compactors. \u003cspan class=\"\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow the Two-Stage Pump Works\u003c\/h2\u003e\n\u003cp\u003eDuring normal cylinder travel, both pump sections work together to provide approximately \u003cstrong\u003e16 GPM\u003c\/strong\u003e, moving the log splitter wedge quickly toward or away from the wood.\u003c\/p\u003e\n\u003cp\u003eWhen the wedge encounters resistance and hydraulic pressure rises, the pump automatically unloads the larger high-flow section. The smaller section continues supplying lower flow at higher pressure, allowing the splitter to develop its maximum force without stalling the engine.\u003c\/p\u003e\n\u003cp\u003eOnce resistance decreases, the pump automatically returns to high-flow operation. \u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThis 16 GPM pump is suitable for compatible:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGas-powered hydraulic log splitters\u003c\/li\u003e\n\u003cli\u003eHydraulic shop presses\u003c\/li\u003e\n\u003cli\u003eClamping equipment\u003c\/li\u003e\n\u003cli\u003eCompactors\u003c\/li\u003e\n\u003cli\u003eCustom open-center hydraulic systems\u003c\/li\u003e\n\u003cli\u003eReplacement and equipment-building projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProper compatibility depends on engine horsepower, shaft rotation, mounting pattern, coupler dimensions, port configuration, pressure requirements, and hydraulic-system design.\u003c\/p\u003e\n\u003ch2\u003eQuick Specifications\u003c\/h2\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeller SKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWSD31-253\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePump Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGP-CBN-160\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePump Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTwo-Stage High\/Low Hydraulic Gear Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal Flow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16 GPM at 3,600 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow-Pressure Stage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 13 GPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh-Pressure Stage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 3 GPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAutomatic Unloading Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400–900 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer-Published High-Pressure Maximum\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3,000 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum Engine Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGasoline, Horizontal Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrive Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDirect Drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShaft Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/2 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShaft Key\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/8 in. Woodruff Key\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRotation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClockwise, Viewed from Shaft End\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInlet Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutlet Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/2 in. NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBolt Circle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.83 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Pattern\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFour Holes, 2 in. on Center\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting-Hole Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.344 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverall Length with Shaft\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 7-1\/4 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength Without Shaft\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 5-5\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBody Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 3 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting-Surface Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 3-3\/8 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHydraulic-System Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOpen Center Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe GP-CBN manufacturer documentation identifies the pump as a 16 GPM model rated for 3,600 RPM with a 400–900 PSI unloading range and 3,000 PSI high-pressure maximum. \u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOne 16 GPM two-stage hydraulic pump\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe product page does not list a pump mount, flexible coupling, hydraulic hoses, fittings, control valve, mounting hardware, reservoir, or hydraulic fluid as included.\u003c\/p\u003e\n\u003ch2\u003eImportant Compatibility Information\u003c\/h2\u003e\n\u003cp\u003eThis pump is \u003cstrong\u003enot universal\u003c\/strong\u003e. Before ordering, verify:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngine produces at least 8 HP\u003c\/li\u003e\n\u003cli\u003eEngine operates near 3,600 RPM\u003c\/li\u003e\n\u003cli\u003eEngine has a horizontal output shaft\u003c\/li\u003e\n\u003cli\u003ePump requires clockwise rotation\u003c\/li\u003e\n\u003cli\u003eCoupling accepts a 1\/2-inch keyed pump shaft\u003c\/li\u003e\n\u003cli\u003eMounting bracket matches the four-bolt pattern\u003c\/li\u003e\n\u003cli\u003eInlet and outlet sizes match the hydraulic system\u003c\/li\u003e\n\u003cli\u003eControl valve is designed for an open-center system\u003c\/li\u003e\n\u003cli\u003eReservoir and suction hose can supply the required flow\u003c\/li\u003e\n\u003cli\u003eAll hydraulic components meet the system’s pressure requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe engine and pump shafts must be accurately aligned. Improper alignment can damage the flexible coupling, pump shaft, engine bearings, or mounting bracket.\u003c\/p\u003e","brand":"Wood Splitter Direct","offers":[{"title":"Default Title","offer_id":49141846671595,"sku":"31-253","price":159.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0024\/7169\/0299\/files\/31-253-Pump_5cac9a36-7c00-40b4-98d2-7dfa18efe988.webp?v=1785716224","url":"https:\/\/www.woodsplitterdirect.com\/products\/16-gpm-two-stage-hydraulic-log-splitter-pump-wsd31-253","provider":"Wood Splitter Direct","version":"1.0","type":"link"}