{"product_id":"bucher-pm-3551-hpu","title":"Bucher 2-Way Hydraulic Power Unit | 2 gal Poly","description":"\u003cp\u003eThe Bucher PM-3551 2-Way Hydraulic Power Unit is a 12V double-acting HPU with a 2-gallon high-density polyethylene reservoir. It powers cylinders both up and down — so it handles dump beds, lift gates, scissor lifts, and any application where gravity won't bring the load back. 3,250 PSI relief, 1.5 GPM peak flow.\u003c\/p\u003e\n\u003ch4\u003eWhen do I need a 2-way HPU instead of a power-up \/ gravity-down unit?\u003c\/h4\u003e\n\u003cp\u003eUse a 2-way (also called double-acting) HPU any time the cylinder needs to retract under load — closing a tailgate against wind, lowering a lift gate with no weight on it, or holding a position mid-stroke. A power-up \/ gravity-down unit is fine when gravity does the work coming down, but it can't push the cylinder back.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e12V DC, 2-Way (Power Up \/ Power Down) — double-acting\u003c\/li\u003e\n\u003cli\u003e2-gallon high-density polyethylene reservoir\u003c\/li\u003e\n\u003cli\u003e3,250 PSI operational pressure\u003c\/li\u003e\n\u003cli\u003e1.5 GPM max oil flow\u003c\/li\u003e\n\u003cli\u003e#6 SAE hose connections\u003c\/li\u003e\n\u003cli\u003eOperating temp: -20°F to 130°F\u003c\/li\u003e\n\u003cli\u003eRecommended fluid: ATF (Automatic Transmission Fluid)\u003c\/li\u003e\n\u003cli\u003eBucher PM-3551 — made in USA, 100% tested\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor a compact 3-quart variant of this same circuit, see the \u003ca href=\"\/products\/bucher-pump-2-way-hpu\"\u003eBucher 2-Way HPU (PM-3551-0667)\u003c\/a\u003e. For lift-only jobs where gravity does the return stroke, see the \u003ca href=\"\/products\/bucher-power-gravity-down\"\u003eBucher Power-Up \/ Gravity-Down HPU\u003c\/a\u003e.\u003c\/p\u003e","brand":"Bucher Hydraulics, Inc.","offers":[{"title":"Default Title","offer_id":43147732123900,"sku":"PM-3551","price":641.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/6276\/5820\/files\/bucher-pump-2-way-power-up-down-hydarulic-power-un-bg-removed-14.webp?v=1776354572","url":"https:\/\/www.piercearrowinc.com\/products\/bucher-pm-3551-hpu","provider":"PIERCE ","version":"1.0","type":"link"}