{"product_id":"challenger-6-3900-cylinder-assembly-locking","title":"Challenger 6-3900 Cylinder Assembly Locking","description":"\u003cp\u003eThe \u003cstrong\u003eChallenger 6-3900 hydraulic cylinder\u003c\/strong\u003e is the direct replacement for the Challenger lift it came off of. This is the genuine Challenger part — same fit and same working specification as the one already on your lift. Ordering the Challenger hydraulic cylinder from us gets you the OEM piece that matches the lift, not an aftermarket knock-off that is close but not the same.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 6-3900\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Challenger\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Genuine OEM hydraulic cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNot every hydraulic problem is the cylinder. A lift that lowers itself overnight usually has a lowering valve that won't seat or a leaking check, not a bad seal. A lift that jerks or won't reach full height can be a tired pump or a flow valve out of adjustment. And a hose that's cracked near the crimp will spray under pressure — a real hazard, not just a mess to mop up.\u003c\/p\u003e\n\u003cp\u003eThe power unit bundles the motor, pump, reservoir, and valves into one hangable box, usually bolted to a column or a pump stand. Press up and the motor spins the pump, which draws fluid from the reservoir and sends it to the cylinder; release, and the dump valve routes it back. The single spec that matters most is voltage — 110 versus 220 — because the wrong one turns the whole unit into a paperweight.\u003c\/p\u003e\n\n\n\u003ch3\u003eRelated parts for this lift\u003c\/h3\u003e\n\u003cp\u003eThe parts below are commonly ordered alongside this one — cables, sheaves, seals, and hardware wear on similar schedules, and most repairs go faster when the whole set is done in one visit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/challenger-6-0651-locking-cylinder\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003eChallenger 6-0651 Locking Cylinder\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/challenger-6-3883-cylinder-assembly-locking\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003eChallenger 6-3883 Cylinder Assembly Locking\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/challenger-6-3933-c-pin-for-ncm-cylinder\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003eChallenger 6-3933 C Pin for Ncm Cylinder\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/challenger-6-3989-safety-cylinder\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003eChallenger 6-3989 Safety Cylinder\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\u003ch3\u003eReplacing your hydraulic cylinder\u003c\/h3\u003e\n\u003cp\u003eReplacing a hydraulic cylinder comes down to relieving all pressure, capping the lines so nothing gets contaminated, getting the old cylinder out and the new one in, then bleeding the air and leak-checking under load. The exact removal path differs by lift style, and skipping the bleed leaves the lift spongy. Because a cylinder holds a vehicle in the air, the full procedure is worth following start to finish. \u003cstrong\u003eFull step-by-step: \u003ca href=\"https:\/\/autoliftserv.com\/articles\/how-to-replace-a-2-post-lift-cylinder\/\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003ehow to replace a 2-post lift cylinder\u003c\/a\u003e.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFind the right part for your lift\u003c\/h3\u003e\n\u003cp\u003eLanded here but not 100% sure it is your part? Grab the model and serial from the data plate and \u003ca href=\"https:\/\/store.autoliftserv.com\/pages\/parts-lookup#mfr=challenger\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003eopen our Challenger parts lookup\u003c\/a\u003e for the visual breakdown — the manufacturer-style drawing with every item numbered so you can match yours exactly. Plate missing? \u003ca href=\"https:\/\/autoliftserv.com\/articles\/how-to-find-car-lift-model-number\/\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003eour guide to finding your model number\u003c\/a\u003e helps, and we identify lifts from photos every week if you would rather ask.\u003c\/p\u003e\n\n\u003ch3\u003eSigns of a hydraulic problem\u003c\/h3\u003e\n\u003cp\u003ePull the reservoir cap and look at the fluid. Clear amber (or clean red for ATF) is good; milky or foamy means water has gotten in and the pump is aerating; dark and gritty means the system is wearing and the filter is loading up. Fluid condition tells you as much about the hydraulic health of the lift as any single part will.\u003c\/p\u003e\n\n\u003ch3\u003eParts commonly replaced at the same time\u003c\/h3\u003e\n\u003cp\u003eHydraulic parts travel in company: a leaking cylinder often needs a seal kit, a tired hose, and a fluid change all at once. Since you are relieving pressure and bleeding anyway, do the related wear items in the same visit. Tell us your model and we will pull the matching seals, hose, and oil.\u003c\/p\u003e\n\n\u003ch3\u003eHydraulic fluid\u003c\/h3\u003e\n\u003cp\u003eFluid matters on any hydraulic repair: most lifts take an \u003cstrong\u003eISO-32\u003c\/strong\u003e hydraulic oil, though a number of older ones spec \u003cstrong\u003eDexron ATF\u003c\/strong\u003e. Match whatever is already in the reservoir rather than mixing types, and top off to the level your manual specifies after bleeding — capacities differ from model to model.\u003c\/p\u003e\n\n\u003ch3\u003eSafety notes\u003c\/h3\u003e\n\u003cp\u003eThe failure mode that hurts people is slow drift-down from a bad seal or trapped air, so never leave a hydraulic repair half-bled. Support the lift on its mechanical locks while you work, relieve pressure before opening the system, and cycle it several times empty — watching for drift — before a vehicle goes on it.\u003c\/p\u003e\n\n\u003ch3\u003eBefore you order\u003c\/h3\u003e\n\u003cp\u003eA little prep prevents a wrong order: confirm model and serial, measure hoses and note fitting sizes, and check whether a reseal solves it before buying a complete cylinder. Budget for oil and bleeding as part of the repair. We will confirm the right part for your production run before it ships.\u003c\/p\u003e\n\n\u003ch3\u003eOrdering the right revision\u003c\/h3\u003e\n\u003cp\u003eBefore this goes in the cart, grab two things off your lift: the model number and the serial number, both on the manufacturer's plate. The serial matters more than most people expect — lift makers revise components between production runs without renaming the lift, and the run your serial falls in determines which revision of this part is correct.\u003c\/p\u003e\n\u003cp\u003eIf you are working from a failed part rather than a plate, measure what you have and photograph how it mounts. Send that to us along with the lift brand, and we will check it against the same parts breakdowns our own techs use in the field before you commit to the order.\u003c\/p\u003e\n\n\u003ch3\u003eWhy buy your Challenger hydraulic cylinder from Auto Lift Services\u003c\/h3\u003e\n\u003cp\u003eWe install, inspect, and repair Challenger lifts every week — the 6-3900 is a part we handle in the shop, not a random SKU we drop-ship. The phone answers if you have a question mid-install — call \u003ca href=\"tel:8006749302\" style=\"color:#0b5a9c;text-decoration:underline;\"\u003e800-674-9302\u003c\/a\u003e — and every part ships genuine, no aftermarket substitution unless you ask for it.\u003c\/p\u003e\n\n\u003c!-- als-scaleup-v3 --\u003e","brand":"Challenger","offers":[{"title":"Default Title","offer_id":47704233672957,"sku":"6-3900","price":132.62,"currency_code":"USD","in_stock":true}],"url":"https:\/\/store.autoliftserv.com\/products\/challenger-6-3900-cylinder-assembly-locking","provider":"Automotive Lift Services","version":"1.0","type":"link"}