The Challenger 40673 hydraulic cylinder 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.

Specifications

• Part number: 40673
• Brand: Challenger
• Type: Genuine OEM hydraulic cylinder

Hydraulic parts almost always fail by leaking. A rod seal starts weeping and the cylinder body goes wet; a hose cracks near its crimp; a fitting's o-ring flattens; the lowering valve stops seating and the lift drifts down overnight. Fluid finds the weakest seal in the loop and pushes past it. The symptom — a puddle, a slow sag, a spongy lift — tells you roughly where in the loop to look.

Not 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.

Related parts for this lift

The 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.

• Challenger 40673 Cylinder Pull Bar (4015)

Replacing your hydraulic cylinder

Replacing 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. Full step-by-step: how to replace a 2-post lift cylinder.

Find the right part for your lift

If you are not sure this part matches your setup, the fastest check is the visual breakdown: open our Challenger parts lookup, pick your model, and match your part against the drawing where every item is numbered. Can't read the model plate? our guide to finding your model number shows exactly where it lives on each lift type, and we are a phone call away if you would rather have us confirm it.

Signs of a hydraulic problem

Inspect every hose end to end. You're looking for cracked or brittle covers, blisters, weeping at the crimped fittings, and any spot rubbing a cable or bracket. A hose that's damp near the crimp is about to let go there. Squeeze it — a healthy hose is firm, an old one goes hard and checked or soft and mushy. Either extreme means replace it.

Parts commonly replaced at the same time

Hydraulic 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.

Hydraulic fluid

Fluid matters on any hydraulic repair: most lifts take an ISO-32 hydraulic oil, though a number of older ones spec Dexron ATF. 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.

Safety notes

The 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.

Before you order

A 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.

Ordering the right revision

Before 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.

If 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.

Why buy your Challenger hydraulic cylinder from Auto Lift Services

We install, inspect, and repair Challenger lifts every week — the 40673 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 800-674-9302 — and every part ships genuine, no aftermarket substitution unless you ask for it.