A four-post lift is the most forgiving used-lift purchase you can make — the load sits on runways, not on arms, and a four-post never has to balance a vehicle on four small contact pads. That said, a four-post has four corner cables instead of one power cable, and if any one of those four is neglected, the whole lift is unsafe. When someone calls us about a used 4 post lift for sale, this is exactly the walk we do before we say yes.
Storage lift or service lift?
Every used 4 post lift for sale falls into two big families. Home-storage and light-service units are typically 7,000 to 9,000 lb, on aluminum-look runways with basic locks and no jack-tray provisions. Commercial-service four-posts are usually 12,000 to 30,000 lb, with heavier runways, drive-on ramps, air-release locks, and rails machined to accept a sliding bridge jack. If the used 4 post lift for sale is being pitched as commercial and it is actually a storage lift, the capacity and duty-cycle are not what you think. Read the data plate.
Corner cables and sheaves
This is the single most important inspection on any used 4 post lift for sale. Four cables run from one hydraulic cylinder through sheaves at the top of each column to the four corners of the runways — they are what actually lift the car. Every cable has to be inspected for broken strands, corrosion, and correct routing through each sheave. Any one broken strand condemns the cable, and cables are always replaced as a matched set. Sheaves themselves develop grooves; a sharp lip on a sheave eats new cable. Add fresh cables and sheaves to your budget if the lift has been sitting or has visible wear.
Hydraulic cylinder, hoses, and equalizer
Four-posts run one cylinder. Look at the rod for pitting, the cylinder body for weep, and the cushion at each end for any sign of impact damage. Trace the pressure hose from the power unit to the cylinder — hoses that live on the ground get run over, and a hose failure under load is exactly the failure your locks are there for. Confirm the equalizer system (either cable-and-sheave or a mechanical link) keeps all four corners level to spec. If the runways sit visibly off-level at rest, the equalizer needs attention.
Rollers, runways, and ramps
Walk both runways from end to end. Look for cracks in welds near the pivot points at the ramp end, look for gouging where drive-on ramps land, and look at the ramp pivot pins. Rollers under the runways (on the columns) should turn freely; frozen rollers scar the runway rails and eventually catch. Check the drive-on ramp latches — on a service lift, they lift into a “wheel stop” position; on a storage lift, they may fold flat. Bent or seized ramps are common and often not sold as spares individually.
Locks and safety latches
Four-posts use mechanical safety locks at each column. Cycle the lift up through every position — every lock at every column must engage cleanly. Then cycle it down through the release. Watch and listen. On air-release lifts, watch the air cylinders retract each lock evenly. If one column drops before the others when you hit release, the pneumatic system needs attention. A four-post without working locks is not a four-post; it is a hydraulic system waiting to leak.
Sliding bridge jacks
If the lift is being sold with sliding bridge jacks, cycle them the full length of the runways. Look for clean roller travel, working jaw hooks on both sides, and a healthy jack — either air-over-hydraulic or hand pump. Bridge jacks are what turn a four-post into a real service lift for tires, brakes, and alignment; a lift with dead jacks is worth noticeably less. Also confirm the runway rails on the specific lift model actually accept the jack you are being sold — not every bridge jack fits every rail.
Anchoring and level
Four-post lifts are typically not anchored to concrete in the way two-posts are (some are, most are not). But they still need a level slab. Manufacturers publish a level spec — typically within 1/4 to 1/2 inch across the footprint — and going outside it causes the runways to load unevenly on the cables. Check the destination slab before you buy the lift.
Move and install cost
A used 4 post lift for sale is heavier than it looks. Runways alone are usually 500 to 900 lb each. Columns can be 400 to 800 lb each. You need a trailer, forks or a telehandler on both ends, and a plan. Cables are typically pulled and re-run at reinstall, and the hydraulic system will need to be re-bled. A lot of buyers save $2,500 on a used 4 post lift for sale and then spend $2,000 moving and installing it — the math still works, but only if you count the whole number.
Get it inspected
Before you buy, get eyes on it. Our lift inspection service walks all four cables, the cylinder, hoses, locks, rollers, ramps, and jacks against the manufacturer’s spec, with a written report. If it fails, we would rather tell you before the check is written. If you would like to compare against a new unit with warranty and current controls, our four-post buying guide and four-post lift collection give you real apples-to-apples numbers after install.
Rule of thumb on price
A named-brand used four-post in solid running order with working jacks is worth roughly 45 to 60 percent of new-with-install. Below 45 percent, expect a repair or missing jacks. Above 65 percent, buy new. If you are staring at a used 4 post lift for sale and want a second opinion, send us the data plate, a photo of each cable termination, and a photo of the runways.
Call our install team at 800-674-9302. We will help you evaluate what you found, quote an inspection, or price a new four-post delivered and installed. You can also head back to the home page to see the rest of the shop.
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