If you run a rotary two post lift in a shop doing heavy suspension and shock replacement, you already know the cylinder takes a beating. We get calls almost every week from tire and alignment shops in and around Urbandale describing the same thing: the lift used to raise smooth, and now there’s a slow drip of hydraulic fluid pooling under the arm, or the platform sinks a half inch after it’s raised. That’s almost always a cylinder seal problem, and it’s fixable without buying a whole new lift. Auto Lift Services installs, services, and stocks seal kits for rotary lifts across Iowa, and we want you to know exactly what to check before you call us.
Look up the correct rebuild kit by lift model and serial number, or give us a call and we’ll match the part for you before you order.
Why Suspension Shops Wear Out Rotary Two Post Lift Cylinders Faster
Shops that specialize in suspension and shock work put a different kind of stress on a rotary two post lift than a general repair bay. You’re not just raising a car to swap oil, you’re holding it up for extended periods while pulling struts, cycling the arms to get clearance on control arms, and sometimes bouncing the vehicle on the lift to check ride height. That repeated cycling and holding under load pushes the cylinder seals harder than a quick oil change ever would.
Over time, the seals lose their ability to hold pressure evenly, and you start to see fluid weeping down the cylinder body or collecting at the base. We’ve had shop owners tell us the lift was fine for years and then started leaking right around the time their shock and strut volume picked up. It’s not a coincidence. If you’re running high volume suspension work on a rotary two post lift, plan on inspecting the cylinder seals annually instead of waiting for a visible puddle. Catching a worn seal early means a rebuild kit instead of a full cylinder replacement.
What a Leaking Rotary Two Post Lift Cylinder Actually Looks Like
We had a shop call us about a rotary lift we’d installed a few years earlier where the cylinder was leaking and the owner planned to stop by and pick up seals himself rather than wait for a service call. That’s a common path for shops that are comfortable doing their own wrench work, and it’s a fine option if you’re mechanically confident. The tell-tale signs are fluid on the floor under the post, a lift that settles slightly after reaching full height, or a jerky, uneven rise instead of a smooth lift.
Another shop we service had blown a seal on a rotary lift after having both cylinders replaced the year before, and the fluid was leaking everywhere by the time they called. That’s the scenario you want to avoid. Once a seal fully fails rather than just weeping, you can lose enough fluid fast enough that the lift becomes unsafe to use with a vehicle on it. If you notice any drop in lift performance on your rotary two post lift, don’t wait for it to get worse. A small weep today is a seal kit; a full blowout tomorrow can mean downtime you didn’t plan for.
Safety First: Never Run a Rotary Two Post Lift With a Suspected Seal Leak
We say this to every shop owner who calls us about a leak: stop using the lift with a vehicle on it until it’s inspected. A rotary two post lift relies on consistent hydraulic pressure to hold a vehicle safely at height, and a compromised seal means that pressure isn’t guaranteed to stay where it should. If a car is up in the air for shock and strut work and the cylinder starts losing fluid, the platform can settle unevenly, which is dangerous for anyone working underneath.
This matters even more in a suspension-focused shop because technicians are frequently under the vehicle removing and reinstalling load-bearing components. There’s no room for the lift to shift while someone has a strut half-disconnected. Set the safety locks every time, and if you see any fluid on the floor or notice the lift isn’t holding height the way it used to, take it out of service and inspect the cylinder before putting another vehicle on it. It’s a lot cheaper to lose a day to a seal kit than to deal with an accident in the bay.
Hydraulic Cylinder Seals and Rebuild Kits: What’s Actually Involved
Rebuilding a rotary two post lift cylinder is usually more approachable than shops expect. A rebuild kit typically includes the piston seal, rod seal, wiper, and O-rings sized to your specific cylinder, and getting the right kit depends on knowing your lift’s exact model and, ideally, the serial number. We keep records of what we’ve installed at shops across Iowa, so if we put your rotary lift in, we can usually pull up the model and cylinder spec without you having to dig through paperwork.
The process itself involves draining the cylinder, removing it from the post, disassembling the piston, cleaning the bore, installing the new seals, and bleeding the system once it’s reassembled. Some shop owners handle this themselves once they have the kit in hand; others prefer to have us send a technician out to do the full teardown and rebuild on site. Either way works, and we stock seal kits for the rotary models most common in Iowa shops so you’re not waiting weeks on a backorder while your lift sits down.
Ordering the Right Parts the First Time
Getting the wrong seal kit is one of the most common delays we see. Rotary has made changes to cylinder specs and part numbers over different model years, and manufacturers have also had software and order processing delays that push back ship dates on legitimate orders. That means guessing at a part number off a catalog picture can cost you a second shipment and another week of downtime. We ask for the model number and serial number every time so we’re ordering the exact kit your rotary two post lift needs.
If you’re not sure where to find that information, it’s usually stamped on a plate near the base of the post or on the power unit housing. Take a photo of it before you call. We can also walk you through it over the phone if you’re standing next to the lift. Getting the part number right the first time is the single biggest thing you can do to minimize downtime on a busy suspension bay.
Freight, Lead Time, and Getting Your Shop Back Up Fast
Once we’ve confirmed the correct seal kit for your rotary two post lift, the next question is always how fast it can get to your shop. Lead times vary depending on manufacturer stock and shipping schedules, and we’re upfront about that instead of promising a date we can’t hit. If your lift is fully down and you’ve got vehicles backed up waiting for suspension work, tell us that up front so we can prioritize getting the kit moving.
We also stock a range of common seal kits at our Ames location, which cuts out manufacturer lead time entirely for the parts we already have on the shelf. If you’re in Urbandale or anywhere else in central Iowa, that can mean same-week turnaround instead of waiting on a freight truck. When you call, have your lift’s location, model, and whether you want to do the rebuild yourself or have us send a tech, and we’ll get you a straight answer on timing.
When a Rebuild Isn’t Enough
Most cylinder leaks on a rotary two post lift are solved with a seal kit, but not always. If the cylinder bore itself is scored or pitted from years of use, new seals won’t hold pressure no matter how well the rebuild is done. We’ve also seen shops replace both cylinders on a lift only to have one blow a seal again within the year, which usually points to a install alignment issue or contamination in the hydraulic fluid rather than a bad seal.
If you’ve already done one rebuild and you’re seeing the same leak again, it’s worth having a technician actually inspect the cylinder rather than just swapping seals a second time. We’ll tell you honestly if a full cylinder replacement makes more sense than another rebuild attempt, because a lift that keeps failing in the same spot is costing you more in downtime than the parts are worth. Our goal is to get your rotary two post lift back to reliable, safe service, whether that’s a straightforward seal kit or something bigger.
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