Hydraulic Cylinder Seal Repair in Ames, Iowa
When a cylinder starts creeping down under load or you see oil weeping past the rod, that’s almost always a seal problem, not a cracked barrel. We do hydraulic cylinder seal repair on everything from loader lift arms to shop lift cylinders to skid steer tilt rams, and most of the time we can save the original cylinder instead of sending you home with a bill for a whole new ram.
How We Do Hydraulic Cylinder Seal Repair
We pull the cylinder off the machine, clamp it in the bench vise, and crack it open end to end. Once it’s apart we inspect the bore for scoring — that’s the number one thing that decides whether hydraulic cylinder seal repair alone will fix the problem or whether the barrel itself needs replacing. If the chrome on the rod and the bore surface are still clean, we’re in good shape.
- Remove the cylinder from the machine and tag hose routing
- Disassemble and inspect the rod, gland, piston, and bore for scoring or pitting
- Measure and source the correct head seal, piston seal, U-seals, and wiper seal for that bore and rod size
- Rebuild with new seals, reassemble to spec, and reinstall on the machine
- Bleed the system and cycle the cylinder under load to check for drift and leaks
On a typical job we’re replacing a head seal, a piston seal, matched U-seals, and a wiper seal — for example a 3″ head seal, a 3″ piston seal, 1-1/8″ U-seals, and a 1-1/2″ wiper seal on a mid-size cylinder. Every cylinder is a little different, which is why we measure instead of guess. If you want the full breakdown of parts and pricing across different cylinder sizes, our cylinder rebuild cost guide walks through it.
Common Symptoms That Mean You Need Hydraulic Cylinder Seal Repair
Most customers call us for one of these:
- Cylinder drifts down under load — classic worn piston seal, oil is bypassing internally
- Oil weeping around the rod — usually the wiper seal or rod seal has hardened and let dirt cut a groove
- Jerky or spongy movement — air in the system after a seal started leaking, or a scored bore letting oil slip past
- Lift won’t hold a car or piece of equipment steady — common on shop lift cylinders and something we see a lot on lock release cylinders too
Here’s the thing to know going in: hydraulic cylinder seal repair on one cylinder often exposes trouble in a second one. If you’ve got a two-cylinder lift or a boom with a matching pair, it’s really common for the other cylinder to start blowing out not long after we rebuild the first one, since they’ve been running the same hours and the same wear. We’ll tell you straight if we see early scoring on the second cylinder so you’re not surprised later.
If the bore is too scored for a seal-only fix, we let you know before we go further — sometimes hydraulic cylinder seal repair isn’t enough and the barrel or the whole cylinder needs replacing. We do that work too, whether it’s an excavator boom cylinder like the ones we handle on our excavator cylinder rebuild jobs near Boone or a smaller ram off a skid steer or tractor.
How Much Does Hydraulic Cylinder Seal Repair Cost
Pricing depends on cylinder size, seal kit cost, and whether the bore needs machine work. Rough ranges we see at the bench:
- Small cylinders (under 2″ bore, lock releases, small lift cylinders): $145–$400 including parts and labor
- Mid-size cylinders (2″–4″ bore, loader and skid steer cylinders): $400–$900
- Large cylinders (excavator boom, dump bed, big lift rams): $900–$1,800+
- If the rebuild doesn’t hold and the barrel is too scored, expect to add $300–$800 for a replacement cylinder instead of a reseal
- Shop mileage for on-site pickup or install runs a flat rate for the first 30–40 miles round trip, more beyond that
Those numbers cover the seal kit itself — head seal, piston seal, U-seals, wiper seal — plus the labor to remove, disassemble, rebuild, reinstall, and bleed the cylinder. We quote before we start so there’s no surprise invoice. Customers from Winterset, Boone, and around central Iowa bring cylinders to our Ames shop or have us come to them; see our Winterset cylinder repair page or our Iowa cylinder rebuild service area page for how we handle jobs outside Ames.
Seal failure and final drive failure often get mixed up by owners since both cause slow, weak movement — if your equipment is losing power on turns instead of just drift under load, it might be worth a look at our final drive rebuild page as well.
If your cylinder is drifting, leaking, or just not holding like it used to, don’t wait for it to get worse — scoring gets more expensive the longer it runs dry on a worn seal. Call us at 515-292-2599 and we’ll get you scheduled for hydraulic cylinder seal repair, tell you straight whether a reseal will hold, and get your equipment back to work.
Frequently Asked Questions
How do I know if my cylinder needs a seal repair or a full replacement?
If the rod and bore surfaces are still smooth, hydraulic cylinder seal repair usually does the job. If we find scoring or deep pitting in the bore during teardown, a reseal won’t hold long-term and you’re better off replacing the cylinder — we’ll show you what we find before deciding.
How long does hydraulic cylinder seal repair take?
Most cylinders come apart, get rebuilt, and go back on the machine within a day or two once we have the right seal kit in hand. Larger or harder-to-source cylinders can take longer if parts need to be ordered.
Why did my other cylinder start leaking right after you fixed this one?
It’s common on paired cylinders — both have been running the same hours under the same load, so if one seal wore out, the other is usually close behind. We always check the mate cylinder while we’re in there.
Can you do hydraulic cylinder seal repair on-site or do I have to bring it in?
Depends on the equipment. Some cylinders we can pull and reseal at your location; others come back to our Ames shop bench for the teardown. Call 515-292-2599 and we’ll tell you what makes sense for your machine.
What does hydraulic cylinder seal repair cost for a small lock or lift cylinder?
Smaller cylinders, like lock release cylinders, typically run in the $145–$400 range for parts and labor depending on seal availability and condition.
Written by Josiah Ragsdale, Ames Hydraulics