Hydraulic Cylinder Seal Replacement in Ames, Iowa
If a cylinder on your loader, skid steer, or in-ground lift has started weeping oil down the rod or won’t hold a load anymore, you’re probably looking at hydraulic cylinder seal replacement. That’s the job we do most often on the bench here at Ames Hydraulics, and it’s usually cheaper and faster than most folks expect once we get the barrel apart and can actually see what’s going on inside.
We pull cylinders off everything from tractors and excavators to auto lifts and shop presses, and the fix is almost always the same story: the head seal, piston seal, U-seals, or wiper seal have worn out, hardened, or been chewed up by contamination in the fluid. On a typical 3-inch bore cylinder we’re replacing a head seal, a piston seal, matching U-seals, and a wiper seal as a set — not just swapping the one that’s obviously leaking, because if one’s gone the others aren’t far behind.
How We Do Hydraulic Cylinder Seal Replacement
Here’s the process we walk through on nearly every hydraulic cylinder seal replacement job that comes through our door:
- Remove the cylinder from the machine or equipment (loader, lift, excavator boom, etc.)
- Disassemble the barrel, rod, and gland, and inspect the bore for scoring or pitting
- Measure the rod and bore to pull correct seal part numbers — head seals, piston seals, U-seals, and wiper seals are sized specific to the cylinder, not universal
- Clean and, if needed, hone the barrel before new seals go in
- Reassemble with fresh seals, reinstall the cylinder, and bleed the system
- Cycle the cylinder under load to check for drift or weeping before we call it done
We keep a stock of common seal kits on hand — head seals, piston seals like our 3-inch x 1.062-inch styles, U-seal sets, and wiper seals in standard sizes — so most hydraulic cylinder seal replacement jobs don’t sit around waiting on a parts order. If you’re outside Ames, we cover mileage runs too; most jobs within 40 miles of the shop are a straightforward round trip with one tech and no trailer needed.
Signs You Need Hydraulic Cylinder Seal Replacement
Not every leak means a full rebuild, but here’s what usually points to hydraulic cylinder seal replacement rather than something further downstream:
Oil weeping down the rod
This is the classic sign — the wiper seal or rod seal has worn out and fluid is bypassing it every time the rod extends and retracts.
Cylinder drifts under load
If a bucket, boom, or lift arm slowly drops on its own when it should be holding steady, the piston seal is likely bypassing internally.
Scoring inside the bore
Once contamination gets past a worn seal, it can score the bore itself. This is really common on the second cylinder after we’ve already rebuilt one on the same machine — if scoring is bad enough, a reseal won’t hold and you’re looking at a full cylinder replacement instead.
We’re upfront about this on every quote: if we rebuild a cylinder and it doesn’t hold because the bore is too far gone, that’s when we talk about swapping in a new cylinder rather than throwing more labor at a bad barrel. For a deeper breakdown of pricing on both paths, our hydraulic cylinder rebuild cost guide lays out the numbers.
How Much Does Hydraulic Cylinder Seal Replacement Cost
Pricing depends on cylinder size, bore condition, and whether it’s a straightforward seal swap or a full rebuild with new hardware. Rough ranges we typically see:
- Small cylinders (auto lift, shop equipment): seal kits often run $145 and up for parts, plus labor to remove, reseal, and reinstall
- Mid-size cylinders (loader, skid steer): full hydraulic cylinder seal replacement with removal, reseal, install, and bleed generally lands in the $400–$700 range depending on access and mileage
- Larger cylinders with scoring or a bad rod: if the bore won’t hold a reseal, expect an add of $300 to $800 for a new cylinder instead of a rebuild
We’ve done this work on rotary lift cylinders, excavator boom and stick cylinders, and everyday loader arms, and the price always comes back to the same three things — bore condition, seal kit cost, and how much teardown it takes to get the cylinder out. If you’re near Boone, we handle plenty of excavator work through our excavator cylinder rebuild Boone service, and folks near Winterset use our hydraulic cylinder repair Winterset page to see what we cover out that way.
Hydraulic cylinder seal replacement isn’t a job to put off — once a seal starts weeping, contamination and scoring only get worse, and what could’ve been a $500 reseal turns into a $1,300 cylinder replacement. If you’re anywhere in central Iowa and need hydraulic cylinder seal replacement done right, check our hydraulic cylinder rebuild Iowa coverage area, or just give us a call at 515-292-2599 and we’ll walk you through what your cylinder needs before you spend a dime.
Give us a call at 515-292-2599 — tell us what’s leaking, what machine it’s on, and we’ll get you scheduled for hydraulic cylinder seal replacement at our Ames shop or out at your location.
Frequently Asked Questions
How long does hydraulic cylinder seal replacement take?
Most cylinders we pull are back in service within a day or two, depending on how backed up the bench is and whether we have the seal kit in stock. Bigger equipment or hard-to-access cylinders can take longer.
Can you fix a leaking cylinder without replacing the whole thing?
Usually, yes. Hydraulic cylinder seal replacement handles most leaks without needing a full new cylinder, as long as the bore isn’t scored or pitted too badly to hold new seals.
Do you come to my farm or job site for cylinder work?
We do. We run mileage jobs within about 40 miles of our Ames shop for a single technician, no trailer, for straightforward removal and reseal work.
What’s the difference between a reseal and a full cylinder rebuild?
A reseal replaces the head, piston, U-seals, and wiper seal. A full rebuild may also include honing the bore, replacing the rod if it’s grooved, and new hardware if the gland or retainer is worn.
Why did my other cylinder start leaking right after you fixed one?
It’s common on machines with matched cylinders — if one seal set wore out from age or contamination, the other one is usually right behind it and about ready to go too.
Written by Josiah Ragsdale, Ames Hydraulics