Hyster S120 Tilt Cylinder Rebuild in Ames, Iowa
If your Hyster S120 forklift is dropping its mast angle, drifting forward on a slope, or leaking hydraulic fluid down the tilt ram, you’re looking at a Hyster S120 tilt cylinder rebuild. This isn’t a mystery job for us — we’ve had these cylinders on the bench plenty of times, and the failure pattern is almost always the same: worn piston seals, a scored bore from contaminated fluid, or a lock cable that’s stretched past spec and needs replacing along with the cylinder work.
A Hyster S120 is a heavy-duty lift, and its tilt cylinders take a beating every time an operator racks a load or tips a mast forward under weight. Over time the rod seal wears, fluid bypasses the piston, and you lose the ability to hold a tilt angle steady. That’s when we get the call for a Hyster S120 tilt cylinder rebuild instead of a full cylinder swap — rebuilding is almost always the cheaper path if the bore hasn’t scored too badly.
How We Do a Hyster S120 Tilt Cylinder Rebuild
Every Hyster S120 tilt cylinder rebuild we run follows the same sequence at our Freel Drive shop:
- Pull the cylinder off the mast and drain remaining fluid so we can inspect for metal shavings or dark, burnt hydraulic oil
- Disassemble the cylinder and measure the bore for scoring or out-of-round wear
- Hone the bore if wear is light, or source a new tube if scoring is deep enough that a rebuild won’t hold pressure
- Install a fresh piston seal, head seal, U-seals, and wiper seal matched to the S120’s cylinder dimensions
- Replace the lock cable if it’s stretched or fraying — a weak lock cable is a common reason the tilt angle won’t hold even after a fresh seal job
- Reinstall the cylinder, bleed the hydraulic circuit, and cycle the mast fully to check for smooth, even tilt in both directions
We stock the common seal sizes for this cylinder family — piston seals around 3″ x 1.062″ x 3.25″, head seals near 3″ x 0.062″ x 3/16″, and matching U-seals and wiper seals — so most Hyster S120 tilt cylinder rebuild jobs don’t sit around waiting on parts.
Common Failure Signs We See Before a Hyster S120 Tilt Cylinder Rebuild
Most customers bring the machine in after noticing one or more of these:
- Mast tilts forward on its own when the load is set down or the machine is parked on a slope
- Visible fluid streaking down the outside of the cylinder barrel or pooling under the mast
- Gritty or spongy feel in the tilt lever, meaning air or contaminated fluid is in the line
- Tilt angle that holds fine empty but sags under a loaded fork
Here’s something we tell every customer up front before we start a Hyster S120 tilt cylinder rebuild: it’s really common for the opposite-side tilt cylinder to blow out shortly after we rebuild the first one. Both cylinders usually see the same contaminated fluid and the same operating hours, so if one has scored internally, the other is often close behind. If the rebuild on the second cylinder doesn’t hold pressure because the bore is too far gone, you’re looking at a new cylinder instead of a repair, which typically adds $300 to $800 depending on the tube condition and part availability.
How Much Does a Hyster S120 Tilt Cylinder Rebuild Cost
Pricing on a Hyster S120 tilt cylinder rebuild depends mostly on how badly the bore is scored and whether the lock cable needs replacing too. Rough ranges we typically quote:
- Seal kit rebuild only (light scoring, honed bore): $450–$650 including removal, rebuild, install, and bleed
- Rebuild plus new lock cable: add roughly $100–$180 for cable and labor
- Bore too scored to hone, requiring a new cylinder: add $300–$800 depending on tube and rod availability
- Shop mileage for on-site pickup or delivery within 40 miles of Ames: usually built into the quote at no separate charge, farther trips billed per mile
We break down full pricing logic, including what drives cost up or down on any cylinder job, on our hydraulic cylinder rebuild cost guide. If your S120 is down and you need a number before you commit, give us a call and we’ll walk through it based on what you’re seeing.
We handle Hyster S120 tilt cylinder rebuild work for forklift fleets, ag operations, and construction outfits across central Iowa, not just here in Ames. If you’re closer to the Winterset area we also run cylinder repair out of that service line, and if this is an excavator or loader cylinder instead of a forklift tilt ram, our excavator cylinder rebuild service in Boone covers that ground. For a broader look at where we work statewide, check our hydraulic cylinder rebuild coverage across Iowa.
If your Hyster S120’s mast is drifting, leaking, or won’t hold a tilt angle, don’t wait for the second cylinder to go too. Call us at 515-292-2599 and we’ll get your Hyster S120 tilt cylinder rebuild scheduled at the bench.
Frequently Asked Questions
How long does a Hyster S120 tilt cylinder rebuild take?
Most rebuilds run one to two days once the cylinder is on our bench, depending on whether the bore needs honing or we’re waiting on a specific seal size. If the tube is scored past saving and needs replacing, it can take longer.
Can you rebuild both tilt cylinders at once on my Hyster S120?
Yes, and we usually recommend it if one side has scoring, since both cylinders typically run the same hours and fluid. Doing both at once often saves you a second removal and install charge later.
Will a rebuilt tilt cylinder leak again right away?
Not if the bore honed clean and the seals seated properly during bleed and test. If the bore was too scored for a proper seal seat, we’ll tell you before we button it up rather than sending you out with a repair that won’t hold.
Do you come pick up the forklift or do I have to bring it in?
We can pick up within about 40 miles of our Ames shop for a standard mileage rate, or you can drop the cylinder or the machine off at 210 Freel Dr if that’s easier on your schedule.
What’s the difference between rebuilding and replacing the tilt cylinder?
A rebuild reuses your existing tube and rod with new seals, which is cheaper if the bore isn’t badly scored. Replacement means a new cylinder assembly, which we only recommend once a rebuild won’t hold pressure.
Written by Josiah Ragsdale, Ames Hydraulics