Hyster H155 Mast Cylinder Repair in Ames, Iowa
If your Hyster H155 is creeping down under load, leaning off to one side on the forks, or leaving a puddle of hydraulic oil under the mast rails, you’re looking at Hyster H155 mast cylinder repair. This is one of the more common calls we get out of warehouses and yards around Ames — the H155 is a workhorse, but that lift cylinder takes a beating year after year, and eventually the rod seals give out or the bore scores.
We’ve pulled, rebuilt, and reinstalled a lot of mast cylinders off Hyster H155 units over the years, and we’ve learned where they fail and how to tell a customer honestly whether a rebuild will hold or whether they’re better off replacing the cylinder outright. Hyster H155 mast cylinder repair isn’t always a simple reseal — sometimes the bore is scored bad enough that a rebuild won’t hold pressure, and we’ll tell you that up front instead of billing you twice.
How We Handle Hyster H155 Mast Cylinder Repair at Our Ames Shop
Every Hyster H155 mast cylinder repair job starts the same way — we pull the cylinder off the truck, drain it, and get it stripped down on the bench so we can actually see what we’re dealing with. Scoring on the bore wall, a chewed-up rod, a lock cable that’s stretched or frayed — all of it gets inspected before we quote anything final.
- Remove the mast cylinder from the H155 and tag hoses/fittings for reassembly
- Strip the cylinder down and inspect the bore, rod, and glands for scoring or pitting
- Replace head seals, piston seals, U-seals, and wiper seals to spec (we stock common sizes like 3″ head seals and 1-1/2″ wiper seals)
- Hone or replace the bore if scoring is present
- Install a new lock cable if the old one is stretched or frayed
- Reinstall the cylinder, bleed the system, and cycle the mast under load to confirm it holds
We also check the second mast cylinder while we’re in there. It’s really common for the other cylinder to start leaking or blow a seal not long after we rebuild the first one — same age, same mileage, same wear pattern. We’ll flag it if it looks close to failing so you’re not back on the phone with us in three weeks.
Common Symptoms That Point to Hyster H155 Mast Cylinder Repair
Most customers don’t call us saying “I need a mast cylinder rebuild” — they call describing what the truck is doing wrong. Here’s how those symptoms usually break down:
Mast Drifts or Creeps Down Under Load
This is almost always a worn piston seal or scored bore letting hydraulic oil bypass internally. The lift will hold for a minute, then slowly sink. That’s textbook Hyster H155 mast cylinder repair territory.
Visible Oil on the Mast Rails or Base
Rod seals or wiper seals failing lets oil weep down the cylinder wall. If you’re topping off the reservoir more than you used to, the cylinder is losing fluid somewhere it shouldn’t.
Mast Leans or Racks to One Side
If one lift cylinder is weaker than the other, the forks won’t rise evenly. This uneven wear is exactly why we always inspect both cylinders during a rebuild, not just the one that’s failed.
Lock Cable Failure or Loose Mast Lock
On some H155 setups the lock cable stretches or frays over time. We replace it as part of the rebuild so you’re not paying labor twice down the road.
How Much Does Hyster H155 Mast Cylinder Repair Cost
Pricing depends mostly on whether the bore can be saved or has to be replaced. Here’s roughly what we see:
- Standard rebuild (seals, bore inspection, reassembly, bleed): typically $400–$700 depending on seal kit and labor
- Rebuild with new lock cable included: add roughly $50–$100 for cable and install time
- If the bore is too scored to hold a rebuild and you need a new cylinder: add $300–$800 depending on cylinder size and availability
- Small individual components like a lock release cylinder can run around $145 plus labor if that’s the only failure point
- Shop mileage for on-site work runs a flat rate for the first 40 miles round trip from Ames, more beyond that
We always try the rebuild first because it’s cheaper than a new cylinder, but we’re upfront if scoring is bad enough that a rebuild won’t hold pressure long-term. Nobody wants to pay for a rebuild twice. For a broader breakdown of what drives cylinder repair pricing across different equipment, our hydraulic cylinder rebuild cost guide walks through the variables in more detail.
We handle Hyster H155 mast cylinder repair for forklifts working warehouses, ag operations, and construction yards all over central Iowa. If you’re outside Ames, we also cover cylinder work in Winterset and run excavator cylinder jobs out of Boone on a regular basis, plus mobile service across the state via our Iowa cylinder rebuild locations page.
If your H155 is sinking under load or leaving oil on the shop floor, don’t wait until it strands a load mid-lift. Call us at 515-292-2599 and we’ll get you scheduled for Hyster H155 mast cylinder repair — we’ll tell you straight whether it’s a rebuild or a replacement before we touch a wrench.
Frequently Asked Questions
How long does Hyster H155 mast cylinder repair take?
Most rebuilds are turned around in 1-2 days once the cylinder is on our bench, assuming seal kits are in stock. If the bore needs machining or a new cylinder has to be sourced, it can take longer — we’ll give you a real timeline after inspection.
Can you fix the mast cylinder without pulling the whole mast apart?
Usually yes. In most cases we can remove just the cylinder itself without disassembling the full mast structure, which keeps labor and downtime lower.
Why did my other mast cylinder start leaking right after you rebuilt the first one?
Both cylinders on an H155 see the same load cycles and age at roughly the same rate. It’s common for the second one to fail shortly after the first is rebuilt — we check both during Hyster H155 mast cylinder repair so you know what’s coming.
Is it cheaper to rebuild or replace the mast cylinder?
Rebuilding is almost always cheaper, usually $400-$700 versus $300-$800 more for a full replacement cylinder. We only recommend replacement if the bore is scored too deep for a seal kit to hold.
Do you come to our yard for Hyster H155 mast cylinder repair or do we have to bring it in?
We can do the removal on-site and rebuild the cylinder at our shop, or handle the whole job in-house if you can get the truck to us. Mileage applies for on-site visits beyond our local radius — call 515-292-2599 and we’ll figure out what makes sense for your location.
Written by Josiah Ragsdale, Ames Hydraulics