Hydraulic Pump Rebuild in Ames, Iowa
When a hydraulic pump starts whining, losing pressure, or won’t build flow like it used to, most folks assume it’s time to buy new. A lot of the time, a hydraulic pump rebuild gets the machine back to full strength for a fraction of what a replacement pump costs. We’ve been doing this at 210 Freel Dr in Ames for years, and a hydraulic pump rebuild is one of the most common jobs that comes across our bench.
Pumps fail the same way cylinders do — internal wear, scoring, and seals that give up after years of heat cycling and contamination. We see gear pumps with scored bores, piston pumps with worn wear plates, and vane pumps where the cartridge just doesn’t seal anymore. A hydraulic pump rebuild fixes the internal wear without you having to replace the whole unit, the mounting brackets, or the plumbing that’s already fit to your machine.
How we do a hydraulic pump rebuild
Every hydraulic pump rebuild starts the same way — we pull the pump off the machine, cap the lines so nothing drips into the shop floor, and get it on the bench where we can actually see what’s going on inside. From there:
- We tear the pump down completely and inspect the gears, pistons, vanes, or bore for scoring and wear
- We measure critical clearances against spec — if a shaft or bore is worn past tolerance, we flag it before we go any further
- We source and install new seals, O-rings, wear plates, and bearings as needed — a lot of our seal kits are pulled from stock we keep on hand for common pump models
- We reassemble to torque spec and pressure test the pump on our bench before it ever goes back on your equipment
- We reinstall, bleed the system, and run the machine under load to confirm pressure and flow are where they should be
If you’re outside Ames proper, we run mileage rates for shop pickups and on-site work — most jobs within 40 miles of the shop run a flat trip charge, and we’ll quote that up front before we load the trailer. We also handle related work like the hydraulic cylinder rebuild cost guide if your machine has cylinder issues alongside the pump — it’s common for both to wear out around the same time on older equipment.
Common pump failures we see on the bench
Most of the pumps that come in for a hydraulic pump rebuild show one of a handful of failure patterns:
- Scoring inside the pump body — usually from contaminated fluid or a filter that went too long without changing. Once the bore or gear faces are scored, a straight seal swap won’t hold pressure.
- Worn shaft seals — you’ll see fluid weeping from the shaft end, and eventually air gets pulled into the system, causing cavitation and that telltale whine.
- Cracked or worn wear plates — common on piston pumps that have run low on fluid or overheated.
- Loss of flow under load — the pump still turns fine at idle but can’t keep up once you put the machine to work. That’s almost always internal wear letting fluid bypass instead of doing its job.
One thing we tell every customer up front: after we complete a hydraulic pump rebuild, it’s not unusual for a related component — a cylinder, a valve, a hose that’s been compensating for low pressure — to show its own problems once full pressure is restored. We’ve seen it plenty of times where a rebuild on one part exposes a weak point somewhere else in the system that had been masked by the pump running weak. We’d rather tell you that now than have it surprise you later.
How much does a hydraulic pump rebuild cost
Pricing on a hydraulic pump rebuild depends on the pump type, how bad the internal wear is, and whether we can source seal kits off the shelf or have to order specialty parts. Rough ranges we typically see:
- Small gear pump rebuild with standard seal kit: $300–$600
- Piston pump rebuild with wear plate and bearing replacement: $600–$1,200
- Pumps with scored bores or shafts that need machining or sleeving: add $300–$800 on top of a standard rebuild
- Mileage for shop pickup or on-site service: typically a flat rate for round trips within 40 miles, more beyond that
If the internal wear is bad enough that a rebuild won’t hold — scoring too deep, a cracked housing, a shaft that’s out of round — we’ll tell you before we button it back up, and a full replacement pump might run anywhere from $800 to well over $2,000 depending on the unit. We don’t rebuild something and hope it holds; if it’s not going to work, we say so before we charge you for the attempt.
We also do a lot of related cylinder work out of the same shop — if your equipment’s giving you trouble on both ends, check out our cylinder repair work out of Winterset or our excavator cylinder rebuilds near Boone for more on how we handle the cylinder side of things. And if you’re searching from outside Ames, we cover a good chunk of central Iowa for hydraulic cylinder rebuild work across Iowa too.
If your pump is whining, losing power, or just not keeping up anymore, don’t wait until it fails completely and takes other components with it. Give us a call at 515-292-2599 and we’ll get you scheduled for a hydraulic pump rebuild, or talk through what we’re seeing before any work starts.
Frequently Asked Questions
How long does a hydraulic pump rebuild take?
Most pump rebuilds take one to three days once the pump is on our bench, depending on parts availability. If we have the seal kit in stock, we can often turn it around faster.
Is it cheaper to rebuild a hydraulic pump or replace it?
In most cases a rebuild costs less than a new pump, especially for pumps that aren’t a common off-the-shelf model. We’ll tell you honestly if replacement makes more sense for your situation.
What causes a hydraulic pump to fail in the first place?
Contaminated fluid, running low on fluid, overheating, and normal wear over thousands of hours are the biggest culprits. Scoring inside the pump is almost always tied to one of those.
Do you work on gear pumps and piston pumps?
Yes, we handle gear, vane, and piston pump rebuilds for ag equipment, construction machinery, and industrial hydraulic systems.
Do you come out to my location for pump work?
We can pick up equipment or send a technician on-site within about 40 miles of our Ames shop for a flat mileage rate. Call 515-292-2599 and we’ll work out the details.
Written by Josiah Ragsdale, Ames Hydraulics