Hydraulic Pump Repair in Ames, Iowa
When a hydraulic pump starts whining, losing pressure, or just quits pushing fluid, most shops around here send you to a dealer and tell you to wait three weeks for a new unit. We don’t do that. Hydraulic pump repair is bread-and-butter work at our bench on Freel Dr — we’ve pulled pumps off flatbed trucks, scissor lifts, and dock levelers, and more often than not we can rebuild what’s in front of us instead of forcing you into buying new.
We see everything from small gear pumps on utility trucks to 15 GPM units feeding hydraulic reels, PTO-driven pumps with worn splines, and lift pumps that have been chewing themselves apart from old, dirty ATF Hydra fluid. Whatever brought the machine in, our approach to hydraulic pump repair starts the same way: figure out exactly what failed before we touch a wrench.
How We Handle Hydraulic Pump Repair
Our hydraulic pump repair process isn’t guesswork. We start with a pressure test to see if the pump is even building the PSI it’s rated for — a lot of the units we get in are limping along at half their spec, which points straight to worn gears, scored vanes, or a bad relief valve rather than a dead pump. If you want more detail on what that specific failure looks like, we’ve written up the diagnostic steps on our hydraulic pump not building pressure page.
From there we pull the pump, drain it, and open the housing to inspect the gears, bearings, and shaft seal. On flatbed truck pumps we’re often replacing the whole unit and re-plumbing the fittings — we’ve done this labor job enough times that it’s routine: disconnect, swap pump, reconnect hose barbs and JIC fittings, bleed the system, test under load before the truck leaves. On lift equipment, hydraulic pump repair usually means a new pump, new valves, and a full ATF fluid change, then a delivery back to the customer if the unit’s too big to trailer easily.
For material handling equipment specifically — pallet jacks, dock plates, scissor lifts — the pump repair work often overlaps with cylinder and valve issues, which is why we treat it as one job. Our material handling hydraulic repair crew handles pump, cylinder, and valve work together so you’re not paying for three separate visits.
Rebuild or Replace?
Not every failed pump needs to be junked. If the housing and shaft are in good shape and it’s just worn internals — gears, vanes, seals — a medium rebuild often runs a fraction of new-pump cost. We’ll tell you straight which way makes sense for your equipment and your budget before we start cutting parts loose.
Common Hydraulic Pump Failure Symptoms We See
Most of the calls we get for hydraulic pump repair fall into a handful of patterns. If your equipment is doing any of the following, the pump is worth checking before you replace anything else on the machine:
- Loud whining or grinding noise that gets worse under load — usually cavitation or worn bearings
- Cylinders moving slower than they used to, even with fresh fluid
- Pump running but never building full system pressure (relief valve or internal wear)
- Fluid coming out around the shaft seal or PTO coupling
- Overheating hydraulic oil after short run times
- Metal flakes or fine grit showing up in the reservoir or filter
We’ve replaced our share of gear pumps — 0.94L displacement units running 18,000 RPM aren’t unusual on the flatbed trucks we service — where the customer thought the cylinder was bad, but it turned out to be the pump starving the system of pressure. If a cylinder on the same machine is also acting up, it’s worth reading through our cylinder rebuild cost guide so you know what you’re looking at on both ends.
Blackmer-style pumps show their own specific symptoms — usually vane wear or a sticking check valve — and we’ve put together a separate troubleshooting writeup on our Blackmer pump troubleshooting page if that’s what you’re running.
How Much Does Hydraulic Pump Repair Cost
Costs vary a lot depending on whether we’re rebuilding or replacing, and what the pump is bolted to. Here’s roughly what we see:
- Shop labor: $95–$150 per hour depending on the job’s complexity
- Medium gear pump rebuild: $400–$900 in labor and parts, not counting a new pump if internals are too far gone
- Flatbed truck hydraulic pump replacement (labor plus pump): $800–$1,800
- Lift equipment pump replacement, including new valves, installation, and delivery within 100 miles: $1,200–$2,200
- PTO-driven gear pump swap with new hub and shaft components: $600–$1,500
These ranges reflect real jobs — a lift repair with a new pump, valves, and a 5-gallon bucket of ATF fluid, or a truck pump swap that’s mostly labor because the customer supplied the pump. If a cylinder needs rebuilding at the same time, our cylinder repair crew can knock both out in one visit, which usually saves money over two separate trips.
Every hydraulic pump repair we quote is broken down line by line — pump, fittings, fluid, labor, and mileage if we’re delivering — so you know what you’re paying for before we start. No surprise invoices, no guessing.
If your equipment is whining, leaking, or losing pressure, don’t wait for it to get worse. Give us a call at 515-292-2599 and tell us what it’s doing — we’ll walk you through what a hydraulic pump repair visit looks like and get you on the schedule.
Frequently Asked Questions
How long does hydraulic pump repair usually take?
Most gear pump rebuilds are done same-day or next-day once we’ve diagnosed the failure. Flatbed truck and lift pump replacements usually take one to two days depending on parts availability, since we stock common gear pumps but sometimes order specific fittings.
Can you rebuild my pump instead of replacing it?
Often, yes. If the housing and shaft are in good condition, a medium rebuild with new seals, gears, or vanes costs less than a full replacement. We’ll open the pump and tell you honestly which route makes sense.
Why does my hydraulic pump whine but still run?
Whining almost always points to cavitation — air getting into the pump, usually from a low fluid level, a bad suction hose, or a clogged filter. It can also mean worn bearings inside the pump housing that need to be replaced before they fail completely.
Do you work on hydraulic pumps for flatbed trucks and lift equipment?
Yes, that’s a big part of our day-to-day work. We handle pump replacement and labor on flatbed truck hydraulic systems, plus full lift repairs including new pumps, valves, and delivery within 100 miles of our shop.
How much does it cost to fix a hydraulic pump that’s not building pressure?
It depends on the cause — a bad relief valve might only run a couple hundred dollars in parts and labor, while worn internal gears or vanes usually mean a rebuild in the $400–$900 range, or replacement if damage is severe.
Written by Josiah Ragsdale, Ames Hydraulics