Hydraulic Motor Repair in Ames, Iowa
When a hydraulic motor stops turning, slows down under load, or starts leaking out the case drain, most shops around here call us. We do hydraulic motor repair on everything from small SAE A flange gerotor motors to bigger dual-port units like the WH04-1023Y PiusPump style motor with a 6.2:1 ratio and H-shaft — the kind you’ll find running augers, rail saws, and material handling attachments. If it spins hydraulic oil into mechanical work, we’ve probably had one apart on the bench.
Hydraulic motor repair isn’t glamorous work. It’s seal kits, bearing races, splined shafts, and a lot of careful measuring before we tell a customer whether a motor is worth rebuilding or worth replacing outright. We’ve replaced motors on rail saws and tested them same day when the housing was too far gone to save, and we’ve rebuilt others — pulling the old seals, checking the case for scoring, and putting new NBR seals and back-up rings back in — when the core was solid.
How We Do Hydraulic Motor Repair
Every hydraulic motor repair starts the same way: we want to know what the equipment was doing right before it failed. Slow cycle time, no rotation, growling noise, or oil in the case drain line all point us toward different problems before we even pull the motor.
- Pull the motor and inspect the shaft, seals, and mounting flange for wear or damage
- Flush and inspect the case for metal contamination — a sign the motor already ate itself
- Pressure test the motor to find internal leakage past the gerotor set or vane pack
- Replace seals, back-up rings, and bearings as needed — we stock common sizes like 3 x 2-1/4 back-up rings and matching NBR seal sets
- Reassemble, bench test under load, and check case drain flow before it goes back on the machine
On simpler jobs, like a rail saw motor that’s cracked its housing or worn its shaft splines past spec, hydraulic motor repair sometimes means a straight swap. We’ve replaced hydraulic motors on rail saws and tested them right there in the shop so the customer isn’t down for days waiting on a rebuild that wouldn’t have held up anyway. If the motor is feeding a bigger material handling system, we also cover that side of things over at our material handling hydraulic repair page.
Common Hydraulic Motor Failures We See
Most of the hydraulic motor repair calls we get fall into a handful of patterns. Knowing which one you’ve got helps us quote the job faster.
Motor turns slow or loses power under load
Usually internal wear — worn gerotor lobes, a scored case, or leaking seals letting oil bypass instead of doing work. Sometimes it’s not the motor at all; if the whole system is weak, check our page on a hydraulic pump not building pressure before assuming the motor is the culprit.
Motor won’t turn at all
Could be a sheared shaft, a seized bearing, or a control valve issue upstream. We test the motor in isolation first so we’re not chasing the wrong part.
Oil in the case drain or leaking at the shaft seal
Classic sign of a failing shaft seal or worn bearing letting pressurized oil past. This is one of the more common — and cheaper — hydraulic motor repair jobs we do.
Noise, vibration, or metal shavings in the oil
This tells us the motor has already been running damaged for a while. Once we find metal in the case, we’re usually talking full rebuild or replacement, not just a seal kit.
How Much Does Hydraulic Motor Repair Cost?
Straight answers, no surprises. Basic hydraulic motor repair with a seal and bearing kit on a common gerotor or vane motor usually runs $250 to $600 in parts and labor, depending on size and how many O-rings and back-up rings it takes. Larger dual-port SAE A or SAE B flange motors, especially ones with worn shafts or scored housings, land closer to $600 to $1,200 once you factor in machine time and replacement bearings. Full replacement — like the rail saw motor swaps we’ve done — runs anywhere from $400 to $1,500 depending on the motor and whether it’s a stock part or something we have to source.
Shop labor is billed hourly and shows up on every job whether it’s a drive-up seal replacement or a full teardown. If a motor comes in alongside a cylinder that’s also leaking, it’s worth checking our hydraulic cylinder rebuild cost guide since a lot of customers end up doing both at once to avoid a second trip.
We’ll never rebuild a motor that’s cheaper to replace, and we won’t replace one that just needed a $60 seal kit. That’s the whole point of doing hydraulic motor repair in-house instead of shipping it off — we open it up, tell you what we actually found, and quote it straight.
If your equipment has a hydraulic motor that’s slowing down, leaking, or dead in the water, bring it by 210 Freel Dr in Ames or give us a call at 515-292-2599. We’ll get it on the bench, figure out what’s actually wrong, and get you a real number for hydraulic motor repair before we start turning wrenches.
Frequently Asked Questions
How do I know if my hydraulic motor needs repair or just a seal kit?
If the motor still turns but leaks at the shaft or case drain, it’s often just a seal kit job. If it’s slow under load, noisy, or won’t turn at all, there’s usually internal wear that needs a full teardown to diagnose.
Can you rebuild a hydraulic motor or do I need a new one?
Depends on the housing and shaft condition. We inspect for scoring and metal contamination first — if the core is solid, a rebuild with new seals and bearings is almost always cheaper than a new motor.
How long does hydraulic motor repair take?
Simple seal and bearing jobs are often same-day or next-day. Full rebuilds or motors needing sourced parts can take a few days, but we’ll give you a real timeline once we’ve had it apart.
Do you work on rail saw and material handling hydraulic motors?
Yes. We’ve replaced and rebuilt motors on rail saws and various material handling equipment, and we test every motor under load before it goes back on the machine.
What does hydraulic motor repair cost in Ames?
Most basic repairs run $250 to $600, larger or more damaged motors run $600 to $1,200, and full replacements typically run $400 to $1,500 depending on the motor and parts availability.
Written by Josiah Ragsdale, Ames Hydraulics