Danfoss OMR 125: how to size it, which version you have and what it costs
The Danfoss OMR 125 sits in an awkward middle. It’s big enough to run a heavy conveyor or an auger, but small enough that a wrong size shows up quickly as heat or a stalled drive. Most buyers order it because “that’s what was on the machine.” That’s fine until the machine’s duty has changed. This guide gives you the real ratings, a way to check whether this size still fits and the version trap. Advance Hydraulic Works works with hydraulic pump and motor repair and supply from Delhi NCR, and this is how we’d go through it with you.
Danfoss OMR 125 motor: the real ratings
One reseller describes the common version as a 125 cm³ motor with a 25 mm straight shaft and 8 mm key, an SAE-A 2-hole flange with 82.5 mm centring diameter and 106.4 mm hole spacing, G1/2 side ports and no drain port, with a displacement of 125.7 cm³ and a maximum speed of 475 rpm, or 600 rpm intermittent.
A manufacturer’s datasheet table gives the continuous values as a torque of 300 N·m and a speed of 475 rpm. An Indian seller’s table lists 175 bar and 12.5 kW continuous. At 475 rpm, flow is 125.7 × 475 ÷ 1,000, about 60 litres per minute, which fits the family’s continuous limit.
Danfoss OMR 125 hydraulic motor: the version trap
Listings use more than one number for what looks like the same size. A European shop lists the 151-0413 as design number 6, with seal kit 151-1286 and a newer material number of 11186655. The same page mentions a related listing, 151-0423, with its own new number, 11185567. Aftermarket listings often combine 151-0413 and 151-0713 in one title.
I couldn’t confirm what separates each of these numbers. For the smaller sizes, the 07xx numbers are listed with a case drain, so check whether yours has a drain port. Match your full nameplate, not just the size.
What the Danfoss OMR 125 costs
These are overseas listings, and none is an Advance Hydraulic Works price:
- A US distributor at $480.67, marked in stock.
- A European shop at €552.15 excluding VAT.
- An aftermarket motor at $336.96 and another at $319.95, both listed as replacements for the original.
- A replacement motor at $273.28, currently backordered.
- A used, untested unit that sold at $195 with wear on the flange and no returns.
The top figure is about two and a half times the bottom one ($480.67 against $195). Maker, condition and warranty explain the gap. The size doesn’t.
The method: duty, size, version, proof
Duty. Work out the torque, speed and pressure your machine needs continuously.
Size. Check them against the ratings above.
Version. Copy the full part number and note whether it has a drain port.
Proof. Ask the seller for the maker, condition, warranty and a plate photo.
A worked example
Say a drive needs 280 N·m continuously at about 450 rpm. At 450 rpm the Danfoss OMR calls for one hundred and twenty-five hundred and twenty-five.7 × 450 ÷ 1,000, roughly equivalent to fifty-seven liters a minute. The pressure for 280 N•m is 280 × 62.eight ÷ one hundred and twenty-five.7, close to one hundred and forty bar theoretical, so a one-time loss around one hundred and sixty bars is calculated. It fits under the one hundred and seventy-five bar restriction, and the 280 N•m sits under the 300 N•m continuous score. So the motor is the right size, with a little margin.
Now try the next size down. A 99.8 cm³ motor is rated at 240 N·m continuous, so it can’t carry 280 N·m for long. Stepping down to save money would give you a hot, short-lived drive. That check takes a minute and saves a replacement. This is illustrative arithmetic, so use the current data for your exact motors.
Implementation steps
- Photograph the nameplate, shaft, and flange of the vintage motor before removing it.
- Write down the overall component detailed variation, including 151-0413, and observe if it has a drain port.
- Consistently work your machine's will with torque, speed, and tension.
- Check them out for 300 N•m, 475 rpm and 175 bar ratings.
- Send the whole thing to Advance Hydraulic Works and ask what is available.
- Ask the seller to nation the author, condition, wide variety, and warranty in writing.
- Compare the plate and shaft of the delivered motor with your old one before it happens.
- Flush traces, healthy motor, run first dismounted and check temperature and noise.
The usual mistakes are keeping a size after the duty has changed, matching only the size and running above the continuous ratings.
FAQs
What is the Danfoss OMR 125?
An orbital motor with 125.7 cm³ displacement, rated at about 475 rpm, 300 N·m and 175 bar continuous. It’s used on conveyors, augers and sweepers.
What is the Danfoss OMR one hundred and twenty five motor used for?
Low-speed high-torque drives where gearboxes can add value and size, including conveyors, augers, sweepers and small wheel drives
How do I find out if the Danfoss OMR 125 hydraulic motor is sized correctly?
Work out the non-stop torque, speed and pressure you want, then compare them to 300 N•m, 475 rpm and one hundred and seventy-five bars. If you’re close to the limit, take the next measure.
Why is the Danfoss OMR one hundred and twenty five fee much inflated?
Manufacturers, conditions, warranties, and dealers vary. Overseas listings range from about $195 for a used unit to about $500 for new ones, so compare like with like.
Can Advanced Hydraulic Works offer a Danfoss OMR 125 hydraulic motor?
Send nameplate pics, model code and operating strain to Advance Hydraulic Works and ask for approximate availability, manufacturer and assurance before you expect to commit.
Your next step
Photograph the nameplate, work out your continuous duty and send everything to Advance Hydraulic Works. You’ll know exactly which motor you need before you spend anything.
