Danfoss OMR 250 repair: seal kit or full rebuild?
When a Danfoss OMR 250 starts leaking at the shaft, the seal gets the blame. Sometimes that’s fair. Other times the motor is worn inside, and a new seal only hides the problem for a few weeks. One speed measurement separates the two cases. This guide gives you the real ratings, the kit numbers and a simple method for deciding. 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 250 repair: the real ratings
Listings for the not unusual 25 mm shaft model, part wide variety 151-0716, provide a displacement of 249.Three cm³, non-stop velocity of 240 rpm, continuous torque of 300 N·m and a stress drop of 80 bar. Continuous float is 60 litres according to minute.
Those figures give you the test. Theoretical speed is flow in L/min × 1000 ÷ 249.3. At 45 L/min that’s about 180 rpm, and a healthy motor lands close to it. Other versions rate far higher. A 32 mm shaft version is indexed at 540 N·m and a hundred seventy five bar, and a splined version at 360 N·m and a hundred bar. Read the datasheet to your specific element variety before evaluating.
Danfoss OMR 250 seal kit: which one fits
Two kit numbers come up most often. Part number 151-1277 is listed for OMR Series 5 motors with 25.4 mm cylindrical and tapered shafts, and a dealer says it contains washers, O-rings and the primary seal. Part number 151-1166 is listed for 32 mm shafts and 35 mm tapered shafts in the same series.
The shaft decides the kit. Don’t order a Danfoss OMR 250 seal kit by size name alone, and don’t assume a kit listed for another OMR size covers yours. Danfoss also publishes a seal kit survey by motor type and warns that it can’t be used for special versions. Send Advance Hydraulic Works your nameplate part number, shaft diameter and flange type, and we’ll match them to a kit before anything ships.
How does the OMR 250 differ from the OMR 200 on a repair test?
Both give about 300 N·m continuous. The 200 does it at about 300 rpm and 110 bar. The 250 does it at about 240 rpm and 80 bar. That difference changes what a healthy motor looks like on a speed test.
At 45 L/min, a 200 should turn about 225 rpm, since 45,000 ÷ 199.8 is about 225. A 250 should turn about 180 rpm. Judge a healthy 250 by the 200’s figure and it looks 20% slow when nothing is wrong. Confirm displacement on the nameplate before you read the result.
Who makes the parts now?
A European reseller lists the 151-0716 as replaced by the OMR X 250, part number 11186667, made by White Drive Motors & Steering. Kramp lists a 151-1277 kit under the White brand as fitting the Danfoss number.
Parts from different makers can share dimensions and still differ inside. Check the datasheet for the exact kit or motor you’re offered.
Danfoss OMR 250 repair service: what it costs
These are overseas listings. None is an Advance Hydraulic Works price:
- Seal kit 151-127700 at €19.01 excluding VAT.
- White-brand 151-1277 kit at €31.05 excluding VAT.
- Danfoss-listed 1511277 kit at €48.17.
- An aftermarket 151-1277 kit at US$65.99.
- A 151-1166 kit for 32 mm shafts at €58.60, or €39.20 for the White version excluding tax.
- An OMR X 250 motor with 25 mm shaft at $280.00.
A kit fees a small fraction of a new motor, however it best enables whilst the motor is sound. For any Danfoss OMR 250 repair provider, ask for a written quote after inspection, Advance Hydraulic Works blanketed.
The method: symptom, speed, oil, version
- Symptom. Note where the oil leaks and whilst it began.
- Speed. Measure shaft speed at a acknowledged drift and compare it with the formulation.
- Oil. Check color, smell and filter out for water, warmness harm or metal.
- Version. Confirm part range, shaft length and flange from the nameplate.
A worked example
Two conveyor drives both weep at the shaft. Both are confirmed as 250s on a 45 L/min pump, so theory says about 180 rpm.
Motor A runs unloaded at 173 rpm, which is 96% of theory. Internal wear is small, and a kit should cure it. Motor B only reaches 123 rpm, or 68%. Oil is slipping inside, so a new seal will start leaking again soon. Motor B needs its gerotor set inspected and probably replaced.
If Motor A has a 25 mm shaft, a package offered for 32 mm or 35 mm tapered shafts is the wrong component, even though each belong to the OMR own family. This is illustrative arithmetic, so use the present day datasheet for your real motor.
Implementation steps
1.Photograph the nameplate, shaft and flange earlier than removal.
2.Write down the full component quantity, such as 151-0716, and observe any drain port.
3.Measure pace in opposition to waft and file the end result.
4.Inspect the oil and filter for water, heat and metal.
5.Send the entirety to Advance Hydraulic Works and ask which kit suits.
6.Ask the seller to nation the maker, part wide variety and warranty in writing.
7.Open the motor, look at every machined floor, replace all seals and O-jewelry, and reassemble using the Danfoss guide’s torque values.
8.Flush the strains, suit the motor, run it unloaded first, then at operating pressure at the same time as you watch temperature and noise.
The usual mistakes are ordering a kit by size name, skipping the speed test and refitting old O-rings.
FAQs
What is a Danfoss OMR 250 repair service?
Inspection, replacement of worn parts and seals, and a test before the motor goes back on the machine. Ask for the findings and test results in writing.
Which Danfoss OMR 250 seal kit do I need?
It depends on your part number and shaft. Kit 151-1277 is listed for 25.4 mm shafts and 151-1166 for 32 mm and 35 mm tapered shafts. Send your nameplate to Advance Hydraulic Works to confirm.
Can a seal kit fix a leaking Danfoss OMR 250?
Yes, if the leak is external and the motor runs near theoretical speed. If speed has dropped, the kit alone won’t fix it.
How do I know if my Danfoss OMR 250 is worn inside?
Speed falls well below flow × 1000 ÷ 249.3, and the motor may run hot under load.
Is Danfoss OMR 250 repair cheaper than buying new?
Usually, when the housing and shaft are intact. Compare a written repair quote with a replacement price. Advance Hydraulic Works can give you both.
Your next step
Run the speed test, photograph the nameplate, and send both to Advance Hydraulic Works. You’ll know whether you need a seal kit or a full rebuild before you spend anything.
