| Series | O-Series |
|---|---|
| Type of Pump & Motor | Orbital Motor |
| Flow Rate (CC Per Rev) | 12.5 |
| Part Number | 151G0255 |
| Manufacturer | Danfoss Power Solutions |
| Motor Series | O-Series |
| Basic Motor | OMM |
| Displacement | 12,5 cm3/rev |
| Design Number | 3 |
| Port Style | Side ported - aligned |
| Check Valve | Yes |
| Gear Wheel Set | Standard |
| Front Bearing | Journal bearing |
| Rear Bearing | Journal bearing |
| Dust Seal | Standard |
| Seal Kit | 151G0202 |
| Packing | Single pack |
| Drain Port Style | Standard - End cover |
| Special Feature | Output shaft - special surface treatment |
| Port Size | G 3/8 |
|---|---|
| Shaft Size | Dia. 16 mm - M6 tap |
| Shaft Seal | NBR - Standard |
| Mounting Flange | 3 Bolt - Round |
| Mounting Thread Dimension | Pilot dia. 31,5 x 5 [1,24 x 0,20] - B.C. dia. 45 [1,77]; M6 |
| Shaft Style | Straight |
| Shaft Key | A5 x 5 x 16 mm (DIN 6885) |
| Port Dimension | G 3/8 |
| Drain Port Dimension | G 1/8 |
| Gerotor Width | 5.5 mm |
The Danfoss OMM 12.5 Rust Proof Shaft orbital motor (part number 151G0255) is a low-speed, high-torque gerotor motor from the Danfoss O-Series, with a displacement of 12.5 cm³/rev and side ported connections. Side porting routes hoses out of the motor body rather than the end cover, which is what you need when there is no clearance behind the motor.
Rust-proof output shaft
This variant carries a special surface treatment on the output shaft, intended for humid, washdown or marine-adjacent installations where a standard shaft would corrode at the seal face. Mechanically it is otherwise identical to the standard 12.5 cm³/rev side-ported OMM.
Mounting and shaft
A 3-bolt round mounting flange with a 31,5 mm pilot on a 45 mm bolt circle and M6 threads, so it drops into existing OMM installations. The output shaft is a straight 16 mm diameter with an M6 tap and an A5 x 5 x 16 mm key to DIN 6885.
Porting
Work ports are G 3/8 BSP, side ported and aligned, with a G 1/8 drain port in the end cover. An integral check valve is fitted as standard.
Construction and sealing
Journal bearings front and rear, a standard gear wheel set, standard dust seal and an NBR shaft seal. The matching service kit is seal kit 151G0202, common across the OMM range on this design number.
Selecting the right OMM
The OMM family shares mounting, shaft and porting across displacements, so sizing usually comes down to matching displacement to the torque and speed you need. Work it out with our hydraulic calculator, browse the full orbital motors and steering range, or ask an EMPH engineer to confirm the part for your machine.
