OMT motor displacement and shaft loading review
OMT motors use a geroler gear set, disc flow distribution and tapered roller bearings in the output arrangement. The external shaft load still needs its own check; a hydraulic torque rating does not define the allowable belt or sprocket load.
OMT model data
| Model | Displacement cm3/rev | Continuous pressure differential MPa | Continuous torque N m | Maximum continuous speed rpm |
| OMT 160 | 161.1 | 20 | 470 | 625 |
| OMT 200 | 201.4 | 20 | 590 | 625 |
| OMT 230 | 232.5 | 20 | 670 | 536 |
| OMT 250 | 251.8 | 20 | 730 | 500 |
| OMT 315 | 326.3 | 20 | 950 | 380 |
| OMT 400 | 410.9 | 18 | 1080 | 305 |
| OMT 500 | 523.6 | 16 | 1220 | 240 |
| OMT 630 | 629.1 | 14 | 1318 | 196 |
| OMT 800 | 801.8 | 12.5 | 1464 | 154 |
Catalogue limits apply to the listed configurations. Maximum speed, torque and pressure are separate limits and are not a simultaneous operating point.
Comparing OMT 200 and OMT 400
OMT 200 lists 201.4 cm3/rev, 20 MPa continuous pressure differential, 590 Nm continuous torque and 625 rpm maximum continuous speed. OMT 400 lists 410.9 cm3/rev, 18 MPa, 1080 Nm and 305 rpm. The comparison shows why displacement, pressure and speed must be read together.
Compare the required torque at the intended running speed with the selected model data. A larger displacement changes the flow needed for a target speed; it does not establish a proportional increase in continuous torque. The selected shaft version and the operating point still determine which catalogue data apply.
Flow and speed for OMT 200
As a calculated example, assume 40 L/min reaches the OMT 200 with 201.4 cm3/rev displacement. Ideal motor speed is flow x 1000 / displacement, giving 40 x 1000 / 201.4 = approximately 198.6 rpm before volumetric losses. This is a flow estimate, not a measured BLINCE performance point or confirmation that the motor can deliver rated torque at that speed.
Actual speed and available torque depend on the operating point, oil conditions and motor losses. Use the relevant curve, starting data and inlet and outlet conditions to complete the selection. If the machine needs very low speed or changes load rapidly, include that duty explicitly in the enquiry.
OMT installation and ordering information
| Item | Details for the enquiry |
| Shaft | OMT shaft profile diameter key or spline usable length and external loading |
| Mounting | Flange form pilot bolt pattern and available space |
| Oil ports | Connection type position and hose clearance from the approved drawing |
| Return and drain | Outlet pressure and the drain arrangement for the supplied motor |
| Duty point | Required starting torque running torque speed and available flow |
For a conveyor, brush or rotary assembly enquiry, state whether the motor connects directly or through a belt, sprocket or gearbox. Include the load on the output shaft and its position. These are machine-duty examples; the actual configuration must be reviewed for its own hydraulic and mechanical requirements.
