Structure and catalog model groups
| Series | Catalog structure | Model groups |
|---|---|---|
| JHM | Five-piston crankshaft connecting-rod radial piston motor | JHM1, JHM2, JHM3, JHM6, JHM11, JHM16, JHM31 |
| JNM | Oscillating-cylinder crankshaft radial piston motor | JNM05, JNM1, JNM2, JNM3, JNM4, JNM5, JNM6, JNM7 |
Model-level displacement references
The ranges below are actual catalog displacement references, not final operating limits. Pressure, speed and torque remain variant-specific.
| JHM model | Actual displacement | Source |
|---|---|---|
| JHM1 | 64–159 mL/rev | Catalog page 23 |
| JHM2 | 113–276 mL/rev | Catalog page 24 |
| JHM3 | 181–380 mL/rev | Catalog page 25 |
| JHM6 | 397–754 mL/rev | Catalog page 26 |
| JHM11 | 682–1301 mL/rev | Catalog page 27 |
| JHM16 | 1413–3041 mL/rev | Catalog page 28 |
| JHM31 | 2553–4828 mL/rev | Catalog page 29 |
| JNM model | Actual displacement | Source |
|---|---|---|
| JNM05 | 59–191 mL/rev | Catalog page 3 |
| JNM1 | 99–340 mL/rev | Catalog page 5 |
| JNM2 | 192–623 mL/rev | Catalog page 7 |
| JNM3 | 426–987 mL/rev | Catalog page 9 |
| JNM4 | 616–1316 mL/rev | Catalog page 11 |
| JNM5 | 807–2007 mL/rev | Catalog page 13 |
| JNM6 | 1690–3041 mL/rev | Catalog page 15 |
| JNM7 | 2007–4298 mL/rev | Catalog page 17 |
Interfaces decide interchangeability
Similar displacement does not make two motors interchangeable. Compare shaft form and capacity, mounting pilot and bolt pattern, port layout, drain arrangement, permissible back pressure and the applicable distributor or valve-plate interface. JHM valve-plate references such as D31, D47, D90 and D250 are model-group dependent; JNM shaft and distributor arrangements also require drawing confirmation.
Compare candidates under one duty
Start with the required output torque and continuous and peak speed, then screen specific JHM and JNM model rows against the available pressure and flow. Finish with the installation drawing and circuit conditions. The useful outcome is a short list of model-level candidates for the same duty—not a blanket conclusion that one family is better.
Technical information is provided for preliminary selection. Confirm the selected model, installation and application requirements before ordering.