The Parker Nichols 716 Series is a two-speed gerotor motor using two separate power elements on a common shaft. An integral selector valve shifts between high torque, low speed (parallel) operation and high speed, low torque (series) mode in a ratio of 2:1.
The use of two power elements eliminates the deficiencies of traditional, single power element designs.
In the high torque mode, the motor delivers twice the torque and half the speed compared to high speed mode. The selector valve can be open or closed centre and may be actuated by an external pilot or optional solenoid valve. The open centre selector valve can be shifted while the motor shaft is rotating under load.
The selector valve is spring-loaded to return to its pilot-pressure-off position. Normal mode of operation is field changeable and can be selected as series or parallel. Pilot pressure must be 300 psi higher than motor case or outlet pressure and may be as high as typical hydraulic system operating pressure.
The Parker Nichols 716 motor has shafts up to 7/8″ nominal and is available as:
- Series: 072 | 108 | 142 | 176 | 212 | 258
- Parallel: 072 | 108 | 142 | 176 | 212 | 258
Contact us for further technical details and configuration options.