Table of Contents

Difference Between Hydraulic motor and Hydraulic Pump

Introduction

Hydraulic motors are rotary actuators. However, the name rotary actuator is reserved for a particular type of unit that is limited in rotation to less than 360 degree .A hydraulic motor is a device which converts fluid power into rotary power or converts fluid pressure into torque. Torque is a function of pressure or, in other words, the motor input pressure level is determined by the resisting torque at the output shaft. A hydraulic pump is a device which converts mechanical force and motion into fluid power. A hydraulic motor is not a hydraulic pump when run backward. A design that is completely acceptable as a motor may operate very poorly as a pump in a certain applications. Differences between a hydraulic motor and a hydraulic pump are given in Table

Hydraulic Pump Vs Hydraulic Motor :

Sr.no.	Hydraulic Motor	Hydraulic Pump
1.	It is a device for delivering torque at a given pressure. The main emphasis is on mechanical efficiency and torque that can be transmitted.	It is a device for delivering flow at a given pressure. The main emphasis is on volumetric efficiency and flow.
2.	Motors usually operate over a wide range of speed, from a low RPM to high RPM.	Pumps usually operate at high RPM.
3.	Most motors are designed for bidirectional applications such as braking loads, rotary tables.	In most situations, pumps usually operate in one direction
4.	Motors may be idle for long time (as in index table).	Pumps usually operate continuously.
5.	Motors are subjected to high side loads (from gears, chains, belt-driven pulleys).	Majority of pumps are not subjected to side loads. Usually pumps are pad mounted on power pack top and shaft is connected to the prime mover directly.