What are Hydraulic Power Units ? 

It is quantity the basic subsystem of hydraulic system in which pump, motor, reservoir, mechanical coupling, strainer filter etc. are assemble into single combined unit known as hydraulic power pack. It works to apply the hydraulic pressure.

Hydraulic power pack

How Does a Hydraulic Power Pack Work?

A hydraulic system employs enclosed fluid to transfer energy from one point to another, and subsequently create rotary motion, linear motion, or force. The power pack provide the power needed for this transfer of fluid.

Unlike standard pumps, hydraulic power units use multi-stage pressurization networks to move fluid, and they often incorporate temperature control devices. The mechanical characteristics and specifications of a hydraulic power unit dictate the type of projects for which it can be effective.

Hydraulic Power Pack / Unit Components 

Reservoir : It is used to store quantity of oil. It is provided with level indicator to know the level of oil in the tank. The oil passes through the various elements and pipes lines and circulated back to the reservoir tank. It has capacity in the liters of hydraulic fluid.

hydraulic power pack

Filter : It is provided along with the tank to remove containments from the oil. It is used to supply pure and clean oil to the system. It can be used to fill or empty the tank by activating a multi-directional valve. Because they are self-contained, filters can often be replaced while the power unit is functioning.

Hydraulic filter

Pump : The pump is used to increase the pressure of oil. It convert ‘mechanical energy’ into ‘hydraulic energy’ to supply pressurised oil to the hydraulic system e.g. Gear pump, Screw pump, Vane pump.



Motor : The pump is driven with the help of driving arrangement by using prime mover commonly known as motor.

Control valves : They are provided to control pressure, flow, direction of oil in the system.

Types of control valve
  • Direction control valve : It is used to supply the oil in the directions to operate the hydraulic actuator in to and fro ( forward and reverse) directions. It changes the oil flow direction as per requirements.
  • Flow control valve : It is provided to control quantity of oil supplied to the actuator to obtain slow or fast movement as per requirements.
  • Pressure control valve : It is provided to protect the system from over load of pressure of oil. It is a safety device for the hydraulic system.

Accumulators: These are containers that can be attached to the hydraulic actuators. They collect water from the pumping mechanism and are intended to build and maintain fluid pressure to supplement the motor pumping system.

Gas charged accumulator

Coolers and Heaters: As part of the temperature regulation process, an air cooler can be installed near or behind the filter unit to prevent temperatures from rising above operational parameters. Likewise, a heating system, such as an oil-based heater, can be used to elevate temperatures when necessary.

Also read…

By Aditya

Hi, I’m Aditya Sharma, a professional blogger from Gurgaon, India and I launched this blog called aadityacademy on July 2021. aadityacademy.com is a mechanical Project-oriented platform run by Aditya sharma and I got the motivation to start aadityacademy blog after seeing less technical education information available on google.

48 thoughts on “What is Hydraulic Power Pack | Component and Working process”
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