SAIVS
  • HOME
  • ABOUT US
    • Honor
    • Manufacturing Capacity
    • Privacy Policy
    • Terms of Service
    • FAQ
  • PRODUCTS
    • Hydraulic Pumps
      • Rexroth
        • A2F Series
        • A4 F/V Series
        • A7VO Series
        • A8VO Series
        • A10V Series
        • A11V Series
        • PG Series
        • AZ Series
        • PV Series
      • Parker
        • PV-plus Series
        • P1 PD Series
        • PAVC Series
        • VP1 Series
        • PG Series
        • P2 P3 Series
      • Sauer-Danfoss
        • 45 Series
        • 90 Series
      • Eaton Vickers
        • PVM Series
        • PVH Series
        • PVQ Series
        • PVE Series
        • VMQ Series
      • Nachi
        • PVD Series
        • PVK Series
        • PVS Series
        • PZS Series
        • PZ Series
      • Hawe
        • V30 Series
        • V60N Series
      • Kawasaki
        • K3V Series
        • K5V Series
      • Sumitomo
        • QT Series
      • Linde
        • MPR Series
        • HPV-02 Series
        • HPR-02 Series
      • Vane Pumps
      • Gear Pumps
    • Hydraulic Motors
      • SAI GM Series Motor
      • Intermot Piston Motor
      • Hydraulic Cycloidal Motors
      • Rexroth Hydraulic Motor
      • Poclain Hydraulic Motor
    • Hydraulic Valves
      • Pressure Relay
      • Pressure Valve
      • Threaded Cartridge Valve
      • Flow Valve
      • Anti-explosion Valve
      • Proportional servo valve
      • Direction Valve
      • Directional Control Valves
    • Planetary Gearboxes
      • Rexroth
      • Bonfiglioli
      • Brevini
      • Dinamicoil
      • O&K
    • Hydraulic Cylinder
      • Aerial Work Platforms
      • Agricultural Equipment
      • Construction Equipment
      • Manufacturing Equipment
      • Marine
      • Material Handling
      • Mining
      • Road Service
      • Waste/Recycling
      • Cylinder Parts
    • Hydraulic Power Units
      • Scissor High Altitude Platform
      • Pallet Car
      • The Wing Car
      • Lift Platform
      • Automobile Tail Plate
      • Special Vehicle
    • Hydraulic Pump Parts
      • Parker Series
      • Komatsu Excavator Series
      • Hitachi Series
      • Rexroth Series
      • Sauer Danfoss Series
      • Uchida Series
      • Messori Series
      • Kayaba Series
      • Toshiba Series
      • Nachi Series
      • Eaton Vickers Series
      • Linde Series
      • Caterpillar Series
      • Kawasaki Series
      • Kobelco/Kato Series
      • Hawe Series
      • Sumitomo Series
    • Hydraulic Tools
      • Flange Tools
      • Hydraulic Lifting tools
        • Hydraulic pump
        • Hydraulic Cylinder/Jack
        • Hydraulic Professional Tools
      • Bolting Tools
        • Hydraulic Tensioners
        • Hydraulic Torque Wrench Pumps
        • Torque wrenches
      • Hydraulic Components
      • Electric Power Tools
    • Hydraulic System
    • Hydraulic Manifolds
    • Hydraulic Winch
    • Electro Hydraulic Actuators
  • APPLICATIONS
    • MOBILE
    • AGRICULTURE
    • INDUSTRIAL
    • ENERGY
    • FOOD & BEVERAGE
    • OIL & GAS
  • DOWNLOAD
    • Best PDF
  • CONTACT US
  • BLOG
HOME > BLOG

Mastering the Inner Workings of a Hydraulic Power Unit

Author:SAIVS Time:2024-03-04 Click:

In hydraulic power packs, the term "hydraulic power" refers to the process by which a system of piping connected 

by a pressurized fluid can generate, control, and transmit mechanical power from one point to another.


Principle of hydraulic power

How hydraulic power units Work

hydraulic power units, or hydraulic power packs, are self-contained systems that convert mechanical energy into hydraulic energy. 

They are used in various applications, including construction equipment, manufacturing machinery, and mobile hydraulics.

The basic components of a hydraulic power unit are a motor, a pump, a reservoir, and a control valve. 

The motor drives the pump, which in turn pumps hydraulic fluid from the reservoir. 

The control valve directs the fluid flow to the actuators, which are the devices that convert the hydraulic energy into mechanical energy.

Components of a Hydraulic Power Unit

A hydraulic power unit is a self-contained system that converts mechanical energy into hydraulic energy. 

It is the heart of a Hydraulic System and provides the power to operate hydraulic actuators such as cylinders and motors.

Several key components make up a hydraulic power unit, each playing a vital role in its operation and performance. 

Tipper Trailer Hydraulic Power Units

Here's a breakdown of the essential parts:

1. Motor Pumps

Every power unit has at least one motor pump, which is responsible for converting mechanical energy from the motor into hydraulic energy.

Some units may have multiple pumps for increased flow or pressure.

Pumps can be of various types, such as gear pumps, vane pumps, or piston pumps, 

each with its characteristics and suitability for different applications.

2. Filters

Hydraulic fluid cleanliness is crucial for system longevity and performance. 

Filters remove contaminants like dirt, metal particles, and debris from the fluid.

Most power units have at least one filter, often located near the pump inlet.

Some filters are self-cleaning, automatically removing contaminants and extending their lifespan.

Regular filter maintenance is essential to prevent system blockage and component wear.

3. Power Unit Controllers

The power unit controller is the brain of the system. 

It allows you to monitor and control various aspects of the unit, such as pressure, flow, and temperature.

Controllers can be simple manual units with basic switches and gauges or complex electronic systems with displays, 

data logging capabilities, and even remote control functionalities.


Hydraulic power packs schematic


4. Accumulators

Accumulators store hydraulic fluid under pressure and provide a surge of power when needed. 

They can also help to dampen pressure fluctuations and reduce system shock.

Accumulators are often used in applications requiring rapid actuator movement or high peak loads.

5. Coolers and Heaters

Hydraulic fluid needs to be maintained within a specific temperature range for optimal performance.

Coolers, typically located near the filter or return line, prevent overheating by dissipating excess heat.

In cold environments, heaters can be used to maintain the fluid temperature within the operating range.

6. Tanks

The hydraulic power unit tank serves as a reservoir for the hydraulic fluid. 

It also provides space for air separation and allows for the settling of contaminants.

Tanks can be of various sizes and designs, depending on the system's flow and capacity requirements.

Proper operation of a power unit is crucial for system functionality. 

Malfunctions in any component can disrupt the entire system, leading to failure. 

Regular maintenance is essential to prevent unnecessary wear and potential breakdowns. 

Delaying maintenance can result in costly downtime, an undesirable situation for any business.

By understanding the components of a hydraulic power unit and their functions, 

you can make informed decisions about selecting the right unit for your specific needs.


SAIVS is a trusted partner for hydraulic system solutions, offering maintenance and repair services for hydraulic power units from various manufacturers.

For more information on our power units or hydraulic system services, please get in touch with us. 


Tag: hydraulic power packs Hydraulic Power Units hyd power pack

Random Recommend

  • What is the characteristic of Rexroth hydraulic pump?
  • How Flange Alignment Tools Work
  • What is the reason for the failure of the hydraulic reversing valve?
  • How to choose an electrohydraulic jack
  • Internal Gear Pumps: A Complete Overview
  • Log No. 16:Hollow torque wrenches To Taiwan Customer
  • Precautions for using digital torque wrenches
  • Overview Of Hydraulic Bolt Tensioners
  • Design criteria in hydraulic cylinders
  • Corded vs. Cordless: Choosing the Right Hydraulic Power Tool for You

Related Products

Rexroth ZDR6D series pressure reducing valve, direct operated ZDR6DA ZDR6DB ZDR6DP

Rexroth ZDR6D series pressure reducing valve, direct operated ZDR6DA ZDR6DB ZDR6DP

EATON VICKERS PVE Series straight axle variable displacement pump

EATON VICKERS PVE Series straight axle variable displacement pump

SWP5000 Series Electric Hydraulic Torque Wrench Pumps

SWP5000 Series Electric Hydraulic Torque Wrench Pumps

1-6000 Nm Preset Torque Wrench,TG Series

1-6000 Nm Preset Torque Wrench,TG Series

Professional Made Dual-Metal Material Hydraulic Pumps For Fiat Tractors

Professional Made Dual-Metal Material Hydraulic Pumps For Fiat Tractors

ZCW-600 Fixed Torque Electric Shear Wrench

ZCW-600 Fixed Torque Electric Shear Wrench

Hydraulic Power-Units-For-Double-Scissors-Lift

Hydraulic Power-Units-For-Double-Scissors-Lift

Linde Hydraulic pump HPV-02 series

Linde Hydraulic pump HPV-02 series

Kawasaki Hydraulic pump K3VG series

Kawasaki Hydraulic pump K3VG series

Battery Powered Cable Cutter ED45/ED55/ED85/ED105

Battery Powered Cable Cutter ED45/ED55/ED85/ED105

  • ABOUT US

    • Honor
    • Manufacturing Capacity
    • Privacy Policy
    • Terms of Service
    • FAQ
  • PRODUCTS

    • Hydraulic Pumps
    • Hydraulic Motors
    • Hydraulic Valves
    • Planetary Gearboxes
    • Hydraulic Cylinder
    • Hydraulic Power Units
    • Hydraulic Pump Parts
    • Hydraulic Tools
    • Hydraulic System
    • Hydraulic Manifolds
    • Hydraulic Winch
    • Electro Hydraulic Actuators
  • APPLICATIONS

    • MOBILE
    • AGRICULTURE
    • INDUSTRIAL
    • ENERGY
    • FOOD & BEVERAGE
    • OIL & GAS
  • CONTACT US

    NO. 626 Yuncai Road,

    Yunlong Town, Yinzhou,

    Ningbo, Zhejiang, China.

    +86-574-88188161
    +8613905748980

    Monday - Friday:

    8:30 AM to 5:30 PM

    seo1@saivs.com

    Saivs industrial twitter youtube linkedin pinterest
Copyright © 2012-2024 Ningbo Saivs Machinery Co.,ltd. 
TAGS  SiteMap