Hydraulic Power Units (HPU)

Progressive Power & Control in Indianapolis designs and builds innovative custom hydraulic power units for industrial and mobile applications. We are also a distributor for the following brands of hydraulic power units:

Custom-built hydraulic power unit - overhead reservoir type

About Hydraulic Power Units

The hydraulic power unit (HPU) serves as the main power source behind any hydraulic system. A hydraulic power unit can be comprised of:

  • a pump - to transform mechanical power into hydraulic power
  • a motor - to transform hydraulic power to mechanical power
  • valves - to control direction/pressure/volume of fluid
  • filters - to keep the hydraulic fluid clean
  • gauges - to monitor pressure and performance
  • a fluid reservoir - to contain the hydraulic fluid
  • hoses and fittings

Many other components can be added to enhance the function, including manifolds, cooling fans, heat exchangers, filtration systems, relief valves, pressure switches, etc. Hydraulic power units can be custom-built as stand-alone units for external use, built to be integrated into any machine tool space, or as portable units on wheels.

Hydraulic Power Units (or Power Packs) can be purchased “as is” in basic configurations from many vendors. Some vendors are also able to customize their standard models to suit your needs. When an off-the-shelf hydraulic power unit won’t suffice, Progressive Power & Control can design a custom HPU to suit your needs exactly. Using best-of-breed components, we can design and assemble a hydraulic power unit that fits perfectly into your hydraulic circuit to provide the power you need. Smart external HPU design includes all components fitting within the framework so that they are safe from damage during delivery, moving, or by passing vehicles on the manufacturing floor, and the use of a drip edge to contain oil leaks from running out onto the work floor. Internal power packs can be designed to fit perfectly into any machine tool and provide the power needed to drive the machine.

Since the reservoir is frequently the largest part of a power unit, the orientation of the reservoir usually determines the shape of the HPU. Each design style has it's benefits.

Vertical HPUs (sometimes called Overhead)

Minimizes the footprint of the device on the manufacturing floor and also provide a "flooded inlet" where gravity adds to the steady flow of oil into the pump.

Horizontal HPUs (sometimes called Flat Top)

Have the reservoir on the bottom and the hydraulic components placed on top of the reservoir. This makes for convenient servicing of the hydraulic components. Disadvantages include a larger footprint and the need to pull hydraulic fluid up from the reservoir into the pump.

L-shaped HPUs

Offer the advantages of horizontal power units with hydraulic components easily accessible for servicing while providing a flooded inlet, which uses gravity to assist the flow of oil into the pump. Generally, the reservoir is placed on the back of unit in an upright position with the hydraulic components placed in front of the reservoir.

Portable Hydraulic Power Units

Portable hydraulic power units can be built on wheeled carts and rolled into position when needed.

JIC- or NFPA-compliant hydraulic power units can be configured with any size and shape of reservoir, cooling systems, filtration systems, and valving in any position to fit into your manufacturing line.

Design issues to consider in selecting the proper hydraulic power unit:

  • Size and shape to fit your needs
  • Required operating pressure range
  • Required flow range
  • Power consumption and power sources
  • Reservoir capacity
  • Filtration
  • Need for cooling
  • Safety concerns for operator
  • Need for a drip edge to prevent oil spills
  • JIC or NFPA design compliance

Motor Types:

  • Electric motors from 2hp to 150hp - AC or DC
  • Air driven motors
  • Variable Frequency Drives (VFD)
  • Energy-efficient servo motors
  • Pneumatically-operated HPUs

Pump Types:

  • Standard gear pumps
  • Internal gear pumps
  • Piston pumps
  • Vane pumps

Reservoir Types and Positions:

  • Vertical reservoirs
  • Horizontal reservoirs
  • Flat-top reservoirs
  • L-shaped reservoirs

Hydraulic Power Units are used in many industries:

  • Mobile machines and construction equipment
  • Well drilling/Geothermal exploration
  • Farm equipment
  • Marine equipment
  • Manufacturing machine tools
  • Industrial automation
  • Steel milling machinery
  • Metal rolling and stamping machines
  • Material handling systems
  • Wood and paper mill machines
  • Food processing


Verical-style hydraulic power unit

Vertical-style Hydraulic Power Unit (shown above)

  • Control Box
  • Return Line Filter
  • Heat Exchanger
  • Pressure Gauges

Nachi custom horizontal flat-top hydraulic power unit

Nachi Horizontal Hydraulic Power Unit (shown above)

  • Piston pump
  • Reservoir
  • Return Line Filter
  • Electric motor
  • Separate valve package


Nachi Horizontal Hydraulic Power Unit (shown above)

  • Piston pump
  • Reservoir
  • Return Line Filter
  • Electric motor
  • Separate valve package

Nachi vertical hydraulic power unit

Nachi Custom Vertical Power Unit (shown above)

  • Flooded Inlet
  • Vertical Reservoir
  • Return Filter
  • Pressure Gauge
  • Site Level Gauge with thermometer

Nachi horizontal hydraulic power unit with pressure-compensated vane pump

Nachi Horizontal Hydraulic Power Unit (shown above)

  • Pressure-compensated Vane Pump
  • Relief Valve
  • Return Line Filter
  • Pressure Gauge
  • Shut-off Valve

Nachi power pack

Nachi Compact Horizontal Hydraulic Power Unit (shown above)

  • Piston Pump
  • Case Drain Cooler
  • Electric Motor

Nachi HPU with integrated valve package

Nachi Custom Horizontal Hydraulic Power Unit (shown above)

  • Piston Pump
  • Relief Valve
  • Return Line Filter
  • Control Box
  • Integrated Valve Package

L-shaped hydraulic power unit

L-shaped Hydraulic Power Unit (shown above)

  • Directional Valves
  • Terminal Box
  • Pressure Switches
  • Accumulator

Vertical HPU with pressure switches

Vertical Hydraulic Power Unit with Drip Rail (shown above)

  • Electrical Control Cabinet
  • Terminal Box
  • Pressure Switches
  • Accumulator
  • Drip Rail

Large overhead hydraulic power unit with multiple motors

Large Overhead Hydraulic Power Unit (shown above)

  • Overhead Reservoir
  • Multiple Motors
  • Custom Valving
  • Drip Rail

Pneumatically-operated pumps on a double L shaped hydraulic power unit

Hydraulic Power Unit with Pneumatically-operated Pumps

  • Electric Controls
  • Directional Valves
  • Manifolds
  • Pressure Control Station

Portable hydraulic power unit on whells

Portable Hydraulic Power Unit

  • Reservoir on bottom
  • Electrical control panel
  • Custom valving
  • Built on wheeled cart

custom horizontal HPU with drip pan

Custom Hydraulic Power Unit with Drip Pan

  • Horizontal style
  • Custom valving