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Hydraulic Repair Guides​ 

specifying INDUSTRIAL HYDRAULIC power units

11/3/2025

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What to consider in specifying INDUSTRIAL HYDRAULIC power units:
  • SAFETY concerns
  • Functions of actuators (for valves mounted on power units)
  • Duty cycle on machine
  • Desired cycle times each actuator
  • Replacing existing HPU or new machine
  • Noise specifications
  • Space limitations
  • Hydraulic fluids to be used
  • Electric motor specifications and control power specifications
  • Indicators for over pressure, heat, and dirty filter electrical or visual
  • ​Operational life of system
  • Filter specifications or component specifications
  • Cooling requirements
  • Custom or standard reservoir layout
  • Customer suggestions or preferences
Should You Need Any Clarification On Above See Below:

I. Safety, Regulatory, and System Foundation
These are the foundational requirements that define the core parameters of the project.
​
  • SAFETY concerns: Always evaluate potential risks associated with high-pressure systems, fluid leaks, and overheating. Ensure the unit includes appropriate safety mechanisms and complies with relevant industry standards.
  • Functions of Actuators (for valves mounted on power units): Clarify the roles of actuators, especially for sizing control valves mounted directly on the power unit. Their function will influence the design and control logic of the entire system.

II. Performance and Functional Requirements
These factors define the HPU's performance capabilities based on the machine's operation.
​
  • Duty cycle on machine: Determine the duty cycle of the machine, how often and how long it operates.
  • Desired cycle times each actuator: Define the desired cycle times for each actuator to ensure the HPU can meet performance expectations without overloading.
  • Replacing existing HPU or new machine: Are you replacing an existing HPU or designing for a new machine? Replacement projects may require compatibility with legacy components, while new installations offer more flexibility in design.

III. Component, Environment, and Maintenance
These elements address the physical integration and ongoing health of the system.

  • Noise specifications: Noise can be a critical factor, especially in environments with strict acoustic regulations or where operator comfort is a priority. Look for units with noise-reduction features or enclosures.
  • Space limitations: Evaluate the physical space available for the HPU. Compact designs or custom layouts may be necessary to fit within tight footprints.
  • Hydraulic fluids to be used: The type of hydraulic fluid affects system performance, maintenance, and compatibility with seals and components. Consider temperature range, viscosity, and environmental impact.
  • Electric motor specifications and control power specifications: Define the electric motor specifications, including horsepower, voltage, and phase. Also, detail control power requirements for sensors, indicators, and automation systems.
  • Indicators for over pressure, heat, and dirty filter electrical or visual: Incorporate indicators electrical or visual for overpressure, overheating, and dirty filters. These help with preventive maintenance and reduce downtime.
  • Operational life of system: Estimate the expected operational life of the system and select components that match or exceed that timeline. This helps avoid premature failures and costly replacements.
  • Filter specifications or component specifications: Proper filtration is essential for system health. Specify filter ratings and component tolerances to maintain fluid cleanliness and protect sensitive parts.
  • Cooling requirements: Hydraulic systems generate heat. Determine if passive cooling is sufficient or if active cooling (e.g., heat exchangers or chillers) is required.

IV. Final Design and Partnership Details
These factors cover the final physical construction and alignment with the customer's needs.

  • Custom or standard reservoir layout: Decide between a custom or standard reservoir layout based on space, fluid volume, and maintenance access. Custom designs may offer better integration but come at a higher cost.
  • Customer suggestions or preferences: Don't overlook customer suggestions and preferences. Their insights can guide decisions on usability, aesthetics, and integration with existing systems.
The Power of Partnership: Moving Beyond the Checklist

You've just reviewed 15 critical factors for HPU specification. While this checklist is essential, turning these requirements into a robust, high-performing system requires a Certified Fluid Power Specialist who can foresee integration issues and optimize component choices.

That is where Progressive Power & Control steps in.

DO YOU HAVE A NEED FOR POWER ON DEMAND, POSITION, SPEED and TORQUE SERVO ACCURACY with flexible design and quiet operation.
Talk with a Specialsit
Need a Quick Answer?
If you have immediate questions about component sizing, motor power, or noise reduction, call us directly.

Contact Information:
  • Local Phone: 317-849-5115
  • Toll-Free: 800-875-5196

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© 2025 Progressive Power & Control. Indiana’s Trusted Fluid Power Distributor.
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Indianapolis, IN 46256
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Local phone: 317-849-5115
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  • Hydraulic Parts & Repair
    • Hydraulics Parts Vendors
    • Hydraulic Parts Repair and Remanufactured Parts
    • Emergency Hydraulic Repair & Replacement
  • Systems
    • JIE Drive
    • Mobile Hydraulics
    • Hydraulic Power Units >
      • Poclain Hydraulic Power Units
      • Nachi Hydraulic Power Units >
        • Nachi Servo Power Units
      • Yuken Hydraulic Power Units
    • Custom Hydraulic Systems and design
  • About PPC
    • Contact
    • Training
    • Hydraulic Repair Guides
    • Terms and Conditions
  • Quick Quote