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Hydraulic Power Units

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Hydraulic Power Unit Repairs

Hydraulic power units (HPU) provide the energy necessary to run a huge variety of tools across multiple applications.

When it comes to HPU’s there are many specifications to consider, such as the horsepower of the engine or electric motor power supply, operating pressure, fluid flow, and capacity of the reservoir. In some cases, pre-made Hydraulic Power Units won’t meet all your needs.

Allied Hydraulic Service Co. becomes an extension of your workforce and a trusted partner to design and fabricate custom HPUs to meet your expectations.

Common Causes of Hydraulic Power Unit Failures

  1. Fluid Contamination: Contaminants such as dirt, water, and metal particles are the leading causes of hydraulic failures. These contaminants can enter the system during maintenance, through worn seals, or from inadequate filtration, causing abrasive wear and corrosion.

  2. Overheating: Overheating can degrade hydraulic fluid, reduce lubrication, and increase wear on components. It can result from high ambient temperatures, excessive load, or inadequate cooling systems.

  3. Liquid Leaks: Leaks often occur due to worn seals, loose fittings, or damaged hoses. They not only reduce system efficiency but can also pose safety hazards. Regular inspections are essential to identify and address leaks promptly.

  4. Aeration and Cavitation: Aeration and cavitation occur when air or vapor bubbles form in the hydraulic fluid, leading to noise, reduced efficiency, and component damage. Maintaining proper fluid levels and pressure settings can prevent these issues.

Our Repair Process

  • Initial Assessment
  • Our technicians begin with a thorough inspection of your HPU to identify the root cause of the problem.
  • We use advanced diagnostic tools to assess the condition of internal components and hydraulic fluid.
  • Disassembly & Cleaning
  • The unit is carefully disassembled, and all parts are cleaned to remove contaminants.
  • Components are inspected for wear and damage, and those beyond repair are replaced.
  • Component Replacement & Repair
  • We replace damaged parts with high-quality, OEM-compatible components.
  • Our team repairs any salvageable parts to restore their functionality.
  • Reassembly & Testing
  • The HPU is reassembled with precision to ensure all components fit correctly and function as intended.
  • We conduct rigorous testing under various operating conditions to verify the unit’s performance and reliability.
  • Performance Optimization & Customization
  • For custom power units, we design and build according to your specifications, ensuring optimal performance and efficiency.
  • We assist in layout and design to integrate the power unit into your existing system.
  • Updating & Restoring Old Systems
  • We can update outdated systems that no longer have parts availability.
  • We restore and modernize old power units, extending their lifespan and improving performance.
  • Documentation & Support
  • Every power unit serviced by Allied comes with a detailed manual, providing you with essential information for future maintenance.
  • Our team offers ongoing support to keep your hydraulic systems in top condition.
Our Services
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Frequently Asked Questions

Common symptoms include low-pressure readings, high temperatures, erratic or slow operation, and unusual noises. Identifying these signs early can help prevent major failures

Hydraulic fluid should be regularly tested and changed according to the manufacturer’s recommendations. This helps maintain fluid quality and system performance

Common types include petroleum-based, water-based, synthetic blends, and biodegradable fluids. Each type has specific applications and benefits​.

Regular maintenance should be performed based on the manufacturer’s guidelines, typically every 500 to 1,000 hours of operation (every 3-6 months depending on useage). This includes checking fluid levels, replacing filters, and inspecting components for wear and tear.

Overheating can be caused by several factors, including fluid contamination and excessive load. It’s essential to stop the operation immediately and consult our experts to diagnose and fix the issue.

Unusual noises such as whining, banging, or knocking can indicate issues such as air in the system, cavitation, or worn components. It is important to stop the system and perform a thorough inspection to identify and rectify the cause of the noise.

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