Quality Assurance from Your Hydraulic Supplier: What We Test Before Shipping

As a hydraulic supplier, our job is more than just moving boxes. Our reputation depends on the reliability of the parts our customers provide. Distributors can rely on us to fully test hydraulic components. Every time.

At HPS, we take our role as your technical partner seriously, ensuring that every component meets strict performance standards.

Here is a look at the critical testing phases we perform to give you confidence in your next quote.

The Importance of Hydraulic Control & Precision Testing

• Pumps are mounted on a universal mounting bracket. The physical connection between a pump and the stand’s motor is made with a universal driveshaft and adapters between the drive shaft and test pump shaft and oil from the reservoir. Discharge flow from the test pump is measured by a flow meter and restricted by a load valve before discharge flow is returned to the bench reservoir. Pumps are checked for efficiency at a rated working pressure and for external leaks.
• Motors are driven by a variable volume hydraulic pump on the stand. The test motor is mounted and connected in the same way pumps are tested. The motor's discharge flow is restricted with a load valve, putting the test motor under a workload. Motors are checked for efficiency at rated working pressure and for external leaks.
• Relief valves are pressurized and operated by the variable volume hydraulic pump on the stand. Flow returning from the valve is measured, and the relief valve is checked for internal leakage, external leakage, “cracking” pressure, pressure setting, and resetting pressure.
• Four-way valves and valve banks are pressurized by the variable volume hydraulic pump on the test bench. The valve spool is shifted to a direct oil to a blocked valve port and leakage past the spool is visually checked at the non-pressurized adjoining port, then valves are checked for external leaks.

Before any part leaves our facility, this rigorous bench testing both simulates the real-world operating conditions and looks for internal and external leaks. This technical oversight helps you sell a product that you know will work on day one.

Testing Brand-Specific Components: Vickers, Denison, and Rexroth

Distributors often deal with high-performance brands that require specialized knowledge, including:

• The tight tolerances required for a Vane Pump Vickers unit
• Denison pumps and Denison motors under varying heat cycles
• The demands of Denison valves and pumps

Rexroth electro-hydraulic pumps often use advanced electronics for precise pressure control.

When we test Rexroth electro-hydraulic pumps, we aren't just checking for rotation. We test the Rexroth solenoid valve response times. We ensure the Bosch Rexroth solenoid valve integrates perfectly with the pump’s control plate.

When we test a Denison vane pump or a Parker vane pump, we must maintain efficiency as the hydraulic fluid thins at high temperatures.

Our testing for hydraulic pump units includes:

1. Flow Analysis: Ensuring the GPM matches the manufacturer's spec.
2. Pressure Compensation: Verifying the pump destokes correctly at the set pressure.
3. Case Drain Flow: Measuring internal wear to ensure longevity.

Why Testing Matters for Your Bottom Line

• Faster Troubleshooting: If a machine has issues, you know the HPS part is not the problem.
• Better Quoting: You can justify a premium price with documented test results.
• Reduced Returns: High-quality remanufacturing means fewer warranty claims for you to process.