3 Quality Indicators for Distributors

For auto parts distributors and repair shops, the return rate on Hydraulic Power Steering Gears can be a major headache. Hydraulic units are complex; a microscopic imperfection can lead to leaks and warranty claims.

To ensure you are stocking or installing high-quality units, evaluate your suppliers based on these three technical criteria:

1. Seal Quality and Provenance
The seal is the weakest link in any hydraulic system. Premium steering gears utilize high-grade seals from reputable OEM suppliers (like NOK or Corteco) rather than generic rubber components. These seals must withstand extreme temperature fluctuations and high-pressure spikes without hardening or cracking.

2. Shaft Surface Finishing
The condition of the rack shaft is non-negotiable. Top-tier manufacturers use centerless grinding and polishing to achieve a specific surface roughness (Ra) value. If the shaft is too smooth, it won’t retain lubrication; if it is too rough, it will shred the seals like a file.

3. Comprehensive Pressure Testing
Never source hydraulic gears that haven’t been functionally tested. A reliable supplier performs a computerized test on every unit, simulating real-world driving conditions. This includes checking for internal bypass leaks (which cause heavy steering) and external leaks under maximum pressure loads.

Conclusion
In the hydraulic steering market, quality control is everything. Partnering with suppliers who prioritize precision sealing and rigorous testing ensures customer satisfaction and minimizes costly returns.