Dongfeng GX Steering gear to oil tank steering low-pressure oil pipe assembly 3405110-H12B1

The assembly features a streamlined structural design focused on maximizing low-pressure oil circulation efficiency between the steering gear and oil tank. The oil pipe adopts a smooth inner wall (with a surface roughness of Ra ≤ 0.8μm) to minimize fluid resistance, preventing pressure drops or oil flow blockages that could affect steering system responsiveness. Additionally, the pipe is shaped with gradual bends (rather than sharp angles) to reduce turbulence in the oil flow, ensuring a steady, consistent return of low-pressure oil from the steering gear to the tank. The end fittings are integrated with sealing gaskets or O-rings (pre-installed at the factory) to eliminate the risk of oil leakage, while the pipe’s overall rigidity is balanced to resist kinking during vehicle operation or maintenance

Oil Pipe Body: Constructed from high-grade nylon 12 (PA12) or reinforced EPDM rubber (depending on specific Dongfeng GX model requirements)—materials renowned for excellent resistance to automotive hydraulic oils (including mineral oil-based and synthetic steering fluids). These materials can withstand long-term exposure to oil without swelling, cracking, or degradation, maintaining structural integrity even at operating temperatures ranging from -30°C to 120°C.

End Fittings & Seals: The fittings are made of zinc-plated carbon steel or aluminum alloy, providing strong corrosion resistance to withstand under-hood moisture, dust, and road salt. The seals use nitrile rubber (NBR) or fluororubber (FKM), which offer superior oil tightness and compatibility with steering fluids, ensuring long-term leak-free performance

As a key component of the Dongfeng GX’s power steering system, this assembly fulfills three essential functions:

Low-Pressure Oil Return: It efficiently channels low-pressure hydraulic oil from the steering gear (after the oil has been used to assist steering) back to the oil tank, completing the hydraulic circuit and ensuring a continuous supply of oil for the power steering pump.

Oil Cooling Support: By routing the returned oil through the under-hood area (where airflow aids heat dissipation), the pipe helps reduce the temperature of the hydraulic oil, preventing overheating that could degrade oil performance or damage steering system components (e.g., seals, pumps).

Contaminant Retention Assistance: The smooth inner pipe design minimizes oil turbulence, which helps prevent the agitation of potential contaminants (e.g., tiny metal particles, debris) in the oil—reducing the risk of these contaminants clogging the steering gear or pump and extending the lifespan of the entire steering system

This assembly adheres to automotive industry quality standards, including China’s GB/T standards for hydraulic hoses and fittings, as well as ISO 10482 (standards for automotive fluid conveyance systems). Each unit undergoes comprehensive quality testing before shipment, including:

Pressure Leakage Testing: Subjecting the assembly to 1.5 times the maximum operating pressure (typically 0.5-1.0 MPa for low-pressure steering circuits) for 30 minutes to ensure no oil leakage.

Material Compatibility Testing: Immersing samples in standard steering fluids for 1000 hours to verify no material swelling, hardening, or oil absorption beyond acceptable limits.

Flexibility and Durability Testing: Bending the pipe through 10,000 cycles (mimicking vehicle vibration and movement) to ensure no cracks or structural damage.

Dimensional Accuracy Testing: Using laser measurement tools to confirm pipe length, bend angles, and fitting dimensions meet ±0.5mm tolerances.

It also comes with a manufacturer’s quality warranty, providing customers with confidence in its reliability and suitability for Dongfeng GX vehicles