4481000
Brand: Dongfeng
Model: H30
product name：Power Steering Oil Tank
Part Number: 4481000
Product Details
Comprehensive Professional Description: Dongfeng H30 Power Steering Oil Tank (Part No. 4481000)
1. Basic Overview & Core Functional Positioning
The 4481000 is an authentic original equipment manufacturer (OEM) power steering fluid reservoir, meticulously designed and manufactured exclusively for Dongfeng H30 compact sedan models, serving as a vital auxiliary component of the vehicle’s hydraulic power steering system. As a dedicated storage and buffer unit for power steering fluid, this oil tank undertakes several irreplaceable core functions: storing a sufficient volume of standard power steering fluid to supply the entire steering hydraulic circuit, buffering pressure fluctuations generated during the operation of the power steering pump and steering gear, separating air bubbles mixed in the hydraulic fluid to ensure stable steering power transmission, and filtering minor impurities in the fluid to prevent wear and blockage of precision hydraulic components such as the steering pump and control valve. It is an indispensable part for maintaining the smooth, stable operation of the power steering system and ensuring flexible, labor-saving steering control.
Mounted in a rational, easily accessible position within the Dongfeng H30 engine compartment, typically near the power steering pump and connected via high-pressure hydraulic hoses, the 4481000 oil tank forms a closed hydraulic circulation loop with the power steering pump, steering gear, and connecting pipelines. Unlike other engine fluid reservoirs, the power steering oil tank operates in a dynamic hydraulic system, requiring stable sealing, reliable pressure resistance, and efficient fluid storage to adapt to continuous steering operations and varying hydraulic pressures. For the Dongfeng H30, a practical compact sedan positioned for daily urban commuting, highway driving, and routine family use, the performance and integrity of this oil tank directly determine the quality of steering control.
A faulty, cracked, or leaking power steering oil tank will lead to insufficient hydraulic fluid, air intrusion into the steering system, and pressure loss, resulting in a series of steering faults including heavy steering, abnormal noise during steering, unstable steering wheel return, and even complete failure of the power steering function. These issues not only affect driving comfort but also pose significant safety hazards, especially during high-speed driving and sharp turns. As a genuine OEM component, the 4481000 power steering oil tank is produced in strict accordance with Dongfeng’s original factory engineering standards, featuring perfect fitment, stable sealing, and long-lasting durability, making it the only reliable replacement part for system maintenance, leak repair, and component renewal to restore the Dongfeng H30’s original smooth and responsive steering performance.
2. Premium Material Selection & Precision Manufacturing Process
The 4481000 power steering oil tank is constructed from high-performance automotive-grade engineering plastics and sealing materials, selected in strict compliance with Dongfeng’s OEM quality specifications and hydraulic system component standards. The materials are chosen to prioritize exceptional oil resistance, pressure resistance, aging resistance, low-temperature brittleness resistance, and thermal stability, adapting to the harsh operating environment of the engine compartment, including high temperatures, vibration, and long-term immersion in power steering fluid.
The main body of the oil tank adopts high-grade modified polypropylene (PP) and acrylonitrile butadiene styrene (ABS) composite engineering plastic, a premium material widely used for automotive hydraulic fluid reservoirs. This composite material offers outstanding resistance to corrosion and swelling from standard power steering fluid, maintaining stable structural hardness and toughness without softening, deforming, or cracking under long-term contact with hydraulic oil. It also exhibits excellent low-temperature resistance, remaining tough and non-brittle in cold winter conditions, and withstands high temperatures from the engine compartment without thermal deformation, ensuring the integrity of the oil tank under all climatic conditions.
The integrated oil inlet and outlet joints of the oil tank are made of high-strength reinforced plastic, with high tensile strength and fracture resistance to withstand the pulling force and vibration of connecting hydraulic hoses without breaking or loosening. All sealing components, including the tank cap gasket and body sealing rings, use high-grade nitrile rubber (NBR) or fluororubber, which are highly resistant to power steering fluid corrosion and high-temperature aging. These seals remain flexible and elastic for long periods, preventing hardening, cracking, and fluid leakage, ensuring a fully closed hydraulic system.
The manufacturing process of the 4481000 oil tank follows a fully automated precision injection molding workflow, using high-precision molds tailored to Dongfeng’s original factory design data. This ensures the tank body has a smooth internal surface, uniform wall thickness, and no defects such as pores, cracks, or flow marks that could cause structural weakness or leakage. The tank body adopts an integrated blow molding and injection molding process, eliminating the need for excessive splicing and enhancing overall structural strength. After molding, strict post-processing and trimming are performed to remove burrs and ensure precise dimensions of mounting brackets and pipe joints.
Before leaving the factory, every 4481000 power steering oil tank undergoes rigorous quality testing, including hydraulic pressure testing to verify leak-proof performance under rated working pressure, low-temperature and high-temperature cycle testing to simulate extreme environmental conditions, and drop and vibration testing to check structural robustness. Only units that pass all inspections are packaged and delivered, ensuring 100% compliance with OEM quality standards and reliable performance in service.
3. Structural Design & Key Functional Components
The 4481000 power steering oil tank features a compact, streamlined integrated structural design, specifically engineered to fit the limited engine compartment space of the Dongfeng H30. Its rational layout avoids interference with adjacent engine components, wiring harnesses, and pipelines, while optimizing fluid storage and hydraulic buffering efficiency. The core functional components include the main tank body, integrated fluid inlet and outlet ports, built-in filter screen, threaded oil filler cap with sealing gasket, mounting bracket, and internal fluid baffle.
The main tank body is designed with a moderate capacity, precisely matched to the demand of the Dongfeng H30’s power steering system, ensuring sufficient fluid reserve to compensate for slight fluid consumption and buffer pressure changes. The internal fluid baffle is a key structural feature, designed to slow down the flow of hydraulic fluid, separate air bubbles mixed in during system operation, and prevent foam formation. Effective degassing is critical to maintaining stable hydraulic pressure and eliminating abnormal noise and unsteady steering caused by air in the system.
A fine-mesh stainless steel filter screen is integrated at the fluid inlet of the oil tank, serving as a primary filtration device to trap metal shavings, rubber debris, and other minor impurities circulating in the hydraulic fluid. This prevents impurities from entering the precision components of the power steering pump and steering gear, reducing wear and extending the service life of the entire power steering system. The filter screen is firmly fixed inside the tank and does not fall off or become damaged during fluid circulation.
The oil filler cap is equipped with a tight sealing gasket and a built-in ventilation valve (pressure balance valve), which is a vital design detail. The ventilation valve maintains pressure balance between the inside and outside of the tank as fluid levels and temperatures change, preventing negative pressure buildup that could impede fluid flow and cause pump damage, while strictly preventing external dust, moisture, and impurities from entering the tank. The integrated mounting bracket is precision-molded to match the original mounting points in the Dongfeng H30 engine compartment, enabling stable, vibration-resistant fixation without shifting or shaking during vehicle operation.
The oil inlet and outlet ports are designed with standard tapered or bayonet interfaces, perfectly matching the original power steering hoses of the Dongfeng H30. The ports are textured and sized to ensure a tight, secure fit with the hoses, preventing fluid leakage and hose disconnection. The overall structure is smooth and rounded, eliminating sharp edges that could damage connecting hoses or surrounding components, ensuring safe and reliable long-term operation.
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