Dongfeng KC truck parts Power steering gear assembly 3401010-KM1Y0

Designed to reduce driver effort during heavy loads and low-speed maneuvering (e.g., parking, loading), the assembly features a high-torque hydraulic power assist system. It delivers a steering assist ratio of 18:1 (calibrated to Dongfeng KC’s weight and axle load), providing up to 80% reduction in steering force compared to manual systems—critical for drivers operating the truck for long hours. The hydraulic valve body uses precision-machined spool valves that adjust assist pressure dynamically based on vehicle speed: higher assist at low speeds (for easy turning) and reduced assist at high speeds (for stable highway handling). Rigorous testing confirms the system maintains consistent performance even in extreme temperatures (-30°C to 120°C) and under maximum load (up to 25,000kg gross vehicle weight), ensuring reliable control in all operating conditions

Built to withstand the harsh mechanical stresses of truck operation (vibration, road impacts, constant steering loads), the assembly uses rugged, high-performance components. The steering gear housing is crafted from 8mm-thick high-strength cast iron (HT300 grade), offering exceptional torsional rigidity and impact resistance—able to absorb shocks from rough terrain without cracking. The input and output shafts are made of hardened alloy steel (40Cr) with a surface hardness of HRC 55–60, preventing wear even after 200,000 km of use. Internal components (e.g., rack-and-pinion gears, hydraulic seals) are coated with wear-resistant materials: gears feature a nitriding treatment for reduced friction, while seals use high-temperature FKM rubber that resists degradation from hydraulic fluid and extreme heat. This design extends the assembly’s service life to over 150,000 km, reducing maintenance frequency for fleet operators

This assembly incorporates multiple safety mechanisms to prevent steering failure and protect the driver. It includes a pressure relief valve that automatically limits hydraulic pressure to 14 MPa (Dongfeng KC’s system specification), preventing damage to hoses, pumps, or the gear housing from over-pressurization. The input shaft features a shear pin that breaks under extreme torque (e.g., if the front wheel hits an obstacle), protecting the steering column and driver from sudden impact forces. Additionally, the hydraulic system uses a dual-filter design (in-line filter + reservoir filter) that removes contaminants (particles ≥ 10μm) from the hydraulic fluid, preventing valve clogging or gear wear caused by debris. These safety features meet international commercial vehicle standards (ISO 14229, SAE J1939), ensuring compliance with truck safety regulations and reducing accident risks

Engineered for efficient replacement in truck repair shops, this assembly simplifies installation and upkeep. It comes with pre-assembled mounting brackets, hydraulic line fittings, and a detailed installation guide—installation takes 60–90 minutes using standard hand tools (no specialized equipment required). The hydraulic connections use quick-disconnect fittings that eliminate the need for flaring or threading, reducing installation errors and leak risks. For maintenance, the assembly features a easily accessible fluid fill port and dipstick, allowing technicians to check fluid levels without disassembling components. It also uses a universal hydraulic fluid (compatible with Dongfeng KC’s OEM specifications), eliminating the need for specialized fluids. Backed by a 36-month warranty against manufacturing defects (e.g., gear wear, seal leakage, valve failure), this assembly provides reliable performance and peace of mind for Dongfeng KC truck owners