Dongfeng VL truck parts Right hydraulic lock 5002175-C4300

Equipped with a spool-type control valve and a pressure-sensitive check valve, the hydraulic lock delivers precise locking/unlocking performance with a response time of ≤0.8 seconds. It maintains stable locking force (≥18kN) even under maximum suspension load (up to 12 tons per side), preventing accidental release during rough road driving or parking on slopes. The check valve features a pressure retention rate of ≥98% over 24 hours, ensuring the suspension remains locked without pressure drop—critical for safe cargo handling. Testing confirms the lock operates smoothly within a temperature range of -40°C to 80°C, adapting to extreme cold or hot working environments (e.g., northern winters, desert hauling)

The lock body is forged from 45# carbon steel (heat-treated to HRC 28–32) with a tensile strength of 600 MPa, resisting deformation or cracking under high hydraulic pressure and mechanical impact. The internal piston is made of 20CrMnTi alloy steel, precision-ground to a surface roughness of Ra 0.8μm for minimal friction and wear. Sealing components use nitrile rubber (NBR) O-rings and polyurethane backup rings—resistant to hydraulic oil (ISO VG 46) and aging, ensuring leak-free operation for over 10,000 working cycles. Unlike low-grade locks with plastic components, this robust construction extends service life by 70% under frequent locking/unlocking operations (e.g., daily loading/unloading)

Integrated safety features prevent unexpected lock failure: a mechanical backup latch engages automatically if hydraulic pressure drops, holding the suspension in place to avoid sudden lowering. The lock body also includes a pressure relief valve that activates at 30MPa (125% of the VL’s system pressure), protecting internal components from overpressure damage caused by hydraulic system malfunctions. Additionally, the external dust cover (made of wear-resistant nylon) blocks dirt, gravel, and moisture from entering the hydraulic port, reducing valve clogging risks. These dual protection mechanisms comply with ISO 13849-1 safety standards, ensuring reliable operation in critical scenarios (e.g., off-road mining, mountainous transportation)

Designed for hassle-free replacement by fleet technicians, the hydraulic lock simplifies installation with user-friendly features. The mounting holes are drilled to H9 tolerance for perfect alignment with the VL’s chassis bolts, and the hydraulic ports are pre-threaded with anti-seize compound to ease fitting. The package includes 4 M12×35mm grade 8.8 high-tensile bolts, lock washers, and a tube of hydraulic oil (ISO VG 46) for post-installation priming. Installation takes 30–40 minutes: disconnect the old lock’s hydraulic lines, unbolt the lock body, secure the new lock to the chassis, reconnect the hydraulic lines, and test locking/unlocking functionality. Maintenance is minimal—only annual inspection of seals and pressure retention is required. Each unit undergoes pressure testing (24MPa static, 30MPa dynamic), leak detection, and dimensional checks, backed by a 24-month warranty against defects (e.g., oil leaks, valve failure, body cracking)