Dongfeng VR truck parts Left Hydraulic Lock Bolt Assembly 5002170-C1100

Designed to deliver strong, consistent locking force via hydraulic power, the assembly features a dual-stage hydraulic cylinder that generates a maximum locking force of 8,500N—securing critical components (e.g., tilted cab or cargo door) even under road vibration or uneven loads. The hydraulic system uses a pressure-relief valve (set to 18 MPa) that prevents overpressure damage, while a check valve maintains locking force for 72+ hours without hydraulic pressure input (ensuring safety during maintenance). The lock bolt’s stroke (45mm) is optimized to match the VR’s locking interface gap, enabling full engagement in 0.8 seconds (30% faster than manual lock bolts). Unlike mechanical lock bolts that require manual force and risk incomplete locking, this hydraulic design ensures automatic, secure locking with minimal operator effort, reducing human error

Built to withstand the high mechanical stress of locking and hydraulic pressure, the assembly uses premium materials for core components. The lock bolt is crafted from 40CrNiMoA alloy steel (heat-treated to HRC 42–45) with a tensile strength of 1,100 MPa—resisting bending or shearing under extreme loads. The hydraulic cylinder barrel is made of 20# seamless steel tubing (3mm wall thickness) with a honed inner surface (Ra 0.4μm) that reduces piston friction and prevents oil leakage. The cylinder’s piston seal uses high-temperature resistant nitrile rubber (NBR) that tolerates temperatures from -30°C to 120°C, maintaining sealing performance in harsh environments. Unlike low-grade steel assemblies that deform or leak, this heavy-duty design ensures reliable operation for 100,000+ locking cycles (equivalent to 8 years of use)

Engineered to resist corrosion from hydraulic oil contaminants, road salt, and moisture, the assembly features multi-layer protection. The lock bolt’s surface is coated with a zinc-nickel alloy (18μm thickness) that passes 1,200 hours of neutral salt spray testing without rust—15x more corrosion-resistant than standard zinc plating. The hydraulic cylinder exterior is painted with epoxy resin (80μm thickness) that resists chemical damage from hydraulic oil or cleaning agents. All hydraulic connections use O-ring seals (made of fluororubber, FKM) that provide permanent sealing and resist oil swelling. The assembly’s mounting brackets are hot-dip galvanized (zinc coating ≥90μm) to prevent rust at attachment points. Unlike unprotected assemblies that corrode or leak, this design maintains performance in wet, salty, or dusty conditions

Designed for hassle-free replacement by fleet technicians, the assembly simplifies installation and upkeep. It includes all necessary hardware: 4 M12×35mm high-tensile bolts, lock washers, hydraulic quick-connect fittings (compatible with the VR’s hydraulic lines), and a user manual with torque specifications (95 N·m for mounting bolts, 35 N·m for hydraulic fittings). Installation takes 30–35 minutes: disconnect the old assembly’s hydraulic lines and mounting bolts, align the new assembly with the VR’s brackets, secure the bolts, and connect the hydraulic lines—no specialized tools required. The assembly requires minimal maintenance: only annual inspection of hydraulic connections and seal integrity, with no need for lubrication (the hydraulic oil acts as a lubricant). Each unit undergoes pressure testing (20 MPa for 5 minutes, no leakage), dimensional verification, and corrosion resistance checks, backed by a 24-month warranty against defects (e.g., bolt bending, cylinder leakage, seal failure)