Dongfeng VR truck parts Left Hydraulic Lock Bolt Assembly 5002170-C1102

Engineered to deliver robust, reliable locking force for critical components (e.g., tilted cab or cargo compartments), the assembly features a single-acting hydraulic cylinder that generates a maximum locking force of 9,200N—exceeding the VR’s cab tilt locking requirement of 7,500N by 23%. A built-in pressure relief valve (set to 20 MPa) prevents overpressure damage to the cylinder, while a one-way check valve maintains locking force for 96+ hours without hydraulic input (critical for safe cab maintenance). The lock bolt’s 50mm stroke is optimized to fully engage the VR’s locking notch, ensuring zero play even under extreme road vibration. Unlike mechanical lock bolts that rely on manual effort and risk incomplete engagement, this hydraulic design enables automatic, uniform locking in 0.7 seconds—reducing operator error and enhancing safety

Built to withstand repeated locking cycles and high mechanical stress, the assembly uses premium materials for core components. The lock bolt is forged from 42CrMo alloy steel (heat-treated to HRC 43–46) with a tensile strength of 1,150 MPa—resisting bending, shearing, or deformation even under uneven loads. The hydraulic cylinder barrel is made of 25# seamless steel tubing (3.5mm wall thickness) with a precision-honed inner surface (Ra 0.3μm) that minimizes piston friction and prevents oil contamination. The cylinder’s piston seal is crafted from fluororubber (FKM) that tolerates temperatures from -35°C to 130°C, maintaining a tight seal in extreme cold or engine bay heat. Unlike low-grade steel assemblies that fail after 30,000 cycles, this heavy-duty design endures 120,000+ locking cycles (equivalent to 10 years of heavy use) without performance degradation

Designed to resist corrosion from hydraulic oil, road salt, and moisture (common in underbody environments), the assembly features comprehensive protection. The lock bolt’s surface is coated with a zinc-nickel alloy (20μm thickness)—passing 1,300 hours of neutral salt spray testing without rust, 18x more durable than standard zinc plating. The hydraulic cylinder exterior is coated with a two-component epoxy primer (90μm) and polyester topcoat (60μm) that resists chemical damage from hydraulic fluid or road deicers. All hydraulic connections use double O-ring seals (FKM material) that provide redundant sealing and resist oil swelling. The mounting brackets are hot-dip galvanized (zinc coating ≥100μm) to prevent rust at attachment points. Unlike unprotected assemblies that leak or corrode, this design maintains reliability in rain, snow, or coastal environments

Designed for hassle-free replacement by fleet technicians, the assembly simplifies installation and upkeep. It includes a complete hardware kit: 4 M12×40mm high-tensile bolts, lock washers, hydraulic quick-connect fittings (compatible with the VR’s existing lines), and a torque guide (100 N·m for mounting bolts, 40 N·m for hydraulic fittings). Installation takes 28–33 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 (e.g., hydraulic flush equipment) required. Maintenance is minimal: only semi-annual inspection of connections and seal integrity, as the hydraulic oil acts as a self-lubricant. Each unit undergoes pressure testing (22 MPa for 8 minutes, no leakage), dimensional verification via CMM, and corrosion resistance checks, backed by a 30-month warranty against defects (e.g., bolt cracking, cylinder leakage, seal failure)