Dongfeng KR truck parts Right Hydraulic Lock Bolt Assembly 5002175-C5100

At the core of the assembly is a high-pressure hydraulic cylinder that delivers consistent locking force for critical truck components (e.g., cab tilt mechanisms, cargo doors). It features a rated working pressure of 18 MPa (2,610 psi) and a lock bolt stroke of 35mm—generating 1,400N of clamping force to keep components securely locked during driving, even on rough terrain. The hydraulic circuit includes a one-way check valve that maintains pressure in the cylinder if the main hydraulic system loses pressure, preventing accidental unlocking (a key safety feature for cab tilt locks). Unlike mechanical lock bolts that wear out and loosen over time, this hydraulic design ensures zero play in the locked position and requires no manual adjustment—delivering reliable performance for 100,000+ lock/unlock cycles (equivalent to 5 years of heavy use)

Built to withstand the high forces and vibration of hydraulic locking systems, the assembly uses premium structural steel for key components. The lock bolt is crafted from 40Cr alloy steel (heat-treated to HRC 38–42) for exceptional tensile strength (980 MPa) and wear resistance—enduring repeated sliding contact without deformation or galling. The cylinder housing is made of 20# seamless steel tubing (wall thickness 5mm) that resists burst pressure up to 45 MPa (3x the rated working pressure), ensuring safety even in hydraulic system overpressure scenarios. The mounting bracket is 6mm-thick Q345B steel with welded reinforcements at stress points, preventing bending under load. Unlike aluminum or low-carbon steel components that fail under high stress, this heavy-duty steel design maintains structural integrity for 8+ years

Engineered to eliminate hydraulic fluid leaks (which compromise lock performance and damage surrounding components), the assembly integrates a multi-stage sealing system. The cylinder piston uses a polyurethane U-cup seal (70 Shore A hardness) with a backup ring that prevents extrusion under high pressure—maintaining a tight seal even after 50,000+ cycles. The hydraulic port connections feature O-ring face seals (Viton material, resistant to hydraulic oil and temperature extremes) that create a metal-to-metal seal with the quick-disconnect coupling. The lock bolt’s sliding interface is fitted with a PTFE wiper seal that removes dirt and debris from the bolt surface, preventing contamination of the hydraulic fluid. These seals meet ISO 7241-1 hydraulic connection standards and withstand temperatures from -30°C to 120°C—ensuring leak-free operation in all weather conditions

Designed for hassle-free service by fleet technicians, the assembly simplifies installation and upkeep. It includes all necessary hardware: 4 M8×25mm high-tensile bolts, lock washers, and a tube of hydraulic thread sealant for port connections. Installation takes 25–30 minutes: remove the old lock bolt, clean the mounting surface, align the new assembly with the bracket, torque the bolts to 32 N·m, and connect the hydraulic coupling (audible “click” confirms secure fit). The assembly requires minimal maintenance: a visual leak check every 6 months and replacement of the wiper seal every 2 years (a 5-minute task with no special tools). Unlike complex hydraulic locks that require specialized service equipment, this design allows on-site repairs—reducing downtime for the truck. Each unit undergoes pressure testing (24 MPa for 1 hour), leak verification, and cycle testing, backed by a 24-month warranty against defects (e.g., cylinder leakage, bolt bending, seal failure)