Overseas mountainous and hilly areas have dense slopes, sharp bends, and steep slopes, which are typical working conditions with the highest losses and risks in heavy truck transportation. Compared to driving at a constant speed on plain main roads, long-term steep slope start stop, long downhill braking, and pressure on bends will continue to increase the load on truck braking, chassis, engine, and transmission systems, making it prone to problems such as brake thermal attenuation, chassis fatigue, insufficient power, and premature component failure. Many fleets continue to use plain vehicles, leading to a surge in vehicle failure rates and high maintenance costs. Mastering the exclusive protection logic and driving skills for steep slopes in mountainous areas can effectively reduce operating losses, avoid safety hazards, and extend the service life of the entire vehicle.
Scientific braking on long downhill slopes is the core key to driving in mountainous areas. Most drivers habitually slide in neutral and frequently apply brakes to control speed when going downhill, which is the most damaging and dangerous operation on steep slopes. Continuous foot pedal braking can cause rapid accumulation of heat in the brake pads and brake drums, leading to brake heat attenuation, resulting in softer brakes, decreased braking force, and in severe cases, direct brake failure. The correct operation is to shift into low gear in advance, use engine assisted braking to restrain the vehicle speed, cooperate with the water spray system to continuously dissipate heat, control the speed downhill at a constant speed, prevent coasting in neutral and long-term braking, protect the braking system from the source, and avoid high temperature damage and safety accidents.
Standardize climbing operations to reduce engine and transmission system impact. Starting from steep slopes with heavy loads and forcibly climbing in high gears can cause engine stalling, low RPM, and insufficient combustion, significantly exacerbating carbon buildup. At the same time, the transmission shaft, clutch, and gearbox are subjected to excessive torque impact, which can easily cause clutch plate slippage, increased transmission clearance, and gearbox wear. When climbing in mountainous areas, it is necessary to downshift in advance, maintain a reasonable power speed, climb steadily and uniformly, avoid sudden acceleration and hard dragging of gears, reduce the instantaneous load on the power system, and reduce the speed of wear and tear on precision components.
Targeted strengthening of chassis and suspension protection. The mountainous road surface is bumpy and the impact force of the slope is high, causing the vehicle's center of gravity to shift significantly up and down the slope. The steel plate spring, balance shaft rubber sleeve, and shock absorber are subjected to alternating impact loads for a long time, which easily leads to problems such as rubber sleeve cracking, chassis loosening, suspension abnormal noise, and vehicle body shaking. Daily maintenance requires shortening the lubrication cycle of the chassis, regularly adding butter, tightening the fixing screws of the suspension, axle, and bracket, timely replacing aging and ineffective buffer rubber sleeves, ensuring balanced chassis buffering, and avoiding chassis loosening and deformation caused by long-term uphill driving.
Focus on strengthening the special maintenance of braking and walking systems. The frequency of braking on steep slopes is extremely high, with brake pads, brake drums, cylinders, and springs experiencing much faster wear and tear than on plain vehicles. The wheels are exposed to high temperatures for a long time, and bearings and lubricants are prone to premature failure. The fleet needs to shorten the inspection cycle of brake accessories, adjust brake clearance in a timely manner, check the return of the cylinder, regularly replace high-temperature resistant lubricating grease, and prevent wheel hub high temperature and bearing dry wear and burn. At the same time, maintain the tire pressure standard to avoid the risk of uneven wear and tire blowouts caused by the offset of the center of gravity on the slope.
Standardize the start stop details of ramps to avoid hidden faults. When parking on steep slopes, it is important not to rely solely on handbrake locking. Instead, it is necessary to use wooden pads to prevent slipping and reduce long-term pressure damage to the handbrake mechanism; A smooth start on a slope is achieved by combining the clutch and throttle to avoid the transmission system impact caused by sudden lifting of the clutch due to vehicle slippage. At the same time, mountainous areas are often foggy and humid, so it is necessary to regularly check the lights, wiring, and brake water vapor to prevent circuit faults and brake slippage caused by humid environments.
In summary, steep slopes in mountainous areas belong to high-intensity wear and tear conditions, and vehicle failures are mostly caused by improper operation and inadequate maintenance resulting in operational damage. Adapting to the exclusive driving habits of ramps, strengthening the special protection of braking, power, and chassis systems, can significantly reduce the safety risks of driving in mountainous areas, reduce component premature aging and repair rates, and stabilize vehicle attendance efficiency, helping overseas fleets achieve safe and low-cost operation.
