Heavy Truck Shaking During Operation, Quickly Locate The Fault Location

The shaking of heavy trucks during operation is the most common and easily overlooked fault phenomenon in fleet operations. Whether driving at high speeds, climbing under heavy loads, or idling at a constant speed, shaking of the vehicle body, shaking of the front of the car, or tingling of the steering wheel all indicate hidden faults in the vehicle. Long term driving with illness not only reduces the driving experience, but also accelerates the aging of tires, chassis, braking, and steering systems, leading to higher maintenance costs and safety hazards. Mastering the fast judgment method for jitter faults, accurately locating the problem location, can help overseas fleets efficiently troubleshoot faults, reduce blind repairs, and improve vehicle attendance.
Vehicle speed corresponds to shaking, which can quickly distinguish the fault area. Low speed driving and noticeable starting vibrations are mostly caused by the transmission system. Common causes include wear of the clutch pressure plate, jamming of the release bearing, looseness of the transmission shaft cross joint, and wear of the suspension bracket bearing. These problems can lead to uneven power transmission, causing jerking and shaking of the vehicle body during start-up, especially at low speeds. If there is only steering wheel shaking and high-frequency vibration of the front of the car in a specific speed range, it is mostly due to front wheel walking system faults, concentrated in tire deformation, front wheel imbalance, wheel rim roundness, bearing looseness and other problems.
After the road surface is bumpy, the shaking intensifies. Focus on checking the chassis suspension system. Long term cross-border bumps on heavy trucks and gravel road conditions on construction sites can easily lead to the failure of shock absorbers, aging of steel plate rubber sleeves, increased clearance between thrust rods, and loosening of chassis screws. After the chassis buffering capacity decreases, road vibrations cannot be filtered out, and the entire vehicle continues to shake, especially during potholes and turns. If this type of malfunction is not dealt with in a timely manner, it can quickly cause chain problems such as tire sawtooth wear, chassis noise, and driving deviation.
Shaking occurs during braking, and the problem is concentrated in the braking system. The vehicle runs smoothly and normally, but when the brake is applied, the steering wheel bounces and the body vibrates, mainly due to the brake drum being out of roundness, uneven wear of the brake pads, and inconsistent brake shoe clearance. Frequent braking on long downhill slopes in mountainous areas and deformation of the brake drum due to high temperature and thermal degradation are the main causes of brake shaking. It is necessary to timely bore the drum or replace the friction pair to avoid safety risks caused by unstable braking.
Idle body shaking, mainly investigate the engine and engine foot working conditions. The continuous shaking of the vehicle at idle speed is reduced after driving, mainly due to aging of the engine foot rubber, excessive carbon deposits in the engine, and poor fuel atomization, resulting in uneven power output. Minor carbon deposits can be maintained and cleaned, but if the machine feet are aging, they need to be replaced in a timely manner to avoid long-term vibration damage to the precision components of the entire vehicle.
Overall, heavy truck shaking does not require blind disassembly and maintenance, and the fault location can be quickly locked based on vehicle speed, road conditions, and operating status. Shake the transmission at low speeds, shake the front wheels at specific speeds, shake the chassis on bumpy roads, shake the brakes, and shake the engine mounts at idle speeds. Targeted troubleshooting and precise maintenance can effectively solve the problem of vehicle body shaking, extend the service life of the chassis, help overseas fleets reduce operation and maintenance costs, and ensure stable and safe vehicle operation.