In the process of cross-border transportation of heavy trucks and heavy loading operations on construction sites, high temperature overheating of wheel hubs is a high-frequency and frequent fault, and it is also a safety hazard that is easily overlooked by drivers. Many fleets only conduct maintenance when the wheels are smoking or overheating, ignoring the hidden problem of slight overheating. Long term high-temperature operation of wheel hubs can directly lead to grease failure, accelerated bearing wear, brake thermal attenuation, and in severe cases, cause major safety accidents such as tire fires, high-speed tire blowouts, and wheel hub cracking. Mastering the rapid troubleshooting methods for high temperature wheel hubs and implementing daily protective maintenance are key to reducing the risk of malfunctions, minimizing operation and maintenance costs, and ensuring stable attendance for overseas fleets.
Brake drag is the primary cause of wheel hub overheating, accounting for over 80% of high-temperature wheel hub failures. In daily driving, poor brake cylinder return, small brake shoe clearance, brake pin shaft jamming, and accumulated water in the air reservoir can all cause the brake pads to lightly adhere to the brake drum for a long time, resulting in continuous friction and heat generation during driving. This type of fault does not have obvious braking abnormalities in the initial stage, but only manifests as slight overheating of the wheel hub, slight fuel consumption of the vehicle, and increased driving resistance. If left untreated for a long time, it can cause thermal fatigue of the brake components, resulting in brake failure, overheating and deformation of the wheel hub. The risk increases exponentially under long downhill conditions in mountainous areas.
Improper calibration and maintenance of wheel hub bearings are the core mechanical causes of high-temperature faults. Unreasonable adjustment of bearing clearance and non-standard filling of lubricating grease can directly cause high temperature problems. The bearings are tightened too tightly, causing continuous compression and friction of metal components during operation, resulting in rapid high temperatures; If the gap is too loose, it will cause the wheels to shake, produce uneven wear and abnormal noise, reduce the stability of operation, and continuously accumulate frictional heat. At the same time, the deterioration, water ingress, and lack of oil of the lubricating grease will completely lose the lubrication and cooling effect, causing the bearings to dry and run. In a short period of time, the wheel hub can rapidly heat up, and in severe cases, it can cause the bearings to lock up and be scrapped.
Poor driving habits and heavy load conditions can exacerbate the problem of wheel hub overheating. Overseas transportation commonly involves heavy, unbalanced, and overloaded operations. Exceeding the vehicle load limit can cause the wheel hub bearings and braking system to work under long-term overload, resulting in a significant increase in heat dissipation pressure. In addition, frequent braking on long downhill slopes in mountainous areas, long-term sliding with brakes, and high-speed bumpy driving can all lead to the inability to dissipate brake heat in a timely manner and continue to accumulate inside the wheel hub. Compared to smooth and uniform driving, harsh working conditions and non-standard operations can increase the incidence of high-temperature wheel hub failures by several times, leading to premature aging of acceleration walking system components.
Abnormal chassis assembly and accessories are hidden causes that are easily overlooked. Uneven tightness of wheel hub screws and misalignment of wheel rims can cause slight shaking during wheel operation, resulting in sustained frictional heating; Abnormal tire pressure and uneven tire wear can change the driving resistance of the wheels and increase the load on the wheel hub; Vehicle axle offset and uneven suspension force can cause excessive load on one side of the wheel, resulting in overheating of the wheel hub on one side. This type of problem has strong concealment and no obvious abnormal noise, and can only be discovered through daily investigation.
Simple and efficient daily protective techniques can prevent wheel hub high temperature faults from the source. Before and after daily driving, it is necessary to touch and check the wheel hub temperature to detect and handle it early; Regularly adjust the brake clearance, clean the impurities in the brake system, drain the accumulated water in the air reservoir, and ensure that the brake fully returns to its original position; Replace high-temperature resistant lubricating grease according to the working cycle, accurately adjust the bearing clearance, and prevent dry grinding operation; Eliminate overloading and uneven loading during driving, prioritize using water spray cooling and auxiliary braking on long downhill slopes, and reduce frequent foot pedal braking; Regularly tighten the wheel hub screws, calibrate tire pressure and chassis data to ensure smooth operation of the wheels.
For overseas heavy-duty truck fleets, high wheel hub temperature is a typical progressive working condition fault, and early troubleshooting and maintenance costs are extremely low. Ignoring it can lead to major safety accidents and high maintenance costs. Implementing regular inspections, standardized maintenance, and standardized operations can effectively eliminate high-temperature hazards in wheel hubs, extend the service life of bearings, brakes, and wheel hub assemblies, and comprehensively improve the driving safety and attendance efficiency of vehicles under complex working conditions.
