Reasons For Frequent Abnormal Noises From Truck Balance Axles And Daily Prevention Methods

The balance axle of a heavy-duty truck is the core load-bearing component of the chassis suspension, mainly responsible for buffering the vehicle body, balancing left and right forces, and sharing heavy load impacts. It is widely suitable for complex working conditions such as long-distance trunk lines, steep slopes in mountainous areas, and heavy loads on construction sites. Many overseas fleets often encounter problems such as dull and abnormal noises from the bottom of the chassis and rattling noises on bumpy roads during daily driving. Most drivers simply diagnose it as loose steel plates and ignore the hidden dangers of balance shaft faults. The abnormal noise of the balance shaft belongs to a progressive chassis disease, which is initially only a slight noise. If left untreated for a long time, it can cause suspension imbalance, body shaking, steel plate fracture, tire running deviation and other problems, greatly increasing operation and maintenance costs and seriously affecting driving safety. Mastering the common core causes and daily prevention techniques of abnormal noises in the balance shaft can effectively extend the service life of the chassis suspension and ensure stable operation of the vehicle. The aging and wear of the balance shaft rubber sleeve is the main cause of abnormal noise. Long term bumps, vibrations, heavy loads, and pressure on vehicles can cause continuous compression and friction of the rubber sleeve inside the balance shaft, resulting in problems such as dry cracking, hardening, looseness, and delamination. As a buffering component, the rubber sleeve will directly make hard contact with the metal parts after wear and failure. When driving over potholes and gravel roads, it will produce obvious impact noise. The dusty and rainy working conditions overseas will accelerate the aging of the rubber sleeve, and the invasion of sediment and rainwater corrosion will further expand the fit gap, making the problem of abnormal noise more serious. It is a high-frequency fault of construction sites and mountainous operation trucks. Lack of lubrication and inadequate maintenance are key causes of frequent abnormal noises. Most truck balance axles are equipped with dedicated grease fittings and require regular lubrication and maintenance. Many fleets have neglected the maintenance of the balance shaft for a long time, causing butter to dry up and impurities to accumulate, resulting in dry wear and tear of the balance shaft shaft and lining. This not only produces persistent friction noise, but also causes lining strain and shaft wear, resulting in irreversible mechanical damage. Compared to other chassis components, the maintenance of the balance shaft is easily overlooked, and long-term lack of oil is the main reason for later major repairs. Loose installation and excessive clearance between accessories can cause persistent abnormal noise. The transportation of vehicles from the factory and long-term heavy load bumps can easily cause the fixing screws and bracket bolts of the balance shaft to loosen, resulting in an increase in overall assembly clearance. During vehicle operation, the chassis is subjected to force displacement, and loose parts repeatedly collide and shake, resulting in regular abnormal noise. At the same time, excessive wear of the balance shaft bushing and excessive clearance between accessories can also lead to obvious noise under no-load conditions and aggravated noise under heavy load. If not tightened and repaired in a timely manner, it will exacerbate the fatigue of the chassis structure. Poor driving and overloading conditions can accelerate the growth of faults.Long term overloading, uneven loading, high-speed potholes, and sudden braking on steep slopes can cause the balance shaft to bear overload impacts, far exceeding the designed load-bearing range of the components, resulting in rapid damage to the rubber sleeve, deformation of the shaft body, loosening of screws, and premature induction of abnormal noise faults. Frequent and harsh working conditions can significantly shorten the maintenance cycle and service life of the balance axle suspension system. Daily standardized prevention is the core of eliminating abnormal noise from the balance shaft, which does not require complex maintenance and can be effectively avoided through regular maintenance. Firstly, it is necessary to regularly add high-temperature resistant lubricating grease, clean impurities from the grease fitting, and ensure sufficient lubrication of the shaft liner; Secondly, regularly check the fixing bolts of the balance shaft, tighten the loose points in a timely manner, replace the aging and damaged rubber sleeves and worn bushings; Finally, standardize driving habits, eliminate overloading and uneven loading, pass through bumpy and bumpy roads at low speeds, and reduce hard impact on the chassis. For overseas truck fleets, the focus is on prevention rather than maintenance of abnormal noise from the balance shaft. Implementing regular chassis maintenance and avoiding bad driving habits can completely solve the problem of abnormal noise in the balance axle, stabilize the chassis suspension working conditions, reduce chassis maintenance costs, and effectively improve the durability of heavy-duty trucks and the stability of long-distance and complex construction site working conditions.