Engine maintenance I believe everyone knows that the effect of vehicle performance and driving quality after oil change is immediate, so many users also pay attention to regular maintenance. However, like the maintenance of the gearbox and rear axle, some users despise it a bit. For heavy truck gearboxes, even if it is a long oil change, the manufacturer generally recommends that the oil change interval is only 100,000 kilometers. However, many users will think that this oil change cycle is conservative, and it is not an exaggeration to change it every 200,000 kilometers. Some old drivers will tell you from past experience that it is no problem for the gearbox to dry up to 500,000 kilometers without changing the oil, or even until the vehicle is scrapped.
Some gearboxes do not change the oil for 300,000 to 400,000 kilometers, and it is not easy to feel it when driving, but is there really no problem inside the gearbox? In order to save maintenance costs, is the practice of repairing instead of maintenance worth encouraging? Earlier, a user's Dongfeng Tianlong ZF gearbox did not change the oil for a long time, and the 4th gear of the countershaft was damaged, and the overhaul cost more than 3,000. Some card friends commented that there are two reasons for broken teeth, one is the lack of gear hardness, and the other is improper operation. Gear oil is important but not the main reason.
Although the point of view is reasonable, it should also be premised on proper maintenance. The function of gear oil is to lubricate and cool. If the gearbox is not changed for 500,000 kilometers, even if the gears have not been damaged, the internal parts, including shafts and gears, have been affected in terms of strength, which is worse than normal maintenance. faster. In the overhaul, a gear is replaced due to damage, and other internal parts appear to be intact, but in fact, the potential risk of damage is not exposed.
If a single gear of this kind of gearbox is damaged, it is not a big problem, and the maintenance price is not too high. Taking Jiefang's 12-speed gearbox as an example, the repair price quoted by a 4S shop service station in Guangzhou is about 4,000 when the parts are processed.
Therefore, some people think that if only one tooth is damaged without changing the oil for 500,000 kilometers, the overhaul is lower than the maintenance price during this period, and it is also worth it. Is this really the case?
Don't forget to mention above that even if only one tooth is broken at present, the strength of other parts will be reduced due to the lack of lubrication and cooling for a long time. The worst situation that may happen in the future is that other gears and even shafts are damaged. . If the car breaks down on the road, it is worth the loss of time and time. Knowing how to maintain it properly can greatly reduce the occurrence of this situation.