So-called "disengagement" refers to the situation where, during the travel of a special-purpose vehicle, the gearshift lever automatically returns to the neutral position, causing the sliding gear to leave its normal meshing position. So-called "wrong shifting" refers to the situation where the gearshift lever fails to engage the required gear, or after shifting, does not enter the required gear but instead enters another one, making the vehicle uncontrollable and even leading to accidents. Disordered shifting and disengagement in the transmission are common faults, with some connection between them, both caused by wear, looseness, or damage to components related to the transmission, or improper adjustment of mating clearances.
Cause Analysis:
1. Wear, looseness, breakage, or loss of the positioning pin on the gearshift lever, causing it to lose control and swing randomly.
2. Erosion and failure of the interlock device on the shift fork shaft; excessive wear and looseness of the gearshift ball head.
3. Gears, gear rings, or gear sleeves worn into a conical shape along the tooth length direction, disengaging due to axial forces generated during operation.
4. Excessive erosion of the shift fork shaft slot, lock pin, etc., bent or deformed shift forks, or excessive clearance between working surfaces and gear ring slots.
5. Loosening of the fixing nut at the rear end of the second shaft, causing axial movement of the second shaft.
6. Loose or disassembled lock pins on the synchronizer, ineffective cone surface operation.
When a certain gear disengages, push the gearshift lever back into that gear, then remove the transmission cover and observe the gear meshing condition. If the gears mesh well, the problem lies in the shifting mechanism. Test the positioning device of the jumping gear's shift fork by hand. If the positioning is poor, remove the shift fork shaft and test the positioning ball and spring. If the gears are not fully meshed, manually push the disengaged gear or sleeve to check if they can mesh accurately. Inspect whether the shift fork is bent or worn loose, whether the securing screws of the shift fork are loose, and whether the gap between the fork end and gear slot is too large. If the shifting is good and the gear or sleeve can fully mesh, inspect whether the gear is worn into a cone shape, whether the bearing is loose, and whether the transmission shaft moves front and back. Based on the issues found during the above checks, restore according to the standard, replace parts if necessary, to completely eliminate the fault of disordered shifting and disengagement in the transmission.
When maintaining your car, you might encounter some misconceptions. When browsing online, try to gather more information about this aspect, remember the dos and don'ts during maintenance, and avoid taking detours. To keep your car healthy and retain its value, here are four things you should not do when maintaining your car:
1. Do not wash the inside of the body with water.
Many private car owners choose to wash their cars themselves during holidays, rinsing the body with water while wiping it with a cloth. It is important to note that the inside of the body should not be directly washed with water. If the floor mat is dirty, use a vacuum cleaner or take it out and clean it with a brush and cleaning agent, then dry it before putting it back in. The recessed grooves under the floor mats in the driver's cabin have many holes. Once water gets in, it won't dry itself and may flow onto the transmission and other components, causing rust. The correct approach is to clean with a vacuum cleaner and then wipe with a cloth to avoid water accumulation.
2. Do not mix different brands of coolant.
When your car's coolant is low, would you urgently pour in a different brand of coolant? If so, it is recommended to drain the coolant as soon as possible and refill with the same brand. Different brands of coolant may have significantly different chemical properties, and the corrosion inhibitors of one may corrode others. Mixing different brands of coolant, which use different corrosion inhibitors, can cause unnecessary trouble.
3. Do not apply oil to tire bolts and nuts.
For bicycles, we often apply oil to the bolts when they rust, allowing them to function normally again. But what about cars? Some car owners coat the bolts and nuts with oil to prevent rust, unaware that this practice is not only incorrect but also poses a certain safety hazard. At high speeds, the bolts and nuts can easily loosen or even fall off, leading to traffic accidents. Bolts and nuts have a self-locking feature when tightened. Such a counterproductive measure should be avoided at all costs.
4. Do not press the gas pedal when starting an electronic fuel injection car.
The engine of an electronically fuel-injected car differs from that of a regular car. Its fuel injection control device can automatically adjust the fuel supply based on the engine temperature and operating conditions, enabling smooth engine startup. In cold weather, most car owners tend to press the gas pedal a few times before starting the engine, but this method is not suitable for electronically fuel-injected cars. Cars equipped with electronic fuel injection systems can automatically increase the fuel supply. Following the method for regular cars can lead to poor engine start-up.
The above content is jointly released by the Sanitation Garbage Truck Official Website (http://www.clwlu.com/) and Garbage Truck Manufacturer (http://www.clwwcw.com/). For more exciting content: Dongfeng Sprinkler Truck Prices, Preventing Air, Moisture, and Dust from Entering Internal Parts in Rust-Prone Areas, High-altitude Work Vehicle Prices, Common Fault Inspection and Elimination of Dongfeng Dump Truck Operation Systems.