What causes the noise when shifting gears in JH6?
3 Answers
JH6 makes a noise when shifting into reverse gear due to gear friction during the shifting process. The reverse gear lacks a synchronizer, making this issue common and generally not requiring repair. Below is an introduction to synchronizer-related information: 1. Function of the synchronizer: The synchronizer is a device inside the transmission that ensures smooth gear engagement when shifting gears while driving. 2. Principle of shifting into reverse gear: The synchronizer makes shifting easier by synchronizing the rotational speeds of the gears. However, the reverse gear is a spur gear and does not have a synchronizer. When shifting into reverse, the reverse gear meshes with two other gears, enabling the vehicle to move backward.
I've encountered the JH6 gear shifting noise issue quite a few times, mainly considering internal transmission problems. For example, severely worn synchronizers can cause gears to not mesh smoothly during shifting, resulting in that clunking sound. Another common cause is excessively worn clutch plates, where the noise becomes more noticeable when the clutch isn't fully depressed. Insufficient or contaminated transmission fluid can also lead to inadequate lubrication and frequent abnormal noises. I must remind you that if the noise is accompanied by vehicle vibration, there might be issues with the drive shaft or bearings, which poses greater risks. During safe driving, never ignore abnormal sounds - immediately reduce speed and pull over for inspection. Regular maintenance with transmission fluid checks and replacement every 50,000 km can effectively prevent this. Warming up the vehicle for a few minutes before long trips can also reduce cold-start noise problems.
I've been driving this JH6 for a few years, and recently there's always a clicking sound when shifting gears. I've been thinking about the reasons. It's probably due to improper clutch operation—sometimes when shifting gears in a hurry without firmly depressing the clutch, the gear collision makes a loud noise. Additionally, I checked and found the transmission fluid level was a bit low, causing friction sounds due to insufficient lubrication. I also noticed the driveshaft joint was loose, and after adjustment, the noise reduced. Driving heavy trucks requires attention to details; gentle operation and avoiding stomping on the accelerator can extend the lifespan of parts. If the abnormal noise worsens and affects driving, it's best to take some time to visit a repair shop for a comprehensive inspection to prevent it from becoming a major issue. Don't skimp on daily maintenance costs—transmission health is too crucial.
