What are the reasons for a broken differential?

[SanChase]

The main reasons for a broken differential are as follows: 1. Improper operation by the driver: Incorrect operation of the differential lock by the driver, failure to disengage the differential lock in time when the vehicle exits a rough road surface, leading to damage. 2. Oil level below normal: The oil level is below the normal value, the driver fails to observe the oil level in time, and the oil level line is too low, resulting in poor lubrication and causing damage to the differential. 3. Improper bearing clearance during assembly: Excessive bearing clearance during assembly causes axis deflection, while insufficient clearance can lead to phenomena such as surface burning, pitting, and surface layer peeling of the rollers.

[Ida]

My differential broke down not long ago, making obvious metal grinding noises when turning. The mechanic later said the oil had completely leaked out, causing gear wear. Common causes include aging seals leading to oil leaks and insufficient lubrication causing part friction damage; also, frequently driving on muddy roads allows dirt or moisture to enter the oil, rusting the internals; and poor driving habits like slamming the accelerator or sharp turns, which put uneven pressure on the differential, leading to fatigue cracks over time. I now realize I was too careless with maintenance—forgetting to change the oil, which should be done every 50,000 km. The 3,000 yuan repair was really not worth it. Now, I regularly check the oil level and drive more smoothly.

[LeLiam]

Differential failures mainly stem from lubrication issues, such as oil leakage or contaminated oil causing dry friction and wear on bearings. Gear breakage is also common, especially when vehicles are overloaded for extended periods or during long-distance towing, where excessive heat accelerates aging. External impacts like hitting potholes or accidents can deform the housing. Internal locking mechanisms getting stuck can disrupt power distribution. It's recommended to regularly check oil conditions and maintain cleanliness, changing the oil every 50,000 kilometers to prevent minor issues from escalating into major repairs, ensuring smooth and worry-free driving.

[JessicaMarie]

Off-roading often causes differentials to engage abruptly, with significant impact when wheels leave and hit the ground, leading to common gear fractures. Water intrusion after wading can rust components by contaminating the oil. High-speed racing or drifting overheats and oxidizes the oil. Improperly modified oversized tires increase load, potentially crushing internal parts. Long-unchanged oil accumulates sludge, clogging the lubrication system. I always remind fellow car enthusiasts that maintaining oil is crucial, and avoiding extreme driving can significantly extend lifespan.