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What is the reason why the differential lock cannot be turned off?

2 Answers

ReedLee

07/28/25 10:36pm

It may be due to air leakage in the differential lock's air tube. Here are the relevant explanations: 1. Differential: A conventional differential allows the left and right wheels to rotate at different speeds, but when one wheel spins freely, the other wheel on good road surface also fails to receive torque, causing the vehicle to lose driving power. In this situation, the differential does not function. By locking the two wheels together, power can at least be transmitted to the other wheel, enabling the vehicle to regain driving power and escape the predicament. 2. Working principle of the inter-wheel differential: When the vehicle is moving straight, the driven bevel gear of the main reducer drives the differential case to rotate. The differential then drives the planetary gear shaft to rotate, which in turn drives the planetary gears to revolve. The side gears, held by the planetary gears, rotate at the same speed and direction. At this point, the planetary gears only revolve without rotating on their own, and the speed of the left and right wheels equals the speed of the driven bevel gear.

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Marian

08/12/25 3:06am

I've encountered the situation where the differential lock won't disengage several times, especially after off-roading when the wheels are packed with mud. Mud and sand can get inside and jam the mechanical locking mechanism, preventing it from moving. Insufficient lubrication can also cause the spring not to return or internal components to rust, wear, or break, which is another common reason. Additionally, if the weather is cold and the oil viscosity increases, the locking device may move sluggishly. Debris or foreign objects inside the differential can also cause jamming. If not addressed promptly, this situation can lead to increased wear in the drivetrain, louder noises, or even loss of vehicle control during turns. It's recommended to thoroughly clean the chassis after each off-road trip and regularly check the differential lock's lubrication. If necessary, use a specialized cleaner to flush it out. If it gets stuck, don't force it—safety first. Seek professional repair to avoid greater damage.

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