What are the reasons why a jack cannot be lifted?
2 Answers
Rust spots and peeling appear on the inner wall of the hydraulic cylinder of the hydraulic jack, affecting the sealing performance. Below are specific details about jacks: 1. Types: A-frame jacks, which have lower load-bearing capacity due to their structure, are mainly equipped on small vehicles. Diamond-shaped jacks have a more robust support structure compared to A-frame jacks. Screw jacks rely on their own threaded structure for self-locking to support the vehicle. 2. Precautions: Secure the vehicle properly, implement safety warning measures, ensure the base of the jack is firmly fixed, align it with the vehicle's chassis support points, and placing a spare tire under the car for added safety.
I found that there could be several reasons why a jack won't lift, the most common being insufficient hydraulic oil or a leak. Once when I was changing a tire myself, the jack just wouldn't lift no matter what. Upon inspection, I realized the oil reservoir was empty or the sealing ring had aged and cracked, causing all the oil to leak out, leaving the piston stuck and immovable. Overloading is another pitfall—for example, if the jack's maximum load is marked as 2 tons but you put a 2.5-ton vehicle on it, it will shut down to protect itself. Regular maintenance is crucial; remember to add specialized hydraulic oil and lubricate the parts every six months. Otherwise, if left unused for a long time, parts may rust or deform, making repairs even harder. Safety reminder: If the jack won't lift, don't force it—take it to a professional shop for inspection to avoid injury or vehicle damage.
