How to Open a Car Jack?
2 Answers
There are two common types of car jacks: rack-type jacks and screw-type jacks. The method to open a scissor jack is to rotate the threaded rack with a lever to tighten the lifting arms and raise the jack, lifting the vehicle off the ground. This structure has a relatively small load-bearing capacity. Below is an introduction to the jacks: 1. Diamond-shaped jack: Similarly, it lifts the vehicle by tightening the support arms with a rack. Most private cars are equipped with diamond-shaped rack jacks, whose support structure is more reliable and sturdy than scissor jacks. The structure of diamond-shaped rack jacks is the same for small cars to SUVs, with only differences in size and materials. 2. Screw jack: Insert the wheel bolt wrench into the jack's bolt hole and then turn it to lift the jack. The screw jack relies on its own threaded structure for self-locking, providing support force to hold the vehicle, with a much higher load-bearing capacity than rack jacks. The downside is that this type of jack lifts slowly but descends quickly, so safety precautions must be taken during use.
I remember the first time changing a tire, using the car jack was quite straightforward. First, find a flat spot to park, engage the handbrake, and use wheel chocks to prevent rolling. The jack is usually in the spare tire compartment—take it out and locate the vehicle's designated lifting points marked with symbols on the steel frame underneath. Position the jack base correctly, ensuring it's stable. Then, insert the handle pin and turn clockwise slowly. If it's a scissor jack, it will gradually rise; for a hydraulic one, you might need to pump a few times. Never stand under the vehicle—maintain a safe distance throughout. Lift just enough to swap the tire, then lower it counterclockwise afterward. I recommend practicing beforehand so you're not flustered during a flat. Keep gloves and a towel handy to wipe your hands, and work steadily without rushing. Remember, improper placement can scratch the undercarriage or cause tipping—double-checking is key.
