Learning how to work a car jack is a fundamental skill for any driver. Using a car jack safely means knowing your vehicle’s designated lift points, which are crucial for preventing damage and ensuring stability. This guide will walk you through the entire process, from preparation to lowering your car, ensuring you can handle a flat tire or other maintenance with confidence.
Before you even touch the jack, understanding the basics is key. A car jack is a simple mechanical device that uses leverage or hydraulics to lift your vehicle. The most common types are the scissor jack, which comes with most cars, and the hydraulic floor jack, often used in garages. Each has its own method of operation, but the safety principles remain the same.
How To Work A Car Jack
This section provides a complete, step-by-step breakdown of the jacking process. Follow these instructions carefully to perform the task safely and efficiently.
Step 1: Prepare Your Vehicle And Workspace
Never skip preparation. A safe workspace is the foundation of the entire operation. First, find a level, solid surface like concrete or asphalt. Avoid dirt, grass, or gravel, as the jack can sink or shift. Turn on your hazard lights to alert other drivers, especially if you’re on the side of a road.
Next, secure your vehicle. Apply the parking brake firmly. If you are changing a tire, place wheel chocks or heavy blocks of wood against the tires that will remain on the ground. For a front tire change, chock the rear tires. For a rear tire change, chock the front tires. This prevents the car from rolling.
Gather Your Tools
- The car jack (scissor or hydraulic)
- The vehicle’s owner’s manual
- A lug wrench
- Your spare tire
- Wheel wedges or chocks
- Work gloves for protection
Step 2: Locate The Correct Jacking Points
This is the most critical step for safety. Your car has specific, reinforced points on its frame designed to handle the weight and pressure of the jack. Lifting from any other area, like the plastic body panels, floorboards, or suspension parts, can cause severe damage to your vehicle and lead to a collapse.
Consult your owner’s manual. It will have diagrams showing the exact locations of the front and rear jack points. Typically, they are small notches or reinforced sections of metal along the sides of the car, just behind the front wheels and just ahead of the rear wheels. Some vehicles have a central jack point for use with a floor jack.
Step 3: Position And Engage The Jack
Now, position the jack correctly. For a scissor jack, the top plate or groove must align perfectly with the vehicle’s jack point. For a hydraulic floor jack, the saddle (the flat lifting pad) should be centered under the jack point. Ensure the jack is sitting flat on the ground and is not at an angle.
Begin lifting slowly. For a scissor jack, insert the handle and turn it clockwise. You will feel resistance as it starts to take the vehicle’s weight. For a hydraulic floor jack, place the handle into the socket and pump it up and down in a smooth, steady motion. The car will begin to rise.
Important Lifting Tips
- Lift smoothly and steadily, without jerky motions.
- Stop frequently to check the jack’s position; it should remain vertical.
- Do not lift the vehicle higher than absolutely necessary to remove the flat tire or perform your task.
- Never put any part of your body under a vehicle supported only by a jack.
Step 4: Secure The Vehicle With Jack Stands
If you are performing any repair beyond a quick tire change, you must use jack stands. A jack is a lifting tool, not a long-term support device. Hydraulic seals can fail, and mechanical jacks can slip. Jack stands are designed to lock securely in place.
Once the car is lifted to a suitable height, place a jack stand under a secure, load-bearing part of the frame, like a designated stand point or a solid axle. Lower the jack slightly so the vehicle’s weight transfers onto the stand. Ensure the locking pin is fully engaged. For added safety, use two jack stands if you will be under the car. You can then slowly release the jack completely, leaving the vehicle securely on the stands.
Step 5: Lowering The Vehicle Safely
After your work is complete, reversing the process is just as important. If you used jack stands, carefully raise the vehicle with the jack just enough to remove the stands. Clear all tools and the spare tire from underneath the car.
To lower, go very slowly. For a scissor jack, turn the handle counter-clockwise with controlled, small movements. For a hydraulic jack, there is usually a release valve. Turn the valve slowly to allow the car to descend gradually. Do not release the valve quickly, as the car will drop suddenly. Once the tire is firmly on the ground, you can finish removing the jack from under the vehicle.
Common Types Of Car Jacks And Their Use
Knowing how to operate different jacks improves your versatility. Here’s a look at the three most common types.
Scissor Jacks
This is the compact jack included with most vehicles. It operates with a screw mechanism turned by a provided handle. They are lightweight and store easily but have a lower weight capacity and can be unstable on uneven surfaces. They are best for emergency tire changes on level ground.
Hydraulic Floor Jacks
Common in home garages, these jacks use hydraulic fluid and a pump handle to lift. They have a wide base for stability, roll on wheels for easy positioning, and can lift much higher and with less effort than a scissor jack. They are ideal for maintenance and repairs but are bulky to transport.
Bottle Jacks
Bottle jacks are hydraulic but have a vertical, bottle-like shape. They have a high weight capacity and a small footprint, making them good for trucks and SUVs. However, they can be less stable due to their narrow base and often have a shorter lifting range. Always ensure they are on a perfectly level surface.
Critical Safety Precautions To Always Follow
Ignoring safety turns a simple task into a dangerous one. These rules are non-negotiable.
- Never work under a car supported only by a jack. Always use jack stands.
- Always use the parking brake and wheel chocks to prevent rolling.
- Lift only on level, solid pavement. Never jack a car on a slope, dirt, or gravel.
- Do not exceed your jack’s rated weight capacity, which should be higher than your vehicle’s gross weight.
- Keep children and pets away from the work area at all times.
- Inspect your jack and stands before each use for cracks, leaks, or damage.
Troubleshooting Common Jack Problems
Sometimes, things don’t go as planned. Here’s how to handle common issues.
The Jack Won’t Lift The Car
First, check that you are turning the handle or pumping in the correct direction. Ensure the jack’s release valve (on hydraulic models) is fully closed. Verify that the jack is properly positioned under the jack point and is sitting flat. The vehicle may be too heavy for the jack; check its weight capacity.
The Car Seems Unstable On The Jack
Stop immediately. Lower the car carefully and reposition the jack. The most likely cause is incorrect placement on a weak part of the car body or on an uneven surface. Double-check the jack point in your manual. Ensure the jack’s base is fully in contact with the ground.
The Jack Won’t Lower Smoothly
On a scissor jack, the screw mechanism might be dirty or corroded. Try applying a small amount of lubricant. On a hydraulic jack, the release valve might be dirty. Open and close it a few times. Never force it. If it still won’t lower properly, the jack may need servicing or replacement.
FAQs About Using A Car Jack
Where are the jack points on my car?
The exact locations are in your vehicle’s owner’s manual. Typically, they are reinforced metal sections along the side sill, just behind the front wheels and just ahead of the rear wheels. Some cars also have a central front or rear point.
Can I use any jack on any car?
No. You must use a jack with a weight capacity that exceeds your vehicle’s gross weight. Using a small scissor jack meant for a compact car on a large truck is extremely dangerous and will likely fail.
How do I use a scissor jack?
Insert the handle into the socket and turn it clockwise to lift. Ensure the top of the jack is seated in the vehicle’s jack point. Turn the handle counter-clockwise to lower. Always lift on a level surface.
Is it safe to change a tire on the side of the road?
It can be done safely with caution. Pull as far off the road as possible, onto a firm, flat area. Turn on your hazard lights. Use wheel chocks. Be hyper-aware of passing traffic and work as quickly and carefully as possible. If you are on a busy highway or unsafe shoulder, it may be safer to call for roadside assistance.
What maintenance does a car jack need?
Keep it clean and store it in a dry place to prevent rust. For hydraulic jacks, check for fluid leaks and ensure the release valve operates smoothly. Periodically check all jacks and stands for cracks, bends, or other damage. A damaged jack should be replaced immediately.
Mastering how to work a car jack empowers you to handle roadside emergencies and perform basic maintenance. The key takeaways are always prepare your workspace, locate the proper jack points, lift slowly and steadily, and never trust a jack alone to support the vehicle. With this knowledge and consistent practice of safety, you can approach this task with the confidence and care it requires. Remember, taking an extra minute to be safe is always worth it.