How to Use a Car Jack Safely

What is a Car Jack and Why Use One?

A car jack is a mechanical device used to lift a vehicle partially off the ground, allowing access to the underside for tasks like changing a tire, inspecting brakes, or performing oil changes. There are several types, including scissor jacks (often included with your car), floor jacks (hydraulic trolley jacks), bottle jacks, and hi-lift jacks. Each has specific use cases and safety considerations. The primary purpose of a jack is to raise the vehicle; it is not designed to support it for extended periods or while you work underneath it.

How to Use a Car Jack Safely: Step-by-Step Guide

Following a systematic process minimizes risk. Here is the correct procedure for using a standard floor jack or scissor jack.

Step 1: Preparation and Safety Checks

Before you even touch the jack, ensure your environment is safe. Park the vehicle on a firm, level, and dry surface. Avoid gravel, grass, or asphalt, which can sink or shift under load. Engage the parking brake firmly and put the transmission in Park (or first gear for manual transmissions). Place wheel chocks on the opposite end of the vehicle from where you will be lifting. For example, if lifting the front, chock both rear wheels.

Step 2: Locate the Correct Jacking Points

Consult your vehicle owner's manual to find the designated jacking points. These are reinforced areas of the chassis or frame designed to bear the vehicle's weight. Common locations include pinch welds behind the front wheels or in front of the rear wheels, and reinforced points on the frame or subframe. Never place a jack under the floor pan, suspension components, axles, or oil pan, as this can cause severe damage and collapse.

Step 3: Position the Jack

Place the jack directly under the designated jacking point. Ensure the jack's saddle (the lifting pad) is centered and makes full contact with the vehicle's lift point. For floor jacks, the wheels should be on solid ground and the jack should be positioned so it rolls freely as it lifts. For scissor jacks, ensure the base is flat and stable.

Step 4: Lift the Vehicle

Pump the jack handle slowly and smoothly. Watch the vehicle as it rises to ensure it remains stable and the jack does not shift. Lift the vehicle only high enough to perform your task. For a tire change, lift until the tire clears the ground by about one inch. Never position any part of your body under the vehicle while it is supported only by a jack.

Step 5: Immediately Use Jack Stands

This is the most critical safety step. Once the vehicle is lifted, slide a pair of jack stands under the vehicle's designated support points (usually the frame or pinch welds, near the jacking points). Adjust the stands to the same height and ensure they are locked into position. Lower the vehicle slowly onto the jack stands so they bear the full weight. The jack can then be removed or left in place as a secondary backup. Never work under a vehicle supported only by a jack.

Step 6: Lower the Vehicle

To lower the vehicle, reverse the process. Use the jack to lift the vehicle slightly off the jack stands. Remove the jack stands. Then, slowly release the jack's hydraulic valve (usually by turning the handle counterclockwise) to lower the vehicle gently to the ground. Remove the wheel chocks last.

Types of Car Jacks and Their Safety Features

Understanding the different jack types helps you choose the right tool for the job and use it correctly.

Floor Jacks (Trolley Jacks)

These are the most common for home garages. They are stable, easy to maneuver, and lift quickly. Look for models with a wide base, a large saddle, and a bypass valve that prevents over-lifting. The Arcan 2-Ton Steel Floor Jack is a top choice for its low profile and robust construction.

Scissor Jacks

Typically included with vehicles for emergency tire changes. They are compact but less stable and require more effort. Always ensure the base is on solid ground and the lifting point is correctly aligned. They are not suitable for frequent use or heavy vehicles.

Bottle Jacks

Hydraulic jacks with a vertical ram. They are very strong for their size but can be unstable on uneven surfaces. They require a solid, flat base and are best used on trucks or SUVs with high ground clearance. Always use with jack stands.

Hi-Lift Jacks

Designed for off-road recovery and lifting heavy equipment. They are dangerous for standard car maintenance due to their instability. Only use them on vehicles with reinforced bumpers or designated lift points, and never use them without jack stands.

What to Check Before Buying a Car Jack

Choosing the right jack is essential for safety and usability. Consider these factors before making a purchase.

• Weight Capacity: Always choose a jack with a capacity greater than your vehicle's gross weight. A 2-ton jack is sufficient for most sedans and crossovers. For trucks or SUVs, a 3-ton or higher capacity is recommended.
• Minimum and Maximum Height: The minimum height must be low enough to slide under your vehicle's lift point. The maximum height must be high enough to lift the tire off the ground. Low-profile jacks are available for sports cars.
• Build Quality: Look for a steel or aluminum frame with a wide, stable base. Check the saddle size and material. A rubber saddle pad helps prevent slipping.
• Hydraulic System: A dual-pump design lifts faster. A bypass valve prevents the ram from extending too far, which protects the jack from damage.
• Warranty and Brand: Reputable brands like Arcan, Torin, and Pro-Lift offer better reliability and customer support. Check the warranty period.

Common Mistakes to Avoid

Even experienced DIYers can make errors. Avoid these common mistakes to stay safe.

• Using a jack on soft ground: Always use a hard, level surface. Soft ground can cause the jack to sink or tip.
• Not chocking the wheels: The vehicle can roll off the jack if the parking brake fails or is not engaged. Always chock the opposite wheels.
• Placing the jack in the wrong spot: Lifting by the oil pan, suspension, or floor pan can cause catastrophic damage and collapse.
• Working under a vehicle supported only by a jack: A jack can fail suddenly. Always use jack stands as the primary support.
• Overloading the jack: Exceeding the rated capacity can cause the jack to fail. Know your vehicle's weight.
• Using a damaged jack: Check for leaks, cracks, or bent components before each use. Do not use a faulty jack.

How to Maintain Your Car Jack

Regular maintenance extends the life of your jack and ensures it operates safely. Keep the jack clean and dry. Check the hydraulic fluid level periodically and top it up with the recommended fluid (usually jack oil, not brake fluid). Lubricate the pivot points and wheels with light oil. Store the jack in a dry place to prevent rust. Inspect the saddle and base for damage before each use. If the jack leaks or fails to hold pressure, replace it immediately.