How to Use Scissor Jack: Clear Instructions and Common Mistakes
How to use scissor jack? Many drivers assume a scissor jack is meant to hold a vehicle in the air while a tire is changed. It is not. A factory scissor jack is mainly a temporary lifting tool, and its safe use depends as much on where and how it is placed as on turning the handle.
I also see confusion about the order of operations Lug nuts should be loosened before the tire leaves the ground the vehicle should be lifted only high enough.
Below, I explain the equipment, preparation, lifting process, lowering procedure, common mistakes, and situations in which a scissor jack is the wrong tool. The instructions apply broadly to passenger cars, but the vehicle owner’s manual always takes priority.
What a scissor jack does
A scissor jack is a compact mechanical jack with two pairs of hinged arms that open and close like scissors. Turning a threaded screw spreads the arms apart and raises the saddle, or lifting pad. Reversing the screw brings the arms together and lowers the vehicle.
Most factory scissor jacks are stored with the vehicle’s spare tire or emergency tools. They are designed for short, occasional use, usually to replace a flat tire. Their small size makes them convenient to carry, but it also limits their stability, lifting range, and intended workload.
A scissor jack is not the same as a floor jack. A floor jack normally has a wider base, wheels, a hydraulic lifting system, and greater capacity. A scissor jack generally requires more manual effort and offers less resistance to movement if the ground is uneven or the vehicle shifts.
The jack’s purpose is to raise one corner of a vehicle. It is not a substitute for a vehicle lift, and it should not be used as a long-term support. For work under a vehicle, use properly rated jack stands on suitable ground after following the manufacturer’s support-point instructions.
Safety rules before lifting
The safest tire change begins before the jack touches the vehicle. I recommend treating the setup as a separate step rather than rushing directly to the lifting point.
- Move to a firm, level surface away from moving traffic whenever possible.
- Turn on the hazard lights and set the parking brake.
- Place the transmission in Park for an automatic vehicle or in first gear or reverse for a manual vehicle.
- Turn off the engine and remove the key or keep the vehicle fully secured according to the manufacturer’s instructions.
- Have passengers exit the vehicle and keep clear of the lifting area.
- Use wheel chocks on the wheels that remain on the ground.
- Read the owner’s manual for the approved lifting point, jack orientation, and spare-tire procedure.
If the vehicle is stopped on a freeway shoulder a narrow roadway soft ground or a steep slope personal safety takes priority over changing the tire immediately Call.
Check the jack and surroundings
Inspect the jack before placing a load on it. The arms should not be bent, cracked, badly corroded, or separated from the screw mechanism. The base should sit flat, and the saddle should not be loose. Do not use a jack with a missing handle, damaged threads, or an uncertain weight rating.
Clear loose gravel, ice, mud, tools, and other objects from the immediate area. Never place a small board, brick, rock, or improvised object under the jack to compensate for a poor surface unless the vehicle manufacturer specifically provides a suitable lifting adapter or platform. Improvised supports can tilt or split under load.
Find the correct lifting point
The correct jack point is usually a reinforced section of the vehicle’s pinch weld or underbody near the flat tire. Some vehicles use a marked notch, reinforced flange, frame point, or designated pad. The exact location varies by model, so the owner’s manual is the authoritative source.
Do not guess based only on the position of the tire. Nearby plastic rocker-panel trim, floor pans, fuel lines, brake lines, suspension components, and thin sheet metal may look convenient but may not support the vehicle. Lifting at the wrong location can bend the body, damage components, or allow the saddle to slide.
Position the jack so the saddle contacts the specified reinforcement cleanly. On a pinch weld, the vehicle may have a narrow slot or flat area designed to fit into the jack saddle. The saddle should not press against painted body panels or rest at an angle.
Before lifting, compare the jack’s shape with the manual’s illustration. The screw handle may need to face outward for clearance, and the base may need to sit in a particular orientation. Small differences matter because the jack must remain aligned as its arms extend.
How to use scissor jack step by step
The following process is for a standard emergency tire change. I would not use it as a replacement for model-specific instructions, especially on vehicles with unusual suspension layouts, active ride-height systems, or a spare tire with different dimensions.
1. Secure the vehicle
Park on the firmest level surface available. Keep the vehicle straight rather than turning sharply toward or away from the road. Apply the parking brake, select the correct transmission position, and place chocks on the opposite side of the wheel being lifted.
For example, if the right-front tire is flat, chock the left-rear wheel if possible, while also following the instructions in the owner’s manual. Chocks help prevent rolling, but they do not make an unsafe location safe.
2. Remove the spare and tools
Take out the spare tire, lug wrench, jack handle, and any adapters before lifting. Check the spare’s inflation label or tire-pressure-monitoring requirements if the information is readily available. A temporary spare may have speed and distance limits printed on its sidewall.
Keep tools where they cannot roll into traffic or beneath the vehicle. If the spare is stored under the cargo floor or beneath the vehicle, remove it before raising the car so the process does not become unstable or unnecessarily rushed.
3. Loosen the lug nuts
Remove the wheel cover if necessary, then use the lug wrench to loosen each lug nut while the tire is still touching the ground. Turn each nut counterclockwise when viewed from the outside of the wheel. Loosen the nuts only enough to break their resistance; do not remove them yet.
Apply steady pressure rather than jumping on the wrench If a nut will not move confirm that the wrench is fully seated and that you are turning the.
4. Position the scissor jack
Place the jack beneath the approved lifting point. The base must sit flat and the screw must be accessible for the handle. Align the saddle with the reinforced area before applying meaningful weight.
Turn the screw slowly until the saddle just contacts the vehicle. Stop and check the alignment from more than one angle. The jack should be nearly vertical, with the arms centered under the load. If the base slides, twists, or begins to lean, lower it immediately and reset it.
5. Raise the vehicle gradually
Continue turning the handle slowly. Watch the jack, the contact point, and the tire rather than focusing only on the handle. The vehicle should rise smoothly, and the jack should remain upright as the arms open.
Raise the vehicle only until the flat tire clears the ground enough to remove it and install the replacement. Usually, a small gap is sufficient. More height does not make the job safer; it increases the distance the vehicle could drop and may reduce stability.
Pause after the tire leaves the ground and confirm that the jack base is still flat, the saddle remains centered, and no part of the vehicle is contacting the jack incorrectly. Keep hands and feet away from the space beneath the vehicle.
6. Remove the wheel
Finish removing the loosened lug nuts by hand and place them somewhere clean Pull the wheel straight toward you If it is stuck to the hub do not.
Place the removed wheel flat under the vehicle only as a limited precaution against a low drop; it is not a support and should not be treated as one. If the owner’s manual gives different advice, follow the manual.
7. Install the spare tire
Match the holes in the spare wheel with the wheel studs or hub Slide the spare onto the hub then install the lug nuts by hand Start each.
Tighten the nuts in a crisscross, or star, pattern until the wheel is held firmly. Do not fully torque them while the vehicle is suspended by the scissor jack. Do not use an impact tool on a small factory jack unless the manufacturer explicitly approves that procedure; the sudden force can destabilize the setup.
8. Lower the vehicle
Turn the jack handle slowly in the lowering direction specified by the jack or vehicle instructions. Keep your hands on the handle and watch the vehicle descend. Make sure nobody is near the wheel, jack, or underside.
Once the tire touches the ground and the vehicle s weight is off the jack remove the jack Finish tightening the lug nuts in the star pattern with.
Replace the wheel cover if appropriate, store the damaged tire and tools securely, and check the spare’s speed and distance restrictions. Drive cautiously to a tire shop or other suitable location for repair or replacement.
How high should a scissor jack lift?
Lift only high enough for the flat tire to clear the ground and come off the wheel studs or hub. The required clearance depends on tire size, suspension position, and the amount of air remaining in the tire. A tire with some air may need less movement than a completely deflated tire.
Do not extend the jack to its maximum height simply because more travel is available As the jack opens its geometry can become less stable and a taller.
How to lower a scissor jack safely
Lowering requires the same attention as raising. Before turning the screw, remove tools, loose objects, and the old wheel from areas that could interfere with the descent. Confirm that the replacement tire is mounted correctly and that the lug nuts are hand-tight.
Turn the handle gradually. Do not release it suddenly or allow the screw to spin uncontrolled. Some scissor jacks have a lowering direction marked on the tool; if the marking is unclear, consult the owner’s manual instead of forcing the mechanism.
When the vehicle is fully on the ground, make sure the jack is no longer carrying weight before pulling it away. Store it in its retaining bracket or compartment so it cannot become a projectile during hard braking or a collision.
Common scissor jack mistakes
Using the jack on a slope
A slope increases the chance that the vehicle or jack will move sideways. The parking brake and wheel chocks help, but they cannot eliminate the problem. If the vehicle cannot be moved to firm, level ground, calling roadside assistance is often the better decision.
Leaving the engine running
An idling engine adds noise, movement, and unnecessary risk in a roadside situation. It can also expose people to exhaust, particularly in enclosed or poorly ventilated areas. Turn the engine off unless the owner’s manual or an emergency condition requires otherwise.
Relying on the parking brake alone
The parking brake is important, but it is not a substitute for transmission selection and wheel chocks. A vehicle can still shift if the brake does not hold fully or if the lifted wheel is part of the parking-brake system.
Loosening lug nuts after lifting
A suspended wheel can spin, making lug-nut removal difficult. More importantly, force applied to the wrench can disturb the vehicle. Break the initial resistance while the tire is on the ground.
Placing the saddle on bodywork
Thin sheet metal and plastic trim are not reliable lifting points. Contact in the wrong place can cause visible dents, hidden structural damage, or a slip. Use the marked or documented reinforcement instead.
Using a damaged or undersized jack
Never assume that any compact jack can lift any vehicle. Check the capacity marking and compare it with the vehicle’s required load. A jack that is bent, corroded, missing parts, or difficult to turn should be replaced rather than tested under load.
Crawling underneath the vehicle
A scissor jack is not adequate protection for anyone working below a raised vehicle. Even if the vehicle appears stable, the jack can tip or the screw mechanism can fail. Keep every part of your body out from under the vehicle during an emergency tire change.
Over-tightening or cross-threading lug nuts
Start lug nuts by hand and tighten them in a star pattern. Cross-threaded nuts may feel tight while failing to clamp the wheel correctly. Excessive force can stretch studs, damage threads, distort brake components, or make the next removal difficult.
Scissor jack versus floor jack
| Feature | Scissor jack | Floor jack |
|---|---|---|
| Typical purpose | Emergency tire changes and compact vehicle storage | Repeated maintenance and service work |
| Portability | Light and easy to store | Heavier and less convenient to carry |
| Stability | Smaller base and greater sensitivity to poor ground | Usually wider and supported by rolling casters |
| Operation | Manual screw mechanism | Usually hydraulic pumping mechanism |
| Support requirement | Temporary lifting only | Jack stands are still required for work underneath |
A floor jack is generally the better choice for routine brake suspension or tire work in a garage provided it has the correct capacity reaches the vehicle s.
When not to use a scissor jack
Do not use a scissor jack if the vehicle is on soft soil, deep gravel, ice, a steep slope, or a surface that may collapse. Avoid lifting a loaded vehicle beyond the conditions described in the owner’s manual. Cargo can change the load distribution, and passengers should not remain inside while the vehicle is raised.
Do not use it to lift both ends or both sides of the vehicle at once. Do not use it to support the vehicle while changing suspension parts, removing a fuel tank, servicing the exhaust, or performing any task that requires a person to reach underneath.
Special caution is also needed for vehicles with air suspension, adjustable ride height, low ground clearance, body kits, electric drive components, or unusual battery placement. The manufacturer may specify a particular lifting sequence or prohibit certain contact points. If the lifting instructions are unclear, professional assistance is the safer choice.
After changing the tire
Check that the spare is seated evenly and that all lug nuts were tightened. Recheck the tire pressure when possible, because a spare that has been stored for months may not be ready for normal road use. Confirm whether the spare is a temporary “donut” tire or a full-size replacement.
Temporary spare tires commonly have restrictions printed on the sidewall. Follow those limits for speed, distance, and placement. Some vehicles should not use a temporary spare on a particular axle, especially when the vehicle has all-wheel drive or different tire sizes. The vehicle manual and spare-tire label provide the relevant instructions.
After driving a short distance, stop in a safe place and visually confirm that the wheel remains seated and the lug nuts appear secure. This is not a substitute for final torque verification. Have the lug nuts checked with a torque wrench and repair the original tire promptly.
FAQ: How to use a scissor jack
Can I use a scissor jack without wheel chocks?
You should use wheel chocks whenever possible. The parking brake and transmission position reduce movement, but chocks provide an additional barrier for the wheels that remain on the ground. They do not replace a level, firm surface or correct jack placement.
Should I loosen lug nuts before using a scissor jack?
Yes. Loosen each lug nut slightly while the tire is still on the ground, then raise the vehicle and remove the nuts. This keeps the wheel from spinning and reduces the force that could disturb the jack.
Can I work under a car supported by a scissor jack?
No. A scissor jack should not be the only support for a vehicle with a person underneath it. For under-vehicle work, use a properly rated floor jack and jack stands at the manufacturer-approved support points.
How far should I open a scissor jack?
Open it only until the flat tire has enough clearance to come off and the replacement tire can be installed. Avoid maximum extension unless the vehicle instructions specifically require it and the jack remains stable.
Why is my scissor jack leaning?
A leaning jack may be on an uneven surface incorrectly aligned with the lifting point overloaded damaged or reaching an unstable part of its travel Stop turning the handle lower the vehicle carefully if possible and reset the jack on an approved firm surface Do not try to correct a.
Can I use a scissor jack on gravel?
Loose gravel can allow the small base to sink or slide, so it is not a preferred surface. Move to firm, level ground if possible. If the vehicle cannot be relocated safely, contact roadside assistance rather than placing boards or random objects under the jack.
Do I need a torque wrench after using a scissor jack?
A torque wrench is the best way to confirm the lug nuts meet the vehicle manufacturer’s specification. Tighten them in a star pattern with the vehicle on the ground, then have the torque checked promptly if a calibrated wrench was not available during the tire change.
Conclusion
A scissor jack can safely handle an emergency tire change when the vehicle is secured the approved lifting point is used the jack remains vertical and the tire. A reliable answer to “how to use scissor jack” comes from applying these points to the specific situation rather than relying on one rule.