How to Use a Floor Jack Safely: Step-by-Step Guide? | Lift, Then Lock

A floor jack lifts a vehicle; jack stands hold it, so raise the car at its approved lift points, then transfer the weight to rated stands before anyone goes underneath.

The most expensive mistake with a floor jack costs nothing to avoid: leaving the car hanging on hydraulic pressure while someone slides beneath it. A floor jack is a lifting tool, not a support device, and the entire safe procedure comes down to moving the load onto stands the moment the car clears the ground. The steps below follow CDC/NIOSH jack-and-hoist guidance and the jack manufacturer’s own manual, so you can raise a car and work under it without gambling.

What Do You Need Ready Before the First Pump?

Before touching the jack, line up the right equipment and a surface that can carry the load. Anything less than a hard, level floor introduces the failure mode that causes most jack accidents.

• Read both manuals first. Your vehicle’s lift points and the jack’s capacity, inspection, and operation rules differ by make and model.
• Pick hard, level ground. Concrete or solid pavement only. Skip slopes, gravel, dirt, and soft asphalt.
• Secure the car. Shift into Park or a manual gear, set the parking brake, and chock the wheels staying on the ground.
• Inspect the gear. No loose, bent, worn, or leaking parts on the jack or stands. Pull anything defective from service.
• Confirm rated capacity. Never exceed the jack’s rating, and check whether your stands list capacity per stand or per pair.

That last point trips up plenty of buyers. Matching a jack and stands to the load is the difference between a tool and a hazard; our breakdown of the best USA-made floor jacks covers rated capacity and build quality if you’re still shopping.

How Do You Raise the Car and Set the Stands?

Place the jack saddle under the manufacturer’s specified lift point, raise slowly and vertically, then set matched stands before releasing any weight. The saddle must sit fully seated and the jack must stay perpendicular to the load.

1. Position the saddle directly beneath an approved lift point. Never improvise with suspension, body panels, or exhaust parts.
2. Pump slowly. Watch for shifting or slipping and keep everyone clear. No part of your body belongs under a car held only by the jack.
3. Slide in a matched pair of stands at the approved support points, both at the same height and fully seated in their saddles.
4. Lower onto the stands slowly until the full weight rests on them, then retract the jack.
5. Verify stability by confirming both stands are locked and firmly placed. CDC/NIOSH guidance suggests a gentle test lower to confirm placement, without shaking the car.

Only then do you crawl under. Never run the engine while the car sits on stands, and never use a bumper jack for this work. The CDC/NIOSH jacks and hoists checklist is a quick pre-job review worth keeping in the garage.

Where Do Most Floor Jack Accidents Start?

Nearly every serious injury traces back to skipping a step, and the big ones are predictable. A jack alone holding the car, a soft or sloped surface, and unlocked stands account for most of them.

• Trusting the jack as a long-term support instead of transferring to stands.
• Working on gravel, grass, or an incline.
• Forgetting chocks, the parking brake, or Park.
• Mismatched stands or a height mechanism that isn’t locked.
• Shimming blocks between the saddle and lift point, which invites slipping.
• Adjusting the jack’s safety valve or otherwise modifying the equipment.
• Leaving a long handle where someone can trip over it.
• Lifting large trucks or trailers without equipment rated and configured for that load — CDC flags this as a severe-injury risk.

Lowering deserves the same care. Clear tools and people from underneath, reposition the jack at an approved lift point, raise just enough to free the stands, pull them, and lower slowly.

When Should You Skip the Floor Jack Entirely?

Some jobs and some loads fall outside what a standard floor jack and stands handle safely. If the equipment isn’t specifically rated and configured for the vehicle, don’t force it. Heavy trucks, trailers, and anything sitting on an unstable surface need purpose-built equipment, and no shortcut is worth the risk. For everything else, read the manuals, work on solid ground, lift at the approved points, and let the stands carry the weight every single time.