How to Inspect and Maintain Jacks and Stands Safely

To inspect a jack or stand, check its rating, structure, locking parts, hydraulic system, and stability before every use. Remove it from service at the first sign of structural damage, unreliable locking, leakage, or uncontrolled movement. Confirm that its rated capacity suits the vehicle, follow the manufacturer’s instructions, and work on firm, level ground. A hydraulic jack is for lifting, not for supporting a vehicle while you work underneath it; use correctly positioned, locked jack stands as the support.

What to check before you put a jack or stand under a vehicle

Before starting, have the equipment, its labels and instructions, adequate lighting, a clean inspection surface, wheel chocks, and any workplace inspection records you need.

Read the label and manufacturer’s instructions for the jack or stands. Confirm the rated capacity, lifting range, approved lifting points, inspection guidance, and any limits on use.
Make sure the capacity applies to the equipment you’re using, not just to a similar-looking model. Never assume two stands or two jacks have the same rating.
Inspect the equipment while it is unloaded. Dirt, a vehicle’s weight, or a raised mechanism can hide cracks, bent parts, leaks, or a damaged lock.
Work on a firm, level surface with enough room to operate the handle and place stands at the manufacturer-approved support points. Keep people clear of the vehicle’s path and never work beneath a vehicle supported only by a hydraulic jack.
Check that the vehicle is secured against movement. Apply the parking brake, select the manufacturer-approved transmission position, and chock wheels that remain on the ground. Follow the vehicle manufacturer’s instructions for lifting points; suspension or body panels may not support the load safely.
Have adequate lighting and a clean surface for examining the equipment. A rag can remove dirt for inspection, but don’t begin by coating the parts with oil or paint, since that can hide damage.
Confirm the equipment’s identity and inspection history if your workplace requires records. If you can’t establish what the item is rated for or when it was last inspected, don’t put it under a vehicle until a qualified person has assessed it.

How to inspect the parts that can make a stand collapse

Inspect each stand from top to bottom, then operate its adjustment and locking parts without a load. Compare the pair if you’re using two stands; a difference in height, shape, or mechanism can reveal damage.

Examine the frame, base, and support post for bends, twists, dents, cracks, or holes that weren’t part of the original design. A stand that rocks because its base is distorted is not safe to use.
Inspect every weld and the metal beside it. Look for cracks, separation, heavy pitting, broken weld beads, or a weld that appears to have been repaired without an approved procedure. Any suspected crack or damaged structural weld requires immediate removal from service.
Check the adjustable post, ratchet teeth, and saddle. The post should move as intended and should not be bent, excessively loose, or damaged at the teeth. The saddle must be secure and free from distortion that could let the vehicle slip.
Pull out and reinsert the retaining pin, if fitted. It should be the correct pin, not a nail, bolt, wire, or substitute. Check for bending, thinning, cracks, damaged holes, and a retainer that doesn’t stay engaged.
Operate the lock or pawl through its full intended movement. It must engage fully and hold the adjustment securely. A lock that sticks, only partly engages, falls out, or can be released by light contact makes the stand unfit for use.
Check the feet and base contact points. They should be present, stable, and free from severe wear, missing welds, or distortion. Remove dirt and stones that prevent the base from sitting flat, then check again for rocking.
Read the capacity label, warning label, and identification markings. If the rating or instructions are missing, illegible, altered, or inconsistent with the equipment, set it aside until its identity and capacity are verified.
Look for corrosion, especially deep pitting, scale around welds, thinning metal, or rust inside adjustment holes. Surface discoloration can be cleaned for closer inspection, but corrosion that reduces section thickness is structural damage, not a cleaning issue.

A stand with a bent post, cracked frame, damaged weld, unreliable lock, missing retaining pin, unstable foot, or unknown capacity should not be straightened and returned to service casually. Do not weld, drill, heat, or substitute parts unless the manufacturer or a qualified repair authority has approved the repair and the equipment has been properly re-inspected.

How to test a jack for leaks, wear, and controlled movement

Start with the jack unloaded and clean enough that fluid trails and damaged parts are visible. Keep hands and feet away from pinch points, and never place any part of your body under a vehicle during a jack test.

Inspect the frame, lifting arm, saddle, handle socket, wheels, and casters. Look for cracks, bent arms, loose fasteners, damaged welds, missing parts, flat or badly worn wheels, and a saddle that is loose or distorted.
Examine the hydraulic cylinder, pump body, fittings, and hose if the jack has one. Look for wetness, oil tracks, cracked or abraded hoses, bulges, damaged fittings, and fluid collecting beneath the jack. A hose with exposed reinforcement or a fitting that seeps under pressure is not safe to keep using.
Check the reservoir and hydraulic fluid only as the manufacturer directs. The level may need to be checked with the jack in a particular position. Low, dark, milky, gritty, or visibly contaminated fluid indicates a maintenance problem; use only the specified fluid and procedure.
Operate the pump and release control through their normal range with no load. The handle should move as designed, the release control should not stick, and the lifting arm should rise without jerking, binding, or drifting down.
Lower the unloaded jack using the normal release control. It should descend in a controlled manner rather than dropping, surging, or continuing to lower after the control is released. Unexpected movement is a stop-use condition.
Perform a loaded check only if the manufacturer’s instructions permit it and you have a safe test arrangement. Use a known, suitable load or the vehicle’s approved lifting point, keep clear of the danger area, and watch for leakage, frame distortion, slipping, unusual noise, or loss of height.
Lower the load in the approved way and confirm that the jack remains stable and controllable. A jack that cannot hold or lower a load predictably must be tagged out, even if the leak or fault seems small.

Do not open a pressurized hydraulic system, add an unspecified fluid, bypass a release mechanism, or continue using a jack to compensate for a damaged stand. Hydraulic repairs and pressure-related work should follow the manufacturer’s procedure and be done by a qualified person.

How to clean, lubricate, and store lifting equipment

Cleaning should make damage easier to see, not conceal it. Lower the jack fully, remove stands from service positions, and wipe off dirt, road salt, moisture, and spilled fluid with a cloth or a suitable cleaner approved for the equipment. Dry the parts afterward, paying attention to adjustment holes, locking mechanisms, wheels, and the underside of the base.

Lubricate only the points named by the manufacturer, such as specified pivots, pins, wheels, or moving contact surfaces. Use the stated lubricant and apply enough for the mechanism to move without creating a dirt trap. Don’t grease a ratchet tooth, pawl, or locking surface if the instructions say it must remain dry; excess lubricant can stop a lock from engaging fully.

Keep oil away from labels, rubber components, friction surfaces, and the floor. Never paint over rust, cracks, welds, or identification marks. If corrosion needs treatment, remove the equipment from service first and make sure the treatment doesn’t hide thinning metal or damage the locking and lifting functions.

Store hydraulic jacks fully lowered unless the manufacturer specifies another position. Protect exposed piston rods from moisture and impact, and keep the jack where it won’t be struck by vehicles or loaded with unrelated equipment. Store stands upright or secured so they cannot fall, with posts and pins kept together. The storage area should be dry, well lit, and free from oil, chemicals, and trip hazards.

The equipment is ready for storage or future inspection when it is clean enough to examine, its labels remain readable, locks operate fully, hydraulic parts stay dry, and nothing interferes with lifting, supporting, or lowering. Record the inspection or maintenance date if your workplace procedure requires it, and note any part that was replaced or any fault that remains under evaluation.

When should a jack or stand be removed from service?

Stop using the equipment immediately if any of these conditions is present:

A frame, arm, post, base, saddle, or other load-bearing part is bent, cracked, split, deeply pitted, or otherwise distorted.
A weld is cracked, separated, heavily corroded, or visibly damaged.
A stand’s pin, ratchet, pawl, or other lock is missing, bent, substituted, partly engaging, sticking, or unable to hold securely.
The feet or base are unstable, damaged, incomplete, or unable to sit flat.
The capacity label or identification is missing or unreadable, or the equipment’s rating is unknown.
A jack leaks hydraulic fluid, has a damaged hose or fitting, contains contaminated fluid, or has a piston rod that is damaged or corroded.
The jack rises unevenly, slips, drifts down, drops, binds, makes unusual noises, or cannot be controlled through its release mechanism.
The equipment has been overloaded, shock-loaded, dropped, exposed to a collision, or used in a way the manufacturer does not allow.
The inspection history is unknown and no qualified person has confirmed that the equipment is fit for use.

Tag the item clearly with a message such as DO NOT USE, identify the defect, and move it to a controlled holding area so nobody puts it back into service. Tell the responsible supervisor or owner. Don’t rely on a verbal warning or leave a defective jack beside serviceable equipment.

Repair is appropriate only when the manufacturer or a qualified repair authority permits it, the correct parts and procedure are available, and the completed repair can be inspected and function-checked. If the manufacturer’s instructions are unavailable, the damage affects a load-bearing or locking part, or the repair cannot be verified, replacement is the safer decision. Never return a tagged item to service because it looks cleaner or because it holds an unloaded test.

Conclusion

Make the inspection part of every lifting job: verify the rating, examine the structure and locks, test a jack for controlled movement, and keep the equipment clean enough to reveal faults. If anything affects load support, locking, hydraulic control, or equipment identity, tag it out and use another inspected unit. A qualified person should decide whether a damaged item can be repaired and re-inspected; otherwise, replace it.

Frequently Asked Questions

Can I use a hydraulic jack instead of jack stands while working under a vehicle?

No. A hydraulic jack can lose pressure or move unexpectedly. Use it to raise the vehicle, then lower the vehicle onto correctly rated, securely positioned jack stands before working underneath.

Can a small hydraulic leak be ignored if the jack still lifts?

No. A leak can worsen and lead to loss of pressure or uncontrolled lowering. Tag the jack out of service and follow the manufacturer’s repair procedure or have it assessed by a qualified repair person.

Is surface rust on a jack stand automatically a reason to replace it?

Not necessarily. Clean the area so you can inspect it, then look for deep pitting, thinning metal, cracks, damaged welds, or weakened locking parts. If corrosion has affected a load-bearing or locking component, remove the stand from service.