### Jacks and Jackstands

A vehicle must be raised in order to lubricate the chassis, change the oil and gain access to various parts under the vehicle. Above all, a vehicle must be raised and supported safely. Never attempt to work under a vehicle supported only by a jack.

The jack that comes with the vehicle is suitable for raising the vehicle, but is not suitable for supporting the vehicle while you work under it. Once the vehicle is raised, place safety stands under it before attempting any work.

Scissors jacks are the least expensive types of jacks. These are mechanically operated by a threaded rod that is turned inside a diamond-shaped frame. Cranking the screw causes the diamond-shaped frame to expand or contract, raising or lowering the vehicle.

Hydraulic jacks are the best and quickest means of lifting a vehicle off the ground. Hydraulic jacks run anywhere from $30–$300, depending on the size and quality of the jack. They are available as small units that can be picked up easily in one hand and placed where needed, or as large, heavy units equipped with wheels to move them about. The smaller models work slowly and tip over easier.

Hydraulic jacks use a pump to push hydraulic fluid against a ram that operates the lifting pad. They have seals that are prone to leaking. This is one good reason why you shouldn't work under a vehicle supported by a hydraulic jack. If the seals leak, the jack will lose pressure and the vehicle will slowly (or quickly) fall to the ground.

Jackstands are the safest way to support a vehicle. They are made of heavy metal, and are adjustable for different working levels. Once you have raised the vehicle to a convenient height, the Jackstands are adjusted underneath it and the vehicle is lowered onto the stands. Professional Jackstands are the easiest to use, but cost the most. Occasionally, if you're very fortunate, they can be picked up used from a service station that is going out of business.

Drive-on ramps are the alternative to jacking and supporting the vehicle. A good set of pressed steel ramps can cost as much as $40–$70, but they are often worth the expense. Be sure to check the angle of the incline on the ramps. With extensive use of front spoilers and air dams on today's vehicles, often there may be clearance problems.

Fig. 6: A hydraulic floor jack and a set of jackstands are essential for lifting and supporting the vehicle

Fig. 7: Car ramps may substitute for a jack and jackstands, however, old style ramps don't provide adequate clearance for late-model vehicles...

Fig. 8: ...new style ramps have angle adapters to allow clearance for front spoilers on many of today's vehicles.

Fig. 9: When using ramps or jackstands, always block the wheels on the opposite end of the vehicle