Criterias of choice
The choice of a jack is often done thoughtlessly and in vain. Such a device can fail at the most inopportune moment. Many already know that the support must be reliable, and the lifting platform with a rubber pad. There are other important nuances of choice.
- Carrying capacity. One of the most important characteristics. It is worth initially calculating the approximate weight of the car, taking into account the things in the cabin and trunk. For a car, you can take a screw tool with a maximum load of 1.5-3 tons. Roll-up or bottle types for 3-8 tons - an option for SUVs. Trucks need more impressive performance.
- Pickup height. You need to make a start from the clearance of the car. Truck and SUV owners usually have a 15 cm headroom, no problem. But for cars it is worth picking up rolling or screw jacks.
- Lifting height. A value in the range of 30-50 cm is possible, this is enough for wheel changes and minor works. Rack jacks raise higher, up to 100 cm. This is a good solution if you have to travel off-road.
For Kraft rhombic mechanical jacks, see the following video.
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The jack allows you to raise the car to the required height and fix it in this position. Tool varieties can be like this.
- Screw rhombic. The long screw is installed diagonally in a four-sided frame. It is he who needs to be rotated to lift. The tops of the frame come closer, but the free ones diverge. As a result, parts of the mechanism run into the car and the ground.
- Hydraulic telescopic (bottle). The mechanism has a piston, a valve and a fluid for operation. Using a lever, the substance is pumped into the chamber and raises the piston. The latter can be in two parts. It is enough to move the valve to the opposite position to lower the jack.
- Hydraulic trolley. The wide base with casters must be guided under the vehicle. The piston pushes the stop at an angle. As a result, the device drives under the car even deeper, raising it. Moreover, the mechanism itself does not differ from the previous version.
- Rack and pinion lever. The long frame with holes makes this jack stand out from other types. This part is installed on the side of the car, holding the upper handles. You can hook the machine onto a hook or wheel. The mechanical clutch is activated by a lever and moves the lift along the frame.