How to choose a jack
It is difficult to imagine a more important accessory in the vehicle configuration than a jack. Without it, it is impossible to replace the wheel in the field (road) conditions.
What it is
A jack is a device for lifting loads to a specific height. A characteristic feature of all jacks is the ability to lift a significant load with small own dimensions. These devices are used in production, in construction, in everyday life and, of course, in the field of maintenance and repair of vehicles. In most cases, their main task is to raise the car body to a height sufficient to replace the wheel.
Service stations, as a rule, are equipped with hoists of greater carrying capacity, the purpose of which is to completely raise the car to a height sufficient to repair the chassis, replace the muffler and the like. But in this case we will talk about compact car jacks.
What are they like?
Conventionally, all types of jacks can be divided into:
Hydraulic jacks are divided into rolling jacks and so-called bottle jacks (with a column). Both types of hydraulic jacks are hand-operated devices. By design, they can be divided into single-stem and telescopic. The single-stem jack has, as the name implies, one rod, and the telescopic one has two or three rods or more. A telescopic can lift the car to a great height - this makes replacing the wheels more convenient, but such a device is somewhat more expensive.
A rolling jack resembles a trolley on wheels, which can be rolled under the car body in the right place. The hydraulic cylinder in these jacks is not installed vertically, as in bottle jacks, but at a certain angle (often almost horizontally). In the process of lifting the case, such a jack as it drives up under the car body.
Rolling jacks lift the car significantly faster compared to devices with a vertical cylinder arrangement. However, they also have their drawbacks. The use of this type of jack requires a flat and hard surface. In addition, they, as a rule, are larger in weight and dimensions, therefore, they occupy enough space in the trunk. Rolling jacks are more often used in service stations and tire service.
It is important to remember that bottle-type hydraulic jacks are recommended to be stored and transported in an upright position.
In general, the advantages of hydraulic jacks include:
• High load capacity with small own dimensions;
• Smooth stroke;
• Significant bearing area;
• Low probability of cargo stall;
• Possibility of precise fixation at the desired height.
Among the disadvantages, a relatively low lifting speed can be noted.
The mechanical jack in the most common version is a lever structure with a supporting surface, which is called the pickup arm. The functionality of such a jack is lower than that of a hydraulic one. In addition, it can be installed only at four points under the bottom near the wheel arches, where there are special grooves for connecting the jack. In addition, considerable physical effort is required to work with such a jack. For more insights jump to: best floor jack
The main advantages of a mechanical jack are its simple design and low price. Most modern cars are equipped with diamond - shaped lever jacks. In such a jack, the screw is located horizontally, and the lifting height depends on how compressed or vice versa the shoulders are connected, connected by hinges.