Rack jacks

A rack jack is a type of lifting device used in the automotive and other industries. The mechanism is distinguished by its simple design and reliability, which has made it popular among drivers. The load capacity of a given model is relative. This jack design has been mass-produced for 110 years.

Design

Lifting is achieved through a ratchet mechanism that moves along a metal rack with holes. A lever mechanism moves the housing with several stops, ensuring movement along the rack.

The rack jack is also known as a Hi-Lift jack.

Operating features

The rack jack has become widespread among drivers thanks to the end of the rack, positioned perpendicular to the main structure. This part sits at a height of 10–15 centimeters, which allows lifting vehicles with low ground clearance.

The advantage of the rack jack is the ability to move a vehicle in the horizontal or vertical plane without significant effort. The low pick-up point allows lifting vehicles positioned at ground level.

To achieve a load capacity of more than 5 tonnes, the weight of the device and the dimensions of the rack need to be increased. For this reason, the use of rack jacks for lifting heavy-duty vehicles is limited.

Manufacturers equip the mechanism with several lifting stages for the convenience of drivers or maintenance personnel.

How to choose

Before purchasing, you need to determine the required load capacity of the device. Manufacturers offer models from 3 to 10 tonnes. Hi-Lift jacks, produced by the American brand for more than 100 years, are considered reliable. Cast-iron Hi-Lift jacks weigh up to 40 kg but offer high reliability.