Hydraulic height adjusting system for a vehicle

A hydraulic height adjusting system for adjusting the height from the ground of a vehicle having a body, a pair of front wheels, and a pair of rear wheels,

• the height adjusting system comprising:
• a first pair of hydraulic linear actuators placed each between the vehicle body and a respective rear wheel such that the extension and compression of each of the hydraulic linear actuators of said first pair of hydraulic linear actuators bring about an increase and a decrease, respectively, in the distance between the vehicle body and the respective rear wheel, and an increase and a decrease, respectively, in the height of the vehicle body from the ground at the rear axle of the vehicle,
• a second pair of hydraulic linear actuators placed each between the vehicle body and a respective front wheel such that the extension and compression of each of the hydraulic linear actuators of said second pair of hydraulic linear actuators bring about an increase and a decrease, respectively, in the distance between the vehicle body and the respective front wheel, and an increase and a decrease, respectively, in the height of the vehicle body from the ground at the front axle of the vehicle,
• a supply unit for generating a flow of fluid under pressure,
• a tank,
• a hydraulic circuit connecting the first and the second pair of hydraulic linear actuators with the supply unit and with the tank, and
• a flow controller arranged to control the flow of the fluid under pressure to and from the first and the second pair of hydraulic linear actuators,
• wherein said flow controller is configured to ensure that the height of the vehicle body from the ground at the front axle is always less than that at the rear axle during raising or lowering of the vehicle body.