• Low cost
• Low clearance (± 8 cm)
• Higher traction needed:
- more hp needed
- increased consumption
• Low obstacle clearance potential
• Weight of the whole vehicle supported by one single axle!
• Wheel and axle overloading
• Maximum leaf crushing
• Too high strains on leaf supports, axes, etc.
In order to lessen the impact of these elements, JOSKIN has developed its own hydraulic running gear: Hydro-Tandem + Hydro-Tridem.
Simplicity, clearance and stability: these are the three key specifications of the Hydro-Tandem/Tridem running gear. It combines the following advantages: the axles can easily be pulled over obstacles and they are semi-independent. That is why they allow a significant clearance (up to +/- 250 mm).
Given the design of the JOSKIN Hydro-Tandem/Hydro-Tridem, the ground pressure is perfectly distributed over the wheels. The ground is therefore less compressed, which allows to spare its structure. The stability of the vehicle will therefore also be significantly improved. Each axle is pulled by leaves attached to a ﬁxing element that is located ahead of the assembly.
Four or six hydraulic rams are placed two by two or three by three on both sides of the chassis. Those of a same side are linked to each other in closed circuit and the oil flow takes place according to the communicating vessels principle. The independence of the circuits on each side of the vehicle, combined with the incompressible properties of oil, ensures a perfect side stability and prevents swaying. This explains why the vehicle is less likely to tilt when driving in bends and on hills.
The first lifting axle is standard mounted on all Hydro-Tridem vehicles.