Introduction
The document provides technical specifications and a comparison of ground pressure and bearing capacity for the Huddig 1260B backhoe loader, known as "Muddy Mary," which is equipped with tracks.

Specifications
The Huddig 1260B with tracks has a width of 64 cm, a contact length of 146 cm, and a contact surface per track of 9344 cm², resulting in a total contact surface of 37376 cm² for the machine.

Comparison with Tyres
The document compares the ground pressure exerted by machines with tracks versus those with tyres. A machine with tracks weighing 15 tonnes exerts the same ground pressure as a machine with tyre dimension 520 weighing 3.7 tonnes. Conversely, a machine with tyre dimension 520 weighing 15 tonnes affects the ground similarly to a tracked machine weighing 59.6 tonnes.

Tyre Dimensions and Contact Surface
Three tyre dimensions are compared:

• 620/60x34: Width 57 cm, Contact length 40 cm, Contact surface per tyre 2280 cm², Total contact surface 9120 cm²
• 520/70x34: Width 47 cm, Contact length 40 cm, Contact surface per tyre 1880 cm², Total contact surface 7520 cm²
• 710/55x34: Width 66 cm, Contact length 40 cm, Contact surface per tyre 2640 cm², Total contact surface 10560 cm²

Improved Bearing Capacity
The document highlights the improved bearing capacity of tracks compared to tyres:

• Dimension 520: 397% improvement
• Dimension 620: 310% improvement
• Dimension 710: 254% improvement

Conclusion
The "Muddy Mary" backhoe loader is designed to minimize ground impact, making it suitable for use on terrain with poor bearing capacity. The use of tracks significantly reduces ground pressure compared to traditional tyres.