Some models of crawler cranes have a swing-travel jaw clutch that is controlled by one lever Figure 12-5.≼rawler-mounted crane quadrants of operation. NOTE: Consult the operators manual for detailed in- formation if required to track travel for more than 1 mile, Steering of the crawler crane is performed by engaging the steering lever in the direction you want the crane to turn. When travel distance exceeds 1 mile, transport the crawler by tractor-trailer.

Additionally, traveling the crane a long distance at one time causes extra wear to the tracks. Because of the slow travel speed, it is not productive to try to travel more than 1 mile. The turning radius of the crawler crane is about the length of the tracks, which travel 1/2 to 2 mph. When the crawler crane is climbing grades, the maximum grade capability is 30 percent on firm, dry material. Based on the two degree of freedom model of kiloton all-terrain crane, he effects of relationship of deflection angle on turning radius were investigated in. This feature gives the crawler crane a low ground bearing pressure of 5 to 12 psi, giving the crane the versatility needed to travel over soft terrain. The size of the crawler treads spreads the weight of the crane over a large area. Also, the crawler crane has steering with positive traction that permits the crawler crane to travel and turn without cutting up the work area or roadway. The formula is: R (WB) / tan (), where R is the turning radius, WB is the wheelbase, and is the angle of the turn. The primary advantage of the crawler crane over the truck-mounted crane is that it is better suited for continuous work in remote areas that are not readily accessible to truck-mounted cranes because of terrain conditions. The turning radius can be calculated by dividing the wheelbase of the vehicle (the distance between the front and rear axles) by the tangent of the angle of the turn.

Crane turning radius