1. The design of large caterpillar tractor assemble line simulated the change of market, which adopted dynamic flexible mentality.

2. A caterpillar tractor is tugging along the truck that has bogged down.

3. Based on the achievements obtained. the theoretic formula that determine the rut size of the caterpillar tractor and the friction drag coefficient of motion was deduced.

4. Depending on the technology stated above, we finish a program of caterpillar tractor loaded test machine.

5. Photoelastic stress analysis proves reliable line contact simulation of samples for gear style contact fatigue parts designed by Caterpillar Tractor Co. , USA.