Help you to read caterpillar excavator model

Regarding the Famous excavator model letter, I believe that many people have less understanding what is indicate , in fact the model letter and number has specific meaning, to understand these numbers and letters that can help us to understand excavator important parameter, here we Caterpillar as example

For Caterpillar excavator models, such as 320D,

3 stands for excavator (product type),
20 stands for 20ton (tonnage),
D represents D series, D is newer machine compare with B,C

If L is after series letter, example CAT320DL, L stands for long truck excavator