Good news, that's very easy and it works well. It is my own setup.
1- First install the Logitech Profiler application, create a profile for CS2015. Test, calibrate and configure your joysticks as you like.
2- Start the game from Profiler, open the menu and go to Options / Key Assignments. Scroll down to the "Large excavator". For each function, click on the secondary assignment and move your joysticks accordingly. The game will register an axis such as "LeftStickLeft1", where "1" is the joystick's ID number. Note: "LeftStick" does NOT mean your left joystick.
3- Do the same for "Tracked vehicles" if you want to control the tracks with your joysticks.
4- Try the excavator and correct as needed.

The bad news is, Windows has a bug with USB device IDs. At startup, it may assign different IDs each time. This means that your "1" joystick may become "2" the next time you start your computer. When this happens, you have to do the key assignements all over again, or do what I do: prepare an assignement file for both cases and copy them in your CS2015 game profile folder as needed.

OMG thankyou soo much do u know how to do it for farming simulator 15 cos everybods else just say sget new driver software

Sorry, I don't have this game.

:) ;D
COOL COOL COOL LOOL LOOL LOOL