I think he has got the sound from here:
http://www.landtechnikvideos.de/pageID_2543994.html

Have a look at "Fendt Vario 930 fährt aufs Silo".

First version: store.bossenimp.com/ images/Siku/SK4056LG.JPG 2nd Version: First only the 7400 with the new lamps, but later the 7500,too. https://ssl.kundenserver.de/s41234815.einsundeinsshop.de/sess/utn;jsessionid=1543b277e54fd60/shopdata/0120_SIKU+FARMER+HARVESTERS+1=26amp=3Bslash=3B32+=28D=29/ima...

A few years ago Siku built a TW 35. It had a white Grill and you could put a trailer at the front (German word Frontkupplung). The 8830 has a black grill and a front wight.