Scale ZX300LCH-7 Hydraulic excavator The Hitachi ZX300LC-7 fits nicely in the line up between the ZX250-6 and the ZX350-6 models already produced. Once again, the level of detail is to a very high standard, with a European specification tracked undercarriage that has tensioned idler wheels keeping the track chain taut. The lower roller detailing in integrated into the track frame castings and each track pad has raised grousers and bolt detailing.