Would depend somewhat on the particular piece of machinery, it's exact designation under the "Harmonized Tariff Schedule of the United States" and it's country of origin. If it were made here in the US, I would think nothing other than the usual brokerage costs and filing charges. HOWEVER! Be very careful about EPA emissions regulations! If it's newer than 1995 you will have to make sure it has a proper EPA label on the engine proving it adheres to the correct EPA emissions Tier in effect at the time of manufacture. Shoot us some more information, if you like I can ask my brokers about it.
Cheers,
Lanway