Yes, you can! Machine wash is even more preferable than hand wash, because after machine wash knitwear comes out almost dry. Strictly follow our instructions on how to wash it properly - use wool program, don't put temperature higher than 30°C, put 600 spin speed. When you will take your knitwear out the washing machine, don't hang it, but put onto some surface to let dry. Never use centrifuge when washing a knitwear!
Basically knitwear doesn't require frequent machine wash, for some garments (i.e. made of alpaca) being on a fresh air is quite enough to stay fresh.