Yes,
You need to be under the haybine behind the rollers. Up high there are two small bolts (1/2"?) that you loosen then there is a sliding adjuster that you tighten. I'm not home or I'd take a picture.
Standing behind the haybine the adjuster is on the right side.
The picture you have above looks like the most upper piece to the right is where the two holding bolts are. That plate is on the chute of the haybine.