Adobe Premiere Pro CC - Crop a video and export at the exact cropped size
I found that using Adobe Media Encoder is much easier when just cropping.
Add the video to the queue and open the export settings.
On the source tab you can crop the video and there you can also enter how many pixels to remove at each side.
Remember to set the correct output size in the video tab on the right side.

Here is a screenshot showing how i did it: