For this tractor be a MR you need fix on 8690.xml

deltaY front wheels put this: deltaY="0.01"

on moddesc.xml:

You need remove specialization name="extraWeights"

and add this: <specialization name="realisticBallast"/>

and remove <specialization name="PloughingSpec" /> because very high fuel consumption (this script is not compatible with MR engine.

and you need add this:

<l10n>
<text name="ATTACHER_CONTROLS"><en>Rear Attacher UP/Down</en><de>Rear Attacher UP/Down</de></text>
</l10n