Because , as I understand it the XB series is CAT0 and is rated for "limited" CAT1 hitches. I assume you have a 1-series???? Then you have a normal CAT1.Why?
- Modified Category 1 subcompact attachment
- Cat 1 pin — Cat 0 spacing
- 6 tines per flange
- Slip-clutch protected drive line with 1 3/8in. ends and 6 splines
- Cast iron center gear box