Limited cat 1 arms are shorter. If you take a mower or something off of a non limited cat 1 tractor, the pto shaft will be too long. This is where the less lift comes into play. Becouse of shorter arms, and typically less ground clearance, you end up with a lower impliment at full lift. The limited cat 1 is found on sub compact and large garden tractors. You can run any limited cat 1 attachment on a cat 1 system, but a lot of ground engaging attachments for cat 1 won't work too well on a limited cat 1 system.