John, if it"s like my MINOSagri, it is designed to slide on the ground. Mine has two plates (disks) under the cutting disks, mounted on bearings, designed to slide on the ground, independent of the rotating cutting disks. See the link below.
I don"t know what is eating his belts = mine is a different manufacturer, has 4 (count them), drive belts - B-122 or the metric equivalent. Only problem I"ve had is that belts are completely enclosed (not open like this illustration) and as the belt tightener did it"s job, the pulley and back sides of the belts started rubbing on the shield/housing.
I"m very interested in this man"s problem, as I am new to drum mowers this season. Man, has it revolutionized my hay cutting operation. No clogging. No breaking of guards, every time I hit a mole hill. Eats whatever I have to cut, looks for more. Literally can cut as fast as I want to drive. Change of blades costs me $10, and ten minutes.