. OPERATION MACHINE OPERATIONS AND CONTROLS is in reverse in this condition, the rubber 3 - 115 Mechanism of rubber shoe coming off track 1) When travelin g over an obstac le, a gap i s formed between he track rolle r and the rubber shoe . In this c ondition, the ubber shoe 2) Furthermore, ravel ga ormed betwe en the track rolle r, idler, an d rubber shoe When turning in a c ondition where th e rubber s hoe cannot move to the side becaus e of the object it is passing over , or because of some other obje ct. When the rubber s hoe has moved o ut of alignment and the i dler or track roller are n ot aligned with th e core. the shoe will come off.