I cannot see any slot on the side.
These are the numbers I can find on the chassis:-
582062
Part number 579629
Series 19 550SP
Motor. 190
2850
Self Propelled 573298
If any of this helps.
This is what I have. A swivel gear box and this belt system attached to it. There seems no way of adjusting the tension here. There are to springs put the pulley does not move backwards or at all so I cannot see how the belt can be tension here. ???
Thank you so much. Really appreciate that. I will send some photos as well. It is self propelled. It has a Honda 160 engine. Rear wheel drive. That much I know. It is 550 ST Series 19. I will try and up load photos later. Thank you so much. Sarah.