IH 175c suction filter cleaning

Hi, I have a dresser 175C that will no longer glmove in forward or reverse. I have done some research and feel as though I need to start by cleaning the suction filter screen. Can anyone tell me exactly where that is under the floorboard? My fluid oil is okay as well. The machine was working fine and all the sudden loss movement. As you can imagine this machine is almost 50 years old and everything is filthy. Thanks and advance

IH 175c suction filter cleaning