RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
give a shot of air to the tire to get it pumped up, then wet the stem to see bubbles. if none, wet around bead. as said. a lil soapy water in a squirt or spray bottle helps.
many tiems these are tubed tires anyway.. so a leak OTHER than the stem means you need to break it down to patch / repalce tube, and celan up rim, etc.