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17" is probably a big machine unless someone stuck them on there. HGs and OC3s usually have 10" pads. The gauge of the tracks is a better indicator than pad-width. Gauge is the measurement between the centerline of the two tracks.Measure the gauge, count the bottom rollers, and ID the engine - and then it will be easy to identify. There are an awful lot of different Cletracs - but in my area, the HGs, OC3s, and OC4s are the smaller ones and seemed to have avoided the scrapyards better than the big ones. Next in line are the ADs and OC12s - but this probably varies by regions. Little wide-track HGs were popular farm tractors in my area - HG68s. HGs and OC3s were made in 31", 42", and 68" under normal production. They have Hercules four cylinder engines and Clark three-speed transaxles.
ID plate is on the clutch-housing. My HG and my OC3 both measure up at thus: Approx. 7 feet long (the track) and 4.3 feet wide. 51” outside to outside, 31” inside to inside, or 41” on center. Each track has 30 links and pads - 10” wide,
and 3 bottom rollers. Your best bet is find out what engine is in there and that will narrow things down a lot. You can go to Cletrac.org for photos.
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