Here are some photos of the TC30, a TC33 with a 15LA and another with the 7308 loader, plus a photo of my tractor with the 16LA loader. You can clearly see that if there is no backhoe installed on the TC30 and TC33, no subframe is mounted. When the TC30 has a backhoe, the subframe is added. However, on the TC45 with the 16LA loader and no backhoe, there is still a subframe. The subframe on the TC45 and all Class III Boomers is very beefy. Is this the info you were looking for?
Yes, Those are great pictures. My TC-29D is just like the TC-33, there is no subframe, I love the subframe on your tractor, wish mine had one like that.
The subframe on the Woods bakhoe attaches to the loader frame with one long pin. The holes that the pin go through are not machined for a close tolerance fit, so there is some play in that attach point. My guess is that the backhoe subframe is designed to support the backhoe and not to reinforce the loader.
Thanks Jim