???? about JD 790 ROPS...

kebo · Sep 17, 2012

I think this question will also apply to the 770's, 850's, 870's and probably some other models too that use the three piece ROPS.... What grade bolt is used at the top of the ROPS to join the three sections together, with those two cast iron pieces? The reason I ask is because I just bought a golf cart roof off of a guy on CL and plan to use it as a low budget canopy on my tractor. My idea is replace the 4 bolts that are in the two upright sections with 1" longer bolts, and simply add an extra nut beyond the nut that is already on each bolt. This will keep the ROPS design original, but at the same time it will give me a convenient attachment point for two brackets that I plan fab up to attach the roof to the ROPS. I would imagine these are Grade 8 bolts? Anyone know for sure? Thanks.....

Mechanos · Sep 17, 2012

The markings on the head of the bolt tell the tale. What markings are on the head?

Zebrafive · Sep 17, 2012

They are metric M12 x 30mm grade 10.9

kebo · Sep 19, 2012

Zebrafive said:
They are metric M12 x 30mm grade 10.9

Thanks zebra, that will get me started..... although I am not sure about that 30mm length. The ROPS is 2" thick, which is about 50mm. So that, plus some extra for the washer and nut would mean it would need to be about 44mm or whatever is closest standard size to that. I did look up some M12 bolts on the McMaster-Carr website, those things ARE EXPENSIVE!!! Like about $12-14 each depending on the actual length. I might have to rethink my idea of attaching the roof brackets to the ROPS bolts and maybe just use some cheap U-bolts and plates like a lot of folks have done to mount stuff to their ROPS. Thanks again.