Great, I'll plan to attach it to the seat bottom. It doesn't look like it actually needs the two angles shown in the IPC to do so though. But, I have an aftermarket seat installed--better than the original John Deere see actually--and I'm sure the original Grammar seat was different and likely...
I wound up purchasing a used original John Deere ROPS I found on eBay for my 1970 John Deere 820 3-Cylinder tractor. I am fixing it up and painting it in preparation to put it on the tractor now. The fenders had basic U-Bolts in them, so I am planning to replace those with regular Grade 8 high...
I'm a mechanical engineer and have to admit I wasn't familiar with Grade 9 bolts either, but apparently, they exist. Here's a link to some 5/8-11 Grade 9 bolts on eBay: 5/8"-11 x 1 1/2" (FT) Coarse Grade 9 Cap Screw (Bolt) L9 - USA Yel Zinc | eBay
Excellent information! Thank you for the bolt sizes and strengths. As best I could tell from clicking around the internet, I looked like a 5/8-11 Grade 8 bolt, but I had to be sure. Frankly, if I wanted to go for overkill, I guess I could even put a Grade 9 Bolt. I see some of those on eBay too.
I recently purchased a used John Deere P/N AL70191 Roll Guard and intend to install it on my tractor. Unfortunately, the fellow I purchased it from cut the attachment bolts with a cutting torch. I looked the bolts up and John Deere wants over $250 each for them! I was thinking of purchasing some...
I restored by Dad's 1970 model John Deere 820 (3 Cylinder Diesel) tractor. I am 60 years old now and I drove it brand new right after they unloaded it when I was 10 years old. It was the worse for wear after my Dad passed away in 2008 but, I brought it back to life and use it every time I am at...