175 diesel battery

I need a new battery for my 175. The battery that's in it is definitely not the correct one. The parts book doesn't give any specs on it. Does anyone know the correct CCA and the group size? Thank you for any information.
 
I'd have to go look in my tractor to be sure, but I think it's a group 31. They're very popular in trucks with stud terminals. I switch over to stud terminals every chance I get. They're available in several CCA ratings, up to near 1000. I'm told that with the higher CCA rating you sacrifice durability. More, thinner plates, closer together, or something like that!
 
I just went out and looked. Book says 30H. My tractor has a 31A-725. That was in it a couple years ago when I bought it. It was still good, so the only change I made was run a ground cable right to the starter. Now I see another battery terminal I need to clean! Blasted posts!
 
Thank you for looking. I have heard the same thing about the plates but also know that to a battery with to low of CCA can cause a starter to fail prematurely. That's why I was asking. Appreciate the info!!
 

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