Combines 750 tires IJ

My only comment on this whole line of thinking is I know how bad those belts can slip on those hydros going up steep hills in road gear going between fields. Are you going to be in 2 low just to climb them with the 30.5-32's and the next thing is can those final drives handle the extra large tireIJ I have never seen a 750 setup like that. Not saying there never have been and that they were not successful, just myself, never seen one. I'd be leary. Guess there is one other thought as well. 30.5-32's......going to have to change the rear tires as well so when you throw in the 4wd your not at 2 different gear ratios. Next thing, will that 6 cylinder perkins have enough Umph in her to pull that kind of ground coverage especially in some serious mud like we've seen some years. I'd still be leary. Just some food for thought.

When I had A 750 it had 24.5 x32 it ran in steep hills. I would use it to cut bottoms and tops of the ridges. It would pull any hill in second gear,tighten hydro belts all the way.good luck

There should not be a problem on ratios since the rear drive is hydraulic isnt itIJ

Go with the 30.5s you won't be sorry, especally if you have any soft conditions. I had a 77 750 I bought used with the 23X30 tires. I put 30.5s and RWA on it the second year and ran it for 10 years with no drive problems. It also had tank extensions. The only problem with the 30.5s is that it raised the machine enough, that I could not unhook the head unto the ground. and I had to tilt the floater bar so as not to plow. After the first two years I put on a feeder extension which solved that problem. It also won't effect the ratio of the RWA, as it is also hyd driven in parallel with the main drive. Good luck Joe

Now lets think about this a second. Even if the rear ratios don't warrent having to change the rear tires your still going to have a combine then that looks like it's going up hill on level ground. unlevel seives and walkers tend to make a person lose more grain.

I put 18.4 x26 tires on the back with the 30.5s and it sat in a down hill fashion. When I put the RWA with the 14.9x24 tires the machine was setting fairly level to slightly downhill. The RWA I had was a JD unit painted red. and some of the RWA units I have seen could be adjusted for different axle heights. And I agree that the leveler the combine the better. Joe

We run a grey cab 760 with 24.5 x 32 tires on - 30.5 were a factory option in Australia for these machines - I dont think you will harm the final drives as the previous owner of our machine put enough stress on the system to crack the main axle beam (under operators platform)and never had final drive worries -machine has 2500 hours on. One problem we had was they (old owner) fitted 1400x24 grader tires to the rear - when we put it into hilly country with a lot of turning we killed rear axle bearings in less than 50 hours till we put it back on correct diameter wheels, also used to choke the machine with short straw at the front of the walkers in hot dry crop conditions because it was jacked up too high at the rear. 10.00 truck tires are just right diameter for these 2WD grey cab machines.