Posted by James22 on March 12, 2012 at 22:10:46 from (207.179.239.66):
In Reply to: IH combine head posted by ken wolfe on March 12, 2012 at 15:23:37:
The 800 series head as mentioned was quite a bit heavier. It has bushings rather than bearings at the lower end of the stalk rolls. Output shaft on the gear boxes uses pins that habitually wallow out the shaft hole. These double roll pins then easily break or work/fall out. Many convert to bolts which work pretty good even if the shafts are worn, although they give up some shock protection. The 900 is splined and doesn't have this problem. Nearly all 1000 series parts will fit the 900 which isn't true for the 800. So if you want the 1000 updates they are much easier/cheaper to install on the 900. The 800 is a good head and the bushings will last longer than the 900 needle bearings if you don't grease often enough. The 900 had aluminum rolls which can fatigue. Those with any amount of hours have already broken and likely replaced with the 1000 series malleable iron. The early 900 aluminum gear boxes had a tendency to leak and most if not all were updated to fix this problem.
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