I’m looking at a gleaner F. Chevy inline 6 engine. Comes with a 4 row corn head. The insides/threshing components seem to be solid. It needs some loving but it’s not the worst. Anything in particular to look for? How much fuel will it use per hour?
I had a K - KKS K corn and soybean special, it had extra screens to get a cleaner sample.
For Corn it needs the large (20") pully and belt.
The main shaft bearings are the hardest to change they are deep in on those shafts.
Most of the other bearings are pretty easy to change.
Get a parts manual and look over the bearings used. Many are a common 7/8", 1", 1 1/4".
Look over the belts, Many are variable speed and have a variable width pully on one end or the other. If the belt is too worn, you run out of adjustment range.
Check the rasp bars for ware, they have groves that thresh the grain. You can reverse them to get additional life.
For corn it helps to have filler plates between the bars.
Check the rattle chain for missing or broken cross slats.
Check the clean grain cross auger under the machine for pin holes or complete ware thru.
Spin the unloading auger to make sure it is not bent.
Check the fingers on the feed. The guides ware and the fingers get bent.
If you can run it, run the machine at speed and look at each chain and look for a vibration or a pulse. The indicates a bearing is going bad on one of the shafts. Same with belts.
I stocked an assortment of bearings and parts that were common and had good luck being able to run at night while I had a day job.
It cost a couple hundred to have an inventory, but it saved me a lot of extended down time.
That is some of the stuff.
HTH
Keith