Farm Equipment - F2 Conversion

F2 Conversion

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=208710
Printed Date: 30 Oct 2025 at 11:14am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: F2 Conversion

Posted By: tractorman21
Subject: F2 Conversion
Date Posted: 29 Oct 2025 at 5:35pm

    Hello,
          I am going to install a straw chopper on a F2 and get rid of the 2 belt system currently on the machine. It's a short back model and I am having a little bit of trouble finding the right chopper belt. Does anyone know the correct part number for the belt?

    Is there anything else I should do to the machine after installing the straw chopper? It's an older machine but everything else looks just like my other F2 and somewhat like my F3. I am going to change the cylinder bars to the high performance bars and was wondering if there are any other improvements that could be done.

Thanks for any thoughts,

Replies:

Posted By: DrAllis
Date Posted: 29 Oct 2025 at 5:43pm

Improvements?? What crops ?? corn and soybeans are waaay different than cereal grains.

Posted By: AC7060IL
Date Posted: 29 Oct 2025 at 6:36pm

71136325 is chopper belt for 1977 F2 shortback sn 36201-39200.

Speed up F2’s clean grain belly auger/grain tank elevator to accommodate aggressive cylinder bars increased threshing capacities. Could remove combine's right rear "Idler-Lower Chain" double sprocket (original 71147857 1977 F2). Once removed, use a grinder/torch to remove idler's outer sprocket (driver for clean grain auger/elevator) & weld on a larger diameter sprocket to increase clean grain auger/elevator driven speed by 200-300 rpms??

Or maybe call your AGCO parts person & inquire for availability of their "Idler -Lower Chain" 71151725 sprocket assy (Elev. speed up kit). Good luck as it may be NA? Anyway this kit part # is listed for the long back F2 (39201&up) in the 1978 parts book. To my knowledge, it was not listed for the short back 77' F2 parts book? If your AGCO parts person can locate one, I think it is a suitable replacement & correct fitment between F2 years?? AGCO online parts book does not show availability for 71151725, but does show availability for a 71151724 @ $143.64. Guessing that might be a sub for 71151725, but not sure?? Best to call your AGCO parts person & inquire.

Posted By: SteveM C/IL
Date Posted: 29 Oct 2025 at 9:22pm

My 78 F2 has that speedup sprocket on it. The elevator is a humming in corn! I made a large elevator drive sprocket to slow down clean grain in beans.