tractorhogg 612 #1 Posted March 23, 2015 1973 the first year for the D series shows three different model numbers, the 1-0601, 1-0610, and 1-0620. I've heard one model had small bolts on the differential that caused issues with the transfer case cracking/breaking. Can anyone tell me any other difference, because I would think there would be separate manuals? Thanks, Tractorhogg Share this post Link to post Share on other sites
"D"- Man 827 #2 Posted March 23, 2015 1973 was the only year for the 18 Automatic. The 4 "D" series came 1974 and later: D-160 Kohler, D-160 Onan, D-180 and D-200. All were similar but attachments would pretty much interchange. The D-250 was an entirely different tractor. 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,466 #3 Posted March 23, 2015 1973 the first year for the D series shows three different model numbers, the 1-0601, 1-0610, and 1-0620. I've heard one model had small bolts on the differential that caused issues with the transfer case cracking/breaking. Can anyone tell me any other difference, because I would think there would be separate manuals? Thanks, Tractorhogg Don't forget the model 1-0600. Back in the day there is literature to suggest they considered these the 600-Series. Later the 600-Series was used for the Zero-turn models. Here is when the differential bolts changed to 3/8" Garry 1 Share this post Link to post Share on other sites
tractorhogg 612 #4 Posted March 23, 2015 (edited) Don't forget the model 1-0600. Back in the day there is literature to suggest they considered these the 600-Series. Later the 600-Series was used for the Zero-turn models. Here is when the differential bolts changed to 3/8" Garry I guess my question was/is: What differences were there in the three models within the 1973 model year, that required a change in model designation, and were there specific models that had issues or problems? Thanks Garry for the list of changes, I'm wondering if there were any more. So you are saying that models 1-0601, 1-0610, 1-0611, 1-0620, 1-0630, and 1-0650 D series tractors (even though the first model was a 18 automatic, it's listed as a D series in the Wheel Horse Model list) of 1973 AND 1974 had the smaller/weaker bolts in the differential? Were these bull gear bolts, or what were they? Thanks a bunch. Edited March 23, 2015 by tractorhogg Share this post Link to post Share on other sites
"D"- Man 827 #5 Posted March 23, 2015 (edited) I think the 3 model designations had to do mostly with the rear wheel/tire size and tread design be it 12" vs 15" or be it turf vs ag/cleat. The front wheel/tire sizes were also perticular to certain model #'s if I remember correct. Edited March 23, 2015 by 23 Automatic LSE Share this post Link to post Share on other sites
