Posted by DR. EVIL on April 30, 2019 at 07:47:08 from (174.197.19.72):
In Reply to: Re: 4010 vs 4020 posted by Bob on April 30, 2019 at 04:21:17:
You GOTTA read the fine print on EVERYTHING, Tractor Data is No exception! 4010 speeds are at 1900 rpm PTO speed. 4020 was at 2500 transport rpm, so guess what? 4020 was a tic over 31% faster. 4020 did state 15.5x38 tires on test tractor. 4010 said 13.6x38 was standard tire size on 4010 even though I never saw a 4010 with them,but did not actually say what size was on test tractor, the PDF of the actual test report would state that, but YOU can look that up. The 13.6 and 15.5's are supposed to both be the same diameter, within a revolution or two per mile, so supposedly no difference in speed.
I ran the wheels off Dad's 4010 with 15.5's then jumped on one of 5 4020's or a 4320 the BTO neighbor had all with 18.4x34's and never noticed much difference in speed. The 4010 of course had the third reverse just below 7th gear that none of the 4020's/4320 had access to, gears were there, had to grind/cut the range slot deeper.
I've never seen a 4010/4020 parts book, would not be surprised all the transmission and final drive gears had the same tooth count.
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