WD45 and WD rear tire sizes

All,

I understand that 13.6X28 is the common rear tire size for the WD. Also you could get the 14.9X28 for the 45's? Why didn't AC incorporate the 16.9X28's on the 45's? I have talked to guys and have had mixed results. Wouldn't faster be better?

I replied to your e-mail. Did you get it? Seems to me like AC was kind of stingy with both rim, and tire size. Most WD45's around here had the 14.9x28[or earlier equivalent] I have seen a couple with the 13.6x28.

(quoted from post at 17:03:10 09/14/19) I replied to your e-mail. Did you get it? Seems to me like AC was kind of stingy with both rim, and tire size. Most WD45's around here had the 14.9x28[or earlier equivalent] I have seen a couple with the 13.6x28.

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Bob,

I did get your email. Thanks.

Installing 16.9 x 28's on my Dad's stock WD45 wouldn't have worked well some days when plowing. Too FAST for second gear and 3 x 16's. So, how do you think plowing would have worked in LOW gear ?? Not too good....

Early WD's had a 12.4 x 28 tire and later had 13.6 x 28's. WD45's started with 13.6 x 28's and later models were available with 14.9 x 28's. Interestingly enough, second gear ratio in an old WD was 9.2 to 1 and the WD-45's were 9.7 to 1, which is 5% slower, I assume to make up for the larger tire to match actual plowing speed to the engines HP. All D-17's were -15% slower than the WD-45's. These gear ratios are thru the differential and do not include the final drives, which are all the same at 5.47 to 1.

My Dad bought a WD-45 in the last year they were made, and got 14.9's from the factory. He got a fully mounted 3-14's plow and a 12 1/2 foot disc. That gas tractor dyno'd at just over 50 horsepower. We always
farmed some nice soil, and he liked to go fast. He pulled those 3-14's in third gear, and rarely used second gear, unless it was 3-4 years growth of alfalfa sod. As we expanded the farm, he bought and early IH
656, and I took over the Allis. Made me an Allis fan to this day!

HA-Ha... I plowed a little, one day in low gear up one hill, first field we plowed with "My Tractor",
not sure why Dad thought that John Deere R, gutless pig that it was, should be mine! Tried to pull 4-
14's in Alfalfa sod. Couldn't begin to pull the plow in 3rd. Had one clay sidehill that I had to climb
and turn on, and it just lugged down slower and slower in 2nd. Had to stop at bottom and shift to 1st. We
were plowing around the outside of the 40 acres, Dad was plowing the corners with the Super M-TA and IH
#8 3-14's running in 3rd, he'd round off the 4 corners and I'd just about catch him and then he'd take
off and run away from me. Both tractors rated 48 hp but the R sure didn't act like it! The rest of that
spring I plowed with the R pulling our other #8 3-14's. Could run in 3rd gear, which was still slower
than 3rd in the SM-TA. Still had 16 acres left to plow when Dad sold the R to the township road
commissioner. He wanted it to run a big heavy duty rototiller and pull a big road drag. The rototiller
knocked the PTO out of that R 3 straight years and was traded for an Oliver 770 diesel that they ran for
years and years.
Yep, plowing that slow, in low gear barely turns the ground over, doesn't break the furrow slab up at
all, makes a mess when it dries out, hillside full of brick bats. Normally comes from plowing when it's
too wet.