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WD--D series-- 100 series

S

sodly

Member
As an AC newbie, would someone mind giving me the Cliff Notes version of the progression of AC tractors from the WD era though the D series and into the 100 series? From my uneducated eye I can see that a lot of the early tractor DNA appears to have carried over for many, many years. It seems like there's a lot of WD in a D17, for example. And the later 170 also looks like a D17 with different sheet metal. Am I on the right track here? Can someone point out what replaced/superseded what?

Also, of the D series, which are considered the best? Are there any to avoid? Were the diesels better than the gas burners? I see the diesel D17 was a 6 cylinder whereas the diesel 170 was a 4 cylinder, correct?

Same question on the 100 series. Which were the "better" ones and which were "not their best effort"? And which engines were better? What was the smallest tractor in this series to offer a 6 cylinder diesel? Which offered a console Power Director?
 
Don't have that much time. The WD turned into the WD45. The B-C-CA turned into the D10/D12. The D14 was way beyond the CA, but that's where it came from too. The WD45 morphed into the D-17 kind of. The D17 was all new in the middle section with a new generation engine but the trans and rear end were WD45 inside. The 170 came from the D17. The D19 came from the D17 with straight rear axles and bigger engine in front. The 190 came from the D19. Times up.
 

Ha ha! Thanks, Dr. Allis, for the thumbnail version. Anyone else care to go into more detail?
 
The 190 was a revamped D19 chassis with a higher deck and rear mounted fuel tank with a brand new engine and the Power Director clutch was now self-adjusting and hydraulic applied. The 190XT was the same tractor with a turbo and that was a bad idea for the transmission and rear end. The 200 could have been called a 190XT series four. The 190/200 tractor is still one of the nicest tractors to operate with the controls on the right and a high deck flat platform with suspended clutch/brake pedals and tilt steering wheel. Many other brands tried to copy these features. The 180 was 100% a 190 inside with the brakes & final drives similar to a 170 located outboard. The 185 was a series two 180 with 10 more HP. The optional PTO clutch allowed you to engage the PTO on the roll without stopping, which was a nice feature, but the PTO still went dead if you pushed in on the foot clutch. This PTO clutch was only on 180 thru the 200. The 170 was still like a D17.
 
The 190 was also the start of a new hydraulic system that had a triple gear pump. This continued on in all the other models too. One pump for steering/Power Director clutch. One pump for lift/lower. One pump for Traction Booster system. If you ran a 4020 Deere (other than the steering) you'd like the 190 hydraulics much better, especially at half throttle.
 
(quoted from post at 06:42:35 01/12/19) The 190 was a revamped D19 chassis with a higher deck and rear mounted fuel tank with a brand new engine and the Power Director clutch was now self-adjusting and hydraulic applied. The 190XT was the same tractor with a turbo and that was a bad idea for the transmission and rear end. The 200 could have been called a 190XT series four. The 190/200 tractor is still one of the nicest tractors to operate with the controls on the right and a high deck flat platform with suspended clutch/brake pedals and tilt steering wheel. Many other brands tried to copy these features. The 180 was 100% a 190 inside with the brakes & final drives similar to a 170 located outboard. The 185 was a series two 180 with 10 more HP. The optional PTO clutch allowed you to engage the PTO on the roll without stopping, which was a nice feature, but the PTO still went dead if you pushed in on the foot clutch. This PTO clutch was only on 180 thru the 200. The 170 was still like a D17.
Click to expand...

Thanks, Dr Allis! So it sounds like AC never did make a (under 100 hp) tractor in that era with a PTO that was independent of the foot clutch. I'm surprised. Kinda hard to believe, frankly.
 
I have a PTO system kit designed for any of those tractors that would utilize the "free-play" of the clutch pedal stroke to activate a valve that would release the Power Director clutch. All one would have to do is depress the clutch pedal down to the point of the throwout bearing touching the clutch fingers and the tractors motion would be stopped. I might build one this Winter for my Brothers 185 which he does some brush cutting with. My dump valve would be located inside the battery box with linkage from the clutch pedal attaching to it and hoses for the Power Director system coming to and from the same battery box area. It would operate much like a 2-stage clutch on an old Ford or MF tractor. My system would be easier to know when far enough down is far enough down on the clutch pedal.
 
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