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BuckSkin 
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 Topic: D17 "Series" Differences ???
Posted: 21 Mar 2020 at 7:24pm |
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I have searched to no avail.
Considering the "D" models, I am running across various "Series"; I have seen reference to as high as a Series IV in the D17 model.
Is there a pictorial break-down with descriptions showing the various series?
Thanks for reading and all help is appreciated.
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Keith M
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Location: Kentucky
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Posted: 21 Mar 2020 at 9:55pm |
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I have a series 1 or I as it appeared. It’s snap couplerearly diesel. As they made improvements they used a different series number. My brothers series IV is 3 point hitch. I don’t know all the nuisances I’ll leave that to the smarter folks. Just an old mans opinion.
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SteveM C/IL
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Posted: 21 Mar 2020 at 10:19pm |
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There were 4 but the first wasn't designated as such,not sure 2nd version was denoted either but the 3&4 were clearly marked....some one here knows for sure. They have been separated out and called 1,2,3 & 4 series buy people who know the differences. They divide by certain years/changes.
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DrAllis
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Posted: 21 Mar 2020 at 10:26pm |
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The series 3 and 4 are called out by that on the fuel tank decal. They are nearly identical in features and looks with headlites on the fenders, oval muffler, dry air cleaner, and combination band/disc brakes. The real differences come with the hitches, drawbars, and the live hydraulic system on the series 4. 1962 and 1963 are the S-3 models. S-4 was 1964 thru mid 1967.
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BuckSkin
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Posted: 22 Mar 2020 at 1:31am |
 DrAllis wrote:
The series 3 and 4 are called out by that on the fuel tank decal. They are nearly identical in features and looks with headlites on the fenders, oval muffler, dry air cleaner, and combination band/disc brakes. The real differences come with the hitches, drawbars, and the live hydraulic system on the series 4. 1962 and 1963 are the S-3 models. S-4 was 1964 thru mid 1967. |
Does this pretty much hold true for all the D models ? Did all D models have four series ? Thanks.
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DiyDave
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Posted: 22 Mar 2020 at 5:04am |
You have to remember, the D-17 was the most popular, IIRR. It had 4 series because of how many and how long it was on the market. D-10/12 had 3, D-15 had 2, as did the D-21. 
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WF owner
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Posted: 22 Mar 2020 at 5:45am |
BuckSkin wrote:
Does this pretty much hold true for all the D models ?
Did all D models have four series ?
Thanks.
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Not all D models had four series. I believe the D-17 was the only one with four.
I am shooting from the hip on this and anyone can feel free to correct me if I am wrong.
D-10 - 3 series D-12 - 3 series D-14 - only one series D-15 - 2 series D-17 - 4 series D-19 - only one series D-21 2 series (Series I was naturally aspirated, series II were turbocharged)
Again, this is from memory and may be wrong.
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DrAllis
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Posted: 22 Mar 2020 at 9:04am |
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Series 3 and 4 gas tractors also had the belt driven power steering pump located directly above the generator. Any older D-17 gasser that has this style power steering pump, had it installed after the fact.
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Lonn
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Posted: 22 Mar 2020 at 10:16am |
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D17 series I had a narrow drawbar bail vs a wider one on Series II. I think the bull gears got wider at that point too but could be later. Series II got the full molded rubber steering wheel. Grill changed to bar style with Series II but later Series II dropped bars but still different from Series I. I think Series II added grease zerk to front axle pivot in front bolster. Oli filter went to full flow system with Series II. Longer spark plugs and different head and larger round muffler with series II. And as always I could have some things wrong.
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DrAllis
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Posted: 22 Mar 2020 at 10:28am |
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Bull gear/bull pinion gears prior to Series3 were the same as a WD45. At the series 3 and newer models the gear tooth width remained the same, but tooth count was changed from 15/82 to 14/76 teeth. Less teeth allowed the new teeth to be thicker and stronger. This design remained thru the One-Seventy. Model 175-180-185's got much wider gears and an even slower gear ratio of 13/76 teeth.
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DrAllis
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Posted: 22 Mar 2020 at 10:36am |
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In my warped thinking, there were three different series before the Series 3. 1957/58 models with the orange grille, silver hood decals, small WD45 muffler, narrow drawbar, and WD45 steering wheel. The 1959 models with the black grille with horizontal bars, different hood decals, larger diameter muffler, plastic steering wheel that said "power steering" in the center, wider drawbar bail. Then, the 1960/61 models with the new Persian orange #2 paint, riveted on hood emblems, new style grille screen with crème paint, crème wheel centers, etc.
Edited by DrAllis - 22 Mar 2020 at 10:38am
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BuckSkin
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Posted: 22 Mar 2020 at 11:55am |
You guys sure know this stuff; I appreciate all this response. It would seem to me that it would be very important to know your serial number when going to the parts counter.
DrAllis wrote:
Series 3 and 4 gas tractors also had the belt driven power steering pump located directly above the generator. Any older D-17 gasser that has this style power steering pump, had it installed after the fact. |
Your comment reminded me that I have pictures of a 1939 A-C "B" that has a belt-driven 1970s GM power-steering pump that powers a home-made 3-point hitch. I would not have thought such a pump would have been sufficient for such a task.
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