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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D7 serial number

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John Henderson

07-29-2006 17:36:00




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I tried the serial number link on this site. It narrowed down to post 1940. I would like to narrow it a little closer. Looking for suggestions. Serial Number 3FT636. Thank you.




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Billy NY

07-31-2006 04:24:03




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 Re: D7 serial number in reply to John Henderson, 07-29-2006 17:36:00  
Stamped serial number tags are in 2 places, on the back as Doug describes, above the final drive filler cap ( recessed hex shaped threaded cap ) up on a flat area and also on the rear left of the engine block looking as you sit in the seat, the starting engine may obscure it as well as the cable control or winch on the back, if the tags are missing, the number will be stamped into the metal behind where the tag was, may have to carefully expose the numbers.

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John Henderson

07-30-2006 06:05:53




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 Re: D7 serial number in reply to John Henderson, 07-29-2006 17:36:00  
I got this number off the spec plate on the right outside side of the of he operators platform. it was the bottom numder with no designation as what it was for. I will have to check to see if I copied it down wrong next time I go over to the farm. Is there somewhere else I should be looking for the serial number on the dozer? Thanks for your replies



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Doug in IL

07-30-2006 06:35:32




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 Re: D7 serial number in reply to John Henderson, 07-30-2006 06:05:53  
Look at the rear of the tractor on the main case. There should be a plate with the tractor number.



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john Henderson

07-30-2006 15:09:25




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 Re: D7 serial number in reply to Doug in IL, 07-30-2006 06:35:32  
Not knowing much about the dozer would the rear of the case you mention be the area back where the winch and pulleys for the cables are mounted behind fuel tank? I was in high school when My grand father and I were fooling with it. I knew nothing about them and he didn't know alot about Caterpillar crawlers either



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john Henderson

07-31-2006 17:33:36




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 Re: D7 serial number in reply to john Henderson, 07-30-2006 15:09:25  
The fuel tank seems to be part of the seat platform with the tank fill and tank being behind the operators position. the pulleys/winch are mounted behind the fuel tank. I proably will get over there this weekend to see if that number is visible. The numbers i have were on data plate on right side of seat platform. Had width, length, weight, cubic capacity



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Billy NY

07-31-2006 19:00:17




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 Re: D7 serial number in reply to john Henderson, 07-31-2006 17:33:36  
If that data plate was raised letters and gives the size information as you mentioned, it's most likely a former military tractor, I have one with the plate you describe in the same location and another with a brass army corps of engineers tag on the firewall behind the air cleaner, a different kind of tag. This embossed tag is put on for military information, and is not the serial number tag placed by the manufacturer.

Yours is may be a 7M, 3T, 4T, or 6T model of a D7, they even made an armored 1T in limited quantities, and in all, there were about 50,000 manufactured, these are practically identical, only differences being subtle upgrades, that parts catalogs will only reveal by serial number and higher gear ratios in the transmissions for ones obtained under government purchase order, like 4T's and 6T's (which only 1000 6T's were built for the navy). I'm thinking you may have an early 3T, the government needed all these they could get for the war effort back then, so they even bought some 3T's which were for sale to the public, and even although they had already bought 10,000 7M's and 10,000 4T's the next series up from 7M, both an exclusive government order, painted O.D. green at the factory. Later after the war, a lot of these were surplus, some stayed in assigned units and became surplused later, there are still many of these in other countries, and quite a few dumped into the ocean, government was not too bright for doing that.

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jJohn Henderson

08-04-2006 16:08:40




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 Re: D7 serial number in reply to Billy NY, 07-31-2006 19:00:17  
Thank you for the addtional info. I will try to ge over to check the rear area for another plate and see how the numbers come up.. Billy NY you mention ratios My grandfather said he'd never seen a bulldozer go as fast I put it in third and pulled the throttle wide open, natural ingnorance on my part. was fun though.



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Billy NY

08-04-2006 18:16:34




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 Re: D7 serial number in reply to jJohn Henderson, 08-04-2006 16:08:40  
Wait til you try 5th, I don't know what 5th was for, more for drawbar work like pulling tillage equipment or a towed cable operated scraper, they are kind of fast. These are durable old machines, little complicated to work on some of the innards.



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John Henderson

08-06-2006 13:56:01




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 Re: D7 serial number in reply to Billy NY, 08-04-2006 18:16:34  
Didn't know it had 5th gear or perhaps my memory is faulty it's been 25 years or more. didn't find a plate on back of crawler. did find a alumimun plate which was covering a stamped number but this plate was mounted on the side of the cable housing/winch assembly not the rear. the aluminum plate was unreadable. rechecked the plate on right side of the operators platform. i did have one incorrect. That number appears to be 3f7636 or 3f1636 since this matches none of the info provided it's still no help.

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Billy NY

08-07-2006 06:18:26




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 Re: D7 serial number in reply to John Henderson, 08-06-2006 13:56:01  
1-5 foward, 1-4 in reverse and of course the forward and reverse lever.

That was probably the tag for the power control unit PCU if a LeTourneau model or cable control unit CCU if a CAT numbered series model.

If you look up around the back side of the starting engine, you should see a caterpillar tractor company tag, probably aluminum, brass ones were earlier, as well as just above the final drive case 2-3 above the ground, I can read mine with the PCU unit on, maybe not so with a CCU, does your cable unit have square or round sheave blocks on top ? ( assuming it's not a towing winch, which these are not, just meant for the blade ) The big drum on a towing winch would obscure the tag most likely. Even if the tractor number tags are both missing, the same number will be stamped under where it was, just have to take care to expose the number if there is a lot of paint or grease, hopefully no rust, the front tag can be different if the motor was ever replaced, which is not all that common but does turn up sometimes. Some of the manuals show locations of tags, if time permits I coud scan it and e-mail it to you, my address is open, e-mail me your address asking for this information, I'll see if I can dig it up in one of my books or annotate a photo, take a photo of mine etc.

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Doug in IL

07-30-2006 19:20:10




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 Re: D7 serial number in reply to john Henderson, 07-30-2006 15:09:25  
Yes, on the back of the tractor. Does this tractor have a side mounted fuel tank or is it like a part of the seat? Sometimes those add on components like winches etc. will cover up the serial number plate.



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Billy NY

07-29-2006 21:06:52




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 Re: D7 serial number in reply to John Henderson, 07-29-2006 17:36:00  
If the F is a typo and it's 3T 636 that would be an early 1944 production model, based on that number they averaged 2500 a year, over 200 a month, could be March 1944. 3T's were produced until 1955 at over 28,000 something produced, later ones had oil clutches thought they started at 26,000 something, have to look at the books for exact numbers.



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Doug in IL

07-29-2006 19:58:18




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 Re: D7 serial number in reply to John Henderson, 07-29-2006 17:36:00  
That's not a D7 serial number. Should only be one letter in the serial number. It could likely be a 3T serial number. Like 3Txxx. If you come up with that type of number, I'll be happy to look it up for you.



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