CAT NO. 12 motor grader 7T 345

Oakfan707

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My brother and I just bought a 7T that hasn't ran in 2 yrs. Replaced the fuel filters and cleaned out the housing. Now having a hard time priming the injection system. Also the starter on the pony motor would bind up here and there so looking for a replacement or rebuild kit for that. The edge of the gear on the starter is worn and the gear also isn't returning or disengaging like i would expect it to do. Any help or info would be greatly appreciated as we don't know a whole lot about this thing and everything has been learning on the fly hahaha. But the pony motor will fire up and run so thats a plus

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Wed, Dec 8, 2021 6:57 AM

Fat Dan

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Thanks for joining.
A 7T sweet ... have any pictures?
First I'd start by getting yourself a few manuals i.e. Parts Book ... Operation & Maintenance manual ... Service Manual... ask around here or ebay. I do believe ACMOC has some information on the 7T in the Tech liberty.

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Wed, Dec 8, 2021 8:52 PM

bursitis

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Reply to Fat Dan:

Thanks for joining.
A 7T sweet ... have any pictures?
First I'd start by getting yourself a few manuals i.e. Parts Book ... Operation & Maintenance manual ... Service Manual... ask around here or ebay. I do believe ACMOC has some information on the 7T in the Tech liberty.

until you get the pony starter sorted out you can start it with a rope. get the pony running and spinning the big engine open the bleed on top of the tower until fuel comes out of the drain tube. then with the throttle open you can bleed the fuel pumps from the bleed valve on each pump on the backside of each pump. also can crack the injection line at the injector. do all of this with the compression released though.

D46U straight blade,D46U cat angle blade,allis chalmers AD4 grader and Khoering 404 dragline. D4C 40A,D4 2T and scraper.

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Wed, Dec 8, 2021 9:12 PM

Fat Dan

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Hope this helps

[attachment=65683]Image1.jpg[/attachment]
[attachment=65684]Image3.jpg[/attachment]

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Wed, Dec 8, 2021 9:13 PM

Oakfan707

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Reply to Fat Dan:

Hope this helps

[attachment=65683]Image1.jpg[/attachment]
[attachment=65684]Image3.jpg[/attachment]

Thanks a lot for all the help i really appreciate it. And if anyone has any info period about this beast I'd love to hear it. Love working on old equipment. Also have a CAT 22 thats my next project once i get this main engine running

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Thu, Dec 9, 2021 1:52 AM

Fat Dan

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Reply to Oakfan707:

Thanks a lot for all the help i really appreciate it. And if anyone has any info period about this beast I'd love to hear it. Love working on old equipment. Also have a CAT 22 thats my next project once i get this main engine running

[quote="Oakfan707 post=233736 "]if anyone has any info period about this beast I'd love to hear it.
[/quote]
Old Magnet should be around soon ... I don't know how he dose it or what book he has but he is good at letting people know the year of Caterpillars they have by the S/N .
I can only guess; an early 7T with the S/N of 345 was most likely a first year production model which started in 1945. However, Old Magnet will be able to confirm or update the year and can lock down whether it be an early or late model year production.
good luck

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Thu, Dec 9, 2021 9:19 AM

Oakfan707

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Reply to Fat Dan:

Thanks for joining.
A 7T sweet ... have any pictures?
First I'd start by getting yourself a few manuals i.e. Parts Book ... Operation & Maintenance manual ... Service Manual... ask around here or ebay. I do believe ACMOC has some information on the 7T in the Tech liberty.

I tried to upload some pics but all the ones i have are too many MB's I'll see if i can take some more that will be under the 4MB limit to post

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Thu, Dec 9, 2021 10:02 AM

Old Magnet

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Reply to Oakfan707:

I tried to upload some pics but all the ones i have are too many MB's I'll see if i can take some more that will be under the 4MB limit to post

7T 1945 production was 7T1 to 7T1006

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Thu, Dec 9, 2021 10:14 AM

CAT NO. 12 motor grader 7T 345

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