The 9G1 - 9G2875 uses a 2A679 core
The 3T1 - 3T4385 uses a 8B9400 core
I am missing the later 9G and early 7M parts manuals but the 7M5125-7M9999
uses the 8B9400 core. I can't tell when the 8B9400 core came into being but there is a good chance it would be in the late 9G or early 7M models if someone can check it out in the manuals I do not have. Hope that helps.
Answer found.....I had the 7M1 - 7M5124 parts book.
The 8B9400 core was effective with model # 7M3551 so by part number the RD7 core is not a fit.
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
Chapter Fifteen
| Historic Santa Margarita Ranch, 20000 El Camino Real, Santa Margarita, CA 93453, USAChapter Thirty
| Hartley - South AustraliaChapter Two
| Newby Hall, Ripon, Noth Yorkshire, HG4 5AJChapter Two
| Freshfield Farm, Sloop Lane, Scaynes Hill RH17 7NP UK
Antique Caterpillar
Machinery Owners Club
1115 Madison St NE # 1117
Salem, OR 97301
Terms & Privacy
Website developed by
AdCo
"I also joined a year ago. had been on here a couple of times as a non-member and found the info very helpful so I got a one year subscription (not very expensive at all) to try it out. I really like all the resources on here so I just got a three year. I think its a very small price for what you can get out of this site."
-Jason N