RD7 - D7 serial # break Point??

If you can find casting number on top of the top radiator tank, that will tell if tank said RD7 or Caterpillar. A very early part book indicated that tank changed from RD7 to Caterpillar at 9G2777. With the caterpillar top tank, the radiator sides would have had initially a Brass plate RD7, later was replaced by a pressed steel plate with D7. I have never known when the steel tag was started.
The significance of the part book break at 9G2875 was the change from large flange injection pumps to the later forged body small pumps. Cat did not appear to pay much attention to when they changed from RD model designation to D. Later parts books make everything cloud, as they treated RDs as D.
SP could mean many things, different finals, transmissions, pony motor two speed transmission, and many other thing. Cat was the only one that would have know what it met, and that info is LONG gone.     Pictures are my 9G2614W.

Brian: I know I am being a bit inquisitive, just curious as to how many tractors you own? You can share if you like, if not, I understand! Thank you, JM.

Sorry I cannot count that high.

[quote="brian18a post=261153 userid=689"]Sorry I cannot count that high.
***Great answer Mr. McCloud!***JM
 [/quote]

If you can find casting number on top of the top radiator tank, that will tell if tank said RD7 or Caterpillar. A very early part book indicated that tank changed from RD7 to Caterpillar at 9G2777. With the caterpillar top tank, the radiator sides would have had initially a Brass plate RD7, later was replaced by a pressed steel plate with D7. I have never known when the steel tag was started.
The significance of the part book break at 9G2875 was the change from large flange injection pumps to the later forged body small pumps. Cat did not appear to pay much attention to when they changed from RD model designation to D. Later parts books make everything cloud, as they treated RDs as D.
SP could mean many things, different finals, transmissions, pony motor two speed transmission, and many other thing. Cat was the only one that would have know what it met, and that info is LONG gone.     Pictures are my 9G2614W.

thats an interesting hydraulic system on the back. never seen that one yet? ive got a 9g as well i always assumed mine as an rd-7 since that is what the radiator showed. now im gonna have to check my serial number again lol!

My 9G7101 has D7 on the seat & D7 on the rad top tank. The top tank looks nearly like there was a R before the D but maybe they took the R out of the mould or something?