Morning guys, 
Just chasing some info if anyone can help. I have a D2 serial number 3J5778, It's a bit of a Hybrid as it has a 6J325 chassis power train attached to it so it's a R2D2 set up. I am just starting a bit of a restoration on the machine starting with the pony motor and starting pinon clutch as these are the first two things that don't work. I was just in the technical library looking at the parts manual and found that the doc under the 3J5001 and up are actually for a 5J serial number. Is there anyway or anywhere that i can find the correct 3J5778 parts manual as I believe that the 5J runs the D311 engine. 

The 5J does not use a D311.

Thanks Rome, 
My mistake it's the U series that use the D311 engine. had my wire crossed. 

5j uses a D4300

Thanks John

Hello , the part manual for the 5j will be ok for the engine and pony motor  , 
,engine is D3400 
6J parts book for the tractor  - catpublications.com/en-US/Search/TokenSearch
ENGINE SERIVE MANUALS www.jensales.com/categories/caterpillar/d2.html
 

Thats I what I meant to type in, lol 3400

Thanks guys for your help