No such thing as stupid questions, but there certainly can be some ridiculous answers. First off, you will never be able to "...have acouple D2's that are the same year what are the main differences between the 3j,5j,4u&5u." 3J and 5J D2's are basically the same machine mechanically with different track spacing (Gauge). They are identical as far as motor and tranmissions are concerned. 3J is a 40" gauge and 5J is a 50" gauge. Both use the D3400 motor. The 4U and 5U are identical again as far as motor and transmission, and again, the only difference is the gauge (again 40" or 50") They use the D311 motor. There is a difference between the early 4U and 5U's VS the "late model" D2s in that the transmission was stretched to allow for a split coupling that facilitates clutch changes without splitting the tractor. There were also sheet metal modification to accomodate the stretched machine. Several parts from late model U's to early model U's will interchange, several will not. You really need to specify what parts you would like to cross reference. The D3400 and the D311 are two completely different motors. You should purchase parts books for the machines you own, whether they be a J or a U model.
Thank you oldparker and B4D2 the info helped me get my mind right for awhile anyway.
Hello there, My dad and me have a couple of D2's as well u and j series. A "39" "45" j series and 2 "52" u's one with a 2s cat blade set up , my favorite and one tail seat. Well back to the subject I know the bell housings are the same, the pony blocks not only on the D2's but also the same on the D4's t's j's and u's and finally the pony clutch is the same for the d2 d4 and d6 up to the u series. That's pretty much all other details I can offer.😊
Hello there, My dad and me have a couple of D2's as well u and j series. A "39" "45" j series and 2 "52" u's one with a 2s cat blade set up , my favorite and one tail seat. Well back to the subject I know the bell housings are the same, the pony blocks not only on the D2's but also the same on the D4's t's j's and u's and finally the pony clutch is the same for the d2 d4 and d6 up to the u series. That's pretty much all other details I can offer.😊
cool ,thanks rd6 that will come in handy for the pony that does need some help. do you happen to have the piston size on the D3400 & D311?
thanks Billy, the D2 Im working on is a 5U 2642 ser.no. year 1949 would say that an early one by the number but not sure. The one im going to look at tomorrow all I know is its a D2 , the guy said it was made in 1949 but didnt have the ser. no. so not sure. Basicly just getting some info so I tell if its worth getting for parts.Ive priced some stuff at the bone yards and there very proud of what they have to offer. do you know where the ser. no. changes are?
cool ,thanks rd6 that will come in handy for the pony that does need some help. do you happen to have the piston size on the D3400 & D311?
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 Two
| Newby Hall, Ripon, Noth Yorkshire, HG4 5AJChapter Two
| Freshfield Farm, Sloop Lane, Scaynes Hill RH17 7NP UKChapter Two
| Avalanche adventure, Welford Rd, Sibbertoft LE16 9UJ, UKChapter Two
| Highacres Farm, Dewey Lane, Brackenfield, Derbyshire DE55 6DB, 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
