I am new here, glad to find this board as there seems to be a wealth of knowledge pooled here.
I have had my d4 for 3 or 4 years now and still know very little about it other than the last few owners are all local guys. I have written down every number that I can find on it and would like to know all I can about it, mainly year and engine model.
on the left rear tag it reads: serial 40a3290, series c, track type tractor
right rear tag reads: transmission group # 9H5822
Injection pump tag reads : group# 9H3627
Tag on block- left side when seated reads : serial# 40a3430 I think, numbers were hard to read
Cast into the engine block- on right side when seated: 7M-4306, some kind of symbol under that resembling a 9 and E formed together and under that is RMLLU
There is also another tag on the lower part of the engine on the left side when seated that I cannot read
I have been told and assume this is a early to mid 60's model. 24 volt, not pony motor, has the triangle shaped lhydraulic lift arms on the side and has a canopy that looks like a half round and it has a factory tag, but I forgot to get the make and serial off of it.
Any info on this machine is appreciated.

rmllu is a casting date when that mold was made or when that part was cast, this translates into 4/26/61, A tractor could have been built days, months, or even years after the part was cast.

n0
u1
m2
e3
r4
a5
L6
c7
o8
d9

The triangle type hydraulic lift is typically a Cat 4A or 4S blade design.

40A3290 is a 1961 wide gauge unit with factory direct electric start......the number on the block should also match unless the engine has been changed but 40A3430 would be 1961 also.
Both the Cat 4A model 52E1-up angle blade and the 4S model 67E1-up straight blade uses the triangular piece lift mechanism similar to but not the same as the "U" model and earlier D4's

The blade mounted to it is 10' and is 2 way hydraulic with manual angle adjustment. No idea if it is original to the crawler or not.
As for the numbers matching between the engine and the chassis, from what I understand, it is common for the engine to be of a higher # than the chassis because the engines also went for other purposes such as pumps, gensets, etc.
Is this wrong or possible.
I know owner history on it back 15 years or so only, but doubt it has ever left this area. Actually, a relative owned it 3 owners ago.

Without a picture or checking the blade serial number (back upper RH side of the mold board) it sure fits the description of the original style Cat blade as they were the only ones to use that triangular piece.

Separate serial and engine numbers did not start until the 3000 series of engines in the early seventies.

Check the numbers again, you mention them being hard to read. Seems unusual that there would be a different engine number that is so close.

Also forgot to say "Welcome"

Thanks. I will have to recheck the #s, the chassis plate was plain, but the engine plate was rather hard to read. I will also get some pics of it when I can and see if there is a tag on the blade.

I checked the # plates again and what I posted looks to be correct. It does seem strange that if the engine was replaced that it would be that close in serial to the chassis.
I looked on the blad and the tag is missing. Rivets are there from where it once was, but tag is gone.

Anyone happen to know what the fluid capacities are on this thing? I just changed the oil and it seems to have held around 3 1/2 or 4 gallons. I drained the rear sprocket boxes and put 2.5 gallons in 1 and it not full yet. I have to go pick up some meore gear oil. I was guessing it to be about 3 gallons per side from what I drained from them.
I havn't got any pics yet, but will tr to soon.

If you want to know what the blade serial number is, if you sand or scrape the paint away where the tag was originally riveted, you should find the number stamped into the metal. Most have so much paint on it, there is no sign of the numbers until you get through a layer or two. It might be nice to know for sure what the number is, especially if you have to order anything for that part of the machine.

Your engine should be a D330 (4.5" bore x 5.5" stroke) which replaced the
D315 of the same displacement which had been used in D4's from 1948 to 1959.

Thanks, I will have to look at it again and see if anything is stamped into the metal. At least I know where to look because the rivets are still there.

Fluid capacities:

Blade should look like this: