Cat D4

Hi, Bobby866.
Welkum too ther 4um - and to Cat addiction. The serial # should had oughta be onna samll 'ally-mum-yum' (I'm from DowNunder.) plate rivetted to the top left of the back of the steering clutch case. If the plate has gone AWOL, the serial # should be stamped into the case at the same location. There should be a similar plate rivetted to the left side of the diesel engine block just above the starter pinion clutch.

7J would be a late '30's-early '40's D4. If the serial # just happened to be 7UXXXX(X), that could make it a 1956 build.

I am told that the D4's post side tank era - 7J, 2T, 5T - could still be obtained with the side tank although I never did see one that I can remember. As I understand it, the seat tanks started with the 6U-7U tractors but you could still get the side tank if you wanted it. Or maybe have both for the 'long range option'?

Got enny foters, M8? Please?

Hi, Bobby866.
Welkum too ther 4um - and to Cat addiction. The serial # should had oughta be onna samll 'ally-mum-yum' (I'm from DowNunder.) plate rivetted to the top left of the back of the steering clutch case. If the plate has gone AWOL, the serial # should be stamped into the case at the same location. There should be a similar plate rivetted to the left side of the diesel engine block just above the starter pinion clutch.

7J would be a late '30's-early '40's D4. If the serial # just happened to be 7UXXXX(X), that could make it a 1956 build.

I am told that the D4's post side tank era - 7J, 2T, 5T - could still be obtained with the side tank although I never did see one that I can remember. As I understand it, the seat tanks started with the 6U-7U tractors but you could still get the side tank if you wanted it. Or maybe have both for the 'long range option'?

Got enny foters, M8? Please?

[quote]Deas Plant.

I am told that the D4's post side tank era - 7J, 2T, 5T - could still be obtained with the side tank although I never did see one that I can remember. As I understand it, the seat tanks started with the 6U-7U tractors but you could still get the side tank if you wanted it. Or maybe have both for the 'long range option'?[/quote]

Deas Plant

Effective with Sn’s 6U5843 and 7U11952 the increased capacity seat type tank for the D4’s were installed, although you could still get the fender tank if one wanted. The seat tank were 30 gallons compared to the 25 gallon capacity fender mounted tanks.

For what it worth, the heavy duty fenders, 3/8” thick were installed as standard equipment on all D4 Tractors including those equipped with the fender mounted tanks which has been retained as special equipment to be used with mounted attachments such as the Traxcavators.

Then a few years later (195😎 one could get a new [quote]“seat tank groups, which feature increased fuel capacity, are now available as attachment for D4 and D6 Tractors. The 1M4136 tank group (tank and seat similar to No. 955 Traxcavator) has a 45 gallon capacity fuel tank an is adaptable to D4 Tractors, 6U8800-up and 7U22627-up. The 1M4135 Tank Group (tank and seat similar to No.977 Traxcavator) has 60 gallon capacity fuel tank and is adaptable to D6 Tractrors 8U7902-up and 9U17315-up.

The larger fuel tanks, due to their extended overhang at the rear of the tractor, prohibit use of some tractor-mounted equipment.” CSB 1958 [/quote]

Kelly

the serial number that i have found on my machine is 7U1149WSP not sure if that is the correct serial number is hard to read as its in kind of rough shape

The WSP (for wide gauge/special parts) designation doesn't normally appear on a "U" model. Check again, the "U" is probably a "J" as part of the "7J" designation which yours would be a 1939 model.

yes we weren't sure if it was a j or a u so the j would make a lot more sense then so what would the special parts mean?

when i arrive at home i will post a picture of the cat and the serial number plate

here are some pictures of the cat i purchased looking for more details on it year and stuff like that