2-ton carb

What is your tractor S/N? 2 Ton Tractors from S/N 70001 to 70438 used a Kingston carburetor .. tractor S/No's from 700439-up used a Zenith carburetor.

The tractor # is 73355. Is this the S/N?

Yes. The last known 2 Ton S/N is supposed to be 78989, altough I have buddy whose 2 Ton S/N is higher. Your tractor does indeed take a Zenith carburetor, and the model is T5T.
Do you have a parts catalog for the tractor? I can supply you with a professional reproduction of the original "comparative" Cat parts catalog that details and shows all the changes in design, and parts used, between the various S/No's. Email me if you're interested. The copy is fitted with cover protectors, and is ring bound with plastic comb binding, so it lays flat, and it will cost you US$35 post-paid. It's a nice handy book to have, 91 pages, with great drawings, and a numerical parts list included as well. Regards - Ron Nash.

Caterpillarcraig, if your still looking for T5T carb, I have one. Scott

Hi Ian,
welcome to the BB. Love old trucks too. Dad and I restored a 1929 Thornycroft XB tandem drive that we carted our 2 Ton to/from Rallies on.
I have this scan to offer from the 2 Ton Service Manual.
Have 2 Ton Parts Book but Part Numbers are Holt/Caterpillar and so not much use today.
In due course I will scan and post the carb. operation and adjustments from the manual.
On this BB double left clicking on the scan will enlarge it for easier viewing--I also recommend to down load and save these scans for future use.
Hope this helps.
Cheers,
Eddie B.

EDIT,

added scans cover Operation and Adjustment. Last two scans show float fuel levels for various Zenith Carbies--the T5T dimension (45/64") is in the second paragraph of dimensions--second page of dimensions tells how to adjust the fuel level for the collared float level type needles.
Cheers,
Eddie B.

With all the questions about carburetors, folks might want to check this outfit out https://www.robertscarbrepair.com/

" I've never seen a carburetor that weighed two tons!!! Great scott!!!"

I have a friend that views the forum , but is unable to post . He asked me to put these photos up if they can be of help .
[attachment=52742]Holt T-35 Carb1.jpg[/attachment][attachment=52743]Holt T-35 Carb2.jpg[/attachment]