Considering a D4D

Hi, Dead Axle.
Wouldn't touch it with a barge pole. TERRIBLE contraptions.

Seriously and just in my humble opinion, pound for pound, the Cat D4 series, with the possible exception of the D4C, is one of the best crawler tractor lines that God ever let anybody burn diesel fuel in. About as close to bulletproof as a small crawler can be.

Just my 0.02.

why is the D4C a problem tractor?

I bought one from your neck of the woods ( Eugene ) mine is a 66' has wet clutch but dry brakes, not sure when they went to a wet deck but if you plan on lots of hours it would be something to consider. Doesn't really matter for me as it will only see limited use.

If it's a ex logging tractor check the frame rail flanges for cracks where they attach/bolt to the steering clutch housing. I'm not aware of cross shaft support issues but then a gypo logger can tear up most anything.

Hi, Bursitis.
Around my neck of the woods, they developed a bit of a reputation for over-heating in heavy work and the 'World-renowned' buzz bomb pony motor didn't win them many friends either. There were a good number of them for sale secondhand at the the dealers shortly after the D4D came out.

Just my 0.02.

Factory direct start , still going strong since 1962 , main thing to look out for is where the saddle bolts to the block for the equaliser spring as it can break out the bolt holes , i also have a D4D7R that has just had an engine transplant and should be up and running soon

Are those outboard mounted carrier rollers an LGP thing or a common conversion over in Europe?

i think it was a change of design as i have seen them on standard track too , not just lgp ?

Thank you all for your input, pictures and advice.