D6 cat

If it runs and pushes dirt, grab it up for that price. The pony engine on a D-6 is made for that series only and it's equivalent which would be an older Cat 12 grader or a stationary power unit. Parts are readily available. Look on the left side of the diesel engine under the pony engine and check to see if there is a cover plate with three studs. That would be where the electric starter would bolt up if you decided to go direct start.

Factory direct electric start option became available in 1955.
Earlier models require boring the flywheel housing.

Hi, TnMike.
Looks pretty good from 10,000-plus miles away. If you can locate the serial #s, they will tell more accurately the build year of the machine. If engine and tractor serial #s match, you have the original engine. Serial #s can be found on the left rear of the steering clutch case, just above and a little inboard of the top of the drawbar swing frame mount and on the left side rear of the engine, just above the starter pinion housing aft of the pony motor.

Does this photo look better?

[attachment=48303]Cat D6 U series with hyd dozer_1_Acmoc.jpg[/attachment]

That issue with photos turning themselves around upon uploading apparently only affects photos taken with some phones and has to do with how the phone is held when taking the photo.

Just my 0.02.

I remember seeing a plate where you engage the pony motor with a lever on the left side below the pony motor. I don't have a picture.
Could that be it? How do you date the dozer?

From what the owner said the pony motor runs, it just knocks bad and he stopped trying to use it.

Hi TnMike.
The serial # plates are small rectangular aluminum plates rivetted to the engine block and the rear left of the steering clutch case. If either plate is missing, the serial # was also stamped into the parent metal underneath. Yours should start of with either 8U or 9U and have four or five numbers following. It may also have 1, 2 or more letters after the numbers if it had any special equipment installed at the factory. The most commonly used letters were SP for Special Parts.

Hope this helps.

Just my 0.02.

Here are a couple more pics.[attachment=48304]KIMG0197.jpg[/attachment][attachment=48305]KIMG0193.jpg[/attachment]

For $1500 delivered, even my wife would let that sit in our lawn!
Like said by others, Pony parts are available.
Get some sort of starting system that is reliable for it.
One day you will stall it and it won't be on a hill!

[attachment=48306]Cat D6 U series with hyd dozer_1A_Acmoc.jpg[/attachment][attachment=48307]Cat D6 U series with hyd dozer_1B_Acmoc.jpg[/attachment]

If you don't want it, for that price, have him deliver it to my place! : )