I just saw a D6C series G sn 10K849 Cat listed on a auction site. I am wondering what year it would be and how strong compared to a 1959 D7 17a
not turbo charged?

D.K. in S.K.

The 10K went in production in 1967 so that one could have been made that year yet or the next.Probably at the end of a days work the D6C with power shift trans. would do as much or more than the larger D7 but the D6 would be so much faster.

Thanks for the reply SJ. So as I understand it on a side by side push the D7 17a would out push the D6C but the D6C being faster would make more passes per hour. Thus move as much or more in the same number of hours.
Since most of the work I would be doing is done on frozen ground which one would have more traction. This is for my winter pleasure, clearing bush. I prefer doing it in winter since that way I do not even disturb the grass and move no topsoil.

D.K. in S.K.

Manx Cat, my book says the D6 10K849 was built in 1969 and the engine was rated at 140 FHP and the D7 17A was also rated at 170 FWP. Hope this helps
Regards.

Flywheel HP of the N/A D7 17A (D7C) is 128 .. drawbar HP is 102.

There is a world of operating difference between the two tractors.
The D7 is a Direct Drive 1200 RPM lugger, that pulls back to 800RPM under maximum load .. and relies on the torque rise of that massive long stroke engine to achieve stump-pulling power at around 1MPH or less ..

The D6C is a 2000 RPM high speed diesel that relies on a torque converter to multiply its torque with minimal engine speed drop.
The D6C has 140 engine HP .. is faster and more responsive, more nimble, and heavier overall, than the D7.
There is no way to do an exact comparison between the two tractors .. but the D6C will do everything the D7 will do .. and do it faster .. is more operator-friendly .. and is more reliable in the long-term.

Manx Kat
I think you need to compare apples to apples.
The D7 has the old lower speed engine with no turbo, with a direct drive transmission and either cable or the old slow hydr. set up the Cat used. Good old tractor but when you are pushing and hit a hard spot, you will need to shift or lose part of the load. The direct drive transmission is slow to shift and slow backing up. If its cable how are you going to put down pressure to get it in the ground. Would be a lot better if it had a turbo. But they are great to pull an old scraper.
The D6C will have a higher speed D333 engine. with a torque converter and power shift transmission. It will more than likely have hyr. on the blade. The a torque converter will stall and do as the name says torque you threw a hard spot, the motor will hardly lose any speed or power. If that fails with the power shift transmission you can shift on the go if you need. you can shift up as much as the engine/ torque converter will push. Backing up Throw it in third reverse and hang on. so much quicker than the old D7 17A it is not funny.
Parts are so much cheaper and more available for the D6C
I have owned both and the D6C will keep up and out do the D7 17a with no problem, even in hard frozen ground
To bad the D6C does not have a turbo, You can add one if you want to.
Ron

Sorry Oz Dozer did not see your post until I hit Submit reply.
I think I just repeated and added some to your post
Ron

Thanks again for the good info. I very much appreciate all I can get since I am allmost deaf the only way I can really get info. is to read.
Yes I realize these are very different machines. I had a D7 17a with a hyd blade. I have never figured out why any one woud want one of those cable blades I never ran one but never saw a decent job done by one either. So that is my reason for using it as a comparison. Speed is not that important to me since I will only use my cat for my own use. I would expect to put about 200 hours on it over the next 3 winters and then just keep it as a hobby (toy ) and run it once in a while. Not make a business of it. I have probably 2000 hours cat running experience mostly clearing bush. I felt the D7 was the smallest cat suitable for the work I want to do. Thus wondered if the newer D6 would push as much.

D.K. in S.K.

Well I would compare it like the diff. between driving grandpas 53 chev p/u to driving your wifes caddy.LOL Much better steering system,powershit,much less noise,decelerator for doing fine work and easing into load . unless you doing someting like ripping where you need a constant hard pull allday the 10K will do 3 times the work in a day as 17A may not have the HP but with its speed, user friendy controls and plain comfort you will get much more done and not be plumb wore out at end of day. But with all that it is much more complicated to work on and many more things to go wrong

I am always interested in the 6C - 17A comparison.

The D7D is my dream tractor. I figure it is one that I may run into and possibly be able to afford someday. Sure a D6C will do the same work easier and faster but it all comes down to dollars and cents for me. A D6C in good working condition is going to cost about $25,000. A 17A in good shape can be had for a lot less. If that powershift transmission goes out it is going to cost $15,000 but even this is not bad if you are working in the real world where they use new Cats.

I want a direct drive tractor even if it is a D6C. I'll even take a cable blade. have some neighbors that bought a 17A for about $5000, they havn't invited me to see it yet. I am hoping to end up with it when they break it or can't start it.

Interesting about brushing when the ground is frozen, that sounds like an excellent method. I have brushing to do at both ranches but it dosn't freeze here. Here on the coast we have the coyote brush, if you don't get all the roots out it will come right back. I would use the old 7U with a brush rake and do it about this time of the year, after the first rains when the ground is soft.

At the ranch in the foothills we have a mountain lilac. I just met with the Rescource Conservation lady and we agreed late spring after the rains end would probably be the best. Last year a neighbor did a lot of clearing in the heat of summer. They had a High Track D6 (H?) with an air conditioned cab.
The lady said they don't recomend this because of fire danger. I don't want to work in the heat and if I get in there before it gets hot the dust won't be too bad. We have the D4 (HT4) loader up there.

Tom