Any CAT Dozer fanatics? Model ??'s

[Mog]

The old Dressers are not diff. steer but they accomplish the same sort of thing by keeping power to both tracks. I don't know how to explain diff. steering except that a hydraulic motor turns one of the sets of planetaries in the differintial housing a different speed when you want to turn. maybe someone can come up with some pictures or explain it better.

 

[illflem]

The old International TDs just had two speeds in the clutch levers rather than the modern differential steering where the speed control is variable. I had a TD-24 and a D-7 at the same time, aways chose the 24 over the 7 when I had a choice. The TD could out push the D-7 any day especially when cutting a road up hill because of the power while turning.



The Case 850 just has regular clutches, no power to one track on a turn.

 

[me4osu]

Just one note of caution. If you get a high-sprocket dozer, and do your own pad and rail work: Only break one track at a time. Once both tracks clear the sprockets: No brakes.



I liked the D6Ds, but (like dshockley said) the final drive took forever to repair.



Weren't the older 6s powered by D342-TAs rather than D3306-TAs?

 

[Blakers]

Almost all Cletracs had Controlled Differential Steering - they invented it! Some of the later ones had spot turn where one track would stop altogether. A few had counter-rotating tracks.



Just so the Cat guys don't start claiming they invented the high sprocket crawler, see the Cletrac F pictures on my Cletrac site.



BTW, Cletrac (Cleveland tractor Co) was bigger than Cat until the 1960s.



Blake

 

[rkressg]

Originally posted by me4osu

Just one note of caution. If you get a high-sprocket dozer, and do your own pad and rail work: Only break one track at a time. Once both tracks clear the sprockets: No brakes.



I liked the D6Ds, but (like dshockley said) the final drive took forever to repair.

Yea, but these drives only weigh 3000 lbs

 

[fbaurley]

case 850

I have limited experience on a case 850. If i recall correctly if you are going straight ahead with both levers in the high or low ( both tracks at the same speed) that the track with the least amount of traction will slip. This would be similiar to an open differential in a vehicle. but when yo go to turn and pull one lever back into low, ithought you still had power to that side, only with half the speed. If you are turning while pushing I would think that the outside track should still slip if you stall it out due to it being in less of a bind, therfore less resistance, kinda like an open diff. ( I always tried to push in a straight line) . please correct me if my theory is wrong.

Thanks

Jon

 

[Will24]

hey blakers



did you ever come down to the Hay Creek Fall festival just outside Morgantown, PA?





always a few VERY NICE cletracs there



-Will

 

[Blakers]

No Will, never been there. What part of the state is that in?



We have a lot of crawlers and other construction equipment at our show in Saegertown, Pa - Pioneer Steam & Gas Engine Society - they even have their own sandbox to play in. About 6 acres worth! We may host the Historical Construction Equipment Association in a couple years.



Our show is in the 3rd weekend in July.



Blake

 

[Will24]

Morgantown is about 5 miles south of Reading in Southeastern PA



We have an annual fall festival that is half "technology through the years" which is a tractor show that has everything from the 1860s to the 1970s and assorted other equipment, including early american cars. The other half is arts/crafts etc plus a LOT of demonstrations



it's pretty cool, esp. if you wanted to make a weekend out of it





-Will

 

[Blakers]

I'll have to check it out sometime. Thanks

 

[rbattelle]

Check these out:

Komatsu 575s for sale!

Specifications.

Komatsu 575 series - quite a bit larger and more powerful than a D11R!

If I won the lottery, stuff like that is what I'd buy.

Here's one next to a D11!

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Ryan