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Rank: Advanced Member
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This is not my picture, but i was scrolling through the forums on heavyequipmentforums.com and found a picture of this dozer and i was wondering what this setup is and for what. 
Do it in The DirtCATERPILLAR2000 F-250 7.3 Diesel CCSB 8in lift, 37" Toyo M/Ts
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Rank: Advanced Member
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It lloks like tailing dozer for the oil sands up in canada Jason
NIkl Scale Models
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Ya, it looks like it found a soft spot. Greasemonkey can tell you all about it when he comes along.
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Swamper. Swamp buggy. Swamp Donkey. Or cell Dozers. Did a re-build on a fresh one a few year back.  Just Horrible things.
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what exactly are theyused for?
Do it in The Dirt
CATERPILLAR
2000 F-250 7.3 Diesel CCSB 8in lift, 37" Toyo M/Ts
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Rank: Advanced Member
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greasemonkey can tell it better...but the tailings from the separation of the oil from the sand up in Canada is pumped out to a tailings area...Kind of like they renourish beaches in North carolina...this machine pushes the sand to level it...occasionally it falls into a quick sand area and sinks...that is what happened to this one I believe...it has a trapdoor on the top along with all those radiators...operator escapes out the top and someone has to fish it out...takes lots of money to rebuild....correct me if I am wrong forum...Bob
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Once again not my photos but off heavyequipmentforums.com but deff. stuck here are a couple more.  
Do it in The DirtCATERPILLAR2000 F-250 7.3 Diesel CCSB 8in lift, 37" Toyo M/Ts
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Rank: Advanced Member
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Greasemonkey.. if you see this i would just like to know more about this and what exactly they are pushing around. everyone is saying your the one to ask.
Do it in The Dirt
CATERPILLAR
2000 F-250 7.3 Diesel CCSB 8in lift, 37" Toyo M/Ts
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Ahhhh, that brings back memories.
OK, a basic rundown from the top. Those are cell cats, they are a standard D7R LGP that is heavily modified by the dealer into what you see there. Some of the mods include major undercarriage work which raises the machine by around a foot to give more ground clearance as well as reshaping the angles at both ends of the bottom of the track frames.
They also move the rads to the roof to keep them out of the mud that these machines live in. That causes other issues, but at least the rads don't plug right off and corrode right out like they do if they are in the slop.
They do all sorts of mods to the machines, and in the end they are better suited to the work they do.
The machines are used to build and maintain the dykes in the tailings cells, as well as distribute and track pack the tailings sand. Basically, the sand/silt/water slurry that is left after the bitumen is separated, is pumped to the disposal areas where it is poured into a cell made up of sand dykes to contain the slurry. The slurry settles and some is lost to the pond through a spill box as the water drains. The slurry is worked with the dozers to settle into a more usable surface, that is almost solid, but not quite. There are water lenses that form under the sand sometimes, and they are exaggerated by pockets of MFT that are caught under the sand sometimes. Most MFT runs off with the water and settle in the bottom of the water storage areas of the tailings ponds. The material captured by the tailings cells is mostly the coarse sand from the separation process. MFT is mature fine tailings, which is basically the fine silt and clay that will not settle out, and remains in suspension for many, many years. MFT is pumped back from the ponds and mixed with the coarse sand and gypsum, where the hot water from the process causes the gypsum to set up and create a material called composite tailings that can be buried under the coarse sand to dispose of it.
In the case of the dozers shown here, the composite tails deposit was not yet covered when the two dozers strayed into the area by mistake. The first dozer was stuck and sinking, when the second dozer (with an inexperienced operator) tried to go in and help also becoming stuck. The correct thing to do would have been to stay back and call for help. That would have saved one dozer from destruction. Both of those dozers had to be stripped down and completely rebuilt by the dealer, and neither has run right ever since.
I'm not sure what else you might want to know, but feel free to ask, and I'll try and answer.
Brian
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Trhat pretty muchs sums everything up that i wanted to know thank you very much for all the information.
Do it in The Dirt
CATERPILLAR
2000 F-250 7.3 Diesel CCSB 8in lift, 37" Toyo M/Ts
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I have never understood the logic some people have when it comes to a stuck dozer. Why take another dozer right out to where the first one is stuck?????? I have seen it way too many times where the second dozer is stuck right alongside the first. It seems to me the second operator would be able to learn from the first that the ground is too soft for a dozer, and stay back to work with a cable, or bring an excavator, or something besides taking the second dozer right to the same place the first one is stuck at.
Jerry
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how much money are we talking to have one of those completely rebuilt after it sinks like that? and how often do these dozers sink like that?
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jdofmemi wrote:I have never understood the logic some people have when it comes to a stuck dozer. Why take another dozer right out to where the first one is stuck?????? I have seen it way too many times where the second dozer is stuck right alongside the first. It seems to me the second operator would be able to learn from the first that the ground is too soft for a dozer, and stay back to work with a cable, or bring an excavator, or something besides taking the second dozer right to the same place the first one is stuck at. You see, if you fill in the soft spot with solid, sturdy dozers, then you will have eliminated the soft spot. Isn't it obvious? 
- Andy
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apm2754 wrote:jdofmemi wrote:I have never understood the logic some people have when it comes to a stuck dozer. Why take another dozer right out to where the first one is stuck?????? I have seen it way too many times where the second dozer is stuck right alongside the first. It seems to me the second operator would be able to learn from the first that the ground is too soft for a dozer, and stay back to work with a cable, or bring an excavator, or something besides taking the second dozer right to the same place the first one is stuck at. You see, if you fill in the soft spot with solid, sturdy dozers, then you will have eliminated the soft spot. Isn't it obvious? Clearly! haha
Jimmy Don't take life too seriously, you'll never get out alive!
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Yeah i was also wondering how much that would cost. i cant imagine it would be cheap.
Do it in The Dirt
CATERPILLAR
2000 F-250 7.3 Diesel CCSB 8in lift, 37" Toyo M/Ts
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The inexperienced operator tried to do what is normally done to get an operator off the machine, that is, work your way in to it and allow them to climb aboard your dozer. Typically, you track pack behind the stuck machine, and then back up tight so that you can hook up the winch to the tow cable. Then you winch the back of the other machine up and both work together to get out. That's what you normally do, since the typical stuck dozer is only down due to a water lens, and the track packing squeezes the water out and gives you stable ground to work off of. He didn't realise that in this case, the ground would not become more solid, as it was on an MFT deposit. Therefore, he was unaware that he was heading into a trap beside the other machine. In a case like this, the only way to get the first dozer out was to build a slid road with imported material, then pull it out. In this case in particular, that wouldn't even have worked, since the machine kept sinking.
Rebuild costs for these were somewhere around $350,000 for the one, and $500,000 for the other.
Brian
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I too have wondered about the tailings terminology. Thank you for the explanations and descriptions Brian.
Jon
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