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Cat Dozer D7

PowerShift Vs. Non-Powershift

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Mitch Light

04-24-2003 14:36:40




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To those of you who own dozers with "powershift", what is the main advantage? It seems that the powershifts are very expensive to over-haul, in fact I heard of an owner of a Cat D7F who had the powershift and torque converter over-hauled by a Cat dealer and the cost was like $25,000.00 whichs is getting close to what the machine is worth. On an older Cat wouldn't it be less risky to get a non-powershift machine? Seems like a non-powershift would be much less costly to over-haul. A powershift would be easier to operate, I agree, but I am looking at maintenance costs. Also someone said that for extended "pulling" such as pulling a root plow, the powershift could overheat and was really not designed for extended "pulling". Anyone? Would appreciate hearing from you with pros and cons of the "powershift" in a Cat dozer.

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Wayne

04-24-2003 22:09:57




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 Re: Cat Dozer D7 - PowerShift Vs. Non-Powershift in reply to Mitch Light, 04-24-2003 14:36:40  
I just got finished building a Powershift transmission out of an old D9G CAT dozer. Bob is right about it being an expensive rebuild, especially when you run into one like this where almost everything had to be replaced. Even using aftermarket parts, where possible, the rebuilt is gonna run about $12,000. Then add onto that the cost of rebuilding the torque converter, that was shot also, and it gets even worse. I could have gotten the guy a reman from CAT for $27,000, or a reman from another source for around $9,500. Being an independant mechanic though, I have to stand behind the work I do, and building it myself is the only way to really know what is in it. Like Bob said, having a Powershift is great for back and forth dozing. It has the advantages of the torque, plus the ease of operation when changing direction, and allows you to start in a lower gear and up shift after you get the pile rolling if you want. For continious pulling like you want to do though, you won't beat the old tried and true standard transmission. Good luck.

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Bob/Ont

04-24-2003 14:54:11




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 Re: Cat Dozer D7 - PowerShift Vs. Non-Powershift in reply to Mitch Light, 04-24-2003 14:36:40  
Mitch, the powershift is great for dozing where you have to go back and forth a lot in short cycles, the torque divider also gives you a lot more torgue or pushing force than a flywheel clutch to start a heavy load moving. On a long haul like pulling a farm implement for for a mile or so with out a stop the direct drive would be best. A power shift shouldn't over heat if you can keep the tractor moving, with that much load the direct drive would stall. However heat will be generated and heat is waste energy so the direct drive would be more efficient on long steady pulls. A direct drive trans isn't that cheap to overhaul after a major failure either.
Later Bob

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Alvin Wilkinson

10-11-2003 20:06:22




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 Re: Re: Cat Dozer D7 - PowerShift Vs. Non-Powershi in reply to Bob/Ont, 04-24-2003 14:54:11  
I own a 977L Cat crawler loader.(1972) The torque converter leaks at the output shaft, even after a new oil seal. Can't find any wear in collar are the shaft. Could the scavanger pump be the cause of the problem? Thanks Alvin



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