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Cat D3 79U trans, and hydraulic oil.

Cat D3 79U trans, and hydraulic oil.

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Dandy Dave
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What is the correct oil for a cat D-3 79U series transmission,it is power shift unit. Also what is the correct oil for the hydraulic system. Did a lot of older Cat tractors in the past but this is a different animal than a D2 5U, or a D4 6U. Thanks, Dandy Dave!
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Sat, Jul 31, 2010 9:25 AM
Gavin84w
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Cat TDTO 30 for the trans and 10W for the hydraulics as long as you are in a climate with fairly regualr temps beetween say 0c & 35c.
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Sat, Jul 31, 2010 5:48 PM
Dandy Dave
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Reply to Gavin84w:
Cat TDTO 30 for the trans and 10W for the hydraulics as long as you are in a climate with fairly regualr temps beetween say 0c & 35c.
Thanks Again. I've pulled a lot of wrenches on old stuff, but I have never worked on a modern D-3. Thinking about it, it should be old enough to be in a museum now being that these tractors are pushing 40. The fellows that have it, handed it to me in a bushel basket with the transmission apart. Almost back together now. The service book does not list the oils. As I remember, cat always used that in the operators book which we do not have yet. Dandy Dave!
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Sat, Jul 31, 2010 6:51 PM
dpendzic
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Reply to Dandy Dave:
Thanks Again. I've pulled a lot of wrenches on old stuff, but I have never worked on a modern D-3. Thinking about it, it should be old enough to be in a museum now being that these tractors are pushing 40. The fellows that have it, handed it to me in a bushel basket with the transmission apart. Almost back together now. The service book does not list the oils. As I remember, cat always used that in the operators book which we do not have yet. Dandy Dave!
My 70's service manual calls for series 3 30 w for the power shift tranny, my 80's d3 manual calls for TO2 30w---but i i have been told to use TDTO4 in the tranny and oil for the steering clutches--I use 30w as i don't run then much in the winter up here in Ma.
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Sat, Jul 31, 2010 8:19 PM
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