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Thread: Another gear oil question

  1. #1
    Join Date
    Dec 2006
    Location
    Ellerslie, Ga
    Posts
    5

    Default Another gear oil question

    I have a D8 2u that I want to change the oil in the transmission and final drives. What is the correct weight oil to use for the transmission and for the final drives?

    As for the engine, I have been told that a 40w was always used in the engine. I plan to change this oil also.

    The next time I have the D8 out of the barn I will take some pictures to post of the tractor and also of the pull scraper that I have, which I need some help on.

    If climate is a factor in what weight oil, I live in west central Georgia. A cold day to work outside around here is temps in the low 20s.

  2. #2
    Join Date
    Dec 2006
    Location
    Oakland City, Indiana
    Posts
    23

    Default lube in D8

    this will get you close
    Rotella 15W40 in engine, can be ran in transmission too if it has a filter and lube pump to supply oil to all gears and bearings.

    Final drive has no lube pump or filter, and most run 50W engine oil there...we are thinking of changing to synthetic in the final drives...in the old days they ran 90W in the finals, but most books have changed that by now.

  3. #3
    Join Date
    Nov 2006
    Location
    iowa
    Posts
    27

    Default final and trans oil

    I run 140 w green mineral oil in my old cats. They only get run in the spring summer and early fall. the 140w leaks less out of bad seals than the 90w. My oil supplier said this is the best oil for me to use bc the new hp lubes could potentially damage brass and bronze that may be in the bearings. the degergents in the new hp lubes will also make leaks worse. The green mineral oil is detergent free and therefore does not break down or become acetic. Everyone has different ideas but i hope this helps you some.
    Beau nelson

  4. #4
    Join Date
    Nov 2006
    Location
    San Luis Obispo,CA.
    Posts
    145

    Default

    30 or 40 wt in the engine, do not use a multi vis oil in these old engines, 90 wt in the trans and finals, unless you have a little seepage then I would use the 140 in the finals.

  5. #5
    Join Date
    Nov 2006
    Location
    Plains of NW Kansas
    Posts
    514

    Default Engine multi-vis oil

    I have used 15W-40 in the D4 and 112 (both are 315 engines) for many, many years and have never had any problems. It keeps them squeaky clean too!! I use the same engine oil in them that I use in my Green machines!! For tranny and finals I use 90W. I never run them below 0 degrees F as it is too cold anyway!!
    D4Jim
    D47U (1950), 3U 112 Grader (1949), Cat 40 Scraper ACMOC Member 20 years

  6. #6
    Join Date
    Dec 2006
    Location
    Ellerslie, Ga
    Posts
    5

    Default

    Thanks everybody for the info.

    After reading some of the respondes I have another question. I assumed what is in the trans right now is maybe 90w. The trans does have a filter. Would a 90w oil flow okay thru this filter with out crushing it?

    If the weather is good New Years day I plan to do an oil change and get some pictures.

  7. #7
    Join Date
    Nov 2006
    Location
    Southern Maine
    Posts
    82

    Default

    you shouldn't have any problem with gear oil running thru a filter. The rear axle in my freightliner truck (front one ) has a filter mounted on it and it is the same filter chevrolet uses for an oil filter on their engines. I am running 140 wt and change the filter every 50 thousand miles or so.

    George

  8. #8
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    15,121

    Default

    Either 90wt for average ambient temperatures or 140wt in hot climates is correct.

  9. #9
    Join Date
    Dec 2006
    Location
    Tolono,IL
    Posts
    83

    Default

    Quote Originally Posted by Aaron View Post
    30 or 40 wt in the engine, do not use a multi vis oil in these old engines, 90 wt in the trans and finals, unless you have a little seepage then I would use the 140 in the finals.
    I have a pamphlet distributed by Caterpillar from the 50's on service and care of D2's-D8's in a illustrated cartoon format and it specifically says not to use a straight weight oil in the engines as it needs the additives to remove carbon and other deposits. The general rule of thumb I was always told was if the engine has a full flow filter, ie from the pump directly to the filter, use a multi-grade oil as the particles will stay in suspension and be trapped in the filter. If the engine does not have a filter, like some old gas tractors, use straight weight so the particles can settle out and be drained with oil.

  10. #10
    Join Date
    Dec 2006
    Location
    Cypress, TX
    Posts
    198

    Default

    I'm a little confused. I always understood the issue with the filter fitted engines was detergent in the oil to keep particles in suspension so the filter can do it's thing. I thought the multi viscosity was developed to allow a greater range of operating temps???

    Happy new year to all

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