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Komatsu D37-P

Discussion in 'Dozers' started by 3130, May 10, 2022.

  1. 3130

    3130 Member

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    Apr 20, 2021
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    Location:
    Mississippi
    Guys, the manual calls for 15W-40 motor oil for the hydraulic system. However, dealer parts techs are telling me I can use hydraulic oil instead. What are you guys using? TIA
     
  2. John C.

    John C. Senior Member

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    What is the Dash number on the machine? Hydraulic oil works just fine on the older generation machines. Maybe provide a serial number and someone can provide the information you are looking for.
     
  3. 3130

    3130 Member

    Joined:
    Apr 20, 2021
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    Location:
    Mississippi

    Sorry.... its a D37P-5. I'm worried motor oil could damage the pump being so thick.
     
  4. epirbalex

    epirbalex Senior Member

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    Occupation:
    peasant
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    My dozer's have different recommendations for seasonal difference in temperature's for the motor , for the hydraulics they say to use engine oil . Match your hydraulic oil to the requirement for your engine as the seasons change . I'm lucky where I am , it has a mild climate , so make do with 15-40 for both uses year round .
     
  5. 3130

    3130 Member

    Joined:
    Apr 20, 2021
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    Location:
    Mississippi
    Have you ever had any issues with pump seals going out using motor oil?
     
  6. epirbalex

    epirbalex Senior Member

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    No , Komatsu manuals list what they need used . I have questioned the requirement for engine oil to be used in the Komatsu DWT125 winch while the transmission needs a 30 grade oil . Seems to me the winch could use the same oil . I can't see any risk using a hydraulic oil in your hydraulic system but can see a risk of using different oils, one may get used in the wrong application . One less grade of oil used on a dozer leaves less room for error . I think that may be behind what Komatsu were thinking .