Power steering pump

Discussion in 'Western Star Forum' started by n4ane, Dec 6, 2020.

  1. n4ane

    n4ane Bobtail Member

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    So I am replacing my power steering pump due to it constantly leaking motor oil. I ordered the pump online with part number from dealer. I have read on several places here where people are putting 15w40 in the power steering system instead of power steering fluid or atf. When I opened the box and pulled the directions it says to use a atf with low foam. so do I need to use atf or just put motor oil in it since that's whats already in the system? I would like to flush all the old oil out just so its all new fluid.
     
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  3. n4ane

    n4ane Bobtail Member

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  4. Cetane+

    Cetane+ Road Train Member

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    So the pump is just a low pressure gear pump. It will work with engine oil or atf. The atf has better clutch plate wear properties and a lower pour point.
     
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  5. AModelCat

    AModelCat Road Train Member

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    Should be able to use either or. I would stick with whatever is currently in the system to avoid mixing fluids. You'll never get 100% of the old oil out unless you completely tear down the steering box.
     
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  6. BoxCarKidd

    BoxCarKidd Road Train Member

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    It really went by the steering sector mfg recommendation.
    Sheppard used 15 W 40.
    Ross - TRW used ATF.
    A major I worked for had new trucks come in with Ross boxes. Ross said they would not honer warranty if ATF was not used. Company said we have over 300 shops and have no reason to inventory ATF. Even the service trucks are manuals. If we have to add all the inventory for your steering boxes we will make a point not to buy new trucks with them anymore. Then 15 W 40 was fine.
    The 2019 Pete here with a Sheppard is labeled for ATF.
    Your concern is the warranty of your new pump. Flush the system replace the filter and use the fluid they specify.
    An exception to that could be a Saginaw or ? ( some other unusual sector ) . They can have a be reaction to anything but P/S fluid.
     
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  7. n4ane

    n4ane Bobtail Member

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    How do I know it its a sheppard or a ross?
     
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  8. BoxCarKidd

    BoxCarKidd Road Train Member

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    Name is normally cast in the side of the box or post a picture.
     
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  9. n4ane

    n4ane Bobtail Member

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    Ok I will take one tomorrow
     
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