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  1. #1
    Gold Member Rusty's Avatar
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    May 2003
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    381
    Location
    Hampton Township, Bay County, Michigan
    Tractor
    Kubota B7500HSD-R

    Default Replace secondary (inner) air filter?

    The operator's manual for my B7500 specifies replacing the secondary (inner) air cleaner element every year. I have changed it every 200 hours (12-15 months) since I bought the tractor new. I have not seen any trace of soiling on any of the three secondary elements that I have replaced. In a discussion today with the parts man at my kubota dealer, he questioned why I replace a filter that is still "clean."

    How often do the rest of you replace the secondary air cleaner element? What criteria do you use to determine when to replace this filter?

    Thanks, in advance!

  2. #2
    Elite Member wushaw's Avatar
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    Mar 2005
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    3,075
    Location
    Bristol Texas
    Tractor
    Kubota L2800, 15 hp 372 Mitsubishi

    Default Re: Replace secondary (inner) air filter?

    My criteria is:

    1. Dirty filter get the boot.
    2. Clean filter stays till it meets criteria one.

  3. #3
    Veteran Member lawn_king's Avatar
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    Jun 2006
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    1,593
    Location
    Hanover massachusetts
    Tractor
    kubota L 3540 hsdc,B 2320 hsdc & lots of other stuff!

    Default Re: Replace secondary (inner) air filter?

    I ran a B7500 for 700 hrs. over six seasons. I replaced the outer filter every 150 hours or so, i never replaced the inner filter as it never got soiled.
    We have done so much, for so long,with so little, we are now qualified to do anything with nothing!

  4. #4
    Super Member
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    Feb 2006
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    7,689
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: Replace secondary (inner) air filter?

    Quote Originally Posted by Rusty
    The operator's manual for my B7500 specifies replacing the secondary (inner) air cleaner element every year. I have changed it every 200 hours (12-15 months) since I bought the tractor new. I have not seen any trace of soiling on any of the three secondary elements that I have replaced. In a discussion today with the parts man at my kubota dealer, he questioned why I replace a filter that is still "clean."

    How often do the rest of you replace the secondary air cleaner element? What criteria do you use to determine when to replace this filter?

    Thanks, in advance!
    Since I dont like to waste $ I never replace it. The outer one is a much finer filter with much greater area. It does all the work. The secondary is just there in case of failure of the primary. The primary can rupture if you dont clean or replace it appropriately. If that ever happens you replace them both. I clean my outer filter enuf and it has never failed, so I have never replaced an outer filter either.
    larry

  5. #5
    Platinum Member big bubba's Avatar
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    Mar 2007
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    636
    Location
    arkansas
    Tractor
    m8540

    Default Re: Replace secondary (inner) air filter?

    academic question: can a visual always determine when a filter needs changing? also, don't forget the manual stating not to touch or handle the inner element for some reason. the quality of the intake air flow, aside from fuel & engine oil quality, determines the longevity of diesels. I've heard from K mechanics where owners used after market air filters, duct taping non stock openings in them, and dusting the engine in a hurry. I'd almost rather go slightly over on an oil change than save a few $ on air filters...... yeah, I'm neurotic, but a change of air filters, in some cases, is less than the monthly interest of a payment....and big bub (7040) will be paid off in several months bb

  6. #6
    Elite Member RobJ's Avatar
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    Jul 2005
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    3,470
    Location
    Spring, TX (Houston)
    Tractor
    Kubota L2500

    Default Re: Replace secondary (inner) air filter?

    Yeah but aren't those inners expensive. I PM my neighbors Ford 4630 and I think the inner is triple the price of the outer. I just keep a clean outter for now.

    My little L only has 1.
    L2500

  7. #7
    Gold Member Rusty's Avatar
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    May 2003
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    381
    Location
    Hampton Township, Bay County, Michigan
    Tractor
    Kubota B7500HSD-R

    Default Re: Replace secondary (inner) air filter?

    All - Thanks for the comments! I'm still thinking about this. I am in the "Don't be cheap on maintenance" crowd, but I am really wondering about this one. My inner filter is a metal mesh (fine opening screen) material that you can look thru - no pleated opaque fabric - no visual soiling.


    Quote Originally Posted by RobJ
    Yeah but aren't those inners expensive. I PM my neighbors Ford 4630 and I think the inner is triple the price of the outer.
    Rob - For my B7500, the outer element was $34.76 and the inner element was $32.34 the last time I bought (about 15 months ago).

  8. #8
    Platinum Member big bubba's Avatar
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    Mar 2007
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    636
    Location
    arkansas
    Tractor
    m8540

    Default Re: Replace secondary (inner) air filter?

    rusty: I'll bet you're 98% okay most times on the inner from what you describe. Just something not to be taken for granted. why not ask an impartial K mechanic about it, or call central @ 817 571 0900 (w/SN on hand) and ask for Larry or David in tech bb

  9. #9
    Elite Member RobJ's Avatar
    Join Date
    Jul 2005
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    3,470
    Location
    Spring, TX (Houston)
    Tractor
    Kubota L2500

    Default Re: Replace secondary (inner) air filter?

    Quote Originally Posted by Rusty


    [B
    Rob[/B] - For my B7500, the outer element was $34.76 and the inner element was $32.34 the last time I bought (about 15 months ago).
    Wow both pricey. That Ford is a 50hp range tractor, I think the outer is about $20(and a huge filter), the inner about $50 something.
    L2500

  10. #10
    Gold Member Rusty's Avatar
    Join Date
    May 2003
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    381
    Location
    Hampton Township, Bay County, Michigan
    Tractor
    Kubota B7500HSD-R

    Default Re: Replace secondary (inner) air filter?

    Quote Originally Posted by big bubba
    rusty: I'll bet you're 98% okay most times on the inner from what you describe. Just something not to be taken for granted. why not ask an impartial K mechanic about it, or call central @ 817 571 0900 (w/SN on hand) and ask for Larry or David in tech bb
    big bubba - Thanks! I just off the telephone with Larry at kubota Central. He said that the inner filter element is a safety net in case of damage/failure of the outer primary element. Although my casual observation of the inner element led me to believe that it has larger openings than the primary filter, Larry says that the inner element provides finer filtration. It can continue to be used until damage/failure of the primary element, or observable soiling of the secondary element. I intend to keep changing the primary element every 200 hours, but only replacing the secondary element as described above.

    Thanks, again, to all!!!

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