Inner filter change on donaldson air filter

Discussion in 'Mechanic and Repair' started by weeze, Dec 26, 2012.

  1. weeze

    weeze LawnSite Fanatic
    Messages: 12,746

    how often do you guys change the inner filter on your donaldson type air filters? i blow the outer one out with compressed air every 50hrs and when it gets to looking bad i replace it. the inner one however stays pretty much clean. how long do you let it go before you change it? i've had the original one on there for 2 years so far and it still looks clean. i'm just looking for a ballpark figure or for ideas about how you guys do things. thanks.
  2. rreyn1812

    rreyn1812 LawnSite Senior Member
    Messages: 444

    Depends on usage, and also, I think, on the size of the filter. On my Bob-Cat with the 20hp Kawa, I change both inner and outer once a year (smaller Donaldson), and on the John Deere with the 27hp Kawa, I change the inner maybe once every 2 years, but the outer every year.
  3. KS_Grasscutter

    KS_Grasscutter LawnSite Gold Member
    Messages: 3,336

    I have to replace my inner filters once or twice a season. For some reason they disintegrate before they get dirty enough to need replaced. I blow out the outer filters as needed, daily for the first couple weeks in the spring and the last couple months in the fall, and about once a week or twice a month during the growing season. I typically replace the outer filters once a season, unless I have to replace the inner filter, at which time I will do both at once.
  4. weeze

    weeze LawnSite Fanatic
    Messages: 12,746

    i have this kind. this is the only picture i could find.

  5. weeze

    weeze LawnSite Fanatic
    Messages: 12,746

    i have a new inner filter still brand new in the box but the old one still looks brand new as well.
  6. Jimslawncareservice

    Jimslawncareservice LawnSite Platinum Member
    from mn
    Messages: 4,143

    Mine are all the same. All look brand new. Even at 1200 and 1800 hours. Deere mechanics say just to replace them yearly on heavy use and every couple on light use. Filters are cheap. So am I when they look new
    Posted via Mobile Device
  7. weeze

    weeze LawnSite Fanatic
    Messages: 12,746

    so i'll guess i'll change the inner one around every 500hrs. sounds good enough to me.
  8. orangemower

    orangemower LawnSite Silver Member
    from pa
    Messages: 2,768

    If the inner filter is still clean then you don't need to replace it. Doesn't matter if it has 5hrs or 5000hrs.
  9. laman

    laman LawnSite Senior Member
    Messages: 351

    I change my inner filter when it is not white anymore. It starts looking kind of a light grey color. It takes a while before this happens. I usually change the outer filter year and a half to two years all depends on how dusty it is.
  10. PLS-Tx

    PLS-Tx LawnSite Silver Member
    from Texas
    Messages: 2,383

    Our inner filters are blue. Dealer told us to watch for small holes in them, when you see them it's time to change. That's what we do but they never do get dirty.

    I may be changing the outer more than I need to but it gets real dusty here at times.

    We do blow the outer, from the inside out, every day. Again, this is what our dealer has said we should do, been wondering if this may be overboard.

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