Filter Cross Reference

    Fleetguard AF25521 cross reference

    Baldwin replacement for AF25521

    Baldwin lists RS3709 as the replacement for AF25521.

    Source: Baldwin Manufacturers' Cross-Reference, Form 560-24 (2024).

    Part numbers Fleetguard AF25521 replaces

    Fleetguard lists AF25521 as the replacement for these manufacturer part numbers:

    ManufacturerTheir part number
    CASE (CASE)128782A1
    CATERPILLAR (CAT)3I-2144
    WIX (WIX)46663
    WIX (WIX)546663
    NAPA (NAPA)AF821M 6663
    CARQUEST (CARQ)88663
    BIG A (BIGA)94663
    HASTINGS (HAST)AF2282
    FRAM (FRAM)CA9874SY
    MANN & HUMMEL (MANN)CF99
    KRALINATOR (KRAL)LA1609
    LUBERFINER (LBRF)LAF8405
    DONALDSON (DON)P536941
    DONALDSON (DON)P601476
    BALDWIN (BALD)RS3709

    Source: Fleetguard Cross Reference by Part Number, doc LT19457D (2012). Fleetguard's published direction is manufacturer part → Fleetguard replacement.

    Currentness: these crosses come from Fleetguard's 2012 list and have not been revalidated as current. Baldwin's 2024 list gives the same replacement for AF25521 and 11 of the 15 part numbers above. That shows a shared Baldwin replacement only. It does not verify that those numbers interchange with AF25521 today.

    Upgrade chains run one way: equipment spec'd with a newer filter number should not step back to the older one. Go by what the truck was spec'd with.

    Always verify against the current OEM catalog before ordering. Cross references are a starting point, not a guarantee of fit.

    Buy AF25521: FinditParts