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Air Filters
Fleetguard AF26400 Secondary Air Filter
A safety element for agricultural and construction equipment. It sits inside the main element in the air-cleaner housing and protects the engine intake if the main element is damaged or removed during service. Whether it is the right element for your machine depends on the machine model and the primary element it pairs with, not on the part number alone.
- Part number
- AF26400
- Type
- Secondary / safety air element
- Series
- Magnum RS radial-seal
- Pairs with
- AF26399 primary element
Availability and delivery terms confirmed with quotation.
What AF26400 Is
AF26400 is a Fleetguard secondary air element in the Magnum RS radial-seal series. Its job is to keep unfiltered air out of the engine when the main element is damaged or while the main element is being changed. A safety element and a main element do different jobs and are not interchangeable.
Fleetguard is a filter brand, not ours — AF26400 is a reference point, not a fitment statement. Retailer-published dimensions list roughly 139.5 mm largest outside diameter and about 520 mm height; sources vary, so confirm the exact figures against the manufacturer’s own product record for your machine.
Machine make & model
Record the machine make and model — not the engine family alone. Fitment follows the machine, not the label.
Complete old element number
Read the complete number off the removed element, including any suffix.
Primary element pairing
Note whether you also need the matching primary element (AF26399). State the quantity and whether a genuine original item is required.
AF26400 Specifications
We publish only the interface fields that agree across listings. Dimensions are retailer-published and vary between sources; confirm the exact figures against the manufacturer’s own product record for your machine. Those values are confirmed against the manufacturer specification for your build and stated in your quotation.
| Check | Value to compare | How to confirm |
|---|---|---|
| Type | Secondary / safety element | Not interchangeable with main element |
| Series | Magnum RS radial-seal | Match the old element |
| Pairs with | AF26399 primary element | Confirm both against the machine |
| Largest outside diameter | ~139.5 mm (retailer-published) | Sources vary; confirm per quotation |
| Height | ~520 mm (retailer-published) | Sources vary; confirm per quotation |
Swipe horizontally to view all columns.
AF26400 Cross-References (Candidates to Review)
| Brand | Candidate reference |
|---|---|
| Donaldson | P782108 |
| Baldwin | RS3997 |
| Wix | 49710 |
| Mann-Filter | CF710 |
| Hengst | E630LS |
A cross-reference is a candidate to review, not proof of fitment. Two numbers can share a reference and still differ in seal type, media, or dimensions. Search by number or machine model in the filter lookup.
Applications & ordering
Start with the machine, not the engine family.
Claas combines / Valtra S-series / Ropa loaders / ABG & Terex pavers
Listed applications include agricultural and construction equipment — Claas combines, Valtra/Valmet S-series tractors, Ropa loaders, and ABG/Terex pavers, among others. Some listings call it a truck filter. Fitment follows the machine, not the label.
Where two records disagree, send both — the difference usually points to a supersession, a build variation, or an element fitted to the wrong specification.
Know exactly what is being quoted.
Each line is checked against the parts record and filter position. Your quotation states the offered item, maker, complete part number, quantity and delivery terms. Every offered item is checked before quoting — see quality control and verification.
Availability is confirmed against your list. No real-time stock feed is published.
Request a QuoteFrequently Asked Questions
What is a secondary (safety) air filter?
A secondary air element sits inside the main element and protects the engine if the main element fails or is removed for service. It is a different part from the main element and is not interchangeable with it.
Is AF26400 the same as the main air filter?
No. AF26400 is the safety element that pairs with the AF26399 primary element. Both are separate lines; ordering the safety element alone does not replace the main element.
What is the Donaldson equivalent of AF26400?
Donaldson lists P782108 as the interchange for AF26400. Treat it as a candidate to review, not a confirmation of fitment.
What primary filter pairs with AF26400?
The matching primary element is Fleetguard AF26399 (739AF26399). Confirm both against the machine before ordering.
Does AF26400 fit my Claas combine or Valtra tractor?
It is listed on select Claas combines, Valtra/Valmet S-series tractors, and other agricultural and construction machines. Fitment is machine- and build-dependent, so confirm the machine model and the number off the removed element.
Confirm the number. Then confirm the machine.
Send the machine model, the complete number off the old element,
and whether you also need the matching primary (AF26399).