The John Deere 6603 tractor primary engine air filter part number found is AT311066. Cross-reference filters include Baldwin RS5509; Donaldson P640496; Fleetguard AF26251. Filter dimensions found include Height: 20.5 in / 521 mm; Outer diameter: 12.06 in / 306 mm; Inner diameter: 7.75 in / 197 mm.
Height: 20.5 in / 521 mm; Outer diameter: 12.06 in / 306 mm; Inner diameter: 7.75 in / 197 mm
Filter height
20.5 in / 521 mm
Outer diameter
12.06 in / 306 mm
Inner diameter
7.75 in / 197 mm
Number of air filter elements
3 elements (primary, secondary, pre-filter)
Engine horsepower
109 hp
Engine displacement
414 cu in (6.8 L)
John Deere 6603 Air Filter Charts
Air filter dimensions
Height
20.5 in
Outer diameter
12.06 in
Inner diameter
7.75 in
Engine horsepower
This model
109 hp
Average
95 hp
Low
45 hp
High
175 hp
Engine displacement
This model
414 cu in
Average
250 cu in
Low
120 cu in
High
420 cu in
John Deere 6603 Air Filter FAQ
What air filter does the John Deere 6603 use?
The primary engine air filter part number found for the John Deere 6603 is AT311066.
What air filter cross-references fit the John Deere 6603?
Cross-reference filters found for the John Deere 6603 include Baldwin RS5509; Donaldson P640496; Fleetguard AF26251.
Can I use an aftermarket air filter on the John Deere 6603?
The John Deere 6603 has 3 cross-reference filters listed, starting with Baldwin RS5509. For aftermarket buying, compare brand part number, dimensions, seal shape and air-cleaner housing fit.
What size is the John Deere 6603 air filter?
The air filter dimensions found for the John Deere 6603 are Height: 20.5 in / 521 mm; Outer diameter: 12.06 in / 306 mm; Inner diameter: 7.75 in / 197 mm. Use these dimensions as a fit check, but treat the part number as the main match.
How many air filter elements are listed for the John Deere 6603?
This page lists a primary filter, a safety filter and a pre-filter: 3 elements (primary, secondary, pre-filter). Replace each only with the matching part number for that position.
Why include engine specs on a John Deere 6603 air filter page?
The engine data kept for the John Deere 6603 is 109 hp, 414 cu in (6.8 L). Use it as supporting context only; the actual filter match is still driven by the air-cleaner housing and part number AT311066.
Should I order the John Deere 6603 air filter by size or part number?
Use AT311066 as the main match for the John Deere 6603. The cross-reference list helps find aftermarket options, while the measured dimensions helps avoid ordering a filter that does not seat correctly.
What should I confirm before buying a John Deere 6603 air filter?
For the John Deere 6603, confirm AT311066, at least one listed cross-reference, and the dimensions value of Height: 20.5 in / 521 mm; Outer diameter: 12.06 in / 306 mm; Inner diameter: 7.75 in / 197 mm against the actual filter before ordering.
Official information note
Air filter fit can change by engine, serial number, production year and air-cleaner housing. Check the operator manual, parts manual and official deere.com website before buying or fitting an air filter.
