The John Deere 420 tractor primary engine air filter part number found is AT183661. Filter dimensions found include Height: 9.5 in / 241 mm; Outer diameter: 6.5 in / 165 mm; Inner diameter: 3 in / 76 mm.
Primary air filterAT183661
Filter height9.5 in / 241 mm
Engine power20 hp
John Deere 420 Air Filter Specs
Primary air filter part number
AT183661
Secondary / safety air filter
AN403919
Air filter size
Height: 9.5 in / 241 mm; Outer diameter: 6.5 in / 165 mm; Inner diameter: 3 in / 76 mm
Filter height
9.5 in / 241 mm
Outer diameter
6.5 in / 165 mm
Inner diameter
3 in / 76 mm
Number of air filter elements
2 elements (primary, secondary)
Engine horsepower
20 hp
Engine displacement
115.9 cu in (1.9 L)
John Deere 420 Air Filter Charts
Air filter dimensions
Height
9.5 in
Outer diameter
6.5 in
Inner diameter
3 in
Engine horsepower
This model
20 hp
Average
35 hp
Low
18 hp
High
66 hp
Engine displacement
This model
115.9 cu in
Average
100 cu in
Low
50 cu in
High
180 cu in
John Deere 420 Air Filter FAQ
What air filter does the John Deere 420 use?
The primary engine air filter part number found for the John Deere 420 is AT183661.
What size is the John Deere 420 air filter?
The air filter dimensions found for the John Deere 420 are Height: 9.5 in / 241 mm; Outer diameter: 6.5 in / 165 mm; Inner diameter: 3 in / 76 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 420?
This page lists 2 elements (primary, secondary). That means the safety element should be treated separately from the outer primary air filter.
Why include engine specs on a John Deere 420 air filter page?
Engine specs found for the John Deere 420 include 20 hp, 115.9 cu in (1.9 L). Those specs help identify the tractor class, but the air filter should still be matched by part number AT183661.
Should I order the John Deere 420 air filter by size or part number?
For the John Deere 420, use AT183661 as the main buying number and use the dimensions value of Height: 9.5 in / 241 mm; Outer diameter: 6.5 in / 165 mm; Inner diameter: 3 in / 76 mm only as a secondary fit check.
What should I confirm before buying a John Deere 420 air filter?
For the John Deere 420, confirm AT183661 against John Deere parts information and use the listed dimensions of Height: 9.5 in / 241 mm; Outer diameter: 6.5 in / 165 mm; Inner diameter: 3 in / 76 mm as a physical check.
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.
