The John Deere 4120 tractor primary engine air filter part number found is AT20728. Cross-reference filters include WIX 49010; NAPA 49010; Baldwin PA1667-FN; Donaldson P181052; more listed below. Filter dimensions found include Height: 5.25 in / 133 mm; Outer diameter: 2.5 in / 64 mm.
Primary air filterAT20728
Cross-referenceWIX 49010
Filter height5.25 in / 133 mm
Engine power41.5 hp
John Deere 4120 Air Filter Specs
Primary air filter part number
AT20728
Pre-filter
RE68048
Cross-reference filters
WIX 49010; NAPA 49010; Baldwin PA1667-FN; Donaldson P181052; FRAM CAK-253
Air filter size
Height: 5.25 in / 133 mm; Outer diameter: 2.5 in / 64 mm
Filter height
5.25 in / 133 mm
Outer diameter
2.5 in / 64 mm
Number of air filter elements
2 elements (primary, pre-filter)
Engine horsepower
41.5 hp
Engine displacement
109.8 cu in (1.8 L)
John Deere 4120 Air Filter Charts
Air filter dimensions
Height
5.25 in
Outer diameter
2.5 in
Engine horsepower
This model
41.5 hp
Average
35 hp
Low
18 hp
High
66 hp
Engine displacement
This model
109.8 cu in
Average
100 cu in
Low
50 cu in
High
180 cu in
John Deere 4120 Air Filter FAQ
What air filter does the John Deere 4120 use?
The primary engine air filter part number found for the John Deere 4120 is AT20728.
What air filter cross-references fit the John Deere 4120?
Cross-reference filters found for the John Deere 4120 include WIX 49010; NAPA 49010; Baldwin PA1667-FN; Donaldson P181052; FRAM CAK-253.
Can I use an aftermarket air filter on the John Deere 4120?
The John Deere 4120 has 5 cross-reference filters listed, starting with WIX 49010. For aftermarket buying, compare brand part number, dimensions, seal shape and air-cleaner housing fit.
What size is the John Deere 4120 air filter?
The air filter dimensions found for the John Deere 4120 are Height: 5.25 in / 133 mm; Outer diameter: 2.5 in / 64 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 4120?
This page lists 2 elements (primary, pre-filter). The pre-filter is separate from the main paper element and should not be confused with the primary filter number.
Why include engine specs on a John Deere 4120 air filter page?
Engine specs found for the John Deere 4120 include 41.5 hp, 109.8 cu in (1.8 L). Those specs help identify the tractor class, but the air filter should still be matched by part number AT20728.
Should I order the John Deere 4120 air filter by size or part number?
The safest buying order for the John Deere 4120 is OEM part number first, then cross-reference brand, then physical size. For this page, that means AT20728 first and Height: 5.25 in / 133 mm; Outer diameter: 2.5 in / 64 mm as a fit check.
What should I confirm before buying a John Deere 4120 air filter?
For the John Deere 4120, confirm AT20728, at least one listed cross-reference, and the dimensions value of Height: 5.25 in / 133 mm; Outer diameter: 2.5 in / 64 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.
