The John Deere 1120 tractor primary engine air filter part number found is AT20728.
Primary air filterAT20728
Engine power20 hp
John Deere 1120 Air Filter Specs
Primary air filter part number
AT20728
Secondary / safety air filter
AN403919
Number of air filter elements
2 elements (primary, secondary)
Engine horsepower
20 hp
Engine displacement
67.1 cu in (1.1 L)
John Deere 1120 Air Filter Charts
Engine horsepower
This model
20 hp
Average
35 hp
Low
18 hp
High
66 hp
Engine displacement
This model
67.1 cu in
Average
100 cu in
Low
50 cu in
High
180 cu in
John Deere 1120 Air Filter FAQ
What air filter does the John Deere 1120 use?
The primary engine air filter part number found for the John Deere 1120 is AT20728.
How many air filter elements are listed for the John Deere 1120?
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 1120 air filter page?
Engine specs found for the John Deere 1120 include 20 hp, 67.1 cu in (1.1 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 1120 air filter by size or part number?
Start with AT20728 when buying an air filter for the John Deere 1120. Do not rely only on the model name if there were production changes.
What should I confirm before buying a John Deere 1120 air filter?
For the John Deere 1120, confirm AT20728 against the parts manual or official John Deere lookup because air-cleaner parts can change by serial range.
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.
