CAT 249D Front Idler | Part #420-9803

This front idler is listed for the Cat 249D and matches OEM Part #420-9803. Before ordering, compare your machine make, model, serial number, and existing part number to confirm the correct undercarriage position and fitment.

Matching drive sprocket options for the Cat 249D include CAT 249D Sprocket | Part #304-1870. When installing new rubber tracks, inspect sprockets for hooked, sharp, or uneven teeth because worn sprockets can shorten track life and damage the drive lugs.

Matching bottom roller or track roller options for the Cat 249D include CAT 249D Track Roller | Part #420-9801. Replacing worn rollers before installing new rubber tracks helps keep the undercarriage aligned and reduces uneven wear across the track carcass.

Matching rubber track options connected to this Cat 249D undercarriage setup include CAT 249D Rubber Tracks (Part #320X86BX49). If you are replacing this part, inspect the full undercarriage so the new component and rubber tracks wear evenly together.

Yes. Sprockets, idlers, rollers, and rubber tracks wear together as a system. Before replacing this part for the Cat 249D, inspect the full undercarriage for uneven wear, bearing play, hooked sprocket teeth, and track tension issues.

Confirm fitment by checking your machine make, model, serial number, and existing track size or OEM part number. For rubber tracks, verify width, pitch, and link count. For undercarriage parts, compare the part number, bolt pattern, tooth count, and machine position. You can also use the TrackTECH Track Finder or call (850) 816-7898 before ordering.

TrackTECH ships rubber tracks and undercarriage parts quickly across the Lower 48. Heavy items typically ship by freight, while smaller undercarriage parts may ship by parcel depending on warehouse availability. Review TrackTECH shipping information or contact us before ordering if you need priority freight options.