CAT 259D Front Idler | Part #304-1878

This front idler is listed for the Cat 259D and matches OEM Part #304-1878. 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 259D include CAT 259D 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 259D include CAT 259D Track Roller | Part #304-1890. Replacing worn rollers before installing new rubber tracks helps keep the undercarriage aligned and reduces uneven wear across the track carcass.

Matching rear idler options for the Cat 259D include CAT 259D Rear Idler | Part #304-1894. A worn rear idler can contribute to poor track alignment, derailment, and premature edge wear, especially after new rubber tracks are installed.

Matching rubber track options connected to this Cat 259D undercarriage setup include CAT 259D Rubber Tracks | 320x86x53 (Part #320X86BX53). 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 259D, 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.

Check the size stamp molded into your existing track (format: Width x Pitch x Links, e.g., 450x86x60) or use our Track Finder tool to confirm the correct size for your your machine.

All your machine replacement rubber tracks include a 24-month warranty covering defects in materials and workmanship under normal operating conditions. This applies to contractor-grade use on properly maintained undercarriage systems.

Multiple tread patterns are available including C-Block (hard surfaces), Zig-Zag (all-terrain), and Multi-Bar (turf-friendly). Select based on your primary work environment.

Orders placed before 12 PM CT ship same day from our Georgia warehouse. Standard delivery is 1-3 business days nationwide. Tracks ship on pallets with free curbside delivery to commercial addresses.

Three ways to verify fitment: (1) Check the size stamp on your current track. (2) Use our Track Finder tool with your serial number. (3) Call (850) 816-7898 and we will confirm compatibility before you order.