Idlers for Compact Track Loader
CAT 279D Idlers
Replacement idlers for CAT 279D compact track loaders. Guide the track and maintain proper tension. Wholesale pricing with fast shipping from our Houston warehouse.
Verified Part Numbers for CAT 279D
The following part numbers have been verified through extensive compatibility research, fitment validation, and real-world application history for CAT 279D compact track loaders.
Verified Fitment - Compatibility Confirmed
Based on compatibility research, fitment validation, and real-world application history
Primary Part Number
348-9647
Alternate / Interchange Part Numbers
Common Fitment
Cat 259B3, 259D, 259D3, 279C, 279D, 289C, 289D, 299C, 299D
Mount Type / Notes
TRIPLE-FLANGE front idler for the CAT 259/279/289/299 family. A dual-flange front idler (536-3551) and a single-flange rear idler (304-1894) also exist - confirm flange count and position before ordering.
Call 346-438-6252 to verify fitment by serial number before ordering
Additional Researched Part Numbers for CAT 279D
Research-Based Fitment Data: The following part numbers have been researched for compatibility with CAT 279D compact track loaders. Part numbers and fitment vary by serial number range.Please call 346-438-6252 with your machine serial number to confirm exact fitment before ordering.
Research-Based Fitment — Call to Confirm
536-3551
front idler
CAT 259D / 279C / 289C Front Idler 536-3551 (Dual Flange)
Primary Part Number
536-3551
Alternate / Interchange Numbers
Compatible Machines
Caterpillar 259B3, 259D, 279C, 279D, 289C, 299C track loaders.
Mount Type / Chassis Notes
DUAL-FLANGE front idler at the front of the undercarriage. A TRIPLE-FLANGE idler (348-9647 / 536-3552) exists for specific models - customer must confirm whether their machine uses dual or triple flange before ordering. Rear idler is a separate single-flange part (304-1894) that mounts below the sprocket.
Serial Number Specific
Flange count is the critical check: dual (this part) vs triple (348-9647). Have customer confirm or send a photo.
Research-based fitment data. Please call with your machine serial number to confirm compatibility before ordering. Part numbers and fitment may vary by serial range.
346-438-6252 • Houston, TX
Research-Based Fitment — Call to Confirm
304-1894
rear idler
CAT 259D / 279C / 289C Rear Idler 304-1894 (Single Flange)
Primary Part Number
304-1894
Compatible Machines
Caterpillar 259B3, 259D, 279C, 279D, 289C, 299C track loaders.
Mount Type / Chassis Notes
SINGLE-FLANGE rear idler that mounts below the sprocket. Distinct from the front idler (536-3551 dual / 348-9647 triple). Confirm front vs rear position before ordering.
Serial Number Specific
Confirm front vs rear position on the machine.
Research-based fitment data. Please call with your machine serial number to confirm compatibility before ordering. Part numbers and fitment may vary by serial range.
346-438-6252 • Houston, TX
About Track Idlers for CAT 279D
The idler is positioned at the front of the undercarriage, opposite the drive sprocket. It guides the track around the front of the machine and maintains track alignment. The idler also absorbs shock loads when the machine encounters obstacles or uneven terrain.
Idlers contain sealed bearings similar to bottom rollers but are designed to handle higher loads and maintain track alignment under varying terrain conditions. The idler shell may feature single, double, or triple flanges depending on machine design.
The idler assembly includes the track adjuster mechanism, which uses hydraulic or mechanical pressure to maintain proper track tension. Correct tension is critical - too loose causes derailment risk, too tight accelerates wear on all undercarriage components.
How Track Idlers Work
The idler rotates freely on bearings as the track moves around it. Spring or hydraulic pressure pushes the idler forward to maintain track tension. The idler flanges guide the track laterally, preventing it from walking off the undercarriage. On uneven terrain, the idler absorbs impact and allows the track adjuster to compensate for variations.
Signs You May Need a Replacement Idler
Idler problems affect track tension, alignment, and overall undercarriage performance. Watch for these indicators:
•Track Wandering or Walking Off
If the track consistently drifts to one side or tends to walk off the undercarriage, the idler may have worn flanges or internal damage affecting alignment.
•Uneven Idler Surface Wear
Inspect the idler shell for flat spots, grooves, or uneven wear patterns. These indicate bearing problems or misalignment that will worsen if not addressed.
•Noisy Operation or Grinding Sounds
Squealing, grinding, or rumbling from the front of the undercarriage often indicates idler bearing wear or seal failure.
•Track Tension Problems
If track tension cannot be maintained or the track seems loose even after adjustment, the idler or adjuster mechanism may be damaged.
•Leaking Seals
Oil or grease weeping from around the idler indicates seal failure. Contamination will quickly destroy the bearings.
•Wobbling or Excessive Movement
Side-to-side wobble when rotating the idler suggests bearing wear. This affects track guidance and will cause premature track wear.
Fitment Verification
Idler specifications vary significantly by machine model and serial number. Flange configuration (single, double, or triple), shaft dimensions, and overall size must match exactly.
Some machines require specific idler variants based on undercarriage configuration or production changes. Always verify with your serial number.
Contact us with your machine details, and we will confirm the correct idler specifications including flange style and dimensions.
Free Fitment Verification
Not sure which idler fits your CAT 279D? Contact us with your serial number and we will verify the correct part at no charge.
Related CAT 279D Parts
Complete your undercarriage maintenance with these related components for your CAT 279D.
Compatible Rubber Track Sizes for CAT 279D
Find the correct rubber track size for your CAT 279D. Always verify with your serial number for accurate fitment.
Get a Quote for CAT 279D Idlers
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Frequently Asked Questions About CAT 279D Idlers
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