Bottom Rollers for Mini Excavator
CAT 302.5 Bottom Rollers
Replacement bottom rollers for CAT 302.5 mini excavators. Support and distribute machine weight across the track. Wholesale pricing with fast shipping from our Houston warehouse.
Researched Part Numbers for CAT 302.5
Research-Based Fitment Data: The following part numbers have been researched for compatibility with CAT 302.5 mini excavators. 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
185-7280
bottom roller
CAT 302.5 / 303.5 / 303CR Bottom Roller 185-7280
Primary Part Number
185-7280
Alternate / Interchange Numbers
Supersession / Interchange Notes
Also listed as 1857280 / CA185-7280 (formatting variants of the same roller).
Compatible Machines
Caterpillar 302.5, 303.5, 303CR; Mitsubishi MM25, MM35 mini excavators. Approx 15 lbs.
Mount Type / Chassis Notes
Bottom roller, runs down the center of the undercarriage, approx 15 lbs.
Serial Number Specific
Rubbertrax warns C / CR / CCR / D / DCR sub-models can each take a different roller - verify the exact model from the serial plate before ordering.
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
1857280
bottom roller
CAT 1857280 Bottom Roller
Primary Part Number
1857280
Alternate / Interchange Numbers
Compatible Machines
Cat 302.5, 303.5, 303CR, Mitsubishi MM25, MM35
Mount Type / Chassis Notes
DUPLICATE of staged-018 (185-7280) - same CAT 302.5/303.5/303CR bottom roller, unformatted number. See staged-018 for full enrichment. Merge/remove in dedup cleanup.
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
266-8793
bottom roller
Caterpillar 302.5C / 303CCR Bottom Roller 266-8793
Primary Part Number
266-8793
Alternate / Interchange Numbers
Supersession / Interchange Notes
RubberTrax says 266-8793 is superseded by Cat dealer part number 468-7455.
Compatible Machines
Cat 302.5C, 303CCR, 303ECR, 303.5C, 303.5CCR, 303.5D, 303.5DCR, 303.5E, 303.5ECR, 303.5E2CR, 304DCR, 304E, 304ECR, 304E2CR, 304.5E2 CR XTC
Mount Type / Chassis Notes
Center flange inside-guide bottom roller; bolts not included.
Serial Number Specific
No specific serial break extracted from page text; verify by serial before ordering.
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 Bottom Rollers for CAT 302.5
Bottom rollers (also called track rollers or lower rollers) are mounted along the track frame and roll against the inside of the rubber track. They carry the entire weight of the machine and distribute it evenly across the track, reducing point loading and premature track wear.
Each roller contains sealed bearings and lubricant that allow smooth rotation under heavy loads. The outer shell is typically hardened steel designed to resist wear from abrasive materials like sand, gravel, and debris.
Quality bottom rollers feature double-sealed or triple-sealed bearings to prevent contamination and extend service life. The seal design is critical in harsh environments where mud, water, and fine particles can compromise bearing function.
How Bottom Rollers Work
Bottom rollers ride along the inside of the track, supporting the machine's weight while allowing the track to move freely. They maintain track alignment and prevent the track from contacting the track frame. As the track rotates, the rollers spin on their bearings, distributing load and reducing friction.
Signs You May Need Replacement Bottom Rollers
Regular inspection of your bottom rollers can prevent costly track damage and downtime. Watch for these warning signs that indicate replacement may be needed:
•Flat Spots or Uneven Wear
Visible flat spots on the roller surface indicate bearing failure or seized rotation. This causes the roller to slide rather than roll, damaging both the roller and the track inner surface.
•Wobbling or Excessive Play
Side-to-side movement or bearing play causes track misalignment and uneven wear. This often indicates worn bearings or internal damage that will worsen rapidly.
•Leaking Seals or Oil Weeping
Oil around the roller face or shaft indicates seal failure. Without proper lubrication, bearings will fail quickly, often within hours of continued operation.
•Grinding or Unusual Noise
Metallic grinding, squealing, or rumbling during operation suggests bearing damage or debris contamination. Stop operation and inspect immediately to prevent further damage.
•Track Derailment or Walking
Worn rollers lose their ability to guide the track properly, leading to the track walking off to one side or complete derailment. This can cause significant damage to the track and undercarriage.
•Premature Track Wear
If your tracks are wearing faster than expected, damaged bottom rollers may be causing uneven contact or increased friction. Replacing worn rollers can significantly extend track life.
Fitment Verification
Bottom roller specifications can vary by serial number, production year, and undercarriage configuration. Some machines have solid-mount rollers while others use suspension-mount designs.
Always verify your machine's serial number before ordering. Our team can cross-reference your serial to confirm the correct roller style, mounting pattern, and quantity.
If you are unsure about roller specifications, contact us with your machine serial number and we will confirm exact fitment at no charge.
Free Fitment Verification
Not sure which bottom roller fits your CAT 302.5? Contact us with your serial number and we will verify the correct part at no charge.
Related CAT 302.5 Parts
Complete your undercarriage maintenance with these related components for your CAT 302.5.
Compatible Rubber Track Sizes for CAT 302.5
Find the correct rubber track size for your CAT 302.5. Always verify with your serial number for accurate fitment.
Get a Quote for CAT 302.5 Bottom Rollers
Contact us with your machine details for competitive wholesale pricing. Include your serial number for accurate fitment verification.
Get wholesale pricing on rubber tracks and undercarriage parts. We respond within 2 business hours.
Frequently Asked Questions About CAT 302.5 Bottom Rollers
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