Bottom Rollers for Mini Excavator
CAT 305DCR Bottom Rollers
Replacement bottom rollers for CAT 305DCR mini excavators. Support and distribute machine weight across the track. Wholesale pricing with fast shipping from our Houston warehouse.
Researched Part Numbers for CAT 305DCR
Research-Based Fitment Data: The following part numbers have been researched for compatibility with CAT 305DCR 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
158-4765
bottom roller
CAT 304.5 / 305.5 Bottom Roller 158-4765
Primary Part Number
158-4765
Alternate / Interchange Numbers
Supersession / Interchange Notes
CAT dealer part numbers 158-4765, 340-8957, 333-5606 reference the same bottom roller.
Compatible Machines
Caterpillar 304, 304.5, 305, 305.5, 304CR, 305CR, 306; Mitsubishi MM45 mini excavators.
Mount Type / Chassis Notes
Bottom roller mounts to the track frame with a 10mm bolt (bolt not always included). Roller count per machine varies: 304CR uses 8 per machine, 305CR and 304.5 use 10 per machine. Confirm count on the customer's machine.
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
265-7674
bottom roller
Cat 304C CR / 305C CR Bottom Roller 265-7674
Primary Part Number
265-7674
Alternate / Interchange Numbers
Supersession / Interchange Notes
Superseded to 422-0837.
Compatible Machines
Caterpillar 304CCR, 305CCR, 305DCR, 305ECR, 305E2, 305E2CR, 305.5D, 305.5DCR, 305.5E, 305.5E2, 305.5ECR, 303.5E2CR, 305.5E2FB, 306E2FB
Mount Type / Chassis Notes
Single flange center guide bottom roller; bolts to track frame with two bolts.
Serial Number Specific
305E2CR S/N DJX/H5M; 305.5D S/N FLZ; 305.5E2 S/N EJX/CR5; 305.5E2FB S/N WE2; 306E2FB S/N E2W noted by RubberTrax.
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
422-0837
bottom roller
Cat 304C CR / 305C CR Bottom Roller 422-0837
Primary Part Number
422-0837
Alternate / Interchange Numbers
Supersession / Interchange Notes
422-0837 is supersession from 265-7674.
Compatible Machines
Same page as 265-7674: Cat 304/305/305.5/306E2 family listed
Mount Type / Chassis Notes
Single flange center guide bottom roller.
Serial Number Specific
See 265-7674 serial notes.
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 305DCR
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 305DCR? Contact us with your serial number and we will verify the correct part at no charge.
Related CAT 305DCR Parts
Complete your undercarriage maintenance with these related components for your CAT 305DCR.
Get a Quote for CAT 305DCR Bottom Rollers
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Frequently Asked Questions About CAT 305DCR Bottom Rollers
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