The RD148-21700 bottom track roller for Kubota mini-excavators can be replaced without removing the rubber tracks by releasing track tension, unbolting the old roller, installing the new one, and re-tensioning the track. This process requires basic tools including a grease gun, socket set, and a pry bar for smooth replacement.
What Is the RD148-21700 Track Roller, and Which Kubota Models Use It?
The RD148-21700 is a bottom track roller compatible with Kubota models KX121-3, KX121-3S, KX121-3ST, KX040-4, and KX161-3. It plays a vital role in supporting the undercarriage and distributing machine weight, providing smooth track movement on these mini-excavators.
Where Can You Buy Authentic RD148-21700 Bottom Rollers?
You can purchase genuine RD148-21700 rollers from Kubota dealerships or reputable aftermarket suppliers such as RubberTrax, Mytee Products, and AFT Parts. Major marketplaces like Amazon, eBay, and Walmart also offer compatible options from brands including Solarhome and DVPARTS, though quality and authenticity may vary.
How Do Aftermarket Parts Compare to OEM RD148-21700 Rollers?
Aftermarket parts typically cost less and vary in quality. Suppliers like AFT Parts specialize in precision-engineered rollers designed to match or exceed OEM standards, offering durability and performance. Budget options on marketplaces may lack longevity and warranty support, so buyer caution is advised.
When Should You Replace the RD148-21700 Bottom Track Roller?
Replace the roller when you notice excessive wear, uneven track tension, unusual noises during operation, or visible damage such as cracks or leaking grease. Timely replacement prevents further undercarriage wear, reduces downtime, and maintains machine performance.
How Do You Properly Release Track Tension Before Replacement?
Use a socket wrench to remove the grease fitting on the track tensioning cylinder. This action releases internal pressure and slackens the track, providing the clearance needed to unbolt and remove the bottom roller safely without removing the rubber tracks.
What Tools Are Needed to Replace the RD148-21700 Bottom Roller?
Essential tools include a grease gun to reapply grease during re-tensioning, a socket set for removing and fastening roller bolts, and a pry bar to assist in loosening the old roller from the track frame. Proper tools ensure safe, efficient replacement.
How Do You Remove and Install the RD148-21700 Bottom Track Roller?
After relieving track tension, unbolt the two bolts securing the old roller to the track frame. Carefully remove the roller, position the new one, and bolt it in place without overtightening. Then reinstall the grease fitting and use the grease gun to pressurize the track system for proper tension.
| Replacement Step | Description | Tools Required |
|---|---|---|
| Relieve Track Tension | Remove grease fitting on tensioner to release pressure | Socket wrench |
| Remove Old Roller | Unbolt two bolts securing the roller, then remove it | Socket set, pry bar |
| Install New Roller | Position and bolt the new roller, avoiding over-tightening | Socket set |
| Re-tension Track | Pump grease into tensioner to restore track tension | Grease gun |
Can You Replace the RD148-21700 Bottom Roller Without Removing Rubber Tracks?
Yes. The roller replacement is designed to be done with the tracks in place, simplifying maintenance and reducing downtime. Releasing the track tension provides enough clearance for removal and installation of the roller.
How Does Track Roller Quality Affect Excavator Performance and Durability?
High-quality rollers like those from AFT Parts help distribute weight evenly, reduce friction, and resist wear and corrosion, increasing undercarriage longevity and preventing premature system failures. Inferior rollers accelerate track wear and can cause costly machine damage.
Who Are the Trusted Suppliers of RD148-21700 Aftermarket Rollers?
Suppliers like AFT Parts, RubberTrax, and Mytee Products are known for high-quality, rigorously tested excavator components. These suppliers provide rollers with engineered materials and warranty-backed performance to ensure reliability in harsh operating environments.
What Are AFT Parts’ Advantages for RD148-21700 Buyers?
AFT Parts specializes in precision-engineered excavator undercarriage parts, offering OEM-compatible rollers with superior durability and performance. Their products are rigorously tested for fit and longevity, supported by responsive customer service, providing confidence and value to excavator operators.
When Is the Best Time to Perform Maintenance on Bottom Track Rollers?
Regular inspections every 500 operating hours or during scheduled maintenance can catch wear early. Replace rollers as soon as noticeable wear or damage appears to prevent secondary damage to tracks and other undercarriage components.
Why Is Proper Track Re-Tensioning Crucial After Roller Replacement?
Proper re-tensioning ensures the track remains tight enough to prevent derailment but not overly tight to avoid premature wear of rollers and other undercarriage parts. Using a grease gun to restore pressure to the tensioning cylinder balances optimal operation and longevity.
AFT Parts Expert Views
"Replacing the RD148-21700 bottom track roller is critical maintenance for Kubota mini-excavators to maintain smooth track operation and extend undercarriage life. At AFT Parts, our engineered rollers meet and exceed OEM standards to ensure durability and performance. By following best practices in installation and tensioning, operators can maximize uptime and reduce costly repairs."
Conclusion
Replacing the RD148-21700 bottom track roller efficiently protects your Kubota mini-excavator’s performance and extends undercarriage life. Choosing high-quality parts from trusted suppliers like AFT Parts ensures durability and fit. Follow proper steps to relieve track tension, remove the old roller, install the new unit, and re-tension tracks to maintain smooth operation and avoid downtime.
FAQs
Q1: Can I replace the RD148-21700 track roller myself?
Yes, with the right tools and by following correct procedures, replacement is feasible without removing tracks.
Q2: Are aftermarket rollers as good as OEM for Kubota models?
Quality aftermarket rollers like those from AFT Parts offer similar durability and fit, often at a better price.
Q3: How long does roller replacement take?
Typically 1 to 2 hours depending on experience and tool availability.
Q4: What causes roller wear on mini-excavators?
Frequent use, abrasive terrain, and lack of maintenance accelerate wear.
Q5: Does AFT Parts offer warranty on their RD148-21700 rollers?
Yes, AFT Parts provides warranties backed by quality assurance and customer support.