Rubber tracks and wear parts are sold individually unless specified in the details. We offer free shipping across the USA when you order online and ship to a commercial address. *Some restrictions apply.
RD118-21700 Roller Assembly
This is the replacement aftermarket bottom (center) roller for the Kubota KX 121-3, KX 121-3SS, KX 121-3ST, and Kubota KX 040-4 mini excavators. Take advantage of huge savings versus purchasing through your original Kubota equipment dealer.
This bottom roller is also known as RD148-21700. These rollers are simple to change, and you can install the new rollers without removing the rubber track from the machine. There are only two bolts that attach each roller to the track frame. Do not over-tighten with an impact.
The bottom rollers support and guide the machine on the track and carry the weight of the machine while it is traveling or digging.
This Kubota bottom track roller fits the following models:
- Kubota KX 121-3
- Kubota KX 121-3 SS
- Kubota KX 121-3ST
- Kubota KX 040-4
We now stock the steel track version of these rollers so please indicate if you are running steel tracks on your mini excavator.
Kubota KX121-3 Undercarriage Parts
Here is the complete line of undercarriage parts for the Kubota KX 121-3 including the rubber track, Drive Sprocket, Bottom Rollers, Top Rollers, and Tension Idler.
Alternate Part Numbers
- Kubota Dealer Part Number: RD118-21700
Alternate Kubota Models
This bottom roller assembly (RD118-21700) is known to fit:
- Kubota KX 121-3
- Kubota KX 121-3 SS
- Kubota KX 121-3ST
- Kubota KX 040-4
Quality Kubota Parts
This dual-flange outside guide-type bottom rollers are made to original specifications and produced with high-quality double lip seals to lock dirt and debris out and lock the lubrication in for long-lasting service for your machine. These rollers are direct-fit replacement rollers designed for use on the original Kubota rubber track guide system. Guaranteed fit.
