RD118-21700 Roller Assembly

PRODUCT DETAILS

This bottom (center) roller serves as an aftermarket replacement for multiple Kubota mini excavator models. It fits popular models while offering a balance of cost-effectiveness and practicality.

I. Core Compatible Models
This roller assembly is guaranteed to fit the following Kubota models:
KX 121-3, KX 121-3SS, KX 121-3ST
KX 040-4

II. Key Advantages: Cost Savings & Easy Installation
Outstanding Value: Compared to purchasing through original Kubota dealers, this aftermarket replacement offers significant cost savings.
Simplified Installation:
No need to remove the rubber track for replacement; each roller attaches to the track frame with just two bolts, making operation quick and efficient.
Installation Note: Avoid over-tightening with impact tools to prevent component damage.

III. Functional Role & Quality Assurance
Core Function: As a key load-bearing component of the undercarriage, this roller supports the machine’s weight during travel and operation, while guiding the track for stable movement—directly impacting equipment safety and track lifespan.
Quality Design:
Features a dual-flange outer guide structure, manufactured to strict original specifications for optimal compatibility and durability.
Equipped with high-quality double-lip seals to block dirt and debris while retaining lubrication, significantly extending service life.

IV. Alternate Part Information & Special Notes
Related Part Numbers: This roller is also known as RD148-21700, corresponding to Kubota dealer part number RD118-21700.
Steel Track Compatibility: We stock a steel track-compatible version of this roller. Please specify if your machine uses steel tracks when ordering to ensure a precise fit.

V. Full Range of Undercarriage Parts
We offer a complete line of undercarriage parts for the Kubota KX 121-3 series, including:
Rubber tracks, drive sprockets, bottom rollers, top rollers, and idlers
Enabling one-stop procurement to meet all your undercarriage repair and replacement needs.
Segmentation Logic
The content is structured as: Compatibility Basics → Key Advantages → Function & Quality → Special Notes → Supporting Services. This flow guides users from verifying fitment, to understanding value, to ensuring practicality—aligning with the decision-making process of “Does it fit?” → “Is it worth buying?” → “How to purchase efficiently?”