Title:
SPRING (KU-RD80921420)
Description:
Maintain correct track tension and reliable undercarriage performance with this genuine Kubota SPRING (KU-RD80921420). Kubota identifies RD809-21420 as a genuine replacement spring, and parts diagrams place it within the idler cylinder / track-frame assembly on selected Kubota mini excavators.
This heavy-duty spring works with the idler tensioning assembly to maintain the correct track tension during machine operation. Proper spring tension helps the track remain correctly positioned while the undercarriage absorbs movement and operating loads.
Model Fitment:
The KU-RD80921420 spring forms part of the idler tensioning system used on selected Kubota mini excavators. Parts catalogues specifically place this spring alongside components such as the idler cylinder, spring assembly, spring retainer, spring bolt, slotted nut and plain washer.
Reported applications include:
- Kubota KX080-3
- Kubota KX080-3 Alpha
- Kubota KX080-3T
- Kubota KX080-4
- Kubota KX080-4S / KX080-4S2
- Kubota KX080-5
Parts listings vary in the exact model designations they associate with this part, so confirm the machine’s serial number and undercarriage configuration.
Part Details:
- Manufacturer: Kubota
- OEM Part Number: KU-RD80921420 / RD809-21420
- Part Name: SPRING
- Assembly: Idler / track tensioning assembly
- Alternative Description: Idler Spring / Track Tension Spring / Undercarriage Spring
- Part Type: Genuine OEM undercarriage component
- Condition: New genuine replacement part
- Function: Provides controlled spring force within the idler tensioning mechanism to maintain proper track tension.
- OEM Specification: Manufactured to Kubota specifications for compatible excavator undercarriage assemblies.
