Title:
BACK UP RING (KU-RA21121540)
Description:
Ensure reliable sealing performance in your Kubota hydraulic system with this genuine Kubota BACK UP RING (KU-RA21121540). This OEM backup ring is designed to support hydraulic O-rings by preventing seal extrusion under high-pressure conditions, helping maintain system integrity and reducing the risk of hydraulic fluid leaks. Manufactured to Kubota’s exact specifications, it provides the correct fit, durability, and performance required for demanding construction applications.
Constructed from a high-strength, oil-resistant polymer, this genuine replacement backup ring works alongside the primary hydraulic seal to improve sealing efficiency and extend service life. It is ideal for replacing worn, damaged, or distorted backup rings during hydraulic cylinder, idler, or track tensioner maintenance, helping restore factory sealing performance and minimise downtime.
Model Fitment:
This genuine backup ring is confirmed to fit the following Kubota mini excavators:
Additional applications may include other Kubota machines using the same hydraulic seal arrangement.
Application Areas
- Hydraulic cylinders
- Track adjuster assemblies
- Idler seal assemblies
- Hydraulic sealing systems
- Mini excavators
- Construction equipment
- Hydraulic system repairs
- Preventative maintenance
Part Details:
- Manufacturer: Kubota
- OEM Part Number: KU-RA21121540 / RA211-21540
- Part Name: BACK UP RING
- Alternative Description: Hydraulic Backup Ring / Seal Support Ring
- Part Type: Genuine hydraulic sealing component
- System: Hydraulic sealing / track tensioning system
- Condition: New genuine replacement part
- Function: Supports the primary hydraulic seal or O-ring, preventing extrusion under pressure and improving sealing performance.
- Manufactured to Kubota OEM specifications for precise fit, oil resistance, and long service life.
