Description
Overview:
This Ring, Back Up is a genuine Kubota sealing component for compact mini excavators, engineered to support and protect primary seals in high‐pressure hydraulic assemblies. Built from durable, oil‐resistant polymer, it sits alongside an O‐ring to prevent extrusion and deformation, helping the system maintain a reliable seal under load. Precisely sized to Kubota specifications, it is intended for use on machines such as the K008-3 and U10-3. It is a direct replacement for OEM No. 69191-21540 (also seen as 69191 21540), ensuring an accurate fit without modification. Suitable for routine maintenance and overhauls, this back up ring helps restore smooth operation, reduce leaks, and extend component life across key hydraulic functions on your Kubota mini excavator.
Key Features:
- Genuine Kubota part for assured fit, compatibility, and quality
- Direct replacement for OEM No. 69191-21540 to simplify sourcing and setup
- Robust polymer construction resists wear, extrusion, and hydraulic oils
- Supports O‐rings to maintain sealing integrity under pressure and temperature changes
- Helps reduce hydraulic leaks, improve reliability, and cut unplanned downtime
- Precision manufactured to Kubota tolerances for consistent performance
- Straightforward to fit during cylinder reseals or valve service, minimising downtime
- Suitable for use across Kubota K008‐series and U10‐3 platforms used on site and in landscaping
Typical Applications:
Used within hydraulic cylinder heads, glands, and valve bodies on Kubota mini excavators to prevent O‐ring extrusion. Ideal when resealing boom, dipper, or bucket cylinders, as well as control valves and auxiliary circuits. Commonly fitted during preventive maintenance to restore sealing efficiency and protect mating components.
Also known as:
Anti‐extrusion ring, seal support ring, O‐ring back‐up, hydraulic back‐up spacer, gland support ring, O‐ring anti‐extrusion support.
Fits Models:
K008, K008-3, K008-5, K0083, K0085, U10-3, U103
Alternate Part Numbers:
69191-21540, 6919121540
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