HERCULES
Mitsubishi 05566-03520 Buffer Ring
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Mitsubishi 05566-03520 Buffer Ring is a rod buffer seal available from WQC Parts.
This listing uses Hercules part number MIT-05566-03520. Catalog description: BR-90URE-35x46x2.9.
Product Details
- Hercules part number: MIT-05566-03520
- Product type: Hydraulic sealing or repair component
- Reference brand/application: Mitsubishi
- Approximate weight: 0.005 lb
- Catalog data source: 2026 US Mobile Kit Catalog
Catalog Application Data
- Equipment type: Excavators
- Catalog page reference: 1057
Understanding This Part
- Material code URE: urethane
- Durometer: 90 (hardness value in the catalog description)
A rod buffer seal is used ahead of the primary rod seal to help manage pressure fluctuations. Match the original buffer profile and its position in the sealing arrangement; a buffer seal and a back-up ring serve different roles.
Urethane is a sealing material valued for resistance to abrasion and cutting.
Durometer describes material hardness: a higher reading means a harder material on the same scale. It is not a pressure rating.
Fitment Verification
Before ordering, confirm the MIT-05566-03520 reference against your OEM reference number, machine model, cylinder location, bore and rod size, pump/motor series, and serial-number range. Manufacturer names and part numbers are used for identification and fitment reference only. If you are unsure, compare the old parts, measurements, and parts-book callout before installation.