O" Ring - Buna

O" Ring - Buna

This is a Buna-N (Nitrile) rubber O-ring designed specifically as a replacement seal for hydraulic systems in concrete mixer trucks. It is primarily used as a A-Pad O-ring in Eaton 46 and 54 series hydrostatic pumps, which control the drum rotation. This seal is critical for preventing hydraulic fluid leaks within the A-Pad pump, ensuring proper pressure and responsive drum operation. It is a necessary replacement part during routine pump maintenance, rebuilds, or when addressing hydraulic system leaks to restore peak performance.

Key Features

• Made from Buna-N (Nitrile) rubber for excellent resistance to petroleum-based hydraulic fluids, oils, and greases.
• Features a 70 Shore A durometer hardness, providing a medium firmness ideal for typical hydraulic sealing applications.
• Designed as a direct replacement for A-Pad seals in Eaton 46 and 54 series hydrostatic pumps.
• Prevents fluid leaks to maintain hydraulic system integrity and pump efficiency.

Fits These Mixers

McNeilus, Terex, Con-Tech. Fits front and rear discharge concrete mixers equipped with Eaton 46 or 54 series hydrostatic pumps. This includes various models from manufacturers such as McNeilus, Terex, and Con-Tech. It is a component of the hydraulic pump's servo control system.

All measurements ± standard manufacturing tolerance.

Product descriptions are drafted with automated tools and reviewed as time allows. While we work to keep them accurate, specifications and fitment should be confirmed with a Customer Service specialist at 800-745-3414 before purchase. Found an error? Let us know and we’ll fix it.