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Description
70921 – Hydro-Gear Breather Cap & Vent Kit (Genuine OEM Hydro-Gear Part)
The Hydro-Gear 70921 Breather Cap and Vent Kit is a genuine OEM service component designed to maintain proper ventilation and sealing in Hydro-Gear transmission and hydraulic reservoir systems. This kit includes a large breather cap with integrated vent, which is essential for regulating internal pressure and protecting the hydraulic system from contamination.
Engineered by Hydro-Gear, this breather cap allows controlled airflow into the transmission or reservoir while preventing dirt, debris, and moisture from entering the system. Proper venting is critical to ensure smooth hydraulic operation, prevent pressure buildup, and maintain consistent fluid performance in hydrostatic drive systems.
Manufactured from high-quality, durable materials, the 70921 kit is built to withstand exposure to hydraulic fluids, temperature changes, and demanding operating conditions commonly found in commercial and residential equipment.
Key Details:
Manufacturer: Hydro-Gear
Part Number: 70921
Product Name: Breather Cap & Vent Kit
Part Type: Hydraulic reservoir/transmission vented cap
Function: Regulates internal pressure and prevents contamination
Design: Integrated breather vent for controlled airflow
Material: High-strength plastic with internal vent components
Application: Hydrostatic transmissions and hydraulic reservoirs
Installation: Direct OEM replacement for Hydro-Gear systems
Compatibility:
The Hydro-Gear 70921 Breather Cap & Vent Kit is designed for use in:
Hydro-Gear hydrostatic transmissions and transaxles
Hydraulic reservoir systems in zero-turn mowers
Commercial and residential lawn equipment equipped with Hydro-Gear drives
Commonly found in equipment from brands such as:
Scag
Gravely / Ariens
Exmark
Toro
Hustler
As a genuine Hydro-Gear OEM component, the 70921 breather cap and vent kit ensures proper system ventilation, protects against contamination, and supports long-term reliability and performance of hydrostatic transmission systems.

