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Description
The Hydro-Gear 72101 Hub Kit (4-Bolt) is a genuine OEM drivetrain component designed to securely connect the wheel assembly to Hydro-Gear transmission systems. This hub plays a critical role in transferring power from the hydrostatic transmission to the drive wheels, ensuring smooth traction, stability, and consistent mower performance.
Engineered to Hydro-Gear’s strict OEM standards, the 72101 hub kit features a durable, precision-machined construction that provides a secure fit and long-lasting reliability under demanding operating conditions. The 4-bolt configuration ensures strong wheel attachment and proper alignment for optimal drivetrain efficiency.
Key Details:
Manufacturer: Hydro-Gear
Manufacturer Part Number: 72101
Part Type: Hub Kit (4-Bolt)
Function: Connects transmission output shaft to wheel assembly
Bolt Pattern: 4-bolt design
Material: Heavy-duty, precision-machined steel
Installation: Direct OEM replacement kit
Compatibility:
The Hydro-Gear 72101 Hub Kit is used on select Hydro-Gear transmission systems commonly found in:
Zero-turn mowers (ZT-2200, ZT-2800, ZT-3100 series)
Residential and commercial lawn equipment with Hydro-Gear drives
Brands such as Gravely, Ariens, Scag, Exmark, and others using Hydro-Gear transmissions
(Compatibility depends on transmission model and axle configuration—verify before installation.)
Who is this for?
Ideal for homeowners, landscapers, and technicians repairing or maintaining Hydro-Gear-driven equipment that requires a reliable wheel hub connection.
Property Size (Acre):
Suitable for all property sizes, especially medium to large areas where zero-turn mowers are commonly used.
Pros:
Genuine Hydro-Gear OEM component
Strong 4-bolt mounting design
Ensures proper power transfer to wheels
Durable construction for long service life
Direct-fit replacement for compatible systems
Cons:
Only compatible with specific Hydro-Gear models
Installation may require mechanical tools and experience
Not a universal hub
Comparison (vs aftermarket hub kits):
Compared to aftermarket alternatives, the Hydro-Gear 72101 Hub Kit offers precise OEM fitment, correct bolt alignment, and dependable durability. Aftermarket hubs may vary in tolerances, potentially affecting fit and long-term performance.
Why buy from Barry’s?
Barry’s supplies genuine Hydro-Gear OEM parts to ensure correct fitment and long-term reliability. With expert support and dependable inventory, Barry’s helps keep your equipment operating at peak performance.

