Hydro-Gear 71906 Fan & Pulley Kit for ZT-5400 Transmissions – 8.25" Cooling Fan & 5" Drive Pulley

Part Number: 71906
Category: Hydro-Gear Lawn & Garden Equipment Replacement Parts
Type: Replacement Hydrostatic Transmission Cooling Fan & Drive Pulley Kit

The Hydro-Gear 71906 Fan & Pulley Kit is a genuine OEM replacement assembly designed for compatible Hydro-Gear ZT-5400 hydrostatic transmissions used in commercial zero-turn lawn mowers. This kit includes an 8.25-inch, eight-blade cooling fan, 5-inch drive pulley, spacer, washer, and retaining nut to support proper transmission cooling and belt-driven operation. The cooling fan helps circulate air around the transmission during operation, while the pulley transfers drive power through the mower's belt system. Designed for specified ZT-5400 configurations, the Hydro-Gear 71906 provides a replacement for worn, cracked, broken, or damaged fan and pulley components.

Product Specifications

• Part Number: 71906

• Brand: Hydro-Gear

• Product Type: Fan & Pulley Kit

• Component Type: Hydrostatic Transmission Cooling & Drive Assembly

• Part Classification: Genuine OEM Replacement Kit

• Compatible Transmission Series: Hydro-Gear ZT-5400

• Cooling Fan Diameter: 8.25"

• Cooling Fan Blade Count: 8

• Drive Pulley Diameter: 5"

• Pulley Configuration: Single Pulley

• Pulley Height: 2.5" Above Axle Centerline

• Cooling Fan Part Number: 55049

• Drive Pulley Part Number: 53179

• Spacer Part Number: 53172

• Washer Part Number: 51523

• Retaining Nut Part Number: 44133

• Nut Thread Size: 1/2"-20

• Ariens OEM Replacement Reference: 21544035

• Application: Zero-Turn Mower Hydrostatic Transmission Cooling & Drive Maintenance

• Quantity: 1 Fan & Pulley Kit

• Condition: New

Features & Benefits

• Genuine Hydro-Gear 71906 replacement fan and pulley kit

• Designed for compatible ZT-5400 hydrostatic transmissions

• Includes an 8.25-inch cooling fan with eight blades

• Features a 5-inch drive pulley for compatible belt-drive systems

• Cooling fan helps maintain airflow around the transmission

• Drive pulley supports proper transmission input operation

• Includes essential spacer and mounting hardware

• OEM replacement components provide dependable fit in specified configurations

• Suitable for replacing cracked, broken, worn, or damaged transmission components

Applications

• Select Hydro-Gear ZT-5400 hydrostatic transmissions

• Compatible Ariens commercial zero-turn mowers

• Select Gravely zero-turn mower configurations

• Compatible commercial mowers using Ariens 21544035

• Hydrostatic transmission cooling fan replacement

• Transmission input drive pulley repairs

• Commercial mower transmission maintenance

• Equipment specifying Hydro-Gear 71906 fan and pulley kits

Important Information

• Verify Hydro-Gear part number 71906 before ordering.

• This listing includes one replacement fan and pulley kit, not a complete hydrostatic transmission.

• Kit components include the 55049 cooling fan, 53179 pulley, 53172 spacer, 51523 washer, and 44133 nut.

• Features an 8.25-inch eight-blade fan and 5-inch drive pulley.

• Hydro-Gear specifies this kit for the ZT-5400 configuration with the pulley 2.5 inches above the axle centerline.

• Replaces Ariens OEM part number 21544035 in compatible applications.

• Do not confuse this kit with Hydro-Gear 71905, which uses a different pulley-height configuration.

• Other ZT-5400 configurations may require different fan and pulley kits.

• Confirm compatibility using the complete transmission model and configuration number.

• Inspect the drive belt, input shaft, and surrounding mounting hardware before installation.

• Shut off the engine, remove the ignition key, and allow moving components to stop before servicing.

• Follow the equipment manufacturer's installation and safety instructions.