Hydro-Gear 72537 Hydrostatic Filter Kit for ZT-4400 Transaxles

The Hydro-Gear 72537 Hydro Filter Kit is a genuine OEM replacement filter kit designed for routine service and maintenance of Hydro-Gear ZT-4400 transmissions. Replacing your hydrostatic filters at the proper service interval helps maintain clean hydraulic oil, improve drive performance, and extend the life of your transaxle system—especially in commercial and heavy-use mowing conditions.

Replaces OEM Part Numbers

• Toro: 144-6598

• Hustler: 609200

• Bobcat: 4176891

• Bad Boy: 063-1070-00

• Ferris: 5104385X1, 5104385X1YP

Fits Transmission / Application

• Hydro-Gear ZT-4400 Transaxles

Why This Kit Matters

• OEM-quality filtration for reliable hydrostatic performance

• Helps protect internal pumps, motors, and seals from contamination

• Supports longer transaxle life and smoother operation

• Ideal for scheduled maintenance on commercial and residential zero-turn mowers

Note: Always confirm your transmission model and existing part number to ensure correct fitment before ordering.