Hydro Gear OEM 72537 Transmission Filter Kit Service your ZT-4400 hydro system with this genuine Hydro Gear OEM 72537 transmission filter kit. This kit is used on select Toro, Hustler, and Bobcat machines and includes the filter plus both O-rings needed for a proper hydro service on one transmission. ⚠️ Before You Order – Verify Fitment This filter kit fits select machines equipped with a Hydro Gear ZT-4400 transmission. Fitment can vary by model and application, so do not order by appearance alone. Important: This kit is designed for one transmission only. Most dual-hydro zero-turn mowers will require 2 kits for a complete hydro service. Not sure? Contact us with your brand, model, and serial number and we’ll help verify fitment. Sold as 1 kit. Includes 1 filter and 2 O-rings. Order quantity 2 if servicing both transmissions on most zero-turn mowers. What This Part Does Filters hydrostatic transmission oil on Hydro Gear ZT-4400 systems Helps support proper hydro performance and routine service intervals Includes the O-rings needed for filter replacement service Genuine OEM Hydro Gear replacement part Part Details Brand: Hydro Gear Part Number: 72537 Replaces / Cross References: Toro 144-6598, Hustler 609200, Bobcat 4176891 Product Specifications Length: 3.00 in. Width: 2.750 in. Height: 2.750 in. Weight: 0.214 lb Fits Select Hydro Gear / Toro / Hustler / Bobcat Models Transmission Application: Hydro Gear ZT-4400 Hydro-Gear ZT-4400 Select Toro zero-turn models Select Hustler zero-turn models Select Bobcat zero-turn models Known Listed Model References Toro: 74000, 74002, 74004, 74035, 74050, 74052, 74054, 74055, 74057 Hustler: 943803, 943795, 943787, 943845, 943837, 943829, 943811, 943797, 941971, 941930, 941922, 941898, 941880, 941872, 941864, 941856, 941831 Bobcat: ZT6000, ZT6100 Important Fitment Notes This kit is for one transmission, not a complete mower kit Most machines with dual hydros will require 2 kits for a full service Fits listed applications using the Hydro Gear ZT-4400 transmission Verify machine model and serial number before ordering to avoid fitment issues Recommended Oil Toro: 114-4713 Hypr-Oil 500 Quart Toro: 114-4714 Hypr-Oil 500 Gallon Hustler: 606950X Hydrostatic Transmission Oil Quart Hustler: 606951X Hydrostatic Transmission Oil Gallon Listed Oil Capacity: 1 gallon per transaxle
