Stens Transaxle 5-Quart Hydro Change Kit w/ 2-Filters Replaces Hydro-Gear 72750

What It Is

This is a complete hydro change kit for zero-turn mowers with Hydro-Gear ZT-2800, ZT-3100, ZT-3400, or ZT-3600 transaxles. It includes 5 quarts of 20W-50 synthetic hydro oil and two spin-on filters (replaces Hydro-Gear 72750) for a full fluid and filter swap.

Fitment & Compatibility

• Transaxle models: Works with Hydro-Gear ZT-2800, ZT-3100, ZT-3400, and ZT-3600. Not for ZT-2200 or older ZT-5400.
• Mower brands: Fits many zero-turns from Toro, Exmark, John Deere, Husqvarna, Kubota, Gravely, and Snapper that use these transaxles. Check your transaxle tag (not mower model number).
• OEM vs aftermarket: Stens is a well-known aftermarket supplier. This kit is a direct replacement for the OEM Hydro-Gear 72750 kit.
• What to measure: Ensure your transaxle uses spin-on filters (not the older cartridge style). Filter thread is 3/4-16; gasket diameter is about 3.5 inches.

Key Things to Know

• Installation: Moderate difficulty. Requires draining old oil, removing two filters, installing new ones, filling with 5 quarts, then purging air per your mower’s service manual.
• Quality: Stens is a reputable aftermarket brand; oil meets Hydro-Gear specs. Some users note the included filters are slightly shorter than OEM but seal fine and work correctly.
• Gotcha: The kit comes with 5 quarts total—enough for both transaxles on most zero-turns (2.5 quarts per side). Verify your system’s total capacity; some larger units may need extra oil.
• Don’t skip purging: After filling, run the mower at low RPM, cycle the drives forward/backward to remove air pockets. Failure to purge can cause noise or poor performance.

Should You Buy It

Buy this kit if you have a zero-turn with Hydro-Gear ZT-2800–3600 transaxles and want a convenient, cost-effective alternative to the OEM kit. It’s a good value for DIY maintenance—just be prepared for a messy job and follow air purge steps carefully. Not for older transaxles or those requiring cartridge filters.