Genuine Hydro Gear Transmission Oil Service Kit for Lawn Mowers fits ZT2800 ZT3100 ZT3200 ZT3400 / 72750

What It Is

This is a Genuine Hydro Gear service kit (part #72750) containing 20 oz of 20W-50 synthetic transmission oil, a spin-on oil filter, and a suction gasket. It’s designed for routine oil and filter changes on Hydro Gear ZT2800, ZT3100, ZT3200, and ZT3400 transaxles found in zero-turn mowers.

Fitment & Compatibility

Before buying, confirm your mower’s transmission model—check the metal tag on the transaxle housing. This kit fits only Hydro Gear ZT2800, ZT3100, ZT3200, and ZT3400 units. It does NOT fit older or non-ZT series (e.g., EZT, G-forces). Common mower brands using these transmissions include John Deere Z-series, Toro TimeCutter, Husqvarna Z2000/Z4000, and Cub Cadet ZT1/ZT2. Measure the filter thread size (3/4-16) and o-ring diameter to ensure a match. OEM or Genuine Hydro Gear is recommended; aftermarket filters may not seal correctly.

Key Things to Know

• Quality: Genuine Hydro Gear oil is formulated for their transmissions—using cheap oil can cause seal swelling or premature wear.
• Installation difficulty: Moderate. You’ll need a drain pan, a filter wrench, and a funnel. Expect 30-45 minutes. The oil fill plug is often on top of the transaxle, so access can be tight.
• Common gotcha: Overfilling. The correct level is 1/4” below the fill plug hole with the mower on level ground. Use the entire 20 oz bottle only if the system is completely dry; otherwise, check the dipstick or plug.
• Maintenance interval: Replace every 100 hours or annually, whichever comes first. Skipping changes voids the warranty on the transmission.

Should You Buy It

If you own a zero-turn mower with a ZT2800, ZT3100, ZT3200, or ZT3400 transaxle, this kit is the correct, hassle-free way to service it. At $101, it’s pricier than generic oil but ensures proper viscosity and filter fit—worth it to avoid a $500+ transmission repair.