John Deere Original Equipment Gallon-Sized Hy-Gard Oil - TY6354 (4 GALLONS)

What It Is

This is John Deere’s OEM Hy-Gard hydraulic/transmission oil sold in a 4-gallon pack (TY6354). It’s designed for John Deere lawn tractors, zero-turn mowers, Gators, and compact utility tractors that require a multi-viscosity, high-viscosity-index hydraulic fluid.

Fitment & Compatibility

• Check your owner’s manual for the exact fluid spec. Hy-Gard is required for most John Deere 100-, 200-, 300-, and X-series lawn tractors, plus many Z-series zero-turns and Gator utility vehicles.
• Not interchangeable with standard motor oil. Using the wrong fluid can damage hydrostatic transmissions, pumps, or rear axles.
• OEM vs aftermarket: This is genuine John Deere fluid, not a generic substitute. If your machine is still under warranty, using OEM Hy-Gard is recommended to avoid warranty claims.
• Volume: 4 gallons covers most single-axle tractor transmission/hydraulic oil changes. For larger machines (e.g., compact tractors), verify total system capacity—some require 5+ gallons.
• No deck size or model number match needed—compatibility is purely based on fluid spec, not mower width.

Key Things to Know

• Quality: Meets John Deere’s proprietary JDM J20C and J20D specs. Excellent cold-flow properties and thermal stability for year-round use.
• Installation difficulty: Easy—just drain the old fluid, replace the filter (if applicable), and refill. No special tools required, but a funnel and drain pan help.
• Common gotcha: This is not engine oil. Do not pour it into the engine crankcase. It’s only for the transmission/hydraulic system.
• Storage: Sealed jugs have a long shelf life (5+ years). Keep them in a dry, temperature-stable area to avoid contamination.

Should You Buy It

If you own a John Deere lawn tractor, zero-turn, or Gator that calls for Hy-Gard, this 4-gallon pack is the most cost-effective way to buy genuine OEM fluid. It’s ideal for a single transmission fluid change or for topping off multiple machines. If you only need a quart or two for a small refill, buy the single-gallon jug instead.