How to Change the Hydraulic Oil in Your Scag Zero-Turn Mower

Why Hydraulic Oil Matters for Your Mower

Hydraulic oil keeps your Scag zero-turn mower running smoothly. Over time, this oil breaks down and collects dirt and debris. Changing it regularly helps your mower last longer and perform better.

What You'll Need

Before you start, gather these items:

• New hydraulic oil (check your mower's manual for the correct type and amount)
• An oil drain pan
• Wrenches or sockets that fit your mower's drain plug
• A funnel
• Clean rags or paper towels
• Jack stands or blocks (if you need to lift the mower)
• Safety glasses

Steps to Change Your Hydraulic Oil

Step 1: Prepare Your Mower

Park your mower on level ground. Turn off the engine and let it cool for a few minutes. Engage the parking brake. This keeps you safe while you work.

Step 2: Find the Drain Plug

Look at your mower's hydraulic reservoir. This is usually a metal tank on the side or underneath. Find the drain plug at the bottom. Your mower's manual shows exactly where it is.

Step 3: Drain the Old Oil

Place your drain pan under the plug. Use your wrench to loosen the drain plug slowly. Once it's loose enough, unscrew it by hand. Let all the old oil drain into the pan. This may take a few minutes.

Step 4: Clean and Replace the Plug

Wipe the drain plug clean with a rag. Check the plug's rubber seal. If it looks cracked or worn, replace it. Screw the plug back in by hand first, then tighten it with your wrench. Don't overtighten—snug is enough.

Step 5: Add New Oil

Place your funnel in the top of the hydraulic reservoir. Pour in the new hydraulic oil slowly. Check your manual for how much oil your mower needs. Fill it to the mark on the reservoir or dipstick.

Step 6: Check Your Work

Start your mower and let it run for a minute. Turn it off and wait a few minutes for the oil to settle. Check the oil level again and add more if needed.

When to Change Hydraulic Oil

Check your Scag manual for the recommended schedule. Most mowers need an oil change every 50 to 100 hours of use, or once a year—whichever comes first. If you use your mower often, you may need to change it more frequently.

Disposing of Old Oil

Never pour old hydraulic oil down the drain or into the ground. Take it to a local recycling center, auto parts store, or waste disposal facility. Many places take used oil for free.

Tips for Success

• Work in a well-lit area so you can see what you're doing
• Wear safety glasses in case oil splashes
• Keep your manual nearby to check specific details for your model
• Change the oil when the mower is cool to avoid burns
• Write down the date you changed the oil so you remember when to do it again