Learning how to winterize riding lawn mower is a crucial skill for any homeowner. Winterizing a riding mower is an annual ritual that safeguards your investment from cold-weather damage. Taking these steps each fall ensures your machine starts reliably when spring arrives.
Neglecting this process can lead to expensive repairs. Problems like stale fuel, corroded engine internals, and rodent damage are common. A few hours of work now will save you time, money, and frustration later.
This guide provides a clear, step-by-step approach. We will cover everything from fuel stabilization to proper storage. Follow these instructions to protect your mower through the off-season.
How To Winterize Riding Lawn Mower
The core winterization process involves several key systems. You must adress the fuel, engine oil, battery, and physical components. Gathering your supplies before you start makes the job smoother.
You will need fresh oil, a fuel stabilizer, an air filter, and basic tools. Always consult your owner’s manual for model-specific details. Safety first: disconnect the spark plug wire before begining any maintenance.
Gather Your Tools And Supplies
Having everything ready saves time. Here is a basic list of items you will likely need:
- Fuel stabilizer (like STA-BIL)
- Fresh engine oil and a new oil filter
- A new air filter
- Socket set, wrenches, and a screwdriver
- Fuel container for syphoning
- Battery tender or trickle charger
- Grease gun for fittings (if applicable)
- Cleaning brushes and a rag
Step 1: Clean The Mower Thoroughly
Start with a completely clean machine. Grass clippings and debris hold moisture, which causes rust. A clean mower also makes it easier to spot any leaks or damage.
Use a brush or a plastic scraper to remove caked-on grass from the deck. Hose it down, but avoid direct high-pressure spray on engine components. Let the mower dry completely before moving to the next steps.
Step 2: Stabilize Or Drain The Fuel System
This is the most critical step. Old gasoline left in the system will break down and form gummy deposits. These deposits can clog the carburetor jets and fuel lines.
You have two reliable options: stabilization or draining. The best method often depends on your mower’s design and your preference.
Option A: Using A Fuel Stabilizer
This is the most common and convenient method. Add a high-quality fuel stabilizer to a nearly full gas tank. Run the engine for 5-10 minutes to circulate the treated fuel throughout the entire system.
This coats the internal parts and prevents the fuel from degrading. It is effective for most modern mowers stored in a dry place.
Option B: Draining The Fuel System
For long-term storage or older equipment, draining is very effective. You can drain the gas tank and the carburetor bowl. Run the engine until it stalls to use up any remaining fuel in the lines.
This method leaves the system empty, eliminating any chance of fuel-related issues. Be sure to dispose of old gasoline properly at a recycling center.
Step 3: Change The Engine Oil And Filter
Never store an engine with dirty oil. Used oil contains contaminants and acids that can corrode engine bearings and internal surfaces over the winter.
Run the engine for a few minutes to warm the oil, making it easier to drain. Then, using the correct tools, drain the old oil and replace the oil filter. Refill with the type and amount of oil specified in your manual. This gives you a fresh start in the spring.
Step 4: Service The Air Filter And Spark Plug
A clean air filter ensures proper airflow, which is vital for starting. Remove the air filter and inspect it. If it’s a paper filter, replace it. If it’s a foam filter, you can wash it in soapy water, let it dry, and re-oil it according to the instructions.
Check the spark plug as well. Remove it and inspect the electrode. If it’s worn or heavily carboned, replace it with a new one of the correct type. Gapping the plug correctly is important for a strong spark.
Step 5: Remove And Maintain The Battery
A dead battery is the top reason for spring starting failures. Cold temperatures can permanently damage a discharged battery. The best practice is to remove the battery entirely.
Disconnect the negative (black) cable first, then the positive (red). Clean the terminals with a baking soda solution if they are corroded. Store the battery in a cool, dry place off concrete floor. Connect it to a battery tender or trickle charger to maintain a full charge over winter.
Step 6: Lubricate Moving Parts
Protect the mower’s mechanical parts from seizing. Apply grease to all zerks fittings on the steering linkage and spindle bearings. Lubricate the clutch and brake pedal pivots with a light oil.
Also, consider applying a thin film of oil to any exposed metal cables. This prevents rust and keeps controls operating smoothly.
Step 7: Prepare The Mower Deck And Blades
Inspect the mower deck for damage and wear. Sharpen or replace the blades now, so you’re ready for the first cut. Dull blades tear grass, making it more susceptible to disease.
After sharpening, balance the blade to prevent vibration. You can spray the underside of the clean, dry deck with a silicone spray to prevent rust and make future cleanings easier.
Step 8: Choose The Right Storage Location
Where you store the mower matters. An unheated garage or shed is ideal. The space should be dry and protected from the elements. Avoid damp basements which promote rust.
If you must store it outdoors, use a waterproof cover that breathes. A plastic tarp can trap moisture underneath, leading to condensation and mold. Make sure the cover is secure.
Final Pre-Storage Checklist
Before you cover the mower for the season, run through this final list:
- Fuel system is stabilized or drained
- Fresh oil and filter installed
- Clean air filter in place
- Battery is removed and on a maintainer
- Tires are inflated to proper pressure
- Parking brake is released (to prevent spring sticking)
- Mower is clean and dry
- No tools or rags are left on or near the engine
Common Winterization Mistakes To Avoid
Even with good intentions, it’s easy to make errors. Being aware of these common pitfalls helps you avoid them. Here are a few mistakes that can compromise your winterization efforts.
Leaving Old Gasoline In The Tank
This is the number one mistake. Untreated gasoline begins to break down in as little as 30 days. It forms varnish that clogs small passages in the carburetor. Always use a stabilizer or drain the system completely.
Forgetting To Disconnect The Battery
Leaving the battery connected allows for a slow parasitic drain. In cold weather, a partially charged battery can freeze and crack its case. Always remove it and keep it charged.
Storing With Flat Tires
Letting tires go flat over the winter can cause sidewall cracking and permanent flat spots. Inflate them to the recommended pressure. Consider placing the mower on blocks to take weight off the tires if storing for many months.
Neglecting The Fuel Shut-Off Valve
If your mower has a fuel shut-off valve, use it. Turn it to the “off” position after you run the stabilizer through the system. This provides an extra layer of safety against fuel leaks.
Frequently Asked Questions
How Long Does It Take To Winterize A Riding Lawn Mower?
For someone familiar with the process, it typically takes 1 to 2 hours. If it’s your first time, allow 2 to 3 hours to complete all steps carefully. Rushing can lead to missed steps.
Can I Just Use A Fuel Stabilizer And Be Done?
While fuel stabilization is vital, it is only one part of the process. For full protection, you should also change the oil, service the air filter, and remove the battery. The stabilizer alone won’t prevent other cold-weather issues.
Is It Better To Drain Gas Or Use Stabilizer?
Both methods are effective. Using a stabilizer is easier and recommended for modern mowers with plastic tanks and complex fuel systems. Draining is a foolproof method for very long storage or simpler engines. Choose the method you are most comfortable performing correctly.
Should I Change The Oil In The Fall Or Spring?
It is better to change the oil in the fall. This removes acidic contaminants from the engine before they can sit and cause corrosion all winter. Starting spring with fresh oil is a bonus.
What If I Forgot To Winterize My Mower?
If you forgot, try to winterize it as soon as you remember, even if it’s mid-winter. Stabilize the fuel if possible and remove the battery. In the spring, you may need to drain the old gas and clean the carburetor before it will start.