Keeping your Murray lawn mower in peak operating condition requires regular maintenance, and one of the most critical components to monitor is the air filter. This essential part prevents dirt, debris, and contaminants from entering the engine, ensuring optimal performance and longevity. A properly functioning air filter maintains clean air intake, allows for optimal combustion, improves fuel efficiency, and prevents damage that can lead to costly repairs . For Murray lawn mower owners, understanding how to select, install, and maintain the correct air filter is fundamental to preserving your equipment's value and functionality.

Murray mowers typically use either paper or foam air filters, with some models featuring dual-element designs that combine both materials . The specific filter your Murray mower requires depends on factors including the engine model, manufacturing year, and deck size. Proper maintenance schedules vary based on usage conditions, but most manufacturers recommend inspection or replacement at least once per mowing season .

Why Your Murray Lawn Mower's Air Filter Matters

The air filter serves as your mower's first line of defense against airborne contaminants. Without an effective filtration system, dirt, grass clippings, and debris would enter the combustion chamber, where they can cause abrasive damage to engine components. This contamination leads to reduced engine efficiency, increased fuel consumption, and potentially complete engine failure over time .

A clogged or dirty air filter restricts airflow to the engine, disrupting the critical air-fuel mixture required for proper combustion. When this ratio becomes imbalanced, your Murray mower may experience noticeable symptoms including hard starting, rough idling, black smoke from the exhaust, loss of power during operation, and increased fuel consumption . In severe cases, a completely blocked filter can cause the engine to stall entirely or fail to start.

Regular air filter maintenance extends beyond just performance issues. By preventing abrasive particles from entering the engine, a quality air filter protects internal components from premature wear. This protection significantly extends your Murray mower's operational lifespan, potentially saving you from expensive engine repairs or premature replacement of the entire machine .

Identifying the Correct Air Filter for Your Murray Mower

Finding the right replacement filter begins with identifying your specific Murray mower model. Murray produces various walk-behind and riding mower models with different engine specifications, each requiring particular air filter types. The model number is typically located on a decal or metal plate on the mower deck or frame .

Once you have identified your mower model, you can cross-reference it with compatible air filters. Murray lawn mowers often use Briggs & Stratton engines, which have specific filter requirements. For instance, the Murray MXMH850EX model is compatible with filters designed for Briggs & Stratton part numbers 795066 and 796254 . Other Murray models may use different filters, such as those matching replacement numbers 496894S or 493909 .

Physically measuring your existing filter can also help ensure compatibility. Air filters for Murray mowers come in specific dimensions. For example, some models use filters with dimensions measuring 5.5 inches in length, 2.75 inches in width, and approximately 2.125 inches in height, while others may have different specifications . Having these measurements when purchasing a replacement helps verify proper fitment.

When selecting a new air filter, you'll typically choose between paper, foam, or dual-element filters. Paper filters are common, cost-effective, and designed for replacement rather than cleaning. Foam filters are washable and reusable, offering long-term economy for those willing to perform regular maintenance. Dual-element filters provide enhanced filtration with both foam and paper elements working together for optimal protection in dusty conditions .

Step-by-Step Guide to Replacing Your Murray Lawn Mower Air Filter

Replacing your Murray mower's air filter is a straightforward process that requires minimal tools and mechanical experience. Follow these steps for a proper replacement:

​1. Safety Preparation: Begin by turning off the mower and allowing the engine to cool completely if it has been running recently. For ultimate safety, disconnect the spark plug wire to prevent any possibility of accidental starting during the maintenance process .

​2. Locate the Air Filter Housing: On most Murray walk-behind mowers, the air filter housing is a plastic or metal cover positioned on the side of the engine. For riding mowers, the housing is typically found on top of the engine under a larger cover. The cover is usually secured with screws, clips, or a single wing nut for tool-free removal .

​3. Remove the Old Filter: Carefully loosen and remove the fasteners securing the housing cover. Once the fasteners are removed, lift the cover away to reveal the air filter inside. Gently pull the old filter straight out, being careful not to dislodge any accumulated debris into the intake opening .

​4. Clean the Housing: Before installing the new filter, take a moment to clean inside the filter housing. Use a clean cloth or a small brush to remove any dirt, grass clippings, or debris that may have accumulated. A clean housing ensures optimal performance of your new filter and prevents contamination from entering the engine .

​5. Install the New Filter: Position the replacement filter in the housing, ensuring it sits evenly and snugly in the compartment. Pay attention to any orientation markings on the filter, as improper installation can allow unfiltered air to bypass the filter element. The filter should fit securely without any gaps around the edges .

​6. Reassemble: Replace the housing cover and securely fasten all screws, clips, or wing nuts. A proper seal is essential to prevent contaminants from entering around the filter edges. Finally, reconnect the spark plug wire if you disconnected it for safety .

Maintenance Tips for Prolonging Your Air Filter's Life

Regular inspection and maintenance significantly extend your air filter's service life and ensure optimal engine protection. The frequency of maintenance depends largely on your mowing conditions. For typical residential lawns, inspect your air filter every 25 hours of operation or approximately once per month during peak mowing season. If you mow in particularly dusty conditions or frequently cut dry grass, more frequent checks are advisable .

​Maintaining Paper Air Filters: Paper filters cannot be effectively cleaned and should be replaced when dirty. Hold the filter up to a light source—if you cannot see light through the pleats, replacement is necessary. Never attempt to wash a paper filter, as water damages the filtration material and compromises its effectiveness. When in doubt, err on the side of replacement, as paper filters are relatively inexpensive compared to the potential cost of engine damage .

​Maintaining Foam Air Filters: Foam filters can be cleaned and reused multiple times before replacement becomes necessary. To clean a foam filter, wash it in warm water with a mild detergent, gently squeezing (not wringing) the foam until the water runs clear. After cleaning, allow the filter to air dry completely, then apply a small amount of clean engine oil distributed evenly throughout the foam. Gently squeeze out any excess oil before reinstalling . A useful tip for oiling foam filters is to place the filter in a plastic bag with a small amount of oil, then gently squeeze the bag to distribute the oil evenly without making a mess .

​Dual-Element Filter Maintenance: For filters combining foam and paper elements, separate the components for individual maintenance. The foam pre-cleaner can be washed and re-oiled following the same process as a standard foam filter. The paper inner filter should be inspected and replaced according to the guidelines for paper filters .

Always consult your Murray mower's owner's manual for specific maintenance recommendations tailored to your particular model. Additionally, proper storage practices—keeping your mower in a clean, dry environment—can significantly reduce unnecessary exposure to elements that degrade air filter quality .

Troubleshooting Common Air Filter Issues

Even with proper maintenance, air filter-related issues can occasionally arise. Recognizing the symptoms early can prevent more significant problems:

• ​Difficulty Starting: If your Murray mower struggles to start, a clogged air filter may be restricting airflow enough to affect the air-fuel mixture. Check the filter condition and replace if necessary .

• ​Reduced Power or Rough Operation: When a mower loses power during operation or runs unevenly, a dirty filter may be the culprit. This is particularly likely if the problem develops gradually over time .

• ​Black Exhaust Smoke: Dark smoke from the exhaust often indicates an overly rich fuel mixture, which can result from insufficient airflow due to a clogged filter .

• ​Excessive Fuel Consumption: If you notice your mower is using more fuel than usual, the engine may be working harder to compensate for restricted airflow .

• ​Dirt Bypass Evidence: If you find dirt inside the air filter housing or on the clean side of the filter, the seal may be compromised, or the filter may be damaged, allowing unfiltered air to enter the engine.

For persistent issues after filter replacement, consider whether other factors might be contributing to the problem, such as a dirty carburetor, old gasoline, or spark plug issues. In some cases, professional service may be necessary to diagnose and address underlying engine problems .

Frequently Asked Questions About Murray Lawn Mower Air Filters

​How often should I replace the air filter on my Murray lawn mower?​​
For paper filters, replacement is typically needed at least once per mowing season, or after approximately 25 hours of operation. Foam filters can be cleaned every 25 hours and replaced when they show signs of deterioration, such as tearing or brittleness. Always consult your owner's manual for specific recommendations based on your Murray model .

​Can I use my Murray mower without an air filter temporarily?​​
No. Operating your mower without an air filter, even briefly, can allow dirt and debris to enter the engine, potentially causing significant damage. Always ensure a proper filter is installed before starting your mower .

​Where can I find the correct air filter for my specific Murray mower model?​​
Replacement air filters are available through various sources, including Murray dealerships, home improvement stores, garden centers, and online retailers. When purchasing, have your mower's model number and manufacturing date available to ensure compatibility .

​Why does my new air filter seem dirty already after just a few uses?​​
Rapid filter clogging typically indicates extremely dusty mowing conditions or possibly a storage issue. If this occurs frequently, consider increasing your maintenance frequency or inspecting the air filter housing for leaks that might be allowing unfiltered air to enter .

​What is the difference between OEM and aftermarket air filters?​​
OEM (Original Equipment Manufacturer) filters are produced by Murray or their contracted manufacturers specifically for your mower. Aftermarket filters are produced by third-party companies. While OEM filters guarantee exact compatibility, high-quality aftermarket filters can offer equivalent performance, sometimes at a lower cost. The Annolai Timemaster Air Filter, for instance, is noted for its precise OEM fit for compatible Murray models despite being an aftermarket option .

Proper air filter maintenance is one of the simplest yet most impactful ways to protect your Murray lawn mower's engine and ensure years of reliable service. By selecting the correct filter, following proper replacement procedures, and adhering to a consistent maintenance schedule, you can maintain optimal performance, improve fuel efficiency, and extend the life of your valuable outdoor power equipment.