RYOBI RY34426 String Trimmer Replacement Foam Filter

1. Introduction

This instruction manual provides essential information for the proper installation and maintenance of the RYOBI RY34426 String Trimmer Replacement Foam Filter, part number 901723001. This foam filter is a critical component designed to protect your string trimmer's engine by preventing dust and debris from entering the carburetor. Regular inspection and timely replacement of the air filter are vital for maintaining optimal engine performance, fuel efficiency, and extending the lifespan of your equipment.

2. Safety Information

Always prioritize safety when performing maintenance on power equipment. Failure to follow safety guidelines can result in personal injury or damage to the equipment.

• Disconnect Power: Before attempting any installation or maintenance, ensure the string trimmer engine is completely off and cool. Disconnect the spark plug wire to prevent accidental starting.
• Personal Protective Equipment (PPE): Wear appropriate safety glasses or goggles and gloves to protect yourself from debris and sharp edges.
• Consult Owner's Manual: Always refer to your specific RYOBI string trimmer's original owner's manual for detailed safety instructions and procedures unique to your model.
• Genuine Parts: Use only genuine RYOBI replacement parts to ensure proper fit and performance.

3. Compatibility

The RYOBI Replacement Foam Filter (Part #901723001) is designed for use with various RYOBI 4-cycle string trimmer models. Please verify your specific model number to ensure compatibility.

This filter is compatible with, but not limited to, the following RYOBI string trimmer models:

• RY34426
• RY34446
• RY34006
• RY13016 4-Cycle
• S430
• C430

If your model is not listed, consult your string trimmer's owner's manual or contact RYOBI customer support for part number identification.

4. Package Contents

Your package should contain the following item:

• 1 x RYOBI Replacement Foam Filter (Part #901723001)

5. Installation Instructions

Follow these steps carefully to replace the foam air filter in your RYOBI string trimmer:

1. Preparation: Ensure the string trimmer engine is completely off and cool. Disconnect the spark plug wire to prevent any accidental engine starts during the procedure.
2. Locate Air Filter Cover: Identify the air filter cover on your string trimmer. This is typically a plastic cover located near the carburetor, often secured by clips or screws.
3. Remove Air Filter Cover: Unclip or unscrew the air filter cover and carefully remove it to expose the old foam filter.
4. Remove Old Filter: Gently pull out the old foam filter from its housing. Take note of its orientation to ensure the new filter is installed correctly.


Image 1: The RYOBI 901723001 replacement foam filter. This filter is designed to trap dust and debris, protecting the engine.

5. Inspect Filter Housing: Before installing the new filter, inspect the air filter housing for any accumulated dust, dirt, or debris. Clean the housing thoroughly to ensure a clean environment for the new filter.
6. Install New Filter: Place the new RYOBI 901723001 foam filter into the air filter housing. Ensure it is seated correctly and fits snugly, matching the orientation of the filter you removed.


Image 2: Two RYOBI 901723001 replacement foam filters, showing their shape and texture. Proper seating ensures effective air filtration.

7. Reattach Air Filter Cover: Securely reattach the air filter cover. Ensure all clips are fastened or screws are tightened to prevent air leaks.
8. Reconnect Spark Plug: Reconnect the spark plug wire firmly to the spark plug.
9. Test: Start the string trimmer to ensure proper operation. Listen for any unusual noises and confirm that the engine runs smoothly.

6. Operating Considerations

A clean and properly installed air filter is fundamental for the efficient operation of your string trimmer. It ensures that the engine receives a consistent supply of clean, filtered air, which is crucial for proper combustion and preventing premature wear of internal engine components. Operating your trimmer with a dirty or damaged air filter can lead to reduced power, increased fuel consumption, and potential engine damage.

7. Maintenance

While the foam filter is a replacement part, regular maintenance of your string trimmer's air filtration system is essential:

• Regular Inspection: Periodically check the foam filter for signs of dirt, dust accumulation, tears, or other damage. The frequency of inspection should increase if you operate the trimmer in dusty or dirty conditions.
• Replacement Schedule: Replace the foam filter according to the maintenance schedule outlined in your string trimmer's owner's manual. If the filter appears heavily soiled or damaged, replace it immediately, even if it's before the recommended interval.
• Cleaning (if applicable): Some foam filters can be cleaned and reused. If your owner's manual specifies cleaning, use mild soap and water, rinse thoroughly, and allow the filter to air dry completely before reinstallation. Ensure no soap residue remains. However, for optimal performance and engine protection, replacement is often the preferred option.

8. Troubleshooting

If you encounter issues after replacing the foam filter, consider the following common troubleshooting steps:

• Engine Not Starting or Running Poorly: Double-check that the new filter is correctly seated within its housing and that the air filter cover is securely closed. Ensure the spark plug wire is firmly reconnected.
• Reduced Engine Power: A partially blocked or incorrectly installed filter can restrict the airflow to the engine, leading to a noticeable drop in power. Re-inspect the installation and the filter's condition.
• Excessive Smoke: While less common for a filter issue, ensure no foreign objects are obstructing the air intake or carburetor.

If problems persist after verifying the filter installation, consult your string trimmer's owner's manual for further troubleshooting or contact a qualified service technician.

9. Specifications

10. Official Product Video

The following video provides additional visual information regarding air filters that may be compatible with your RYOBI string trimmer. Please verify compatibility with your specific model using the part numbers provided in your owner's manual.

11. Warranty and Support

For specific warranty information regarding your RYOBI string trimmer or genuine replacement parts, please refer to the documentation included with your original product purchase. Warranty terms and conditions may vary.

For further assistance, technical support, or to locate authorized service centers, please visit the official RYOBI website or contact RYOBI customer service directly using the contact information provided in your product's owner's manual.