Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Fleetguard AF253 Primary Air Filter. Adhering to these instructions will help ensure optimal performance and longevity of your equipment's air filtration system.

Image: Fleetguard AF253 Primary Air Filter. This cylindrical filter features a robust mesh exterior protecting the pleated filter media, designed for efficient air intake filtration.
Setup and Installation
Proper installation is crucial for the effective operation of the air filter. Always refer to your equipment's service manual for specific instructions and safety precautions.
- Safety First: Ensure the equipment is turned off and cooled down before beginning any installation or maintenance. Disconnect power if applicable.
- Locate Air Filter Housing: Identify the air filter housing on your equipment.
- Remove Old Filter: Carefully open the housing and remove the old air filter. Note its orientation for correct installation of the new filter. Dispose of the old filter responsibly.
- Clean Housing: Inspect the air filter housing for any debris, dust, or contaminants. Clean the housing thoroughly to prevent contamination of the new filter.
- Install New Filter: Insert the Fleetguard AF253 Primary Air Filter into the housing, ensuring it seats correctly and forms a tight seal. Verify that the filter's ends are properly aligned with the housing's inlet and outlet.
- Secure Housing: Close and secure the air filter housing according to the equipment manufacturer's specifications. Ensure all clamps or fasteners are tightened to prevent air leaks.
- Check for Leaks: After installation, visually inspect the housing for any gaps or improper seals.
Note: Optional gaskets may be required for specific Fram Housing applications. Consult your equipment's manual or a qualified technician if unsure.
Operating Principles
The Fleetguard AF253 Primary Air Filter is designed to protect your engine by filtering airborne contaminants such as dust, dirt, and debris from the intake air. Clean air is essential for efficient combustion, optimal engine performance, and extended engine life. During operation, air is drawn through the filter media, which traps harmful particles before they can enter the engine's combustion chambers.
Maintenance
Regular inspection and timely replacement of the air filter are critical for maintaining engine health and efficiency.
- Inspection Frequency: Inspect the air filter at intervals recommended by your equipment manufacturer. In dusty or harsh environments, more frequent inspections may be necessary.
- Visual Check: Look for signs of dirt accumulation, damage, or tears in the filter media. A heavily soiled filter will appear dark and clogged.
- Replacement: Replace the Fleetguard AF253 Primary Air Filter when it shows signs of heavy contamination, damage, or at the intervals specified in your equipment's service manual. Do not attempt to clean and reuse a primary air filter, as this can compromise its filtration efficiency and potentially damage the engine.
- Secondary Filter: If your system includes a secondary air filter, ensure it is also inspected and replaced as per manufacturer guidelines.
Troubleshooting
A clogged or damaged air filter can lead to various performance issues. Consider checking your air filter if you experience any of the following:
- Reduced Engine Performance: A restricted air filter can starve the engine of air, leading to a noticeable decrease in power and acceleration.
- Increased Fuel Consumption: An engine struggling for air may consume more fuel to maintain performance.
- Unusual Engine Noises: A severely clogged filter can sometimes cause the engine to make unusual sounds due to altered air intake.
- Visible Smoke from Exhaust: In some cases, an air-starved engine might produce black smoke from the exhaust.
If these symptoms occur, inspect the AF253 filter and replace it if necessary. If symptoms persist after filter replacement, consult a qualified technician.
Specifications
Key dimensions and features of the Fleetguard AF253 Primary Air Filter:
| Overall Height | 306.27 mm (12.058 in) |
| Overall Outer Diameter (OD) | 264.21 mm (10.402 in) |
| End 1 Inner Diameter (ID) | 198.07 mm (7.798 in) |
| End 2 Inner Diameter (ID) | 11.1 mm (0.437 in) |
| Model Number | AF253 |
| Brand | Fleetguard |
| Item Weight | 2 pounds |
| Product Dimensions | 13.98 x 12.6 x 12.6 inches |
| Fit Type | Vehicle Specific Fit |
Note: Dimensions are approximate and may vary slightly. Always verify compatibility with your specific equipment.
Warranty Information
Fleetguard products are manufactured to high-quality standards. For detailed warranty information regarding the AF253 Primary Air Filter, please refer to the official Fleetguard website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
Customer Support
If you have any questions, require technical assistance, or need further information about the Fleetguard AF253 Primary Air Filter, please contact Fleetguard customer support through their official channels. You can typically find contact information on the Fleetguard website or product packaging.