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FVG Cycloflow™

The FVG Cycloflow™  is a two-stage axial seal air cleaner that is typically used for large construction and mining machines in medium to heavy dust conditions.
FVG Cycloflow™ are two-stage air cleaners for large construction and mining machines


  • Allows up to 34 m3/min / 1200 cfm airflow throughput per air cleaner
  • Horizontal installation
  • Designed for large industrial and construction machines ­— crawler tractors, crane loaders, excavators, and air compressors with large engines operating in severe dust environments


  • Durable housing withstands rugged conditions
  • Built-in pre-cleaner eliminates need for external pre-cleaner in most applications
  • Extended Service and Donaldson Blue™ high efficiency filters are available

Air Cleaner Features

  • Unique, flared inlet allows maximum airflow with low restriction
  • 533.4 mm / 21 in. in body diameters
  • Two-stage air cleaning deals with very dusty environment: 
    •  Built-in louver spins air to separate up to 85% of incoming dust before it reaches the filter
    • Primary filter removes up to 99.99% of the remaining dust
  • Built-in Vacuator™ Valve collects and releases pre-cleaned dust
  • Safety filter on all models protects engine inlet during primary filter change out
  • Housing is metal and coated with a corrosion and chemical resistant polymer paint

Filter Features

  • Replacement filter choices include extended service filter, Donaldson Blue™  high efficiency filter for restriction maintenance, or a standard life filter for scheduled maintenance
This servicing information is provided as a best practices guide. It is not intended to replace or supersede the service instructions supplied by your engine or vehicle manufacturer.

1. Check the Restriction 
Check the restriction level of the air cleaner filter service indicator. Replace the filter only when the restriction level has reached the maximum recommended by the engine or equipment manufacturer or on a regular service schedule.

2. Clean Out the Vacuator™ Valve 
Remove the Vacuator Valve and clean out any dust found in the drop tube. Reinstall Vacuator Valve or replace if found worn or damaged.

Note: Make sure the valve is flexible and not inverted, damaged or plugged. Replace it if damaged or if it looks like any of these images. A damaged or missing Vacuator Valve will disrupt the designed flow of air through the air cleaner.

3. Gently Remove the Old Filter 
Shut off the engine. Loosen and retain the wing nut bolt, remove bolt and washer. Replace both if damaged or worn.

Using the metal handle, pull the dirty filter gently from the housing. Accidental bumping will shake dirt loose inside the filter housing. 

4. Visually Check the Safety Filter
Visually check the safety filter without removing it. Replace if damaged or every three primary filter changes. Also verify that the safety filter is properly seated in the housing.

If the safety filter is to be replaced, it should be done immediately or the clean air outlet should be sealed. Use a clean cloth to avoid contaminant being introduced to the engine during service.

5. Always Clean the Inside of the Housing 
Dirt left in the air cleaner housing is harmful to your engine. Use a clean, damp cloth to wipe the inside of the housing before fitting the new filter.

Block the outlet tube of the air cleaner with a small dampened towel prior to cleaning the seal surface to avoid contaminating the induction system. 

6. Clean the Gasket Sealing Surfaces 

An improper gasket seal is one of the most common causes of engine contamination. Make sure that all hardened dirt ridges are completely removed, both on the bottom and top of the air cleaner housing.

7. Inspect Your Old Filter and Check for Uneven Dirt Patterns 
Your old filter has valuable clues to dust leakage or gasket sealing problems. A dust pattern on the filter’s clean side is a sign that the old filter was not firmly sealed or that a dust leak exists. Identify the cause of any leak and rectify it before installing a new filter.


8. Inspect New Filters
Before installing the new filters, visually inspect them for shipping damage and gasket integrity. If a filter is damaged, do not install it. If desired, write the date of the filter change on the outer end of the filter end cap. 

9. Install the New Filters 
First, if you’re servicing the safety filter at this change-out, seat it properly into position before installing the primary filter. Insert new filters carefully over the center bolt, hand tighten wing nut bolt for both filters. Make sure the primary filter gasket seats evenly to create a proper seal. If you don’t have a good seal, dirty air can by-pass the filter. 

10. Ensure an Air-tight Fit on all Connections and Ducts 
Check that all clamps and flange joints are tight, as well as the air cleaner mounting bolts. Attend to any leaks immediately to avoid dirt entering your engine directly. Reset the filter service indicator.

Donaldson FVG Cycloflow™ Air Cleaners

Learn how to properly service the Donaldson FVG Cycloflow™ axial seal Air Cleaner that can be found on large off-road equipment.