FTG Series Air Filter Systems

System classification

The FTG series is used when large engines require high air demand combined with controlled air filtration.

Typical applications include excavators, wheel loaders, mining equipment, air compressors and other machines with high air volume requirements and increased dust exposure.

Unlike individual air filter elements, the FTG series represents a complete system consisting of housing, airflow control, pre-separation and filtration.

Cycloflow system design and pre-separation

The Donaldson FTG series operates as a two-stage Cycloflow air filtration system. The intake air is guided within the housing to create a rotational airflow.

This airflow generates centrifugal force, separating a significant portion of dust particles before they reach the filter element. This integrated pre-separation reduces the load on the main filter under continuous operating conditions.

Separated dust is discharged automatically via an integrated Vacuator™ valve, enabling continuous operation without manual cleaning of the pre-separation stage.

The remaining particles are captured by the filter element. The system design ensures uniform loading of the filter element and reduces localized stress within the filter media.

Axial seal technology and housing design

The FTG series uses an axial seal system, where the filter element is sealed along its end face against the housing.

The sealing is achieved via the housing cover, which compresses and secures the filter element axially. This design is intended for applications involving large filter elements, high airflow volumes and mechanically demanding installation environments.

The housings are typically made of metal construction and are designed for applications where mechanical stress, temperature resistance and external impact must be considered.

Technical features

• Two-stage filtration: Cycloflow pre-separation combined with downstream main filtration
• Cycloflow airflow: rotational airflow to reduce particle load on the filter element
• Vacuator™ valve: automatic dust discharge for continuous operation
• Axial seal system: stable sealing concept for large-volume filter elements
• Metal housing: designed for mechanical durability and demanding environments
• System design: suitable for continuous operation under elevated dust conditions

Applications and operating conditions

FTG air filter systems are used in applications where a combination of high airflow and two-stage filtration is required.

Typical applications include earthmoving, mining, construction sites and industrial environments with continuously elevated dust levels.

System selection is based on airflow requirements, installation space, connection geometry, mounting position and machine specifications.

System comparison within Donaldson series

The FTG series is positioned within the Donaldson air filter systems as a two-stage solution for large engines.

• FPG series: two-stage systems in compact plastic housing
• XRB series: systems for high airflow without pre-separation
• FTG series: two-stage Cycloflow systems with axial seal for large engines
• PSD series: PowerCore systems with integrated pre-separation for extreme dust conditions

The FTG series is selected when large air volumes must be processed with integrated pre-separation.

Compared to the FPG series, the FTG series is designed for larger engines and higher airflow demands. Compared to the PSD series, it represents a conventional two-stage design without PowerCore architecture.

Position within air filtration systems

The FTG series is part of the filters for construction machines and belongs to the construction machine air filters category within complete air filter systems.

It is part of the Donaldson air filter systems and is used for applications requiring high air demand combined with integrated pre-separation.

System environment and maintenance

The FTG series belongs to the construction machine air filters category. For maintenance and service, compatible air filter elements must be selected based on series designation, housing configuration and reference number.

Identification before ordering

Before ordering, the series designation, reference number, machine model and installation conditions must be verified.

Check before ordering

• FTG series designation
• Reference number of the existing system
• Machine model and series
• Installation space and connection geometry

Technical support

Selection of the appropriate FTG air filter system is based on technical system matching and the specific application requirements of the machine.