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Drum Blower Series D825 / D925 – Bi-Lobe Dry Bulk Truck Blowers

Gardner Denver is proud to be an industry leader and innovator with the widest selection of dry bulk blower solutions. Each solution is designed to efficiently load and unload dry bulk pneumatic trailers, ensuring durable and effective performance for dry bulk applications.

The D825 and D925 rotary lobe truck blowers are some of the most durable and versatile in the industry. Fitting a D825/D925 on your tractor means it will be ready to do virtually any job necessary.

 

  • Designed for reliable continuous‑duty operation in demanding applications
  • Helps reduce noise, heat, and component wear
  • Supports flexible installation across different truck configurations
  • Improves operational safety through built‑in thermal and pressure protection
  • Simplifies ownership with serviceability and local support
  • Oil lubrication at both ends of the blower supports bearing life and consistent performance under continuous‑duty operating conditions
  • Efficient bi-lobe rotor design for cooler operation
  • Twin drive shaft construction supports bi‑directional rotation and maintains shaft alignment for long‑term durability
  • Heat‑dissipation ribbing on the blower body, end plates, and gear cases helps manage operating temperatures and reduce component stress during extended unloading cycles

 

With the broadest product offering in the industry, Gardner Denver guarantees that, no matter your requirements, we have a solution for you. Gardner Denver is proud of our history of industry leading, high performance rotary lobe blowers for mobile dry bulk conveying applications.

Over‑temperature and over‑pressure protection

Multiple drive options: PTO, belt, or hydraulic

Diamond port design reduces airflow pulsation and noise

Simple installation with Gardner Denver mounting kits

Packaged unit options for on‑site product transfer

Local support through Gardner Denver’s distributor network

History

  • 1980 - Introduced bi‑lobe blower technology for mobile applications with the launch of the D800 in the U.S., developed by Gardner Denver’s UK facility.
  • 1991 - Expanded performance capabilities by increasing blower delivery to 18 psi and 17 in Hg, becoming the first straight‑lobe blower to achieve this combination.
  • 1997 - The D807 blower was launched as the first straight-lobe blower to achieve 20psi continuous pressure, implemented the infamous diamond shaped port for reduced pulsation/noise and added cooling fins/reinforcing ribs for added strength. The larger, D907 model was also introduced for higher flow application requirements.
  • 2026 - Updated D825/D925 models launched with features implemented to increase bearing life, while also improving the D925 capabilities with a higher continuous pressure rating of 19psi and adding bi-directional rotation abilities.

The Drum Series D825 / D925 is well suited for a wide range of dry bulk pneumatic conveying applications, including:

  • Cement and lime
  • Sand and aggregates
  • Sugar and food-grade granules
  • Pebble lime
  • Plastic pellets
  • Agricultural products and feed

D825 Performance Specifications

Pressure Performance (PSI)

Pressure (PSI)

1800 RPM

2000 RPM

2200 RPM

2400 RPM

2600 RPM

2800 RPM

3000 RPM

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

2

568 / 6.0

640 / 6.7

705 / 7.3

776 / 8.0

841 / 8.6

916 / 9.4

983 / 10.0

6

521 / 16.8

590 / 18.7

663 / 20.7

732 / 22.6

799 / 24.4

873 / 26.4

940 / 28.2

10

495 / 27.9

561 / 30.8

628 / 33.8

706 / 37.3

766 / 39.9

840 / 43.2

911 / 46.4

14

466 / 38.4

543 / 43.4

605 / 47.1

673 / 51.3

749 / 56.1

811 / 59.8

883 / 64.3

18

447 / 49.5

516 / 55.0

582 / 60.1

651 / 65.6

728 / 71.8

792 / 76.8

861 / 82.3

20

437 / 54.9

506 / 60.9

582 / 67.8

646 / 73.2

717 / 79.6

782 / 85.3

855 / 91.7

 

Vacuum Performance (in Hg)

Vacuum (in Hg)

1800 RPM

2000 RPM

2200 RPM

2400 RPM

2600 RPM

2800 RPM

3000 RPM

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

2

583 / 3.2

651 / 3.5

718 / 3.9

789 / 4.2

856 / 4.6

928 / 5.0

1000 / 5.3

6

547 / 8.6

610 / 9.4

682 / 10.4

756 / 11.4

820 / 12.3

892 / 13.3

956 / 14.2

10

514 / 14.0

576 / 15.3

652 / 17.0

717 / 18.5

785 / 20.0

857 / 21.6

931 / 23.3

14

476 / 19.3

544 / 21.4

611 / 23.4

684 / 25.7

752 / 27.8

818 / 29.8

895 / 32.2

17

443 / 23.4

511 / 25.9

576 / 28.2

653 / 31.2

717 / 33.5

785 / 36.0

853 / 38.6

 

D925 Performance Specifications

Pressure Performance (PSI)

Pressure (PSI)

1700 RPM

1800 RPM

2000 RPM

2200 RPM

2400 RPM

2600 RPM

2800 RPM

3000 RPM

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

2

699 / 7.3

752 / 7.8

841 / 8.6

936 / 9.5

1025 / 10.4

1113 / 11.2

1204 / 12.0

1302 / 13.0

6

645 / 21.0

685 / 22.1

779 / 24.6

872 / 27.1

969 / 29.7

1063 / 32.2

1150 / 34.6

1243 / 37.1

10

603 / 34.6

649 / 36.6

739 / 40.6

830 / 44.6

923 / 48.7

1016 / 52.8

1114 / 57.2

1197 / 60.8

14

566 / 47.9

621 / 51.4

713 / 57.1

806 / 62.8

893 / 68.1

990 / 74.2

1075 / 79.5

1168 / 85.1

16

554 / 54.8

602 / 58.2

693 / 64.6

785 / 71.1

874 / 77.3

975 / 84.7

1064 / 90.9

1150 / 96.8

19

534 / 65.0

581 / 69.0

672 / 76.6

769 / 84.8

854 / 91.8

949 / 99.7

1039 / 107.2

1136 / 115.4

 

Vacuum Performance (in Hg)

Vacuum (in Hg)

1700 RPM

1800 RPM

2000 RPM

2200 RPM

2400 RPM

2600 RPM

2800 RPM

3000 RPM

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

CFM / HP

2

725 / 3.9

771 / 4.1

864 / 4.6

953 / 5.0

1047 / 5.5

1143 / 5.9

1231 / 6.4

1326 / 6.8

6

674 / 10.6

717 / 11.1

810 / 12.4

902 / 13.7

998 / 14.9

1087 / 16.1

1175 / 17.3

1274 / 18.7

10

627 / 17.2

677 / 18.3

771 / 20.4

857 / 22.3

948 / 24.3

1046 / 26.5

1134 / 28.4

1224 / 30.4

14

579 / 24.0

623 / 25.3

715 / 28.1

811 / 31.1

902 / 33.9

996 / 36.7

1088 / 39.6

1181 / 42.4

17

534 / 29.0

581 / 30.8

673 / 34.2

766 / 37.6

856 / 40.9

948 / 44.3

1042 / 47.8

1132 / 51.2

 

D825 vs. D925 Rotary Lobe Truck Blowers

Specification

D825

D925

Maximum Continuous Pressure

20 PSIG

19 PSIG

Maximum Vacuum

17 in Hg

17 in Hg

Flow Range

390 – 1,000 CFM

535 – 1,340 CFM

Operating Speed Range

1,800 – 3,000 RPM

1,700 – 3,000 RPM

Minimum Inlet Temperature

‑40°F

‑40°F

Dry Weight

342 lbs

404 lbs

Shaft Diameter

1‑5/8 in

1‑5/8 in

Gardner Denver Mobile Products Brochure

1.7 MB, PDF

Dry Bulk Conveying Solutions Brochure

11 MB, PDF

Gardner Denver offers a complete range of factory-engineered accessories and genuine replacement parts for the Drum Series, including:

  • Stainless steel inlet filters
  • Truck blower overhaul kits
  • Relief valves
  • Genuine Gardner Denver lubricants
  • Complete installation kits (mounting brackets, silencers, filters)
  • Silencers in stainless steel or carbon steel

 

All genuine parts are factory engineered to the exact specifications of our machines, this means you get maximum performance from our blowers and compressors.

Downtime is costly. Gardner Denver supports the Drum Series D825 / D925 through a nationwide network of factory-trained distributors and certified technicians available 24/7.Support includes:

  • Globally stocked genuine spare parts
  • Service and maintenance kits
  • Commissioning and system inspections
  • Professional maintenance and service contracts
  • Customer and dealer service training
  • Technical support and application guidance

 

Gardner Denver was the first manufacturer in its class to offer a 12-month / 18-month warranty, reinforcing its commitment to quality and long-term fleet reliability.

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