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31 cu. ft., 24-Outlet with Split Shaft & Two Clutches with Black Metering Wheels for Cover Crop and Granular Chemical (Not Recommended for Fertilizer) (Model # 6631GN24C)

31 cu. ft. Orbit-Air
Product ID: 6631GN24C

31 cu. ft., (approx. 24.8 bushels or 1,395 lbs. granular chemical capacity) 24-outlets, split shaft, two clutches with Raven hydraulic control for speed compensated rates. Comes with weather-tight cover and latches along with fill platform. Black (C) metering wheels for cover crops and granular chemical.  Each outlet includes a slide closure to regulate the amount of product coming in contact with the metering wheel and can be used to block off an outlet . Hydraulic blower driven by a 3-port, 8-GPM hydraulic blower motor producing 8-20 oz. of air pressure (10-ft. of hydraulic hose is supplied for input and outlet ports - user to supply hydraulic hose and couplers). Rate control is achieved through in-cab controller allowing operator to pre-set up to two rates or change them on-the-go. Maximum broadcast width at 30-inchdeflector spacing is 60-ft. Unit comes mounted to a square steel tubular mounting frame - operator may need to provide additional tubing, brackets, etc., to clear cylinders, leveling bars, etc., when attaching to parent implement. Note: For rates lower than 10 lbs. per acre, user should order half-rate metering wheel package for each outlet (09096921) to achieve optimum performance.

Select Your Options
Guide: 300-ft - 10-18 Outlets
For Users Already Owning a Model 440, 600 or 660 with Granular Revision
For user that own a Raven radar interface
Contact Gandy for the location of your nearest dealer.
U.S. MSRP (FOB Owatonna): $23,746.00
Image shown is for informational purposes only, and may not necessarily represent the configurable options. Gandy Company reserves the right to change product specifications, options or prices at any time.

66 Series Orbit-Air Features Hydraulic Speed Compensated Rates with Raven Controller. Ideal for Applying Granular Chemicals and Seed

Each unit is furnished with a specific set of metering wheels. Metering wheel designation is found in the last letter of the model number 

  • Black (C) metering wheel for granular chemicals and seeds at low rates such as alfalfa, canola, etc.
  • Red (F) metering wheel for fertilizer and small seeds at high rates such as rice, wheat, etc.
  • White (S) metering wheel for large seeds such as soybeans and field peas
  • Yellow (V) metering wheel for higher rates of fertilizer (applies 1.6 times more than red metering wheel)

Please note that black poly tubing is recommended for fertilizer applications and flexible tubing is recommended for granular chemical and seed


  • Raven in-cab monitor allows user to preset two rates and vary rates on the go - maintains distance, area and volume information
  • May deduct Raven console if user has a model 600, 660 or 440 equivalent that has been updated to granular readout
  • Variable speed hydraulic drive motor
  • Speed sensor magnet with 20-ft. cable
  • 22-ft. cabling from clutches and rate control processor
  • Internal sieve screen
  • Cover
  • Individual metering wheels for each opening
  • Slide closures for each opening
  • Cleanout chute
  • Sight window
  • 3-port, 8-gpm hydraulic blower motor (uses tractor's hydraulic system - 3rd port is for case drain back to reservoir)
  • Produces 8-20 oz. of air pressure (adjustable for type of material being metered)
  • 10-ft of hydraulic hose is supplied (user to supply hose couplers)
  • Mixing chambers require 1-inch I.D. hose unless noted
  • Operator's manual and rate charts supplied
  • Built-to-order

Extra Mounting Equipment: User may need to provide additional tubing to mount hopper on parent implement to clear cylinders, leveling bars, etc. Deflectors, if ordered, may need to have mounting angle cut or altered to mount on parent implement.



 *Weights are approximate (granular chemical capacity calculated at 45 lbs./cu. ft.)
**Outlets can be individually closed

Are Orbit-Air models designed for specific implements?

No. All Orbit-Air models are equipped with a rectangular, universal tubular steel frame mounting base.

Are there any special metering wheels for large seeds?

Yes. A white metering wheel is available for large seeds such as soybeans, field peas, etc.

Can fertilizer be used in the Orbit-Air?

Yes. Fertilizer can be used in an Orbit-Air that is equipped with red or yellow metering wheels. Application rates are determined by the density of the fertilizer in pounds per cubic foot. Models which have an “N” in the model number are not recommended for fertilizer.

Can Lock ‘N Load lids be added to the hopper?

Yes. Hopper lids can be die cut and Lock ‘N Load valves can be installed at the factory. Please note this is a special order.

Do all 66-series Orbit-Air models have a hydraulic blower?

Yes. The blower is driven by a 3-port, 8-gpm hydraulic motor that uses the tractor’s hydraulic system to produce 8-20 oz. of air pressure depending on the recommendation for the product being applied.

How are rates controlled?

The 66-series Orbit-Air is equipped with a hydraulic motor that is linked to a Raven control console that uses a ground speed sensor to automatically adjust rates on the go.

I don’t have room on the implement to mount the Orbit-Air. Are there any other options?

For smaller units – 21.9 and 30 cu. ft. hopper sizes there are pedestal mounts for the hitch. Part no. 62170 is for an 8" x 12" rectangular tube and part no. 62172 is for an 8" x 10" rectangular tube. For larger hoppers, 50 cu. ft. or more, Gandy offers tow carts.

I’m replacing the hi-temperature sleeve and couplers on the shaft between the hydraulic motor and blower. What are the proper steps?

1) Remove top shield 2) Remove hydraulic motor 3) Replace sleeves from the top 4) Reinstall hydraulic motor 5) Attach top shield

In test mode, my Raven will not function?

1) Make sure there is a speed value programmed in “self-test”. 2) Is the console in the correct calibration mode – there are three modes: US is what you want. Ignore TU and SI. 3) A value must be programmed in every key except volume and time. 4) All boom switches must be in the “on” position. 5) When in test mode, the remote “run-n-hold” switch and “master” switch must be in the OFF position to function. Lowering the implement to the working position will automatically start the Orbit-Air unit. Raising the implement to transport or non-working position will stop the unit.

Is a case drain required?

Yes. The third port of the hydraulic motor is a case drain that must be returned to the tractor’s oil reservoir.

Is it possible to block off unused air chamber outlets if they are not needed?

Each Orbit-Air comes with a specified number of blank plates to seal off air chamber outlets. If you require additional blank plates to block off outlets you can order them through your local Gandy dealer. Keep in mind there are two types of blank plates: for narrow openings (“N” found in middle of model number) order p/n 62851-48. For standard air chambers order p/n 550829-4.

Is it possible to block off unused metering outlets if they are not needed?

Yes. Just simply slide the gate closed behind the metering wheel. 1) Make sure the tractor’s speed is holding steady. 2) Check the Raven console to make sure the correct meter calibration number is programmed.

My speed will not hold steady?

1) If using a ground wheel sensor make sure it is connected properly. 2) Check radar cable as the sensor may be too far away from the magnets.

What are some examples of granular herbicides used in the Orbit-Air?

Amiben 10 G, Avadex BW, Buckle, Dual II G, Dual 25G, Edge 5G, Eradicane 25G, Eptam 20G, Far-Go, Fortress, Heritage, Lasso II Rival 10G, Ro-Neet 10G, Showdown, Sonalan 10G, Surpass 20G, Sutan + 10G, Sutazine+ 18-6G, Treflan QR5, Treflan TR-10, Vernam 10G and similar products.

What are some examples of granular insecticides used in the Orbit-Air?

Counter 15G, Dipel 10G, Dyfonate 20G, Force 1.5G, Full-Back, Furadan 15G, Lorsban 15G, M-Peril, Mocap 15G, Pounce, Thimet 15G & 20G and similar products.

What are some examples of seeds that can be used in the Orbit-Air?

Alfalfa, Canola, Cotton, Flax, Hybrid Pearl Millet, Milo, Oats, Sorghumum-Sudan, Soybeans, Sunwheat, Wheat, Yellow Mustard, Yellow Clover, White Rice, etc.

What if I want a larger capacity hopper, but, I’m limited to the amount of space on my implement?

Gandy offers hopper extensions that increase the height and capacity of the hopper, while maintaining the same base size. Hopper extensions are available for 21.9 and 30 cu. ft. hoppers. Roof extensions are available to increase capacity on an 80 cu. ft. hopper to 100 cu. ft. and 120 cu. ft. hopper to 150 cu. ft.

What is a black metering wheel used for?

Black metering wheels are specially designed for granular chemicals and small seeds such as alfalfa and canola.

What is the red metering wheel used for?

The red metering wheel is used to apply fertilizer and small grains such as oats, wheat, rice, barley, etc.

What is the yellow metering wheel used for?

The yellow metering wheel is specially designed for high-volume applications of fertilizer. Delivers approximately 1.5 times more fertilizer than red metering wheels.