When operating independent seed drills, hydraulic flow requirements are highest when turning on the headlands. The recommended flow listed in the chart below allows the seeding system to be raised and lowered within two headlands. It should be noted that the recommended fan requirements are for the maximum operational speed (RPM) of the fan.Minimum Hydraulic Flow Requirements:
If the recommended values cannot be achieved, minimAum flow will provide adequate performance in most instances. If the hydraulic flow is less than the recommended, the fans may slow down and the openers may lift slowly in the headlands. This may result in the requirement for three headlands. In typical operating conditions one or both fans are operating at less than maximum output levels, which will reduce hydraulic requirements.
|Oil Flow Rate Required:||Minimum||Recommended|
Single REGULAR Fan (5000 rpm max.)
9 gpm (34L/min)
13 gpm (49L/min)
Single HIGH SPEED Fan (6000 rpm max.)
15 gpm (56L/min)
20 gpm (76L/min)
Single HIGH CAPACITY Fan (6000 rpm max.)
22 gpm (83L/min)
26 gpm (99L/min)
Single HIGH PRESSURE Fan (6000 rpm max.)
25 GPM (90L/min)
30 gpm (112L/min)
Dual REGULAR Fans
18 gpm (68L/min)
26 gpm (98L/min)
Dual HIGH SPEED Fans
30 gpm (112L/min)
40 gpm (152L/min)
Dual HIGH CAPACITY Fans
44 gpm (166L/min)
52 gpm (198 L/min)
REGULAR & HIGH SPEED Fans
24 gpm (91L/min)
33 gpm (125L/min)
HIGH SPEED & HIGH PRESSURE Fans
40 gpm (152L/min)
50 GPM (180L/min)
HIGH SPEED & HIGH CAPACITY Fans
37 gpm (139L/min)
46 gpm (175L/min)
HIGH CAPACITY & HIGH PRESSURE Fans
47 gpm (179L/min)
56 gpm (213L/min)
Hydraulic Pressure Requirements:
With many tractors, maximum hydraulic flow drops off sharply prior to maximum operating pressure. By setting the tractor to a pressure setting of 3100 psi the hydraulic flow will be near the rated output at the maximum operating pressure.
Air Seeder Fan Selection - General Recommendations
6000 Series air seeders require both a minimum and recommended operating pressure of 2500 psi.
7000 Series air seeders require a minimum operating pressure of 2900 psi and a recommended operating pressure of 3100 psi.
To determine the maximum application rates of a given seeding system, it is critical to consider implement width, spacing, expected ground speeds and the tractor's hydraulic capacity. It is also important to consider the drill's hydraulic requirements when lifting the openers when turning in the headlands. Refer to the Bourgault minimum fan speed charts to help determine maximum application rates.
6000 Series Air Seeder - Minimum fan speed charts for 6000 Series air seeder can be found on Bourgault's on-line parts system by navigating to > Product Information > Air Seeder Tanks > 6000 Series AS > Operator's Manuals > 200 Series Fan Speed Charts (Eng/Rus) (0252-00-95). 7000 Series Air Seeder
- Refer to the 7000 Series minimum fan speed charts
to determine which fan is required to apply the rates desired at the given implement width/spacing and seeding speed. They can be found on Bourgault's on-line parts system
by navigating to > Product Information > Air Seeder Tanks > 7000 Series AS > Operator's Manuals > 7000 AS Minimum Fan Speed Charts (0252-90-10).
High Speed Fan Recommendations
The High Speed Fan is equipped with a 12cc hydraulic motor that is able to achieve up to 6000 RPM. To achieve maximum performance and reduce possible coupler failures, ¾” hydraulic couplers are required.
High Capacity Fan Recommendations
The High Capacity Fan is recommended if selecting an air drill equipped with an 8 or 10 port primary manifolds. The High Capacity fan rotor is 3-1/2” wide, which is 1” wider than the Regular / High Speed fan rotors, and is equipped with a 16cc hydraulic motor. To achieve maximum performance and reduce possible coupler failures, ¾” hydraulic couplers are required.
High Pressure Fan Recommendations
The High Pressure Fan is recommended for the 3420 Paralink Hoe Drills, 3320-86 PHD on 10" & 12" spacing, and the 3720-70 ICD on 10" spacing. The High Pressure fan is equipped with a redesigned rotor and equipped with a 19cc hydraulic motor. To achieve maximum performance, units equipped with the High Pressure fan will have 1" hydraulic lines across the drill and air seeder, and ¾” hydraulic couplers.