SECTION 6 - AIR SYSTEM SERVICE
page 6-10
CAUTION!
TO DETERMINE ADEQUATE CARRYING VELOCITIES
OPEN HOSE METHOD
NOTE: The Velocity Chart Method is another way of determining velocity, if the air cart is equipped with velocity
sensors. Refer to the air cart service manual for more information.
NOTE: The appropriate method to be used depends on the configuration of the air cart.
NOTE: Using excessive velocity will damage seed, increase wear on the system, blast seed out of the seed bed and
require increased fan speed. Inadequate air velocity will result in plugged lines. To check if the fan speed and
air damper settings are suitable for seeding, check product placement behind several openers and observe the
seed planting depth.
To avoid injury, stay well clear of air hose outlet
when performing this procedure. Seed or fertilizer
blowing out at a high speed can cause blindness
or other personal injuries. Wear personal
protection equipment, including eye protection, to
prevent injury caused by flying products.
For Single Shoot Systems:
1. Remove one secondary hose from an outside opener
for the highest rate meter box.
2. Fasten the hose to the frame of the tillage:
- The hose should be no more than 31 cm (12")
below the bottom of the frame member.
- Ensure the end of the hose is flush with the top of
the frame member, the outlet points face straight
up, and the hose is not kinked.
3. Begin seeding at normal operating speed.
4. From a safe distance, observe the product coming out
of the hose end:
- The product should discharge about 31 - 61 cm
(12 - 24") inches above the hose.
- STOP the meters if the product is not 31 - 61 cm
(12 - 24") out of the tube.
- Adjust either the fan speed or air damper setting to
reach a product discharge of 31 - 61 cm (12 - 24").
For Double and Triple Shoot Systems:
1. Remove both of the secondary hoses from the same
outside opener.
2. Fasten the hoses to the frame of the tillage:
- The hoses should be no more than 31 cm (12")
below the bottom of the frame member.
- Ensure the ends of the hoses are flush with the top
of the frame member, the outlets face straight up,
and the hoses are not kinked.
3. Begin seeding at normal operating speed.
4. From a safe distance, observe the product coming out
of the hose ends:
- Product should discharge the same height from
each hose. Adjust the air dampers so that the
products are at the same level.
- The product should discharge about 31 - 61 cm (12
- 24") inches above the hose.
- STOP the meters if the product is not 31 - 61 cm
(12 - 24") out of the tube.
- Adjust the fan speed to reach a product discharge
height of 31 - 61 cm (12 - 24").
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