Great Plains NTA2007HD Operator Manual - Manual (Page 102)

98 Great Plains Manufacturing, Inc. Contents Index NTA607/2007HD
166-283M Contents Index 04/04/2011
Planting too little
(all rows) Incorrect seed rate, meter flutes, rate range
or gearbox setting. Check seed rate information beginning on
page 65.
Excessive field speed. Excessive field
speed: chart rates were developed at
10.5 kph (6.5 mph) Reduce field speed.
Air system leaks retarding material flow
above meters Check hopper lids, meter seals, manifold
caps and seed hose connections. Adjust
latch and/or replace seals as needed.
Seed size and weight or fertilizer density and
granularity vary from chart Calibrate. Adjust rate to compensate.
Seed or fertilizer density and granularity may
vary from season to season, batch to batch
and between different suppliers. Re-calibrate if materials might have changed
since last calibration.
Low material level in hopper Re-fill hopper.
Oversized contact drive tire, or low air pres-
sure in contact or front transport tires, can
decrease rates. Correct tire size and air pressure, page 147.
Contact tire slipping. If due to moisture, con-
ditions may be too wet to plant. Check tire sizes, condition and inflation.
Replace incorrect tires and worn tires. Inflate
low tires.
Fan speed too low Increase fan speed (page 82).
Fan won’t run fast enough Tractor must be able to supply 18 gallons/
minute at 200 psi.
Fan won’t run fast enough Check that hydraulic fan check valve is not
installed backward.
Actual field size is different. Verify field size.
Excessive bout/pass gaps.
Irregular shaped field. Adjust marker, page 95.
Build-up of treatment or debris in seed
meter. Clean out seed meter, page 109.
Plugged opener seed tube. Lift drill, expose bottom of seed tube and
clean out.
Thrown or worn drive chains skipping. Check drive chains, sprockets and idlers.
Meter sprocket damaged Replace worn or damaged “stars” on meter
shaft
Planting too much
(all rows) Incorrect seed rate, meter flutes, rate range
or gearbox setting. Check seed rate information beginning on
page 65.
Seed size and weight or fertilizer density and
granularity vary from chart Calibrate. Adjust rate to compensate.
Seed or fertilizer density and granularity may
vary from season to season, batch to batch
and between different suppliers. Re-calibrate if materials might have changed
since last calibration (page 75).
Actual field size is different. Verify field size.
Excessive bout/pass overlap.
Irregular shaped field. Adjust marker, page 95.
Undersized contact drive tire, or excess air
pressure, can increase rates. Use correct tire size and air pressure,
page 147.
Problem Causes Solutions