General application troubleshooting – Great Plains NP4000 40-foot Operator Manual User Manual
Page 79

Great Plains Manufacturing, Inc.
Troubleshooting
75
2012-03-28
407-776M
General Application Troubleshooting
Problem
Cause
Solution
Excess
Material
Remaining
Field size different.
After ruling out metering problems, re-check geography.
Excessive gaps between applicator
passes.
Gap between opposing pass end trenches should be one
row space (e.g. 30in)
Material
Consumption
Too High
Field size different.
After ruling out metering problems, re-check geography.
Excessive overlap
Gap between opposing pass end trenches should be one
row space (e.g. 30in). Also check tracks for unintended
re-applications, particularly if relying on GPS mapping.
Tank or system Leak
Suspend application. Check for leaks.
Rows Not
Fertilized
Check for plugged row-unit tube
Stop application. Lift implement and inspect applicators.
No Fertilizer
Flow
Strainer plugged
Close all valves. Inspect strainer (page 80). Clean screen
as needed.
Material run-out
Check tank level.
Applicators
plugging
frequently
Applicator tips too low for coulter
depth
Raise applicator weldment (page 54).
Coulter blades too worn
Replace coulter blades.
Field too wet
Wait for drier conditions.
Applicator not level from front to rear Check implement front-to-back level (page 26).
Tractor rocking backward during
stops, or lift sequence pushing
applicators backward
Refine stopping and/or lifting technique to avoid reverse
coulter motion in ground.
Low Manifold
Pressure
Rate, speed or material viscosity too
low for orifice plate size
Re-check pump rate determination, Range sprocket, pump
dial and console setup (Option). If correct, replace orifice
plates with a smaller size (page 69).
Strainer clogged
Clean strainer, and possibly use coarser screen size
(page 71).
Ground Drive: Relief valve set too
low
Adjust relief valve (page 71).
Boom leak
Repair boom.
Tank vent closed or plugged; pump
cavitating
Check tank lid. check pump prime.
Material run-out
Refill.
High Manifold
Pressure
Orifice plate size too small
Replace orifice plates (page 69).
Applicator nozzle orifice smaller than
orifice plate.
Remove nozzle.
Orifice plates plugged
Clean plates. Check sizing.