Great Plains NP4000 40-foot Operator Manual - Manual (Page 79)

Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 75
2012-03-28 Table of Contents Index 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.