Great Plains NP3000A Operator Manual - Manual (Page 106)

102 NP3000 and NP3000A Table of Contents Index Great Plains Manufacturing, Inc.
407-613M Table of Contents Index 2014-04-22
Ground Drive Pump Troubleshooting
The CDS-John Blue NGP Pump Parts and Instructional
manual (12-M-43) has additional troubleshooting
information.
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 91).
Strainer clogged Clean strainer, and possibly use coarser screen size
(page 93).
Ground Drive: Relief valve set too
low Adjust relief valve (page 94).
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 91).
Tine nozzle orifice smaller than
orifice plate. Remove nozzle.
Orifice plates plugged Clean plates. Check sizing.
Problem Cause Solution
Low Rate Ground drive on Low Range when
rate requires High Exchange Range sprockets (page 94).
Dial setting incorrect Re-check Range and Dial settings for rate.
Ground drive slipping Check condition of arm and chains. Check operating height
of applicator (may be too high). If soil is too wet, try
reconfiguring for a lower manifold pressure, or wait for dryer
conditions.
Pump damaged See CDS-John Blue NGP Pump Parts and Instructional
manual.
Problem Cause Solution