NP2540
Troubleshooting
111
2019-04-12
417-459M
Ground Drive Pump Troubleshooting
The CDS-John Blue NGP Pump Parts and Instructional
manual (12-M-43) has additional troubleshooting
information.
Problem
Cause
Solution
Low Rate
Ground drive on Low Range when rate
requires High
Exchange Range sprockets (page 103).
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 drier conditions.
Pump damaged
See CDS-John Blue NGP Pump Parts and Instructional manual.
High Rate
Ground drive on High Range when rate
requires Low.
Exchange Range sprockets (page 103)
Dial setting incorrect
Re-check Range and Dial settings for rate.
Low Manifold
Pressure
Relief valve set too low
Adjust relief valve (page 103).
Ground drive on Low Range when rate
requires High
Exchange Range sprockets (page 103).
Field Speed too low
Increase speed or reduce orifice plate size.
Ground drive wheel or chains 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 drier conditions.
Product
Dumping at
Relief Valve
Rate, speed or material viscosity too
high for orifice plate size
Re-check pump rate determination, Range sprocket, pump dial
and console setup (Option). If correct, replace orifice plates with
a larger size (page 100).
Orifice plates clogged
Use larger plates (page 100) or finer strainer screen (page 102).
Relief valve set too low
Adjust relief valve (page 103).
Tines plugged
Clean out tine tubes.
Material slushy due to low temperature,
or actual ice on boom.
Wait for warmer conditions.
High Manifold
Pressure
Ground drive on High Range when rate
requires Low
Exchange Range sprockets (page 103).
Field speed too high
Reduce speed or increase orifice plate size.