Great Plains YP825AR Operator Manual User Manual
Page 97
Great Plains Manufacturing, Inc.
Troubleshooting
93
2014-06-17
401-923M
Low Pressure, at
Desired Rate
Orifice size too large
Choose alternate orifice plate size based on charts in Seed
and Fertilizer Rate manual (401-923B).
Orifices correct plate call size, but
their holes are enlarged from
extended use
Obtain new plates in the desired size. Discard worn plates.
Rate may actually be low
Check fertilizer transmission Driving/Driven sprockets.
Uneven Flow, at
Desired Rate
One or more orifice plates plugged Clean and re-installed orifice plates. Check that materials are
not too viscous or granular for the orifice size.
Plate sizes vary between rows
Check that all nozzles have the same size plates (with the
possible exception of outside rows serving zone coulters).
Pressure
Unstable
Strainer clogged
Dumping at
Normal Pressure
Relief valve setting too low
Review relief valve setting per Seed and Fertilizer Rate
manual (401-923B).
High Pressure, at
Desired Rate
Orifice size too small
Review orifice sizing. If at recommended size, try the next
large size. Charts are based on typical density/viscosity
materials.
Plugged nozzles
Inspect low-flow rows, or several nozzles. Clean plates.
Consider smaller strainer screen size and/or large orifice
plate size. Sedimentation, coagulation, particulates, foreign
matter can also cause unusually high pressure.
Orifice plates inverted
Orient plates with legends facing outlet. Orifice port holes are
not symmetrical, and at smaller sizes this can cause slightly
higher back-pressure with denser materials.
Very High
Flow
Fertilizer transmission in High
Range when Low Range was
intended.
Swap sprockets at transmission. See Seed and Fertilizer
Rate manual (401-923B).
Various possible pump issues
Pump Leaks
Various possible pump issues
Pump Oil
Consumption
Pump seals or O-ring
Noisy Pump
Crankcases components worn
Liquid Fertilizer Troubleshooting
Problem
Cause
Solution