Great Plains 1625AHL Operator Manual - Manual (Page 101)

Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 97
2014-04-21 Table of Contents Index 411-020M
Low Pressure, at
Desired Rate Orifice size too large Choose alternate orifice plate size based on charts in Seed Rate
Manual (411-020B).
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 Close all valves. Inspect strainer (See Seed Rate Manual
(411-020B)). Clean screen as needed. Switch to a larger screen
size if materials clog strainer rapidly (and large size orifices are in
use).
Dumping at
Normal Pressure Relief valve setting too low Review relief valve setting per Seed Rate Manual (411-020B).
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 Rate Manual
(411-020B).
Various possible pump issues Refer to Trouble Chart in CDS-John Blue
®
LM-1250/LM-1255
Parts and Instruction manual, part number 12-M-43.
Pump Leaks
Various possible pump issues Refer to Trouble Chart in CDS-John Blue
®
LM-1250/LM-1255
Parts and Instruction manual, part number 12-M-43.
Pump Oil
Consumption Pump seals or O-ring Refer to Trouble Chart in CDS-John Blue
®
LM-1250/LM-1255
Parts and Instruction manual, part number 12-M-43.
Noisy Pump Crankcases components worn Refer to Trouble Chart in CDS-John Blue
®
LM-1250/LM-1255
Parts and Instruction manual, part number 12-M-43.
Liquid Fertilizer Troubleshooting
Problem Cause Solution