Great Plains YP825A Operator Manual - Manual (Page 97)

Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 93
2014-08-15 Table of Contents Index 401-651M
Liquid Fertilizer Troubleshooting
Problem Cause Solution
No Fertilizer
Flow Various possible pump issues Refer to Trouble Chart in CDS-JohnBlue LM-1250/LM-1255
Parts and Instruction manual, part number 12-M-15.
Discharge and/or main selector
valve closed Check that discharge valves are open to selector valve, and
selector valve is open to pump. See “Liquid Fertilizer
Operation (Option)” on page 35
Chain missing at one or more
drive stages Check all five chains from ground drive to pump. See “Chain
Routing” on page 147.
Tank plugged Dilute or clean out any material clogging discharge port. See
“Liquid Fertilizer Clean-Out” on page 99.
Strainer plugged Close all valves. Inspect strainer (See Seed and Fertilizer
Rate manual (401-651B)). Clean screen as needed. Switch
to a larger screen size if materials clog strainer rapidly (and
large size orifices are in use).
Pump setting at or near zero Recommended pump adjuster settings are in the range
2 to 10. See Seed and Fertilizer Rate manual (401-651B).
Material run-out Check tank level.
Material merely low - loss of prime Add material. When tank level is below pump inlet level, any
air allowed in the line can cause the pump to lose prime.
Air in pump due to slope (two-tank
system) Add material, meter from one tank at a time, or close empty
tank. When planting across a slope, material can flow from
one tank to the other. If an empty tank is open to the pump,
the pump will cavitate and not meter fertilizer.
Low Rate Fertilizer transmission in Low
Range when High Range was
intended. Swap sprockets at transmission. See Seed and Fertilizer
Rate manual (401-651B).
Various possible pump issues Refer to Trouble Chart in CDS-JohnBlue LM-1250/LM-1255
Parts and Instruction manual, part number 12-M-15.
Low Pressure, at
Desired Rate Orifice size too large Choose alternate orifice plate size based on charts in Seed
and Fertilizer Rate manual (401-651B).
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 and Fertilizer
Rate manual (401-651B)). 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 and Fertilizer Rate
manual (401-651B).