Great Plains YP825A Operator Manual User Manual
Page 98
94
YP425A, YP625A and YP825A
Great Plains Manufacturing, Inc.
401-651M
2014-08-15
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 (401-651B).
Various possible pump issues
Pump Leaks
Various possible pump issues
Pump Oil
Consumption
Pump seals or O-ring
Noisy Pump
Crankcases components worn
Dry Fertilizer Troubleshooting
Problem
Cause
Solution
No Fertilizer
Flow, All
Rows
Hopper empty
Check / refill hopper.
Chain missing at one or more
drive stages
Check all five chains from ground drive to hoppers. See “Dry
Fertilizer Chains” on page 153.
No Fertilizer
Flow, Some
Rows
Hopper plugged
Clean out any material clogging discharge port. See “Dry
Fertilizer Clean-Out” on page 100.
Shaft disconnected
Check couplers along final drive shaft.
No Fertilizer
Flow, One
Row
Applicator tube plugged with soil
Disconnect hose at top of applicator tube. Remove blockage
from below. Raise release height (page 60).
Applicator tube plugged with
fertilizer.
Disconnect hose at top of applicator tube. Remove blockage
from below. Use finer grained fertilizer, or dry out the fertilizer
if coagulation is the problem.
Liquid Fertilizer Troubleshooting
Problem
Cause
Solution