
Great Plains | 411-633M | 10/21/2021
84
PL5500 Planter
Troubleshooting
PTO Troubleshooting
Low Fertilizer
Flow
Lack of airflow, other
If low flow problems persist after checking all other settings
and hardware, swap blank plates in fertilizer meters to mesh
screens found in the manual pack.
Problem
Cause
Solution
Problem
Cause
Solution
Seed meter
pressure too
low
Flow control adjusted too low
Increase flow control. “
Fan butterfly valve closed or set at
too high an angle
Reduce to 30.
PTO rpm too low
Bring up PTO rpm, but do not exceed 540 rpm.
Fan running in reverse (multiple
possible causes)
See “
Fan running in reverse
” below.
Pump cavitating
Check oil level “
No blank disks in unused seed meters Install blank disks to balance pressure.
Seed inlet shutters open too wide
Verify setting vs., rate charts. Adjust as need for actual seed pool.
Oil filter clogged
Replace oil filter and oil “
Magnehelic
®
gauge disconnected
or sample line(s) leaking
Check air gauge system.
Magnehelic
®
gauge uncalibrated
Re
-
zero. See “
Pressure Gauge Troubleshooting
Flow control valve failure or
malfunction
Repair or replace valve.
Fan seals damaged
Repair or replace fan motor.
Pressure
correct on
Magnehelic
®
,
but skips or
doubles
Pressure gauge disconnected or
sample line(s) leaking
Check air gauge system.
Magnehelic
®
gauge uncalibrated
Re
-
zero. See “
Pressure Gauge Troubleshooting
Seed variety may require adjustment Check all other possible pressure errors, then fine tune
pressure for one seed per disk cell.
Oil overheating
Oil filter clogged
Replace oil filter and oil “
PTO rpm too high
Adjust system for ideal pressure at lower PTO rpm.
Fan butterfly valve angle too high
Reduce to 30. See “
Butterfly Valve (Dry Fertilizer)
Fan running
PTO shaft turning
counter
-
clockwise
Set tractor controls for clockwise PTO.
Hoses reversed
Check hose routing from pump to valve, to tank fan in Parts
manual.