GREAT PLAINS PL5500, Operator'S Manual, Page: 82 / 109

PL5500 Planter Table of Contents Index Troubleshooting
Great Plains | 411-633M | 10/21/2021 75
Seed Pool Recovery
When a seed meter has been starved of seed, the
back-flow of air through the open seed inlet gate
reduces delivery air flow. This causes seed delivery
to be slow. If you start or resume planting with an
empty seed pool, the delivery flow may be too low to
keep the meter supplied. The steps below quickly
prime the meter by rebuilding the seed pool.
1. Close the gate (1). This stops the air back-flow.
2. Clear the bridge (2) or blockage that caused the
meter to run empty.
3. With the fan running, listen for seed to fall into the
inlet (3).
4. Wait for seed fall (4) to taper off and stop.
5. Open the gate to the operating setting.
6. Start or resume planting.

Pressure Gauge Troubleshooting
If the Magnehelic
®
pressure gauge does not read
zero with the fan off, inspect the gauge, and re - zero
as needed.
Port ID for troubleshooting:
Over - pressure relief port (1), with plug in place
Low - pressure port (2) - breather/atmospheric pressure
High - pressure port (3) - from manifold chamber
Alternate high/low ports are plugged.
Check for chamber and breather line problems
before
re - zero. Re - zero cannot accurately
compensate for leaks and blockages.
Re
- zero the Magnehelic
®
gauge on level ground with
the fan off, and if possible, under no - wind conditions.
Turn the set screw (4) on the meter face until it reads
zero from the tractor driver’s viewing position.
Inaccurate Reading Hazard
Gauge readings may be inaccurate or sluggish
below 20° F.
1
29744
2
3
4
Problem Cause Solution
Non - zero with
fan off
Zero drift Re - zero (see
instructions
below)
Gauge reading
lower than
sensor
Relief port plug
missing or
damaged Replace plug
Breather line
blocked or
kinked Clear breather
line
Leak in sensing
line Check line to
chamber
Gauge
damaged Check for loose
cover, damaged
O
- ring
4
2
1
3
29842
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