GREAT PLAINS PL5200, Operator'S Manual, Page: 37 / 110

PL5200 Planter Table of Contents Index Operation
Great Plains | 411-825M | 12/07/2020 30
Separate pressurization tubes (5) provide air to the
meters that holds the seed in disk cells until released
to the seed tubes.
A sensor in each seed tube reports seed passage to
the seed monitoring system which reports counts
and rates on the console.
Dual-Fan Air System Hydraulics
Motor Seal Damage Risk
Do not apply pressure to the case drain line.
Do not change the special quick connector. A
restricted or sealed case drain line will
promptly result in motor seal damage.
Fan Motor Damage Risk
When disconnecting the hydraulic hoses,
always detach the case drain hose last to
prevent damage to the fan motor.
Hydraulic Motor Performance Risk
Do not attach the motor return/low pressure
case drain line to a power-beyond port.
Hydraulic hoses serve the fans and must be properly
connected for the fans to operate in the correct
direction, at recommended speeds, and without
damage.
(1) Always connect the case drain hose first.
The case drain hose protects the outer seal of
the hydraulic motor. It is small line to the hitch,
supplied with a specialize low-seep flat-face case
drain quick disconnect. Pressure spikes during
motor operation and pressure cycles due to
temperature change are bled off by the case
drain.
(2) Pressure line from tractor retract.
(3) Return to tractor along right tool-bar.
(4) Pressure line from tractor retract fold/bulk
value.
(5) Return from delivery fan to meter pressure
fan.
(6) Case drain from meter pressure fan to
delivery fan motor.
(7) Return bypass to motor tank port.
The fan hydraulic circuits include a check valve which
provides a relief path for oil at motor shutoff. The
resulting low fan rpm provides indication of reverse
connection.
If a reversed fan is suspected, observe during shutoff
since the direction of motor is easier to see at lower
rpm rates.
Initial startup is nearly instantaneous,
making observing at startup difficult.
If a fan is connected in reverse, it may not run at all
due to no oil source at the return connection. If oil is
present, oil bypass at the check valve prevents the
fan from reaching operating rpm. A reversed fan is
incapable of providing sufficient air flow for planting.
Fan Operation
Use the tractor remote hydraulic valve flow control to
set fan speed. Always start the fans with a low flow
setting. Monitor fan rpm with the seed monitor.
Gradually bring fans up t o the recommended initial
rpm. The recommended initial fan speed is 2800
rpm.
The monitor console can report meter pressurization.
There is also a Magnehelic air pressure gauge.
These two readings should not disagree by more
than a few tenths of an inch.
The Seed Rate manual provides initial
values for meter pressurization. Normal
readings are in the 4/5 to 4 inches (2 to 10
cm) H
2
O and vary considerably with crop.
If the fans are running at suggested rpm or the
meters are not getting seed, the fans may be running
backward. Reverse the inlet/return lines at the hitch.
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