GREAT PLAINS PL5700, Operator'S Manual

Page: 40 / 150

Great Plains | 411-681M | 04/08/2021 33
PL5700 Planter Table of Contents Index Operation
Several rows have a pressure sensor port (14) for
the meter pressure system. A line from each of these
rows is connected to a pressure sensor chamber
(15) to average the pressures.
The averaged pressure is reported by a pressure
gauge (16). See “ Fan Adjustment ” on page 34 for
using the gauge to make fan adjustments.
Do not operate in the ground with the fan
shut off, or with insufficient air pressure. The
meters will completely fill with seed. Meter
clean - out may be required to resume
normal operation.

Fan Hydraulics - Row Hoppers
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.
Tractor Connections
Fan hydraulic hose connectors to the tractor:

3/4 FORB quick disconnect flatface (1) - case
drain connector

1-1/16 FORB male quick disconnect (2) - motor
return

3/4 FORB male quick disconnect poppet type (3)
- pressure supply
Always connect the case drain hose first.
The case drain (1) hose protects the outer seal of the
hydraulic motor. It is a small line to the hitch, supplied
with a specialized low-seep, flat-face case drain
quick disconnect.
Fan Hydraulic Hoses
Hydraulic hoses to the fan must be properly
connected for the fan to operate in the correct
direction, at recommended speeds, and without
damage.
Hydraulic hose connections to the fan:

9/16 SAE case drain port (A)

1-1/16 SAE return port (B)

1-1/16 SAE pressure port (C)
Correct air flow (D) is toward the outlet.
Connect the motor return hose (2) to the sump.
A pressure
- relief quick-disconnect coupler for the
return line prevents motor damage if the return line is
not connected, or is connected incorrectly. However,
an oil spill results if the return line is not correctly
connected.
Connect the fan pressure hose (3) to a tractor
remote. If a priority remote is available, use it for the
fan.

Fan Operation
Rotating Fan Blade Hazard
The fan accelerates instantly. Body parts and
clothing can be drawn into the fan, resulting in
serious injury or death. Do not operate the fan
with the guard screen removed. Disconnect
fan circuit when working on fan.
Low Population Risk at Turns
Aggressive lift and lower operations and
simultaneous marker operations can reduce fan
rpm below that needed to pressurize meter
disks. If seed falls out of cells, skips will occur
shortly after turns.
Use the tractor remote hydraulic valve flow control to
set fan speed. Always start the fan with a low flow
setting. Monitor fan rpm with the console.
Gradually bring the fan up to the recommended initial
fan speed - 2800 rpm.
The console and pressure gauge readings should
agree within a few tenths of an inch.
The Material Rate manual provides initial
values for meter pressurization. Normal
readings are in the 0.8 inch to 4.0 inch water
pressure range and vary with the crop.
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TP-71508
2
1
3
TP-75294
A
C
D
B
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