Great Plains YP2425A Operator Manual - Manual (Page 48)

44 YP2425A Table of Contents Index Great Plains Manufacturing, Inc.
401-626M Table of Contents Index 2014-02-10
Fan General Operating Information
Use tractor remote hydraulic valve flow control to set fan
speed. Always start the fan with a low flow setting.
Monitor fan rpm with the seed monitor.
Gradually bring fan up to the recommended initial rpm.
The split-air servo vane engages only above 50 rpm.
Do not run the fan over 4300 rpm or under 2500 rpm.
At excessive rpm, too much air flow can cause:
• seed to plug the air box
• seed suspension in a bulk seed box
• unstable split air control
• oil heating
• slow lift times
If the rpm is too low, the split-air system may divert
nearly all the air to the meter pressurization, leaving
none for seed transport (or just enough to plug low spots
in seed hoses).
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.
If at suggested fan rpm, desired pressure cannot be
reached, chances are the fan is running backwards. If
the rpm and meter pressurization readings are correct,
but the meters are starved of seed, the fan may be
running backwards and the meter pressurization system
is taking all the air, leaving little or none for seed delivery.
Reverse the inlet/return lines at the hitch.
If air system does not operate suitably with fan speeds
between 2500 and 4300 rpm, see “Seed Delivery
Troubleshooting” on page 93.
When starting empty you must blow seed out to the
meters for two to four minutes to fill meters.
The monitor has a level sensor below the hopper or seed
box to warn when seed box is empty. There are three to
four acres of seed in the system when the sensor first
indicates box empty, depending on seeding rate.
To set and adjust the air system, see “Fan and Meter
Pressurization Adjustment” on page 59
Y-Tubes
Refer to Figure 51
Y-tube gates can be shut off to feed only one row for
single-row planting on a twin-row machine. In the
photograph, the left meter tube is open and the right
closed.
You can also shut off the Y-tube gates to clean out the air
system and meters. See “Air System Clean-Out” on
page 98.
Recommended Fan Speeds
YP2425A Seed Hopper* Bulk Box
Initial Fan Speed 3300 rpm 3000 rpm
Oil Consumption 21.2 gpm 19.2 gpm
80 liters/min 73 liters/min
Fan Speed Range 2700 - 4300 rpm 2700 - 3600 rpm
Oil Consumption 17.2 - 27.8 gpm 17.2 - 23.2 gpm
65 - 105 lpm 65 - 88 lpm
* This assumes a 2007+ Great Plains hopper, or older hopper
with the vent line update. For an older unvented hopper, use the
rpms recommended for ProBox.
Low Population Risk at Turns:
The figures above do not include oil for lift/lower or oil for
marker operation. Aggressive lift/lower operations, and
simultaneous lift/marker operations, can reduce fan rpm below
that needed to pressurize meter disks. If seed falls out of
pockets, low population bands will occur shortly after turns.
Unless the tractor has generous oil flow capacity, raise/fold
markers before lift, and lift slowly. Watch manifold pressure
and tune operations to keep it at planting levels in turns.
The Seed Rate manual provides initial values for meter
pressurization. Normal readings are in the 0.8 inch to
4.0 inch H
2
O range, and vary considerably with crop.
During “FILL METER”, all air is routed to the air box,
and none to the meter pressurization system.
Before the first planting each season, or when using
new meters or meter wheels for the first time, or at the
start of each season, before filling with seed, add
1 ⁄
3
cup (80 ml) Ezee Glide Plus to bottom of airbox.
Recommended Fan Speeds
Figure 51
Seed Y-Tube
29758