Great Plains YP3025A Operator Manual - Manual (Page 48)

44 YP3025A Table of Contents Index Great Plains Manufacturing, Inc.
401-705M Table of Contents Index 02/16/2012
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 3500 rpm or at speeds under
2000 rpm.
At excessive rpm, too much air flow can cause:
• seed to plug the air box
• seed suspension in a bulk seed box
• 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.
Note: The Seed Rate manual provides initial values for
meter pressurization. Normal readings are in the
0.8in to 4.0in water pressure range, and vary con-
siderably with crop.
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 run-
ning 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 2000 and 3800 rpm, see “Seed Delivery Trou-
bleshooting” on page 90.
When starting empty you must blow seed out to the
meters for two to four minutes to fill meters.
Note: During “FILL METER”, all air is routed to the air
box, and none to the meter pressurization system.
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.
Recommended Fan Speeds
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 simul-
taneous 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.
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.
YP3025A Bulk Box
Initial Fan Speed 2700 rpm 2500 rpm
11.6 gpm 11.2 gpm
44 liters/min 42 liters/min
4.5 gpm 4.5 gpm
17 liters/min 17 liters/min
16.1 gpm 15.7 gpm
61 liters/min 59 liters/min
Fan Speed Range 2300 - 3500 rpm 2300 - 3200 rpm
9.9 - 12.9 gpm 9.9 - 12.4 gpm
37 - 49 lpm 37 - 47 lpm
4.5 gpm 4.5 gpm
17 liters/min 17 liters/min
16.1 - 15.7 gpm 14.4 - 16.9 gpm
61 - 59 lpm 54 - 64 lpm
² Does not include oil for lift/lower or markers.
Seed Hopper¹
Fan Oil
Consumption²
Hydraulic Drive Oil
Consumption²
Total² Oil, Motors,
Initial Speed
Fan Oil
Consumption²
Hydraulic Drive Oil
Consumption²
Total² Oil, Motors,
Speed Range
¹ 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.