Great Plains YP1625A Operator Manual - Manual (Page 47)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 43
2013-08-13 Table of Contents Index 401-625M
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 3100 rpm (on model YP1225A),
over 3500 rpm (on model YP1625A) or
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
• 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.
Note: The Seed Rate manual provides initial values for
meter pressurization. Normal readings are in the
0.8 inches to 4.0 inches H
2
O range, and vary
considerably 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
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 2000 and 3500 rpm, “Seed Delivery
Troubleshooting” on page 84.
Note: During “FILL METER”, all air is routed to the air
box, and none to the meter pressurization system.
Steps for setting and adjusting the air system are found
at “Fan and Meter Pressurization Adjustment” on
page 51.
Recommended Initial Fan Speeds
YP1225A YP1625A
Bulk Seed Hopper* 2300 rpm 2700 rpm
PROBOX 2100 rpm 2500 rpm
At operating speeds, typical oil flows are in the range:
Ground Drive Planters:
8-10 gpm (30-38 lpm) for YP1225A
10-12 gpm (38-45 lpm) for YP1625A
Hydraulic Drive Planters:
12-14 gpm (45-53 lpm) for YP1225A
14-16 gpm (53-61 lpm) for YP1625A
* 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.
The figures above do not include oil for lift/lower or for
marker operation.
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.