Landoll 5531 Grain Drill - Manual (Page 39)

OPERATION AND MAINTENANCE
4-11
Air System Pressure
1. The air system pressure on the Grain Drill can safely
operate in a range from 15 psi to 100 psi. A system
pressure gauge is located at the front of the hitch and
can be seen from the tractor to monitor system
pressure (See Figure 4-7.) It is normal for the
system air pressure to vary while working in the field.
As the openers raise and lower over ground
conditions, so will the system pressure vary.
2. Do not at any time operate the air system below 15
psi. The air springs must maintain a minimum air
pressure for proper inflation. Too low of pressure will
cause the air spring to rub internally and lead to
failure.
3. System pressure should not exceed 100 psi. This is
the maximum recommended working pressure the
air springs are rated for. This will provide maximum
down pressure for the row units. A system relief valve
is installed at the front of the hitch to protect the
system from excessive pressure. Do not remove or
adjust the relief valve or damage to the air system
may occur.
4. To adjust the air system pressure, use the on board
air compressor to increase system pressure (See
“Compressor Operation” on page 4-10.) To lower
system pressure, pull and hold the ring located at the
bottom of the relief valve on the front of the hitch.
5. Initial settings – When beginning planting operations,
use a system pressure of 20-50 psi for light or sandy
soils, 40-60 psi for medium or conventional tilled
soils, and 70-100 psi for heavy and no-till planting.
These are initial settings. Operator must verify seed
placement and adjust air system pressure as
required.
NOTE
Excessive air pressure can raise the drill out of the
ground, particularly with low seed levels in the seed box.
Figure 4-7: Air System Pressure
6. Maintenance – Relieve air system pressure before
attempting to adjust or service any air spring. Do not
pressurize the air system unless all row unit
components are in place. When charging the system,
verify that all air springs are filling properly. If the air
spring buckles or rolls off to the side, relieve system
pressure, and work or roll the air spring over the
lower piston by hand. Slowly begin charging the
system and verify proper filling.
7. Storage – When storing the drill, leave the air system
charged, and allow the system to slowly leak down.
AIR
COMPRESSOR
0-160 PSI
PRESSURE
GAUGE
RELIEF VALVE
RELIEF VALVE
RING
5531 air system pressure op