Great Plains 2N-3020 Operator Manual - Manual (Page 13)

11
Section 1 Drill Preparation and Setup
2/28/08 2N-2420 and 2N-3020 Two-Section Folding No-Till Drill 196-164M-A
Great Plains Mfg., Inc.
4. Hitch the drill to the tractor using a hitch pin at least
one inch in diameter. Install a retaining clip on the
hitch pin to prevent it from working up.
NOTE: A clevis-style hitch, Great Plains part number 196-
136H, is available through your Great Plains dealer.
Installing Drill Control Console
1. Mount the control box at a convenient location in the
tractor cab. Connect the 12-foot extension cable to the
pin connector on the back of the control box. Route
the cable to the tractor drawbar area. Secure the cable
to avoid damage.
2. Connect the power cord to a 12-volt power source on
the tractor. The polarity of the power supply is very im-
portant. The red wire must be connected to the posi-
tive (+) battery terminal. The white wire must be
connected to the negative (-) battery terminal.
Bleeding Hydraulic Systems
A hydraulic system with air in the circuit will move in jerky,
uneven motions. If your hydrualics were not properly bled
or you replace a hydraulic component, bleed the hydrau-
lics.
Field-Lift Hydraulics
The field-lift system is equipped with four rephasing-type
hydraulic cylinders that require a special procedure for
bleeding air. Read and follow the procedure carefully. Air
in the system will cause uneven seeding across the drill.
Do not loosen hose fittings in order to bleed air from this
system.
!
WARNING!
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin causing serious injury. Avoid the hazard by
relieving pressure before disconnecting hydraulic lines. Use a
piece of paper or cardboard, NOT BODY PARTS, to check for
leaks. Wear protective gloves and safety glasses or goggles
when working with hydraulic systems. If an accident occurs, im-
mediate medical attention from a physician familiar with this
type of injury.
!
CAUTION!
This drill has a negative tongue weight when unfolded and
raised. Be certain that the drill is hitched securely to your trac-
tor drawbar and the hitch safety chain is securely attached to
the drill.
IMPORTANT: When hitching the drill to a different trac-
tor, check for differences in drawbar heights and re-ad-
just the drill hitch accordingly.
!
WARNING!
Never allow anyone under the drill when fittings are opened.
Escaping fluid may allow the drill to drop suddenly.
1. Check that the tractor reservoir is filled to the proper
level. It will take 4 gallons to charge the field-lift cylin-
ders.
2. Put the tractor in park and set the parking brake. If
your tractor does not have these features, block
wheels to prevent tractor from rolling.
3. Raise and support the main frame and outside ends of
boxes just high enough to take the weight off all four
field-lift cylinders.
4. With the drill blocked and supported, unpin both ends
of all four field-lift cylinders. The field-lift cylinders are
located on the wing gauge wheels and the main-frame
transport wheels. Remove and safely position the cyl-
inders so the rod ends are higher than the base ends.
Check that there is enough room for the cylinder rods
to fully extend without contacting anything.
5. With the tractor at idle, engage the lift-hydraulics lever.
When the cylinders for both gauge wheels have com-
pletely extended, hold the lever on for one minute.
6. Retract the cylinder rods. Extend the rods again and
hold the lever on for one more minute. Repeat this
step two more times to completely bleed the system.
7. Retract and reattach the hydraulic cylinders.
8. Recheck the tractor hydraulic reservoir level and add
clean fluid as necessary.
Transport-Lock Hydraulics
The transport-lock cylinders are not rephasing. The two
transport-lock cylinders are on each side of the main
frame above the transport axle pivot tubes. Follow these
steps to properly bleed the transport-lock hydraulics.
1. Check that the tractor reservoir is filled to the proper
level. It will take 0.07 gallons to charge the transport-
lock cylinders.
2. Raise the drill to field position and support the main
frame.
3. Select the locks system on the control console. Re-
tract the lock cylinders completely.
4. Loosen the connection between the hose and base-
end tee fitting on the left lock cylinder. With the tractor
at idle slowly work the remote lever to feed oil to the
base end of the lock cylinders. Stop when you see oil
coming from around the fitting. Do not attempt to fully
extend the lock cylinders when bleeding the base
ends.
IMPORTANT: To prevent trapped air pockets, the rod
end must be higher than any other part of the cylinder.