Great Plains 2N-3020 Operator Manual - Manual (Page 14)

12
Section 1 Drill Preparation and Setup
2N-2420 and 2N-3020 Two-Section Folding No-Till Drill 196-164M-A 2/28/08
Great Plains Mfg., Inc.
5. With the cylinders completely extended, repeat step 4
for the rod-end fitting.
6. Recheck the tractor reservoir and add clean fluid as
necessary.
7. Retract and extend the lock cylinders several times to
expel most air from the system. The remaining air will
be expelled gradually during day-to-day operations.
8. Recheck the tractor hydraulic reservoir and add clean
fluid as necessary.
Raise-To-Fold Hydraulics
The raise-to-fold cylinders are double acting but not
rephasing. There are four cylinders in the raise-to-fold sys-
tem. Two are on the tool bar, and two are on the tongue.
Follow these steps to properly bleed the raise-to-fold hy-
draulics.
1. Check that the tractor reservoir is filled to the proper
level. It will take 3.4 gallons to charge the raise-to-fold
cylinders.
2. Select the raise-to-fold system on the control console.
3. Check that the drill is unfolded and resting safely on
the ground.
4. Disconnect the rod-end clevis of both tool-bar cylin-
ders and both tongue cylinders. Support the cylinders
so the rods may extend and retract freely.
5. Retract the tongue cylinders completely. This will also
fully extend the tool-bar cylinders.
6. Loosen the hose-end fitting coming into the tee on the
base end of the left tongue cylinder.
7. Slowly work the remote lever to feed oil to the base
end of the tongue cylinders. Stop when you see oil
coming from around the fitting. Do not attempt to ex-
tend the tongue cylinders while bleeding the base
ends.
8. Loosen the hose-end fittings at the tee on the rod
ends of the tool-bar cylinders. Slowly work lever which
feeds oil to the rod end of the tool-bar cylinders. Stop
when you see oil coming from around the fittings. Do
not attempt to retract the tool-bar cylinders while
bleeding the rod ends.
9. Fully extend the tongue cylinders and retract the tool-
bar cylinders.
10. Loosen the hose-end fitting at the tee on the rod end
of the left tongue cylinder.
IMPORTANT: Do not attempt to bleed an O-ring fitting
or O-ring damage may occur.
IMPORTANT: Do not attempt to bleed an O-ring fitting
or O-ring damage may occur.
11. Slowly work the lever in the opposite direction to feed oil to
rod end of the tongue cylinders. Stop when you see oil
coming from around the fitting. Do not attempt to retract
the tongue cylinders while bleeding the rod ends.
12. Loosen the hose-end fittings at the tee coming from the
base ends of the tool-bar cylinders. Slowly work the lever
to feed oil to the base end of the tool-bar cylinders. Stop
when you see oil coming from around the fittings. Do not
attempt to extend the tool-bar cylinders while bleeding the
base ends.
13. Extend and retract the cylinders several times to expel
most air from the system. The remaining air will gradually
be pushed to the tractor during day-to-day operations.
14. Repin the tongue and tool-bar cylinders. Raise and lower
the wings several times to check for proper operation. If
movement is erratic, repeat bleeding operation.
15. Recheck the tractor hydraulic reservoir level and add
clean fluid as necessary.
Fold Hydraulics
The fold cylinders are not rephasing. The two fold cylinders
connect the main frame and drill boxes. Follow these steps to
properly bleed the fold hydraulics.
1. Make sure the tractor hydraulic fluid reservoir is filled to
the proper level. It will take 1.75 gallons to charge the fold
cylinders.
2. With the boxes unfolded unpin the rod-end clevis and sup-
port the fold cylinders so they can be extended and retract-
ed.
3. Select the fold system on the control console. Retract the
fold cylinders completely.
4. Loosen the connection between the hose-end and base-
end tee fitting on the left fold cylinder.
5. With the tractor at idle slowly work the tractor lever to feed
oil to the base end of the fold cylinders. Stop when you see
oil coming from around the fitting. Do not attempt to extend
the fold cylinders when bleeding base ends.
6. With cylinders completely extended, repeat the procedure
for the hose connection at the rod end.
7. Retract and extend the cylinders several times to expel
most air from this system. The remaining air will gradually
be pushed to the tractor during day-to-day operations.
8. Recheck the tractor reservoir level and add clean fluid as
necessary.
IMPORTANT: Check that the transport-lock and raise-
to-fold systems are bled and completely operational
before working with the fold hydraulics.