Great Plains CTA4000 Operator Manual - Manual (Page 14)

12
Section 1 Preparation and Setup
CTA4000 Air Drill Implement 160-269M 2/1/06
Great Plains Mfg., Inc.
Bleeding Hydraulics
To function properly, the hydraulics must be free of air. If
hydraulics have not been bled, they will operate with jerky,
uneven motions and could cause wings to drop rapidly
during folding or unfolding. If hydraulics were not bled dur-
ing initial implement setup or if you replace a hydraulic
component, complete the following procedures.
!
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, see
a doctor immediately. Any fluid injected into the skin must be
surgically removed within a few hours or gangrene will result.
Bleeding Opener Lift Hydraulics
1.
Check hydraulic fluid level in tractor reservoir and fill to
proper level. You will need about 2 gallons of oil to fill
opener-lift cylinders.
2. With implement unfolded, disconnect rod ends of fold
cylinders and support cylinders so rods will not con-
tact anything when extended. See Figure 1-7.
3. Jack up and support implement frame high enough so
opener cylinders can be fully extended.
4. Fully extend opener-lift cylin-
ders.
5. Turn knobs on pressure-control valves com-
pletely counterclockwise, then turn them back
far enough to build up at least 1000 psi pressure
(about three clockwise turns).
6. Crack hose fittings at locations shown in Figure 1-8.
7. Slowly engage hydraulic lever in direction that lowers
openers until oil begins to appear at loosened fittings.
Continue engaging lever until all air has been
expelled, then tighten that fitting. Continue to supply
oil until one fitting is tightened at each location.
8. Slowly engage hydraulic lever in direction that raises
openers until oil begins to appear at loosened fittings.
Continue engaging lever until all air is expelled, then
tighten that fitting. Continue to supply oil until all fit-
tings are tight and openers are completely raised.
9. Cycle openers up and down about 10 times. Each time
you lower openers, hold tractor remote lever until
opener-lift circuit builds up to pressure set.
10. Lower implement frame to ground.
11. Raise and lock up openers by turning field/transport
selector valve to transport. See Figure 2-2, page 14.
Figure 1-7
Support Fold Cylinders
16432
17154
Figure 1-8
Bleeding Lift Cylinders