Great Plains CPH-20 Operator Manual - Manual (Page 11)

9
Section 1 Preparation and Setup
12/29/2011 CPH Center Pivot Hitch 148-152M
Great Plains Mfg., Inc.
To distinguish hoses on the same hydraulic circuit, refer to
plastic hose holder. See Figure 1-7. Hose under extend-
cylinder symbol feeds cylinder base ends. Hose under re-
tracted-cylinder symbol feeds cylinder rod ends.
Figure 1-7
Hydraulic Hose Color Ties
Connect hydraulic hoses from tongue cylinder to one set
of tractor outlets. Connect hoses from transport-lift cylin-
ders to another set of tractor outlets.
Bleeding the Hydraulics
!
WARNING!
Escaping fluid under pressure can have sufficient force to pene-
trate the skin. Check all hydraulic lines and hoses before apply-
ing pressure. Fluid escaping from a very small hole can be
almost invisible. Use paper or cardboard, not body parts, to
check for suspected leaks. If injured, seek medical assistance
from a doctor that is familiar with this kind of injury.
Hydraulics must be bled of air before hitch operation. If the
hydraulics are not bled, the cylinders will move with jerky,
uneven motions. The hydraulics should be bled during ini-
tial hitch setup. If the hydraulics have not be bleed, or if you
replace a hydraulic component during the life of the drill,
follow these procedures.
Bleeding Tongue Cylinder
1.
Check hydraulic fluid in tractor reservoir and fill to
proper level. Add fluid to system as needed. Tongue
cylinder capacity is one-half gallon (1.89 liters).
2. Raise and safely support hitch, transport frame and
front tongue.
3. Unpin rod end of tongue cylinder. Block, wire or other-
17641
wise safely support cylinder so when rod end is fully
extended it does not contact anything.
4. Cycle cylinder completely in and out at least three
times to purge air from cylinder and hoses.
5. Fully extend cylinder and repin rod end.
6. Recheck tractor reservoir and fill to proper level.