Great Plains CP1000 Operator Manual - Manual (Page 14)

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Section 1 Preparation and Setup
CP1000 Three-Meter Drill and Hitch 148-358M 7/5/2005
Great Plains Mfg., Inc.
5. Start tractor and run engine at idle speed. With rod
ends higher than base ends, hydraulically extend cyl-
inders. After cylinder rods are fully extended, continue
to hold control lever for one minute before hydrauli-
cally retracting cylinders.
6. Repeat step 5 three times to completely bleed system.
If air is still trapped in either cylinder, it will operate in
jerky, erratic motions. Repeat steps until cylinder
movement is smooth and even.
7. Repin cylinders to hitch frame. Reinstall short com-
pression springs on cylinder-support-brace bolts and
re-tighten 1/2-inch nylock nuts until springs are com-
pressed to 32 mm (1 1/4 inches). If for any reason the
1/2-inch jam nuts in centre of support-brace bolts
were changed, refer to Transport Cylinder Support
Brace, page 34, for proper adjustment.
8. Refill tractor hydraulic-fluid reservoir to proper level.
Bleeding Marker Hydraulics
!
CAUTION!
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics fail.
Never allow anyone near the drill when folding or unfolding the
markers.
1. Check that tractor hydraulic reservoir is full.
2. With both markers lowered into field position, loosen
hydraulic-hose fittings at rod and base ends of marker
cylinders. Loosen fittings on back side of sequence
valve.
3. With tractor idling, activate tractor hydraulic valve until
oil seeps out around a loosened fitting. Tighten that fit-
ting.
4. Reactivate tractor hydraulic valve until oil seeps out
around another loosened fitting. Tighten that fitting.
Repeat process until all loosened fittings have been
bled and tightened.
IMPORTANT: Never bleed an O-ring fitting. Instead,
bleed a nearby pipe or JIC fitting.
IMPORTANT: JIC fittings do not require high torque.
JIC and O-ring fittings do not require sealant. Always
use liquid pipe sealant when adding or replacing pipe-
thread fittings. To avoid cracking hydraulic fittings from
over tightening, do not use plastic sealant tape.
Connect hydraulic hoses from tongue cylinder to one trac-
tor remote valve. Connect hoses from transport-lift cylin-
ders to another tractor remote valve.
Bleeding Hydraulic Systems
For safe and smooth operation, the hydraulic systems
must be free of air. The hydraulic systems should be bled
during initial implement set-up. If they were not bled, or if
you replace a hydraulic component during the life to the
drill, bleed the hydraulics.
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 1.89 litres (one-half gallon).
2. Raise and safely support hitch, transport frame and
front tongue.
3. Unpin rod end of tongue cylinder. Block, wire or oth-
erwise 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.
Bleeding Transport Lift Cylinders
The transport-lift cylinders are rephasing cylinders and re-
quire a special procedure for bleeding air from the circuit.
Read and follow procedure carefully. Cylinders will not
function properly with air in the hydraulic circuit.
1. Check hydraulic fluid in tractor reservoir and fill to
proper level. Add fluid to system as needed. Trans-
port-lift-cylinder capacity is about 7.57 litres (2 gal-
lons).
2. Jack up and support hitch frame.
3. Remove 1/2-inch nylock nuts (1) on spring side of cyl-
inder-support brace. Unpin cylinders. Do not alter po-
sition of jam nuts (2) on centre of support-brace bolts.
Figure 1-9
Unpin Cylinders
4. Turn cylinders to a position where rod ends are higher
than base ends. Support cylinders in a safe location.
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