Great Plains CP1000 Predelivery Manual - Manual (Page 8)

5 10/16/08 CP1000 Three-Meter Drill and Hitch 148-358Q
Great Plains Mfg., Inc.
To distinguish hoses on the same hydraulic circuit, refer to
plastic hose holder. See Figure 2-6. Connect hose under
extended cylinder to outlet you choose for cylinder exten-
sion. Connect hose under retracted symbol to outlet for
cylinder retraction.
17641
Figure 2-6
Hydraulic Hose Color Ties
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. Bled the hydraulic systems during ini-
tial implement set-up.
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 other-
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. Re-check 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.
17864
Figure 2-7
Unpin Cylinders
4. Turn cylinders to a position where rod ends are higher
than base ends. Support cylinders in a safe location.
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 in the operator’s manual for proper adjustment.
8. Refill tractor hydraulic-fluid reservoir to proper level.