Great Plains 3S-4010HDF Operator Manual - Manual (Page 68)

64 3S-4010HD and 3S-4010HDF Great Plains Manufacturing, Inc.
196-522M 03/28/2012 E
Bleeding Hydraulics
This section covers standard drill hydraulics. See also
“Bleeding Marker Hydraulics” on page 73.
Bleeding Lift Hydraulics
The lift system is equipped with re-phasing hydraulic cyl-
inders requiring a special procedure for bleeding air from
the system. Read and follow the procedure carefully.
1. Lower drill to ground.
2. Unpin rod ends of all six lift cylinders. Pivot cylinders
up and wire or otherwise safely support rod ends
higher than base ends. You may need to remove the
gauge-wheel cylinders from the rockshaft so you can
orient them with rod ends higher than base ends.
3. With the tractor engine at idle speed, energize the lift
hydraulics. Set flow to 6-8 gpm (23-30 liters/min.).
When the cylinders have extended completely, hold
the remote lever on for one minute. Check all hydrau-
lic hoses, cylinders and fittings for leaks.
4. Retract the cylinder rods. Extend the rods again and
hold the remote lever on for one more minute.
Repeat this step two more times.
5. Again, check all hydraulic hoses, cylinders and fit-
tings for leaks. Recheck the tractor hydraulic reser-
voir. Fill to the proper level.
6. Re-pin all cylinders.
Bleeding Fold and Lock Cylinder Hydraulics
The fold system is equipped with re-phasing hydraulic
cylinders requiring a special procedure for bleeding air
from the system. Read and follow the procedure care-
fully.
Bleeding Lock cylinders
1.
Unpin the small lock cylinders, pivot cylinders so the
rod end is free to move.
2. Crack fittings at base end of cylinders. Extend cylin-
ders to purge air from system. Tighten fittings.
3. Crack fittings at rod end of cylinders. Retract cylin-
ders to purge remaining air from system. Tighten fit-
tings.
4. Repeat step 2 and step 3.
5. Re-pin small lock cylinders.