Great Plains 3N4010HDA Operator Manual - Manual (Page 59)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 55
2013-09-24 Table of Contents Index 196-444M
Bleeding Fold cylinders
Note: Unfolding drill retracts fold cylinders.
Note: If markers are on a selector valve, select Fold at
that valve for this procedure.
1. Unpin rod ends of fold cylinders. Pivot cylinders up
and wire or otherwise safely support rod ends higher
than base ends.
2. With the tractor engine at idle speed, energize the
fold hydraulics. When the cylinders have extended
completely, hold the remote lever on for one minute.
Check all hydraulic hoses, cylinders and fittings for
leaks.
3. Retract the cylinder rods. Extend the rods again and
hold the remote lever on for one more minute.
Repeat this step two more times.
4. Again, check all hydraulic hoses, cylinders and fit-
tings for leaks. Recheck the tractor hydraulic reser-
voir. Fill to the proper level.
5. Re-pin both cylinders.
Adjusting Fold Cylinders
Refer to Figure 53
If the drill does not fold or unfold fully it may be
necessary to add or remove shims from the base of the
wing fold cylinder.
1. With the drill in the folded or unfolded position make
sure drill is on level ground and all safety locks are in
place.
2. Place tractor in park, turn off ignition and remove
ignition key.
3. Remove bolts from cylinder base plate and add or
remove shims as necessary.
4. Tighten fold cylinder base bolts and activate fold cyl-
inders to make sure wings travel to full open and full
closed position. If not repeat above steps until full
open and full closed are achieved.
Figure 53
Fold Cylinder Shims
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