Great Plains 2SNG30 Operator Manual - Manual (Page 22)

2SNG24 & 2SNG30
202-499m 8/17/2006
20
Bleeding Hydraulics (Cont.)
!
DANGER
The following section describes a bleeding procedure
that requires you to crack (loosen) a hydraulic fitting.
Be aware that these lines may be under pressure even
with the tractor shut off. Never allow anyone under the
drill when a fitting is opened. Escaping fluid may allow
the drill to suddenly drop. Be aware of the following
medical alert.
!
WARNING
Escaping fluid under pressure can have sufficient pres-
sure to penetrate the skin. Check all hydraulic lines
and fittings before applying pressure. Fluid escaping
from a very small hole can be almost invisible. Use pa-
per or cardboard, not body parts, and wear heavy
gloves to check for suspected leaks. If injured, seek
medical assistance from a doctor that is familiar with
this type of injury. Foreign fluids in the tissue must be
surgically removed within a few hours or gangrene
will result.
Bleeding Folding Hydraulics
Note: The drill transport lift systems should be
completely operational before attempting to work
with the folding hydraulic circuit.
Note: The cylinders are double acting but are not
the rephasing type.
1. The first step in charging the fold hydraulic cir-
cuit is to make sure the tractor hydraulic fluid
reservoir is filled to the proper level. System
capacity is approximately 2 gallons and re-
quires one pair of remote outlets. If optional
selector is used, rotate to the wing lift position.
2. With the drill fully raised and in the folded po-
sition, disconnect the rod end pin on each fold
cylinder and block the cylinders in a location
where they are free to extend and retract with-
out contacting anything.
3. Cycle the fold cylinders in and out several
times to work the air out of the system.
Refer to Figure 6
Note: If the wing fold cylinders do not operate
properly, clean out the small hole in the elbow fit-
ting on fold cylinders. These orifice are located in
the cylinder elbow as circled.
Figure 6
Wing Fold Hydraulics
4. Retract the hydraulic cylinder and repin the
rod ends.
5. Recheck the tractor reservoir level and add
clean fluid as necessary.
6. It is advisable to fold and unfold the drill sever-
al times. The majority of the air should now be
expelled from this system. The remaining air
will gradually be pushed to the tractor during
day to day operations.