Bleeding folding hydraulics – Great Plains 2SF30 Operator Manual User Manual
Page 23
Great Plains Manufacturing, Inc.
Preparation and Setup
19
2014-01-09
155-015M-A
Bleeding Folding Hydraulics
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 fittings are opened. Escaping fluid may allow the
drill to suddenly drop. Be aware of the following medical
alert.
High Pressure Fluid Hazard:
Escaping fluid under pressure can have sufficient force to
penetrate the skin. Check all hydraulic lines and hoses before
applying pressure. Fluid escaping from a very small hole can
be almost invisible. Use paper or cardboard, not body parts, to
check for suspected leaks. If injured, seek medical assistance
from a doctor familiar with this kind of injury.
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 circuit is
to make sure the tractor hydraulic fluid reservoir is
filled to the proper level. System capacity is
approximately 2 gallons and requires 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 position,
disconnect the rod end pin on each fold cylinder and
block the cylinders in a location where they are free
to extend and retract without contacting anything.
3.
Cycle the fold cylinders in and out several times to
work the air out of the system.
Note: If the wing fold cylinders do not operate properly,
clean out the small hole in the elbow fitting on fold
cylinders. These orifice are located in the cylinder
elbow as circled in Figure 8.
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 several
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.
Figure 8
Wing Fold Hydraulics
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