Great Plains 3SF45 Operator Manual - Manual (Page 17)

4/8/99
2-5
170-062M
BLEEDING THE HYDRAULIC SYSTEMS (CON’T.)
THE FOLLOWING SECTIONS DESCRIBE A BLEEDING PROCEDURE THAT REQUIRES YOU TO CRACK (LOOSEN) A HYDRAU-
LIC 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 SUDDEN-
LY DROP. BE AWARE OF THE FOLLOWING MEDICAL ALERT.
CAUTION!
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 THAT IS FAMILIAR WITH THIS KIND OF INJURY.
FOREIGN FLUIDS IN THE TISSUE MUST BE SURGICALLY REMOVED WITHIN A FEW HOURS OR
GANGRENE WILL RESULT.
!
BLEEDING THE FOLDING HYDRAULICS
NOTE: The drill lift systems should be completely opera-
tional BEFORE attempting to work with the folding hy-
draulic circuit.
NOTE: The cylinders are double acting, but 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 2.19
gallons for the 36’ drill and 2.83 gallons for the 45’ drill and
requires 1 pair of remote outlets. Switch selector valve
mounted on the main frame to wing lift position.
2. With the drill fully raised and in the folded position, dis-
connect 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 orific plate on fold cylinder.
These orifice plates are located in the cylinder po t be-
neath the elbow adapter on the rod end of each fold cylin-
der as shown in Fig. 3.
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.
Wing Fold Hydraulics
Fig. 3
11391
Orifice Plat
Location
Orifice Plat
Location