Great Plains 2SBM30 Operator Manual - Manual (Page 13)

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11 5/3/05 Great Plains Mfg., Inc.
Section 3 Hydraulics
2SBD30 30-Foot, Folding, Soybean Machine 173-086M
Bleeding The Lift Hydraulics
This folding machine is equipped with rephasing type
hydraulic lift cylinders that require a special procedure
for bleeding air from the hydraulic system. If your dealer
has not already prepared the cylinders for transport use,
read the following information carefully. The rephasing
cylinders will not function properly if this bleeding proce-
dure is not followed. Do not crack hose fittings in order
to bleed cylinders.
1. If required, raise your machine 1" in order to extend
your lift cylinders a little. Loosen the jam nuts on top
of the transport vertical tubes and screw the adjust-
ment screw in until it bottoms. Lower the machine a
small amount until the cylinders become loose.
2. Unpin the cylinders from the main frame and turn
the cylinders upside down to a position where the
rod end is higher than the base end. Support the cyl-
inders in a safe location. One transport tire may
have to be removed in order to unpin the master cyl-
inder.
3. Start the tractor and run the engine at idle. With the
rod end of the cylinders higher than the base end,
hydraulically extend the cylinders and hold the trac-
tor control lever in position for sixty seconds after the
cylinders have extended to their maximum stroke.
4. Hydraulically retract the cylinders, then repeat the
extending procedure several more times until both
cylinders are free of air and operate together.
5. Repin the cylinders to the main frame, rod end
down. If air is trapped in either cylinder, the affected
cylinder will have a spongy, erratic movement and
the machine will not raise evenly. Refill the tractor
hydraulic fluid reservoir to its proper level.
NOTE: Check the hydraulic fluid level in the tractor
reservoir and fill to the proper level before starting
this procedure. If the bleeding process is performed
with a low reservoir supply, there is a chance of draw-
ing air into the system. System capacity is approxi-
mately 3.3 gallons.
NOTE: After machine is raised, a slight settling will
occur due to the action of the rephasing cylinders.
IMPORTANT: When using sealant on pipe threads, the
friction between the threads is reduced; therefore, be
certain not to over tighten causing damage to the cylin-
ders, valves, or fittings.
Bleeding The Folding Hydraulics
1. With the machine unfolded & lowered to the ground.
Unpin the rod end of each fold cylinder and support
cylinders so it will not fall.
2. Make sure the tractor hydraulic fluid reservoir is
filled to the proper level. System capacity is approx-
imately 1/2 gallon and requires 1 remote outlet.
3. Hook up the folding cylinder hydraulic hoses to the
tractor remote outlets.
4. Loosen the hose connection at the base end of each
cylinder.
5. With the tractor at idle, slowly work the tractor re-
mote lever to extend the cylinders.
6. When the cylinders are fully extended, tighten the
two base end connections.
7. Repeat the procedure with the hose connection at
the rod end ports.
8. Reconnect hydraulic cylinders.
9. Refill the tractor hydraulic fluid reservoir to its proper
level.
10. If the fold cylinders do not operate properly, clean
out small orifice hole in fittings circled on fold hy-
draulics illustration, Figure 3-1.
NOTE: The Bean Machine lift system should be com-
pletely operational before attempting to set up the
folding hydraulic circuit.
NOTE: The JIC type hose connections do not re-
quire sealant or high torque for a good seal when re-
connecting.
NOTE: The lift cylinders are rephasing type cylin-
ders. This bleeding procedure will not work on
rephasing cylinders. See “Section 2 Bleeding Lift
Hydraulics” on page 11 for correct bleeding proce-
dure.
Section 3
Hydraulics