Bleeding hydraulics, Unfolded bleeding – Great Plains 3P4025AH Operator Manual User Manual
Page 91
Great Plains Manufacturing, Inc.
Maintenance and Lubrication
87
2014-07-29
411-099M
Bleeding Hydraulics
To function properly, the hydraulics must be free of air. If
hydraulics have not been bled, they will operate with
jerky, uneven motions and could cause wings to drop
rapidly during folding or unfolding. If hydraulics were not
bled during initial planter setup or if you replace a part in
hydraulic system during the life of the planter, complete
the following procedures.
Unfolded Bleeding
Refer to Figure 95
1.
Check hydraulic fluid level in tractor reservoir and fill
to proper level. Add fluid to system as needed.
2.
With planter unfolded and fold cylinders completely
extended, disconnect rod end pins and swing the
cylinders so they will not contact anything when
extended.
3.
Loosen rod end hose fittings
Note: Do not loosen an O-ring boss (ORB) connection
for bleeding. Bleeding at an ORB damages the
seal.
4.
Slowly supply oil to rod end of fold cylinders until oil
appears at loosened hose fitting. Tighten fitting and
completely retract fold cylinders.
5.
With cylinders completely retracted, loosen base end
hose fittings
6.
Slowly supply oil to base end of fold cylinders until oil
appears at loosened hose fitting. Tighten base end
hose fitting and cycle fold cylinders in and out
several times.
7.
Re-pin cylinder rod clevises.
High Pressure Fluid Hazard:
Relieve pressure before disconnecting hydraulic lines.
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin causing serious injury. Use a piece of paper
or cardboard, NOT BODY PARTS, to check for leaks. Wear
protective gloves and safety glasses or goggles when working
with hydraulic systems. If an accident occurs, seek immediate
medical attention from a physician familiar with this type of
injury.
Figure 95
Bleeding Fold Hydraulics
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