Bleeding fold hydraulics, Unfolded bleeding – Great Plains LC40 Operator Manual User Manual
Page 41
Great Plains Manufacturing, Inc.
Maintenance and Lubrication
37
2014-07-21
591-049M
Bleeding Fold 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 implement setup or if you replace a
part in hydraulic system during the life of the implement,
complete the following procedures.
Unfolded Bleeding
Refer to Figure 31
1.
Check hydraulic fluid level in tractor reservoir and fill
to proper level. Add fluid to system as needed.
2.
With implement 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 31
Bleeding Fold Hydraulics
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