Bleeding hydraulics, Bleeding lift hydraulics – Great Plains CTA4000 Predelivery Manual User Manual
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CTA4000 & CTA4000HD
Great Plains Manufacturing, Inc.
160-037Q
2013-08-21
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. During initial
implement setup complete the following procedures.
Escaping fluid under pressure can penetrate skin, causing
serious injury. Avoid the hazard by relieving pressure before
disconnecting or “cracking” hydraulic lines. 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.
Bleed only at a JIC (Joint Industry Conference, 37
° flare) or
NPT (National Pipe Thread, tapered thread) fittings, and never
at ORB (O-Ring Boss) fittings.
Bleeding Lift Hydraulics
1.
Check hydraulic fluid level in tractor reservoir and fill
to proper level. Filling a completely empty lift cylinder
set requires about 2 gallons of oil.
Refer to Figure 14
2.
Set valve levers for Field operation.
Refer to Figure 15
3.
With implement still unfolded, and fold cylinder rod
ends
still disconnected, place a support
under
the cylinder end so extending rods will not contact
anything.
Note: Although the Fold cylinder valve handle is set to
Field, Fold cylinders may still be activated by the
Weight Transfer circuit.
4.
Jack up and support implement frame high enough
so opener cylinders can be fully extended. Use a
jack set rated for the weight of the implement (see
Appendix of Operator’s Manual).
5.
Fully extend opener-lift cylinders.
Refer to Figure 16
6.
Turn knobs
,
on pressure-control valves
completely counterclockwise, then turn them back
far enough (about three clockwise turns) to build up
at least 1000 psi pressure per gauges
,
.
Figure 14
Levers for Lift Bleed
26372
2
1
Figure 15
Fold Cylinder Supported
16432
1
2
4
5
6
3
Figure 16
Adjusting for Lift Bleed
26380
3
4
5
6