Great Plains CTA4000 Operator Manual - Manual (Page 20)

16 CTA4000
160-269M-A 08/03/2010
Bleed only at
JIC (Joint Industry Conference, 37 ° flare) or
NPT (National Pipe Thread, tapered thread) fittings, and
never at
ORB (O-Ring Boss) or
QD (Quick Disconnect) 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 9
2.
Set valve levers for Field operation.
Refer to Figure 10
3.
With implement unfolded, disconnect rod ends of
fold cylinders
. Place a support under the cylin-
der 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) plus any optional weights added.
5. Fully extend opener-lift cylinders.
Refer to Figure 11
6.
Turn knobs , on pressure-control valves com-
pletely counterclockwise, then turn them back far
enough (about three clockwise turns) to build up at
least 1000 psi pressure per gauges
, .
Figure 10
Fold Cylinder Supported
16432
2
1
Figure 11
Adjusting for Lift Bleed
26380
4
5
6
3
1 2
3 4
5 6