Great Plains CTA4000 HD Operator Manual - Manual (Page 26)

22 CTA4000HD Great Plains Manufacturing, Inc.
160-037M 2012-11-28
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 17
2.
Set valve levers for Field operation.
Refer to Figure 18
3. With implement unfolded, disconnect rod ends of
fold cylinders
. 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) plus any optional weights added.
5. Fully extend opener-lift cylinders.
Refer to Figure 19
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 18
Fold Cylinder Supported
16432
2
1
Figure 19
Adjusting for Lift Bleed
26380
4
5
6
3
1 2
3 4
5 6