Wing fold cylinder bleeding – Great Plains 3PYPA Operator Manual User Manual
Page 120
116
3PYPA
Great Plains Manufacturing, Inc.
401-647M
03/20/2012
Wing Fold Cylinder Bleeding
Normally the fold hydraulics are bled at the factory before
shipping, and bleeding should not be required other than
to fold fully and hold lever on for one minute or until all
cylinders reach the end of their stroke.
Crushing and Equipment Damage Hazards:
Do not unfold planter if significant bleeding is necessary. It is
not safe to unfold with air in the fold system.
If significant air is suspected, skip step 5.
1.
Consult appropriate flex circuit hydraulic diagram for
your planter:
“Wing Fold Hydraulics (no Markers)”, page 144, or
“Wing Fold and Marker Hydraulics”, page 145
(partially repeated here for reference)
2.
If a leak or component failure is suspected, correct it
before proceeding.
3.
Check that tractor hydraulic reservoir is full.
4.
If the planter wings are folded, safety chain the wings
together before proceeding.
5.
If safe, unfold the wings (page 33). If the planter has
markers, leave the marker switch Off during this
bleed.
Refer to Figure 139 or Figure 140
6.
Set hydraulics for low flow rate. Disconnect the rod
ends
of both wing fold cylinders, so that they may
extend without moving the wings.
7.
Retract the wing fold circuit.
8.
Loosen the JIC fittings at both wing fold cylinder
base ends
.
9.
Set wing fold circuit to Extend until fluid emerges.
10. Neutralize the circuit and secure the fittings.
11. Fully extend the wing fold cylinder rods.
12. Loosen the JIC fittings at both wing fold cylinder rod
ends
.
13. Set wing fold circuit to Retract until fluid emerges.
14. Neutralize the circuit and secure the fittings.
15. Fully retract the wing fold cylinder rods.
16. Cycle the circuit to fully extend then fully retract both
cylinders. Repeat this two times.
17. Re-attach the rod ends to the wings.
18. Unchain as needed and fold and unfold wings sev-
eral times.
Null4:
Figure 139
Wing Fold without Markers
25195
L
R
8
7
7
8
Null4:
Figure 140
Wing Fold with Markers
25062
L
R
7
7
8
8
7
8
7