Bleeding wing fold cylinder hydraulics – Great Plains 3PYP Operator Manual User Manual
Page 171
Great Plains Manufacturing, Inc.
Appendix D: Older Equipment
167
2014-09-09
401-312M
Bleeding Wing Fold Cylinder Hydraulics
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.
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 without Markers (all s/n)” on page 127
“Wing Fold with Markers (all s/n)” on page 128
(both partially repeated here for reference)
2.
Check that tractor hydraulic reservoir is full.
3.
Unfold the wings. See “Unfolding The 3PYP” on
page 28 If the planter is equipped with markers,
leave the marker switches Off during this bleed.
4.
Set hydraulics for low flow rate. Disconnect the rod
ends
of both wing fold cylinders, so that they may
extend without moving the wings.
5.
Retract the wing fold circuit.
6.
Loosen the JIC fittings at both wing fold cylinder
base ends
.
7.
Set wing fold circuit to Extend until fluid emerges.
8.
Neutralize the circuit and secure the fittings.
9.
Extend the wing fold rods.
10. Loosen the JIC fittings at both wing fold cylinder rod
ends
.
11. Set wing fold circuit to Retract until fluid emerges.
12. Neutralize the circuit and secure the fittings.
13. Re-attach the rod ends to the wings.
14. Fold and unfold wings several times.
Figure 169
Wing Fold without Markers
25195
L
R
2
3
1
4
Figure 170
Wing Fold with Markers
25062
L
R
3
3
4
4
3
4
3