Great Plains YP1625 Operator Manual - Manual (Page 85)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 81
03/12/2012 401-226M-A
Bleeding Hydraulics
High Pressure Fluid Hazard:
Escaping fluid under pressure can have sufficient pressure to
penetrate the skin causing serious injury. Avoid the hazard by
relieving pressure before disconnecting 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.
Only trained personnel should work on system hydraulics!
Bleeding Lift Hydraulics
Normally the lift hydraulics are bled at the factory before
shipping and bleeding should not be required other than
to raise fully and hold lever on for one minute or until all
cylinders extend fully.
Bleeding 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 fold or unfold without first raising planter completely.
If the fold and hold procedure does not clear the prob-
lem, perform the following steps:
1. Raise and unfold the planter.
2. Un-pin all fold cylinders (two at center, one each
gauge wheel).
Refer to Figure 117
3.
Locate the re-phase port on each cylinder. This is a
raised blind weldment on one end of the cylinder
tube. This is the rod end on gauge wheel fold cylin-
ders, and the base end on center fold cylinders.
4. Support the cylinder with the re-phase port facing up,
and that end of the cylinder elevated.
5. Fully extend all cylinders at low flow. Hold circuit for
one minute.
6. Fully retract all cylinders at low flow. Hold circuit for
one minute.
7. Set circuit to neutral and re-pin all cylinders
JIC fittings do not require high torque. JIC and O-ring fit-
tings do not require sealant. Always use liquid pipe sealant
when adding or replacing (NPT) pipe-thread fittings. To
avoid cracking hydraulic fittings from over tightening, and to
keep tape fragments from clogging filters, do not use plastic
sealant tape.
FigureSpacer:
Figure 117
Cylinder Re-Phase Port
29502