Bleeding fold hydraulics – Great Plains NP4000B Operator Manual User Manual
Page 137
Great Plains Manufacturing, Inc.
Maintenance and Lubrication
133
2014-05-14
417-199M
Bleeding Fold Hydraulics
Normally the fold hydraulics are bled at the factory before
shipping, and bleeding should not be required.
1.
Connect the fold/lift circuit to a hydraulic source,
such as a tractor remote.
2.
Set the source circuit to Float to relieve any pressure
in the lines.
3.
Disconnect both base and rod ends of all fold
cylinders.
4.
Support the cylinders with ports facing up, and with
cylinders oriented so that rods cannot strike
applicator parts when at full extension.
5.
Orient cylinders with base ends higher than rod
ends. Set fold/lift circuit to Neutral.
One cylinder at a time:
6.
Crack (slightly loosen) a JIC connection at a fold
cylinder base end.
7.
Extend the fold/lift circuit slowly until fluid appears at
the fitting.
8.
Set the fold/lift circuit to Neutral. Tighten the fitting.
9.
Repeat step 6 through step 8 for the remaining
cylinders.
10. Retract the fold cylinders. Set fold/lift circuit to
Neutral.
11. Orient cylinders with rod ends higher than base
ends.
One cylinder at a time:
12. Crack (slightly loosen) a JIC connection at a fold
cylinder rod end.
13. Extend the fold/lift circuit slowly until fluid appears at
the fitting.
14. Set the fold/lift circuit to Neutral. Tighten the fitting.
15. Repeat step 12 through step 14 for the remaining
cylinders.
16. Set fold/lift circuit to Float.
17. Re-pin base and rod ends of cylinders to center
section and wing lugs.
18. Test fold function carefully.
Crushing and Equipment Damage Hazards:
Bleed after servicing fold cylinders or their hoses. Air in the
system makes it hazardous to fold the applicator. If it is
necessary to service fold hydraulics while folded, the first
unfold is especially dangerous. Wing motion can be uneven or
jerky in fold. Unfolding wings could fall suddenly. Anyone
nearby could be seriously injured or killed. Equipment damage
is likely.
High Pressure Fluid Hazard:
Wear safety goggles and gloves. The bleed procedure requires
partially opening pressurized hydraulic lines. Escaping fluid
under pressure can penetrate the skin, causing serious injury.
If an accident occurs, seek immediate medical assistance from
a physician familiar with this type of injury.