Bleeding opener lift hydraulics – Great Plains 2S-2600HDF Operator Manual v1 User Manual
Page 73
Great Plains Manufacturing, Inc.
Maintenance and Lubrication
69
2014-05-16
195-440M
Bleeding Opener Lift Hydraulics
Refer to Figure 74
1.
Review warnings, bleeding notes and system infor-
mation on page 68.
2.
Make sure opener frames are locked up in ROAD
position. Refer to Opener Lock Up, page 23.
3.
Turn knob on both pressure-control valves
com-
pletely counterclockwise, then turn valves clockwise
far enough to build up 1000 psi (about three turns).
4.
Turn knob on bypass valve
completely clockwise
for no oil flow.
5.
Loosen two hose-end JIC fittings
on the
opener-lift circuit where these center two hoses tee
at the middle of the mainframe.
6.
Slowly supply oil to top side of pressure-control
valves until oil begins to appear at a loosened hose
fitting. As oil begins to appear at a fitting, tighten that
fitting.
7.
Slowly supply oil to bottom side of pressure-control
valves until oil begins to appear at remaining loos-
ened hose fitting. As oil begins to appear at the fit-
ting, tighten fitting. Continue to supply oil to bottom
side of pressure-control valves until all openers are
raised completely.
8.
Move opener transport locks to FIELD position and
cycle openers up and down ten times. Each time you
lower openers, hold tractor remote lever until opener
circuit builds up to pressure set at control valves.
9.
After cycling openers, return opener transport locks
to ROAD position, and lock openers up.
Figure 72
Bleeding Opener Lift Hydraulics
22981
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2
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