Great Plains V-300F Operator Manual - Manual (Page 105)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 101
11/15/2007 148-057M-A
Marker Maintenance
See also:
“Marker Setup” on page 25,
“Marker Operation” on page 40
Bleeding Marker Hydraulics
!
CAUTION
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics
fail. Never allow anyone near the drill when folding or unfold-
ing the markers.
1. Check that tractor hydraulic reservoir is full.
Refer to Figure 113
2.
Extend a marker.
3. Loosen hydraulic-hose JIC fittings at rod and base
ends of the marker cylinder.
4. Loosen fittings on back side of sequence valve for
that side.
5. With tractor idling, activate tractor hydraulic valve to
extend marker, until oil seeps out around a loosened
fitting. Tighten that fitting.
6. Re-activate (for extend) until oil seeps at another fit-
ting. Tighten it.
Note: The markers are controlled by an automatic se-
quence valve, which can complicate bleeding. If the
marker on the other side begins moving before you
intend it, momentarily reverse the lever for the cir-
cuit.
7. Reverse the tractor hydraulic valve (to retract) until
oil seeps out around the loosened fitting on the other
end of the cylinder or sequence valve port. Tighten
that fitting.
8. Re-activate (for retract) until there is seepage at the
final loose fitting on that side. Tighten the fitting.
9. Fully retract the marker on that side.
10. Repeat step 2 through step 9 for the other side.
Figure 113
Marker Cylinder Bleed
17873