Great Plains YP1625 Operator Manual - Manual (Page 86)

82 YP1225 and YP1625 Great Plains Manufacturing, Inc.
401-226M-A 03/12/2012
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be free of
air. If the markers fold in jerky, uneven motions, follow
these steps.
Check that tractor hydraulic reservoir is full.
1. Set the solenoid to marker operation.
2. With both markers lowered into field position, loosen
hydraulic-hose JIC fittings at rod and base ends of
marker cylinders. If applicable, loosen fittings on
back side of sequence valve.
3. With tractor idling, activate tractor hydraulic valve
until oil seeps out around a loosened fitting. Tighten
that fitting.
4. Reactivate tractor hydraulic valve until oil seeps out
around another loosened fitting. Tighten that fitting.
Repeat process until all loosened fittings have been
bled and tightened.
End of “Bleeding Hydraulics”.
Marker Maintenance
Refer to Figure 118
The marker arm is attached to the marker body with a
1 ⁄
2
-13 x 2 1 ⁄
2
in Grade 5 shear bolt. If shear bolt breaks,
replace it with a Great Plains part 802-130C or equiva-
lent.
Note: Replacing shear bolt with a lower grade can result
in nuisance shears.
Marker Damage Risk:
Replacing shear bolt with a higher grade bolt can result in
marker damage.
If grease seal cap for marker-disk-hub bearings is dam-
aged or missing, disassemble and clean hub. Repack
with grease and install new seal or grease cap.
Crushing and Sharp Object Hazards:
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 planter when folding or
unfolding the markers.
FigureSpacer:
Figure 118
Marker Shear Bolt
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