Great Plains 1625AHL Operator Manual - Manual (Page 120)

116 1625AH Table of Contents Index Great Plains Manufacturing, Inc.
411-020M Table of Contents Index 2014-04-21
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.
Marker Maintenance
Refer to Figure 113
The marker arm is attached to the marker body with a
1 ⁄
2
-13
×2 1 ⁄
2
inch Grade 5 shear bolt. If shear bolt breaks,
replace it with a Great Plains part 802-130C or
equivalent.
Note: Replacing shear bolt with a lower grade can result
in nuisance shears.
Equipment Damage Risk:
Replacing shear bolt with a higher grade bolt can result in
marker damage. Replacing the shear bolt with a lower grade
can result in nuisance shears.
Note: If an identical Grade 5 bolt is not immediately
available, temporarily substitute a a metric
M12
×1.5 6.4 mm length Class 8.8 bolt and nut.
If grease seal cap for marker-disk-hub bearings is
damaged or missing, disassemble and clean hub.
Repack with grease and install new seal or grease cap.
Crushing and Sharp Object Hazard:
Never allow anyone near the planter when folding or
unfolding the markers. You may be injured if hit by a folding or
unfolding marker. Markers may fall quickly and unexpectedly
if the hydraulics fail.
Figure 113
Marker Shear Bolt
24408