Great Plains 3S-4010HDF Operator Manual - Manual (Page 77)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 73
03/28/2012 196-522M
Marker Maintenance
If grease-seal cap for marker-disk-hub bearings is dam-
aged or missing, disassemble and clean hub. Repack
with grease and install a new seal or grease cap.
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.
1. Check that tractor hydraulic reservoir is full. Review
“Marker Operation” on page 30.
2. With both markers lowered into field position, loosen
hydraulic-hose 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 Speed
The procedure for adjusting marker speed is different for
single marker with needle valve and dual markers with
sequence valve.
Single Marker/Needle Valve Speed
Refer to Figure 87
A needle valve controls the folding speed. The needle
valve is near the rod end of the marker cylinder.
With tractor idling at a normal operating speed, adjust
marker folding to a safe speed. Turn adjustment knob
clockwise to reduce folding speed or counterclockwise to
increase folding speed. Excessive folding speed could
damage markers and void the warranty.
FigureSpacer:
Dual-Marker/Sequence Valve Speed
There is one adjustment screw for unfolding speed
and one for folding speed
. You can identify adjustment
screws by markings stamped in valve body.
Turn adjustment screws clockwise ( : slower) to
decrease [un]folding speed and counterclockwise
(
: faster) to increase [un]folding speed.
With tractor idling at a normal operating speed, adjust
marker folding to a safe speed. Excessive [un]folding
speed could damage markers and void the warranty.
After adjusting the folding speed, tighten jam nuts on hex
adjustment screws to hold settings.
Bleed only at:
JIC (Joint Industry Conference, 37 ° flare) or
NPT (National Pipe Thread, tapered thread) fittings.
Never bleed at:
ORB (O-Ring Boss) or
QD (Quick Disconnect) fittings.
JIC fittings do not require high torque. JIC and O-ring fittings
do not require sealant. Always use liquid pipe sealant when
adding or replacing (NPT) pipe-thread fittings. To avoid
cracking hydraulic fittings from over tightening, and to keep
tape fragments from clogging filters, do not use plastic sealant
tape.
Overhead/Crushing Hazard:
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.
FigureSpacer:
Figure 87
Needle valve Adjustment
15625
1 2
F
S
S
FigureSpacer:
Figure 88
Sequence Valve Adjustment
14048
1
2
S
F