Great Plains 3N-3020P Operator Manual - Manual (Page 45)

4/23/2010 196-248M
43 Adjustments
Marker Adjustments
Folding Speed with Needle Valves
Refer to Figure 35
A needle valve controls the folding speed of mark-
ers that are plumbed separately. 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 adjust-
ment knob clockwise to reduce folding speed or
counterclockwise to increase folding speed. Ex-
cessive folding speed could damage markers and
void the warranty.
17620
Folding Speed with Sequence Valve
Refer to Figure 36
If markers are tied together with a sequence
valve, adjust folding speed with hex adjustment
screws on the sequence-valve body. There is one
adjustment screw for raising speed (1) and one for
lowering speed (2). Identify adjustment screws by
markings stamped in valve body.
With tractor idling at a normal operating speed,
adjust marker folding to a safe speed. Turn adjust-
ment screws clockwise to decrease folding speed
and counterclockwise to increase folding speed.
Excessive folding speed could damage markers
and void the warranty.
After adjusting the folding speed, tighten jam nuts
14048
on hex adjustment screws to hold settings.
Marker Disk Adjustment
Changing disk angle
Refer to Figure 37
If mark left by marker disk is not clearly visible, ad-
just disk angle to make a wider mark. Loosen two
1/2 inch bolts (1) holding disk assembly (2). Ro-
tate disk assembly as desired.
17676
Figure 35
Needle valve
Figure 36
Sequence valve
Figure 37
Marker disk adjustment