Great Plains 1520P Operator Manual - Manual (Page 42)

1510P and 1520P
118-732M 5/6/2010
40
Tighten that fitting. Repeat process until all
loosened fittings have been bled and tight-
ened.
Folding Speed with Needle Valves
Refer to Figure 46
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.
Refer to Figure 47
Folding Speed with Sequence Valve
If markers are tied together with an optional se-
quence 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 adjust-
ment 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
on hex adjustment screws to hold settings.
Marker Disk Adjustment
Marker disks may be sharp. Use caution when making
adjustments in this area
Refer to Figure 48
Changing disk angle. If mark left by marker disk
is not clearly visible, adjust disk angle to make a
wider mark. Loosen two
1 ⁄
2 inch bolts (1) holding
Figure 46
Needle Valve
17620
Figure 47
Speed Adjustment, Sequence Valve
14048
Hex adjustment
screws
Increase
speed
Decrease
speed
Figure 48
Disk Angle
17676