Great Plains 2525P Operator Manual - Manual (Page 31)

Great Plains Manufacturing, Inc. Adjustments 27
2013-05-10 118-231M
Marker Speed
The procedure for adjusting marker speed is different for
dual-circuit markers with needle valves and single-circuit
markers with dual sequence valve.
Dual-Circuit/Needle Valve Speed
This applies only to markers plumbed separately (left
and right are each on their own tractor hydraulic circuit).
Refer to Figure 20
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.
Single-Circuit/Sequence Valve Speed
There is one adjustment screw for unfolding speed
and one for folding speed
. You can identify adjust-
ment 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.
Figure 20
Needle valve Adjustment
17620
1
1 2
F
S
S
Figure 21
Sequence Valve Adjustment
14048
1
2
S
F