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

Adjustments 27
01/23/2012 118-232M
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 25
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
Single-Circuit/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.
FigureSpacer
Figure 25
Needle valve Adjustment
17620
1
1 2
F
S
S
Figure 26
Sequence Valve Adjustment
14048
1
2
S
F