Great Plains 3N4010HDA Operator Manual - Manual (Page 66)

62 3N-4010HDA Table of Contents Index Great Plains Manufacturing, Inc.
196-444M Table of Contents Index 2013-09-24
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 61
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.
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.
Marker Chain Length
Refer to Figure 63
With marker unfolded, adjust chain to a length
of 67in (170cm)
Slowly fold marker while observing disk. If marker disk
slides across the ground more than a foot (0.3m) before
chain and linkage lifts it up, the chain is too long.
Remove bolt and shorten chain one or two links.
Check adjustment by repeating folding process.
If chain is too short when marker is unfolded, it will
prevent the marker blade from dropping into field
depressions, causing skips in the mark line. Correct this
condition by lengthening chain one or two links.
Figure 61
Needle valve Adjustment
15625
1 2
F
S
S
Figure 62
Sequence Valve Adjustment
14048
1
2
S
F
Figure 63
Marker Chain Length
18962
1
2
1
2