Great Plains 3PYPA Operator Manual - Manual (Page 53)

Great Plains Manufacturing, Inc. Table of Contents Index Operating Instructions 49
03/20/2012 Table of Contents Index 401-647M
Marker Operation (Option)
Overhead, Crushing and Shearing Hazards:
Do not allow anyone to stand near or beyond the end of the
wings during marker operations. There is risk of serious injury
or death for anyone in the path of a marker. Marker arms are
heavy, are under tremendous hydraulic power, and may move
suddenly if the hydraulic system is damaged or needs bleeding.
Marker discs may be sharp.
The 3PYPA markers have two operations, which are only
performed when the wings are unfolded (page 33):
1. Tilt (forward/up and backward/down)
Markers are tilted up prior to marker unfold/fold.
Markers are left tilted up for field operations.
Markers are tilted down prior, to wing fold, for trans-
port and storage.
2. Fold (down/out and up/in)
Markers are unfolded for marking.
Markers are folded for turns and prior to alternate
side unfolding.
If markers are installed, but not required for the next field
operations, they may be left folded and tilted up or down.
CFM and Marker Switch Priority
Refer to Figure 56
The Wing Fold switch
must be OFF during all marker
operations. When the Wing Fold switch is ON, marker
switches (
/ ) are disabled.
The Tilt operation is performed before the unfold opera-
tion. The Tilt switch
must be OFF during marker fold
operations.
When the Marker Tilt switch is ON, the Marker Fold
switch is disabled.
Before Operating Markers
• Make sure cylinders are properly bled. See “Marker
Maintenance (Option)” on page 117.
• This section presumes correct marker extension for
your pass spacing. If this has not been set, or needs to
be changed, see “Marker Extension” on page 164.
• This section presumes a factory marker chain configu-
ration.
• If your chain has been replaced, or stretched, adjust
the links to the correct slack length. See “Marker
Chain Length Adjustment” on page 117.
• Markers are equipped with an automatic sequence
valve that controls which side activates, as well as
marker deployment speed. Marker folding speed is
adjusted via set screws on the sequence valve body.
Excessive folding speed may damage markers. Set
speed prior to first field operations. See “Marker
Speed Adjustment” on page 163.
Null4:
Figure 55
Marker Tilted Down
29890
Marker Fold Marker Tilt
FRAME
Wing Fold Right
CLUTCH
Center Left MASTER
Null4:
Figure 56
CFM: Switches for Markers
29891
1 2 3
3
1 2
1
1
2