Great Plains YP2425F-2470 Operator Manual - Manual (Page 58)

54 YP2425 & YP2425F Table of Contents Index Great Plains Manufacturing, Inc.
401-406M Table of Contents Index 2014-07-14
Marker Gauge Wheel Adjustment
Refer to Figure 60
The purpose of the marker support wheel
is to carry
the weight of the inner section of the marker arm.
If the wheel is not touching the ground, or is often off the
ground during marker operations, remove the bolts
and move the wheel to a lower hole.
If the marker disc is frequently off the ground, the
support wheel mount may need to be moved to a higher
set of holes.
Marker Shear Bolt Replacement
Refer to Figure 60
If a marker gets caught or hits an obstruction, it is
designed to fail a shear bolt at the fold, pivot on a pin,
and swing back.
The shear bolt is a hex head cap screw,
1 ⁄
2
-13 x 2
1 ⁄
2
inch Grade 5,
Great Plains part number 802-130C, plus a
1 ⁄
2
-13 lock nut, Great Plains part number 803-019C.
Install a replacement shear bolt on the vertical faces on
the side opposite from the pivot bolt. Do not use a higher
grade bolt, or marker hang-ups may result in machine
damage. Do not use a lower grade bolt, or you may
experience nuisance shears.
Marker Chain Length Adjustment
Great Plains suggests checking marker chain slack
every few years. If any maintenance or repairs cause the
chain to be disconnected, correct slack needs to be set
on reinstallation.
Perform any checks and adjustments with the marker
folded and tilted down into its cradle.
Refer to Figure 61
Lift the free end of the lift arm weldment
until
horizontal. Re-attach chain so that it is taut.
Ideally, the unfolding marker reaches the ground
2 to 3 feet (60 to 90 cm) before the marker is completely
unfolded.
Equipment Damage/Marker Failure Risks:
A chain length too long can result in excess loads on the
marker and nuisance shears, due to striking the ground too
early during unfolding. An under-length chain can also
prevent the marker from fully resting in the cradle when
folded. A chain too short can result in unsatisfactory marker
operations, including loss of ground contact on uneven terrain.
Figure 60
Marker Gauge Wheel & Shear Bolt
29516
2
1
3
4
1
2
3
4
Figure 61
Marker Chain Slack
26057
5
5