Great Plains 1300 13-Foot Operator Manual - Manual (Page 48)

44 1300 and 1300F Table of Contents Index Great Plains Manufacturing, Inc.
175-157M Table of Contents Index 2014-04-15
Marker Maintenance
Marker Speed Adjustment
Refer to Figure 42
Adjust folding speed for dual markers with hex
adjustment screws on sequence valve body. There is an
adjustment screw for raising speed
and one for
lowering speed . You can identify adjustment screws
by markings stamped in the valve body.
Turn adjustment screws clockwise to decrease folding
speed and counterclockwise to increase folding speed.
With tractor idling at normal operating speed, adjust
marker folding to a safe speed. Excessive folding speed
could damage markers and void the warranty.
After adjusting folding speed, tighten jam nuts on hex
adjustment screws to hold settings.
Marker Shear Bolt
Refer to Figure 43
If a marker gets caught or hits an obstruction, it is
designed to fail a Grade 5 shear bolt
at the fold, pivot
on a pin, and swing back. If the bolt shears, chances are
the washers and lock nut will be lost as well.
The replacement parts are:
802-197C HHCS 5/16-18X2 3/4 GR5
803-011C NUT LOCK 5/16-18 PLT
804-010C WASHER FLAT 5/16 USS PLT
Install the replacement bolt from implement front.
Equipment Damage Risk:
Using a lower Grade bolt can result in nuisance shears.
Using a higher Grade bolt can result in machine damage.
Using lower strength washers can result in machine damage.
Using a plain nut can result in non
-shear arm swings as the
nut loosens.
If exact replacement parts are not immediately available,
temporarily substitute a metric M8 Class 8.8 bolt, heavy
duty washers and lock nut. If a lock nut is not available,
insert a split lock washer in between the nut and the rear
flat washer.
Marker Grease Seal Cap Check
If grease-seal cap for marker-disk-hub bearings is
damaged or missing, disassemble and clean hub.
Repack with grease and install a new seal or grease cap.
Figure 42
Marker Extension Adjustment
14048
F
S
S
1
2
Crushing and Sharp Object Hazards:
Keep all persons well clear of markers during lift/lower
marker fold/unfold operations. Un
-pinned markers fold and
unfold when the lift circuit is extended or retracted. Markers
have multiple pinch points. Lowering arms can crush. Marker
disks are sharp.
1
2
31
31
32
33
Figure 43
Marker Shear Bolt
36276
32
31
33
33