Great Plains YP825A Operator Manual - Manual (Page 110)

106 YP425A, YP625A and YP825A Table of Contents Index Great Plains Manufacturing, Inc.
401-651M Table of Contents Index 2014-08-15
Drive-Line Shear Pin
Refer to Figure 119
The spirol pin
that connects main transfer shaft
collar to the transmission shears if an excessive load
is put on the shaft.
Infrequent or improper lubrication causes binding of
moving parts within the planter. This binding can cause
the spirol pin to shear, preventing more serious damage
to other planter parts.
Machine Damage / Nuisance Shear Risks:
Do not use arbitrary spirol pins. Replace sheared pins with
cotter pins of the same size. Strong pins may fail to shear,
causing more serious damage elsewhere. Weaker pins are
prone to nuisance shears. Refer to current Parts Manual for
correct spirol pin replacement part number.
Marker Maintenance (Option)
See also:
“Initial Marker Setup (Option)” on page 164,
“Marker Operation (Option) SN+” on page 43, and
“Marker Disk Adjustment” on page 53
Marker Shear Bolt Replacement
Refer to Figure 120
If a marker gets caught or hits an obstruction, it is
designed to fail a shear bolt
at the fold, pivot on a
second bolt (not visible in Figure), and swing back.
The shear bolt is a hex head cap screw,
5 ⁄
16
-18 x 1
1 ⁄
2
in
Grade 5, Great Plains part number 802-012C, plus a
5 ⁄
16
-18 lock nut, Great Plains part number 803-011C.
Note: If an exact replacement is not immediately
available, temporarily substitute an M8x1.25 Class
8.8 bolt and nut.
Install a replacement shear bolt on the vertical face 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 Grease Seal Cap
If grease seal cap for marker-disk-hub bearings is
damaged or missing, disassemble and clean hub.
Repack with grease and install new seal or grease cap.
Figure 119
Transmission Shear Pin
29884
2
1
3
1
2
2
1
1
2
3
Figure 120
Marker Shear Bolt (S/N-)
29982
3
Figure 121
Marker Shear Bolt (S/N+)
32048