Operating instructions

82 YP4-6-825A3P Table of Contents Index Great Plains Manufacturing, Inc.

401-652M Table of Contents Index 2015-01-26

Marker Maintenance (Option)

See also:

“Initial Marker Setup (Option)” on page 114,

“Marker Operation (Option) S/N-” on page 33, and

“Marker Disk Adjustment” on page 42

Marker Shear Bolt Replacement

Refer to Figure 90

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,

⁄

-18 × 1

⁄

inch Grade 5, Great Plains part number

802-012C, plus a

⁄

-18 lock nut, Great Plains part

number 803-011C.

Note: If an exact replacement is not immediately

available, temporarily substitute an M8 × 1.25

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 90

Marker Shear Bolt

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