Remove and Install Stalk Rolls

1. CAUTION:

   
   H90471-UN-04JAN08

   A - Trash Knife

   B - Cap Screw and Washer (4 used)

   Completely raise corn head and engage feeder house safety stop before performing any work.

   Remove four cap screws (B), washers, and trash knife (A) from underside of row unit frame.

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2. NOTE: Stalk rolls will turn when attempting to remove nut (A). Place a pry bar between the stalk roll and row unit frame to prevent stalk rolls from turning.

   
   H90472-UN-04JAN08

   A - Nut

   Remove and discard nut (A).

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3. 
   H90473-UN-04JAN08

   A - Stalk Roll Rib (2 used)

   Stalk rolls can typically be pulled off by hand. If unable to do so locate the two ribs (A) on stalk roll. Remove stalk roll from shaft by attaching a 2-jaw puller to ribs.

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4. Shaft taper should be free of rust and dirt. Inspect stalk rolls for wear or damage.

5. IMPORTANT: Stalk roll spherical nut (A) contains a pre-applied thread locking patch (B) and cannot be reused. A replacement nut must be purchased from John Deere Service Parts.

   
   H90472-UN-04JAN08

   
   H90490-UN-04JAN08

   A - Spherical Nut

   B - Thread Locking Patch

   Align splines on stalk roll and shaft and install stalk roll.

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6. Install new spherical nut (A) and tighten to specification.

   Item	Measurement	Specification
   Stalk Roll Spherical Nut	Torque	400 N·m (295 lb.-ft.)

7. 
   H90471-UN-04JAN08

   A - Trash Knife

   B - Cap Screw and Washer (4 used)

   Install trash knife (A) using four washers and cap screws (B).

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8. Adjust trash knives (see ADJUSTING TRASH KNIVES in ADJUSTMENTS section).

9. Repeat procedure on opposite stalk roll.