Adjusting Rotary Knives

To keep a good shearing cut of rotary knives in all crop conditions, remove and clean them before making adjustments.

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1. Loosen nuts (A) on sprockets and adjustment bolt (B).

2. Remove connecting link (C) and drive chain (D).


A-Nuts
B-Adjustment Bolt
C-Connecting Link
D-Drive Chain

H63318
H63443

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3. Remove cotter pin (A)

4. Tighten slotted nut (B) until a slight drag or shearing action is felt as rotary knife is rotated across stationary knife.

5. Align slot in nut with first available hole in rotary knife and install cotter pin (A).


A-Cotter Pin
B-Slotted Nut

H63444

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6. Install chain (A) onto sprockets and retain with connecting link (B).


A-Connecting Link
B-Chain

H63318
H63451

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7. Tighten adjusting bolt (A) until specified force applied midway at (B) between sprockets (C) and (D) deflects chain to specification.

Specification

Sprockets -Force 90 N (20 lb)
Chain -Deflection 2-7 mm (3/32-9/32 in)

Torque nuts (E) to specification.

Specification

Nuts -Torque 115 N·m (85 lb-ft)

8. Run row crop header for a short time. Shut off engine, remove key and lower safety stop. Knife must be warm to the touch, never hot. Repeat adjustment as needed.

H63445


A-Adjusting Bolt
B-Midpoint
C-Sprockets
D-Sprockets
E-Nuts

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