Adjust Concave Level

CAUTION: Shut off engine, set parking brake and remove key.

1. Remove cap screw, lock nut and open side shield (A).

2. Remove cap screw, lock nut and remove shield (B) and (C).

A-Shield
B-Shield
C-Shield

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3. Remove separator inspection covers (A).

A-Separator Covers

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NOTE: Removing separator grate provides access for rotating rotor.

4. Remove cap screws (A) and separator grate (B).

A-Cap Screw (4 used)
B-Grate

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5. Back off stop bolt (A) and (B).

A-Stop Bolt
B-Stop Bolt

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6. Loosen jam nuts (A) and back off nuts (B) five turns each.

A-Bottom Nuts (2 used)
B-Top Nuts (2 used)

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7. Adjust concave all the way up using switch in cab until worm gear (B) and sector gear (A) are bottomed out in the up position.

A-Sector Gear
B-Worm Gear

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8. Shift STS Rotor drive gear case using handle (A) to neutral position (B).

A-Shift Handle
B-Neutral Position

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9. Adjust front eye bolt top nut (A) slowly until elements "tick" concave while rotor is rotating. Back off three complete turns.

10. Adjust rear eye bolt top nut (C) slowly, until elements "tick" concave while rotor is rotating. Back off three complete turns.

11. Adjust front eye bolt top nut (A) down slowly until elements "tick" concave. Back off slowly until "tick" stops. As soon as "tick" has stopped back off one complete turn and tighten top jam nut.

12. Adjust rear eye bolt top nut (C) down slowly, until elements "tick" concave. Back off slowly until "tick" stops. As soon as "tick" has stopped back off one complete turn and tighten top jam nut.

13. Tighten bottom front concave adjustment nut. Hold front eye bolt top nut (A) with open end wrench and tighten front eye bolt bottom jam nut (B).

14. Tighten bottom rear concave adjustment nut. Hold rear eye bolt top nut (C) with open end wrench and tighten rear eye bolt bottom jam nut (D).

A-Front Eye Bolt Top Nut
B-Front Eye Bolt Bottom Jam Nut
C-Rear Eye Bolt Top Nut
D-Rear Eye Bolt Bottom Jam Nut

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15. Adjust front and rear concave stop bolts (A) by tightening bottom nut (B) until head of bolt (C) is snug against concave. Tighten top nut (D) while holding bottom nut (B) with open end wrench.

A-Stop Bolts
B-Jam Nut
C-Head of Bolt
D-Jam Nut

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16. Install separator grate (B) and retain with cap screws (A).

17. Shift STS Rotor drive gear case to desired position.

18. Install separator inspection covers and shields.

19. Calibrate concave position in cab. (See Concave Sensor Zero Calibration).

A-Cap Screw (4 used)
B-Grate

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