OMHXE13769: 9670 STS and 9770 STS Combines 9670 STS 735201 9770 STS 735301 , Block File: OUO6075_000074C_19

Concave Sections-Remove and Install

NOTE: For ease of removal, close concave completely.

1. Move handle (A) to shift rotor gearcase in neutral position (B).

A-Handle
B-Neutral Position

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2. Remove quick-lock pins and open side shield (A).

3. Remove quick-lock pins and shields (B and C).

A-Shield
B-Shield
C-Shield

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4. Remove separator inspection covers (A).

5. Inspect wear on concave sections using AH204933 Clearance Gauge.

A-Separator Cover

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NOTE: Removing separator grate provides access for rotating rotor for maximum concave to threshing element clearance.

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

A-Cap Screws
B-Separator Grate

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7. Loosen cap screws (A) and remove left-hand sheet metal diverter (B).

A-Cap Screws
B-Diverter

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8. Place a piece of cardboard (A) or poly over conveyor augers. This provides protection for the augers and allows a smooth surface to remove the concaves.

A-Cardboard

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9. Remove quick-lock pins and shields (A).

A-Shields

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10. Remove quick-lock pins and front two separator covers (A) on right-hand side of machine.

A-Separator Cover

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11. Remove spring lock pin (A) from concave retainer (B).

12. Lift concave retainer and remove handle from each concave section.

A-Spring Pin
B-Concave Retainer

Concave Retainer

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13. Loosen cap screws (A).

14. Fully open concave. This allows weight of concaves to rest on conveyor auger bed.

A-Cap Screws (12 Used)

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15. Remove cap screws (A).

16. Remove cotter pins, pins (B) and "Z" bar (C).

17. Rotate rotor such that a gap in the threshing element pattern occurs at mid concave.

18. Remove center concave section.

19. Slide rear concave to the center position and remove.

20. Slide front concave to the center position and remove.

21. Install concaves in reverse order.

A-Cap Screws (12 Used)
B-Pins
C-"Z" Bar

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22. Install concave handle (A) into groove (B) on concave sections.

23. Install concave retainer (C) and retain with spring pin (D).

A-Handle
B-Groove
C-Concave Retainer
D-Spring Pin

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24. Position "Z" bar (C) over end of concaves and install cap screws, but do not tighten.

25. Install pins (B).

26. Fully close concave.

A-Cap Screws (12 Used)
B-Pins
C-"Z" Bar

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27. Be sure the ends of concaves fit snug into "Z" bar; then tighten top row of cap screws (A) first.

28. Tighten bottom row of cap screws last.

29. Adjust concave level. (See Concave Leveling later in this section.)

A-Cap Screws

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NOTE: Make sure top edge of separator cover is under clips.

30. Install separator covers (A).

A-Separator Covers

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31. Install shields (A).

A-Shields

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

A-Cap Screws
B-Separator Grate

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33. Remove cardboard (A) or poly from conveyor augers.

A-Cardboard

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34. Install diverter (B) to original position and tighten cap screws (A).

A-Cap Screws
B-Diverter

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35. Install separator inspection covers (A).

A-Separator Cover

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36. Install shields (B and C).

37. Close side shield (A).

38. Place rotor drive gearcase in desired speed range.

A-Shield
B-Shield
C-Shield

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