Adjust Concave Level

1. Remove shields and separator inspection covers as needed.

2. Back off stop bolts (A) and (B).

A-Stop Bolt
B-Stop Bolt

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

4. Close concave fully.

A-Jam Nut (2 used)
B-Nut (2 used)

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5. Check to see that stop (A) on concave adjusting tube is against stop cap screw (B).

A-Stop
B-Cap Screw

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6. Shift STS Rotor drive gear case shift handle (A) to neutral position (B).

A-Shift Handle
B-Neutral Position

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7. Back off lower nut on front and rear eyebolts.

NOTE: If nut on eyebolt is tightened five turns without contacting high element, top nut of rear eyebolt must be tightened five turns before proceeding with adjustment. If element contacts middle or rear concave section before front, loosen top nut of rear eyebolt and tighten bottom nut to provide clearance.

8. Rotate STS Rotor while tightening top nut (A) on front eyebolt until high element "ticks" front concave section. Back nut off one turn.

9. Rotate STS Rotor while tightening top nut of rear eyebolt (B) until high element "ticks" rear concave section. Back nut off one turn.

NOTE: Top nut on eyebolt can be adjusted one full turn for each millimeter out of level.

10. Tighten bottom nuts on front and rear eyebolts. Tighten all jam nuts.

A-Top Nut-Front Eyebolt
B-Top Nut-Rear Eyebolt

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NOTE: There should be approximately 2mm (3/32 in.) of clearance between the tight concave bar and the high threshing bar when the concaves are properly set and leveled.

11. Set stop bolts (A) by lowering until they contact plate (B) of concave hanger. Tighten nuts on stop bolts.

12. Install separator inspection covers and shields.

13. Place rotor drive gear case in desired speed range.

A-Stop Bolt (2 used)
B-Plate

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