Adjusting Doffer Column TiltNOTE: Radius and leaf gauges for PRO-12 units are available through your John Deere dealer. 1. Loosen four upper housing cap screws (A).
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2.
Remove two picker-bar-pivot-stud screws (A). Install radius gauge (B) (N274391) with offset portion down and part number on top side.
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3.
Hang N117835 gauge (A) 1.52 mm (0.60 in.) over top spindle.
4. Hang N273460 gauge (B) 2.29 mm (0.090 in.) over third spindle from bottom. 5. Loosen three adjusting plate cap screws (E). NOTE: Do not loosen bearing housing cap screws (D). 6. Rotate doffer column until gauges touch doffer. Position doffer against upper and lower gauges with radius gauge (C) (N274391) against lower bearing housing. 7. Tighten adjusting plate cap screws to specification. Specification
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8.
Tighten upper housing cap screws (A) to specification.
Specification
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9.
If doffer bearings bind after making previous adjustment, loosen top and/or bottom bearing cover flange cap screws (A) and shim any gap. Use N34164 shims (B) 0.254 mm (0.010 in.) at locations (C) as necessary.
10. Tighten all flange cap screws to specification. Specification
11. Check doffer height to see that pads "lightly touch" the spindles under the leading edge of the column. See ADJUSTING DOFFER HEIGHT-NORMAL CONDITIONS in this section.
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12.
Check doffer stub shaft run-out using a dial indicator. Maximum allowable run-out is 0.25 mm (0.010 in.).
Specification
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