MacDon FD75 OM - Manual (Page 301)

MAINTENANCE AND SERVICING
5. Loosen two nuts (B).
6. Set clearance (C) to 3/16–3/8 in. (5–10 mm) with
adjuster bolt (A). Clockwise to increase clearance,
counter-clockwise to decrease.
NOTE:
The clearance increases to 1–1-1/2 in. (25–40
mm) when the center-link fully retracts for a flatter
header angle.
7. Repeat above two steps for other end of auger.
8. Tighten nuts (B) on both ends of auger.
Figure 6.61: Auger Clearance
6.7.2 Adjusting Auger Drive Chain Tension
The auger is chain-driven from the adapter drive system by a sprocket that is attached to side of the auger.
To adjust chain slack, follow these steps.
CAUTION
Stop engine and remove key from ignition before leaving operator's seat for any reason. A child or even a
pet could engage an idling machine.
1. Detach header from combine. For instructions, refer to
5 Header Attachment/Detachment, page 189 .
2. Remove the six bolts (A) that secure the top cover on
the auger chain case.
3. Remove the three bolts (B) and loosen two bolts (E)
that secure the bottom cover.
4. Remove cover retainer (F).
5. Rotate covers (C) and (D) forward to remove.
Figure 6.62: Auger Drive
169894 287 Revision A