MacDon R1 Series Operator's Manual page 191

IMPORTANT:
Right discs (A) and left discs (B) are timed and must be installed at a 90° angle relative to the neighboring discs. Misaligned
discs could result in the following:
Disc blades of co-rotating discs hitting each other
Disc blades of diverging discs hitting adjacent discs
Inspect the disc timing using the disc timing tool before securing the spindle to the cutterbar. The disc is correctly timed if
the spindle hub is aligned with the disc timing tool as shown in Figure
the disc blades do NOT contact each other or those of adjacent discs. If the alignment is incorrect, lift the spindle clear of
the mounting bolts, rotate the spindle 180° while ensuring that the base does not turn, and reinstall the spindle. Recheck
the timing before securing the hub. Spindles do NOT need to be bolted to the disc timing tool; visual confirmation of the
alignment is sufficient.
NOTE:
Remove the shield and retrieve disc timing tools (A) from the left
rear side of the header.
NOTE:
Assemble disc timing tools (A) and (B) and secure them with M8
carriage head bolt (C), washer (D), and M8 flange hex nut (E).
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MAINTENANCE AND SERVICING
4.55, page
Figure 4.53: Disc Timing Tool Location – Left Rear Side
Figure 4.54: Disc Timing Tool
173
174. Turn the disc by hand to ensure that
A
A
C
D
E
B
Revision A