MacDon R85 Rotary Disc 16 Foot Self-Propelled Windrower Headers - Manual (Page 35)

OPERATION
4. To disengage safety props, turn lever (A) away from
header to raise safety prop until lever locks into vertical
position. Repeat for opposite cylinder.
Figure 5.4
5. Start engine, choose a level area, and lower header to
the ground. Stop engine and remove key.
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Rev. F