MacDon HC10 for D-Series - Manual (Page 49)

UNLOADING AND ASSEMBLY
7. Remove L-pins securing lifting arms to conditioner.
(Rotate pins to align key-hole slot.)
Figure 3.28
8. Swing out lift arms and secure latches.
Figure 3.29
9. Position the tractor arms in the lift arm pockets, and
insert the L-pins (A) for safety.
Figure 3.30
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Rev. D