MacDon M2170 Operator's Manual page 246

3. Lift header support (A), and place four 35 x 89 mm
(2 x 4 in.) blocks (B) under both header supports. Ensure
that the boot's bottom edge (C) is parallel with the ground.
NOTE:
Do NOT stack blocks (B) crosswise; doing so can make the
header unstable when you are attempting to connect the
header and the windrower. Stack blocks (B) so that they are
aligned with each other.
4. Start the engine.
262170
OPERATION
A
B
Figure 4.212: Header Support
222
C
Revision A