MacDon FD75 OM - Manual (Page 179)

OPERATION
4.8 Leveling the Header
The adapter is factory-set to provide the proper level for the header, and should not normally require adjustment.
If the header is NOT level, perform the following checks prior to adjusting the levelling linkages:
• Check combine tire pressures.
• Check that the combine feeder house is level. Refer to your combine operator’s manual for instructions.
• Check that top of adapter is level and parallel with the feeder house.
NOTE:
The adapter float springs are not used to level the header.
To make fine adjustments to header levelling, follow
these steps:
1. Park combine on level ground.
2. Set header approximately 6 in. (150 mm) off ground,
and check that float linkage is against down stops.
Note high and low end of header.
3. Set wing float lock (A) to engaged. Refer to 6.14
Checking and Adjusting Header Wing Balance, page
390
. .
4. Check and set float adjustment. Refer to Checking and
Adjusting Header Float, page 138 .
Figure 4.251: Wing Lock
5. Adjust level with nut (A) at each float lock as follows.
Use small adjustments (1/4–1/2 turn), and adjust each
side equally but in opposite directions:
NOTE:
Setscrew (B) does not require loosening
for adjustments up to one-half turn of
nut (A).
a. Turn low-side nut clockwise to raise header.
b. Turn high-side nut counterclockwise to lower
header.
NOTE:
Adjustment of more than two turns in
either direction may adversely affect
header float.
Figure 4.252: Float Lock
169894 165 Revision A