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FD1 Series / FM100 Quick Card – MD #214567 Revision A 

Supplement to FD1 Series Combine Header Operator’s Manual 

FD1 Series / FM100 Quick Card – MD #214567 Revision A 

Supplement to FD1 Series Combine Header Operator’s Manual 

1.  Before adjusting the float spring adjustment bolts (A), rotate the spring 

locks (B) by loosening bolts (C). 

2. To 

increase 

float (decrease header weight), turn both adjustment 

bolts (A) on the left side clockwise. Repeat adjustment at opposite side. 

3. To 

decrease 

float (increase header weight), turn left side adjustment 

bolts (A) counterclockwise. Repeat at opposite side. 

IMPORTANT:

 

Ensure torque wrench indicator readings are equal on both sides of 

float module. 

NOTE:

 

For 12.2 and 13.7 m (40 and 45 ft.) double-knife headers, adjust float 

as above, then loosen right side float spring bolts two turns. 

NOTE:

 

If adequate header float cannot be achieved using all the available 

adjustments, an optional heavy duty spring is available. See your 

MacDon Dealer or refer to the parts catalog for ordering information. 

Step 4: Setting Header Float 

FD1 Series / FM100 Recommended Settings

 

FD1 Series Draper Header / FM100 Float Module Quick Card 

Subject to change without notice

 

1.  Place torque wrench (A) onto float lock (B). Note the change in wrench 

orientation when checking float module’s left and right side. 

2.  Push down on torque wrench (A) to rotate bell crank (C) forward. 
3.  Continue pushing down on torque wrench until the wrench’s 

indicator (D) reaches a maximum reading and begins to decrease. Note 

the maximum reading. 

4.  Repeat above steps for opposite side of float module. 
5.  Refer to Table 1.1 as a guide for float settings. 

• 

If the reading is high, the header is heavy. 

• 

If the reading is low, the header is light. 

Step 3: Checking Header Float 

Header Size  

m (ft.)

 

Indicator Reading

 

Cutting on 

the Ground

 

Cutting off 

the Ground

 

9.1 and 10.6 m 

(30 and 35 ft.) 

1-1/2 to 2 

2 to 2-1/2 

12.1 and 13.7 m 

(40 and 45 ft.) 

2 to 2-1/2 

2-1/2 to 3 

Table 1.1: Float Settings 

Delta Rice 

So

ybeans

 

Peas 

Lentils 

Figure 7: Float Adjustment Bolts – Left Side Shown 

Figure 6: Checking Float – Left Side Shown 

Figure 5: Checking Float – Right Side Shown 

IMPORTANT:

 

Torque settings in Table 1.1: Float Settings are recommended header 

float settings. It may be necessary to set float values outside of these 

ranges to suit varying crop and field conditions. 

1.  Remove wing balance linkage cover on left side of the float module by 

removing securing bolt and rotating the cover upwards until the inboard 

end can be lifted off. 

2.  Place wing lock spring handles in the unlocked (lower) position. 

3.  Place torque wrench (A) on bolt (B). 

4.  Check that pointer (C) is properly positioned as follows: 

a.  Use the torque wrench (A) to move the bell crank so that the bell 

crank’s lower edge (D) is parallel to the top-link’s lower edge (E). 

b.  Ensure pointer (C) is lined up with the top-link (E). If necessary, 

bend the pointer it aligns with bolt hole (J). 

5.  Move wing upward with torque wrench (A) until the pointer’s lower 

alignment tab (F) lines up with the upper edge of the top-link (E). Refer 

to Figure 8. Observe the indicator reading (G) on the torque wrench and 

record it. 

6.  Move the wing downward with torque wrench (A) until the pointer’s 

upper alignment tab (H) lines up with the lower edge of the top-link (E). 

Refer to Figure 9. Observe the indicator reading (G) on the torque 

wrench and record it. 

7.  Check wing balance on opposite side of header. 

• 

If the difference between the readings is 0.5 or less, the wing is 

balanced and adjustment is not required. 

• 

If the difference between the readings is more than 0.5, the wing is 

not balanced and adjustment is required. 

Step 5: Check Wing Balance 

1.  Place torque wrench (A) on bolt (B) on the left side of header. 

2.  Loosen clevis bolt (C) and jam nut (J). 

3.  Recheck wing balance. Refer to 

Step 5: Check Wing Balance

4.  If necessary, make the following adjustments: 

• 

If the wing is too heavy, turn the clevis adjuster bolt (D) to move 

clevis (E) outboard (F). 

• 

If the wing is too light, turn the clevis adjuster bolt (D) to move 

clevis (E) inboard (G). 

5.  Adjust clevis (E) position (if necessary) until the difference between 

torque wrench indicator readings is 0.5 or less. Tighten clevis bolt (C) 

and jam nut (J). 

6.  Place wing lock spring handles (H) in the locked (upper) position. If lock 

doesn’t engage, move the wing up and down with the torque wrench (A) 

until it locks. When locked, there will be some movement in the linkage. 

Repeat on opposite side of header. 

7.  If the cutterbar is not straight when wings are in lock mode, then further 

adjustments are required. Contact your MacDon Dealer. 

8.  Return the torque wrench (A) to its storage location on the float 

module frame. 

Step 6: Adjust Wing Balance 

IMPORTANT:

 

Before proceeding, the header float must be set properly. Refer to 

Step 4: Setting Header Float

Figure 8: Wing Balance Linkage,  

Wings Set too Light – Left Side Shown, Right Opposite 

Figure 10: Wing Balance Linkage – Left Side Shown 

Figure 9: Wing Balance Linkage,  

Wings Set too Heavy – Left Side Shown, Right Opposite 

FD1 Series / FM100 Quick Card – MD #214567 Revision A 

Supplement to FD1 Series Combine Header Operator’s Manual 

FD1 Series / FM100 Quick Card – MD #214567 Revision A 

Supplement to FD1 Series Combine Header Operator’s Manual 

1.  Before adjusting the float spring adjustment bolts (A), rotate the spring 

locks (B) by loosening bolts (C). 

2. To 

increase 

float (decrease header weight), turn both adjustment 

bolts (A) on the left side clockwise. Repeat adjustment at opposite side. 

3. To 

decrease 

float (increase header weight), turn left side adjustment 

bolts (A) counterclockwise. Repeat at opposite side. 

IMPORTANT:

 

Ensure torque wrench indicator readings are equal on both sides of 

float module. 

NOTE:

 

For 12.2 and 13.7 m (40 and 45 ft.) double-knife headers, adjust float 

as above, then loosen right side float spring bolts two turns. 

NOTE:

 

If adequate header float cannot be achieved using all the available 

adjustments, an optional heavy duty spring is available. See your 

MacDon Dealer or refer to the parts catalog for ordering information. 

Step 4: Setting Header Float 

FD1 Series / FM100 Recommended Settings

 

FD1 Series Draper Header / FM100 Float Module Quick Card 

Subject to change without notice

 

1.  Place torque wrench (A) onto float lock (B). Note the change in wrench 

orientation when checking float module’s left and right side. 

2.  Push down on torque wrench (A) to rotate bell crank (C) forward. 
3.  Continue pushing down on torque wrench until the wrench’s 

indicator (D) reaches a maximum reading and begins to decrease. Note 

the maximum reading. 

4.  Repeat above steps for opposite side of float module. 
5.  Refer to Table 1.1 as a guide for float settings. 

• 

If the reading is high, the header is heavy. 

• 

If the reading is low, the header is light. 

Step 3: Checking Header Float 

Header Size  

m (ft.)

 

Indicator Reading

 

Cutting on 

the Ground

 

Cutting off 

the Ground

 

9.1 and 10.6 m 

(30 and 35 ft.) 

1-1/2 to 2 

2 to 2-1/2 

12.1 and 13.7 m 

(40 and 45 ft.) 

2 to 2-1/2 

2-1/2 to 3 

Table 1.1: Float Settings 

Delta Rice 

So

ybeans

 

Peas 

Lentils 

Figure 7: Float Adjustment Bolts – Left Side Shown 

Figure 6: Checking Float – Left Side Shown 

Figure 5: Checking Float – Right Side Shown 

IMPORTANT:

 

Torque settings in Table 1.1: Float Settings are recommended header 

float settings. It may be necessary to set float values outside of these 

ranges to suit varying crop and field conditions. 

1.  Remove wing balance linkage cover on left side of the float module by 

removing securing bolt and rotating the cover upwards until the inboard 

end can be lifted off. 

2.  Place wing lock spring handles in the unlocked (lower) position. 

3.  Place torque wrench (A) on bolt (B). 

4.  Check that pointer (C) is properly positioned as follows: 

a.  Use the torque wrench (A) to move the bell crank so that the bell 

crank’s lower edge (D) is parallel to the top-link’s lower edge (E). 

b.  Ensure pointer (C) is lined up with the top-link (E). If necessary, 

bend the pointer it aligns with bolt hole (J). 

5.  Move wing upward with torque wrench (A) until the pointer’s lower 

alignment tab (F) lines up with the upper edge of the top-link (E). Refer 

to Figure 8. Observe the indicator reading (G) on the torque wrench and 

record it. 

6.  Move the wing downward with torque wrench (A) until the pointer’s 

upper alignment tab (H) lines up with the lower edge of the top-link (E). 

Refer to Figure 9. Observe the indicator reading (G) on the torque 

wrench and record it. 

7.  Check wing balance on opposite side of header. 

• 

If the difference between the readings is 0.5 or less, the wing is 

balanced and adjustment is not required. 

• 

If the difference between the readings is more than 0.5, the wing is 

not balanced and adjustment is required. 

Step 5: Check Wing Balance 

1.  Place torque wrench (A) on bolt (B) on the left side of header. 

2.  Loosen clevis bolt (C) and jam nut (J). 

3.  Recheck wing balance. Refer to 

Step 5: Check Wing Balance

4.  If necessary, make the following adjustments: 

• 

If the wing is too heavy, turn the clevis adjuster bolt (D) to move 

clevis (E) outboard (F). 

• 

If the wing is too light, turn the clevis adjuster bolt (D) to move 

clevis (E) inboard (G). 

5.  Adjust clevis (E) position (if necessary) until the difference between 

torque wrench indicator readings is 0.5 or less. Tighten clevis bolt (C) 

and jam nut (J). 

6.  Place wing lock spring handles (H) in the locked (upper) position. If lock 

doesn’t engage, move the wing up and down with the torque wrench (A) 

until it locks. When locked, there will be some movement in the linkage. 

Repeat on opposite side of header. 

7.  If the cutterbar is not straight when wings are in lock mode, then further 

adjustments are required. Contact your MacDon Dealer. 

8.  Return the torque wrench (A) to its storage location on the float 

module frame. 

Step 6: Adjust Wing Balance 

IMPORTANT:

 

Before proceeding, the header float must be set properly. Refer to 

Step 4: Setting Header Float

Figure 8: Wing Balance Linkage,  

Wings Set too Light – Left Side Shown, Right Opposite 

Figure 10: Wing Balance Linkage – Left Side Shown 

Figure 9: Wing Balance Linkage,  

Wings Set too Heavy – Left Side Shown, Right Opposite 

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