Sickle Hold-Downs. MacDon D50 & D60

SECTION 8. MAINTENANCE AND SERVICING

Check daily that sickle hold-downs are set to prevent sickle sections from lifting off guards, but still permit sickle to slide without binding.

NOTE

Guards should be aligned prior to adjusting hold-downs.

c. After adjusting all hold-downs, run header at a low engine speed, and listen for noise due to insufficient clearance. Insufficient clearance will also result in overheating of the sickle and guards. Re-adjust as necessary. a. To adjust the clearance between the hold-down and sickle for all stub guards, proceed as follows:

F a. To adjust the clearance between the hold-down and sickle for typical pointed guards, proceed as follows:

A

E

B

0.004 - 0.024 in

(0.1 - 0.6 mm)

0.004 - 0.040 in

(0.1 - 1.0 mm)

0.004 - 0.016 in

(0.1 - 0.4 mm)

1. Using a feeler gauge, clearance from holddown to sickle section should be

0.004 - 0.024 in. (0.1 - 0.6 mm).

2. Turn adjuster bolts (A) as required.

NOTE

For larger adjustments, it may be necessary to loosen nuts (B), turn adjuster bolt (A), then re-tighten nuts

(B).

b. For center guard, proceed as follows:

1. Torque nuts (E) to 35 ft·lbf (46 N·m).

2. Using a feeler gauge, clearance from holddown to sickle section should be

0.004 - 0.016 in. (0.1 - 0.4 mm) at the guide tip, and 0.004 - 0.040 in. (0.1 - 1.0 mm) at rear of guide.

3. Turn adjuster bolts (F) as required.

4. Torque nuts (E) to 53 ft·lbf (72 N·m).

D

0.004 - 0.040 in

(0.1 - 1.0 mm)

C

0.004 - 0.016 in

(0.1 - 0.4 mm)

1. Torque nuts (C) to 35 ft·lbf (46 N·m).

2. Using a feeler gauge, clearance from holddown to sickle section should be

0.004 - 0.016 in. (0.1 - 0.4 mm) at the guide tip, and 0.004 - 0.040 in. (0.1 - 1.0 mm) at rear of guide.

3. Turn adjuster bolts (D) as required.

4. Torque nuts (C) to 53 ft·lbf (72 N·m).

Form 169441

99

Revision B