MacDon CA25 OM - Manual (Page 137)

SECTION 8. MAINTENANCE AND SERVICING
169593
135
Revision B
8.9.7 Sickle Hold-Downs
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.
8.9.7.1 Pointed Guard Adjustment
a. To adjust the clearance between hold-down
and sickle for typical pointed guards:
1. Turn the adjuster bolts (A). Using a feeler
gauge, clearance from hold-down to sickle
section
should be 0.004–0.024 in.
(0.1–0.6 mm).
NOTE
For larger adjustments, it may be
necessary to loosen nuts (B), turn
adjuster bolt (A), then re-tighten nuts
(B).
b. To adjust clearance between hold-down and
sickle:
1. Torque nuts (C) to 35 ft·lbf (46 N·m).
2. Turn the adjuster bolts (D). Using a feeler
gauge, clearance from hold-down to sickle
section should be:
 0.004–0.016 in. (0.1–0.4 mm) at guide
tip, and
 0.004–0.040 in. (0.1–1.0 mm) at rear of
guide.
3. Torque nuts (C) to 53 ft·lbf (72 N·m).
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.
8.9.7.2 Stub Guard Adjustment
To adjust the clearance between the hold-down
and sickle for all stub guards:
a. Torque nuts (E) to 35 ft·lbf (46 N·m).
b. Turn the adjuster bolts (F). Using a feeler
gauge, clearance from hold-down to sickle
section should be:
 0.004–0.016 in. (0.1–0.4 mm) at guide tip,
and
 0.004–0.040 in. (0.1–1.0 mm) at rear of
guide.
c. Torque nuts (E) to 53 ft·lbf (72 N·m).
0.004 - 0.040 in
(0.1 - 1.0 mm)
0.004 - 0.016 in
(0.1 - 0.4 mm)
F
E
0.004 - 0.024 in
(0.1 - 0.6 mm)
B
A
0.004 - 0.016 in
(0.1 - 0.4 mm)
0.004 - 0.040 in
(0.1 - 1.0 mm)
D
C