MacDon 922 - Manual (Page 49)

Form # 46620 Issue 01/06 47
MAINTENANCE/SERVICE
SICKLE AND SICKLE DRIVE (continued)
Stub Guards and Hold-Downs – 933 Header
Stub guards are standard equipment on the 933
Grass Seed header, but may be installed on the
standard header as well. Kits are available for
conversion.
To adjust stub guard top guides:
1. Stroke sickle to center the sections on guard
points.
2. Using a feeler gauge at (H), back off adjusting
screws (F) as required to obtain .010 to .015
inch (.25 to .38 mm) clearance between hold-
down and sickle section at each guard point.
3. Tighten guard bolts (E).
4. Use bolt (G) as required to tilt nose of top
guide up or down.
5. Check for clearance between sickle head and
adjuster bar at first hold-down (both ends of
header). Check clearance at both extremities
of sickle stroke.
6. After adjusting all hold-downs, run header at a
low engine speed and listen for noise due to
insufficient hold-down clearance. Re-adjust as
necessary.
Check hold-down clearances daily. Adjust as
required, using screws (G).
Cast Hold-Downs (Optional)
Adjustable cast hold-downs are available for use
with standard guards.
To adjust cast hold-downs:
1. Loosen guard bolts.
2. Using a feeler gauge between hold-down and
sickle section, turn bolt (K) to obtain .020 inch
(0.5 mm) clearance.
3. Tighten guard bolts.
4. After adjusting all hold-downs, run header at a
low engine speed and listen for noise due to
insufficient hold-down clearance. Re-adjust as
necessary.
STUB GUARDS AND HOLD-DOWNS
933 HEADER
ADJUSTING CAST HOLD-DOWNS
K